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REVIEW article

Front. Bioeng. Biotechnol., 24 May 2024
Sec. Organoids and Organ-On-A-Chip

Progress and application of lung-on-a-chip for lung cancer

Lantao Li&#x;Lantao Li1Wentao Bo&#x;Wentao Bo2Guangyan Wang&#x;Guangyan Wang3Xin JuanXin Juan4Haiyi Xue
Haiyi Xue5*Hongwei Zhang
Hongwei Zhang1*
  • 1Department of Anesthesiology, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital and Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
  • 2Department of Hepatopancreatobiliary Surgery, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital and Institute, Sichuan Cancer Center, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
  • 3Department of General Internal Medicine, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital and Institute, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China
  • 4Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
  • 5Department of Intensive Care Unit, Sichuan Clinical Research Center for Cancer, Sichuan Cancer Hospital and Institute, Affiliated Cancer Hospital of University of Electronic Science and Technology of China, Chengdu, China

Lung cancer is a malignant tumour with the highest incidence and mortality worldwide. Clinically effective therapy strategies are underutilized owing to the lack of efficient models for evaluating drug response. One of the main reasons for failure of anticancer drug therapy is development of drug resistance. Anticancer drugs face severe challenges such as poor biodistribution, restricted solubility, inadequate absorption, and drug accumulation. In recent years, “organ-on-a-chip” platforms, which can directly regulate the microenvironment of biomechanics, biochemistry and pathophysiology, have been developed rapidly and have shown great potential in clinical drug research. Lung-on-a-chip (LOC) is a new 3D model of bionic lungs with physiological functions created by micromachining technology on microfluidic chips. This approach may be able to partially replace animal and 2D cell culture models. To overcome drug resistance, LOC realizes personalized prediction of drug response by simulating the lung-related microenvironment in vitro, significantly enhancing therapeutic effectiveness, bioavailability, and pharmacokinetics while minimizing side effects. In this review, we present an overview of recent advances in the preparation of LOC and contrast it with earlier in vitro models. Finally, we describe recent advances in LOC. The combination of this technology with nanomedicine will provide an accurate and reliable treatment for preclinical evaluation.

1 Introduction

Lung cancer, a global issue of widespread concern, has become a persistent public health challenge worldwide. More than 350 people die from lung cancer every day, which is the second leading cause of cancer death globally (Siegel et al., 2022). Based on population growth and ageing, the burden of cancer is expected to increase yearly. Current treatment modalities for lung cancer mainly include surgical resection, radiation, chemotherapy (Qin et al., 2018), and immunotherapy (Zhao and Cao, 2019). Chemotherapy, as an essential part of cancer treatment, is frequently constrained by drug solubility, poor distribution, low specificity, and a variety of side effects (Miller et al., 2019; Atmaca et al., 2022). Anti-tumour therapy becomes more challenging as tumour resistance rates climb. Anti-tumour drugs are frequently successful in the early stages of cancer, but after tumour recurrence, patients often develop variable degrees of resistance (Wang N. et al., 2023). Currently, the advent of targeted drugs can decrease the side effects of drugs, but they also face the problem of drug resistance, which may lead to tumour exacerbation (Zheng et al., 2019). In recent decades, the area of bio-nanoscience and cancer medicine has developed rapidly (Bjornmalm et al., 2017). Despite significant advances in some new therapeutic strategies, such as use of nanodrug delivery systems (NDDSs) (Briolay et al., 2021), clinical translation rates are low owing to the lack of efficient models in vitro for evaluating whole-body responses. The advent of microfluidic tumour-on-chip (TOC)-based systems offers a new approach to these challenges (Tian et al., 2022). Microfluidic devices offer a substantial reduction in reagent consumption, chemical reaction durations, and overall costs through integration on a single chip. This advancement holds the potential to facilitate innovative point-of-care (POC) and point-of-need solutions for clinical diagnostics (Gurkan et al., 2024).

Animal models and cancer cell lines are currently used to investigate the majority of anticancer drugs, which can provide cell-type specific mechanistic information. However, the lung is a complex organ with the specific internal environment and architecture, including alveolar-capillary barrier, extracellular matrix (ECM) and multi-organs interactions. These models have poor predictive performance for the key features to lung because it is difficult to replicate biological functions (Vlachogiannis et al., 2018), which contributes to high failure rates in new drug development (Ainslie et al., 2019; Dowden and Munro, 2019; Gao et al., 2022). The majority of experimental in vitro cell culture models are relatively simple. These two-dimensional models focus on understanding the molecular mechanisms of cell biology rather than integrated, complex physiological function (Kapalczynska et al., 2018). To overcome these difficulties, it is necessary to develop accurate and highly efficient modules for evaluation of anticancer drugs. In recent decades, microfluidics is an emerging tool to perform analyses with high sensitivity, speed, throughput, and low cost (Ren et al., 2013). Microfluidic organ chips, a multidisciplinary cross-product, have become one of the most valuable animal-replacement models based on such advantages as highly simulating the microenvironment in vivo and convenient measurement of physiological parameters (Huh et al., 2010; Benam et al., 2016). These microfluidic organ chips can reconstruct the pathophysiological features of tumours at the microscale level in vitro, such as the tumour microenvironment, three-dimensional tissue structure, and dynamic culture conditions, in which different types of cells are cultured on a chip according to tissue-specific three-dimensional space to simulate a specific organ or system (Baptista et al., 2022; Ingber, 2022). Briefly, the LOC contains a porous membrane and microfluidic channel system. A fluid control system that controls the fluids loading and perfusion can be connected to LOC to obtain an appropriate fluid flow to mimic the microenvironment (Figure 1A). The advent of LOC provides a powerful platform for real-time assessment of the effectiveness of drugs used in lung cancer treatment. This platform is a fast-expanding field in diagnostic, therapeutic applications, biotechnology, and drug toxicity test (Figure 1B). It enables personalized treatment of various diseases by providing efficient biological sample preparation, evaluation, and controlled distribution procedures.

Figure 1
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Figure 1. (A) Establishment of LOC. Reproduced with permission from Yang et al. (2023) Copyright 2023, Elsevier. (B) Application of LOC in the field of biomedicine.

2 Advances and challenges in the treatment of lung cancer

As the incidence of lung cancer has remained high worldwide, discovering new treatment strategies to effectively decrease the incidence and mortality of lung cancer is one of the most important tasks today (Barta et al., 2019). The development of lung cancer is a multifaceted process involving aspects such as angiogenesis, circulation, and the establishment of a tumor lesion (Inamura and Ishikawa, 2010). Lung cancer when detected are most often in a metastatic stage IV. Despite the abundance of current treatment options, the prognosis for patients remains poor (Halliday et al., 2019; Sepesi et al., 2020; Parums, 2022). For surgically resected lung cancer, careful evaluation reveals that in low-stage tumors, the neoplasm often invades surrounding tissues, leading to an increased recurrence rate and shortened patient survival (Gabor et al., 2004). In most cases, chemotherapy remains the crucial clinical strategy for the disease. However, drug resistance and drug-induced toxicity significantly hinder the effectiveness of chemotherapy (Califano et al., 2012). Currently, research on specific genes and regulatory molecules is increasing, with various targeted drugs being introduced as well (Ye et al., 2021). How to individualize and make drug administration more precise, as well as how to reduce the development of drug resistance and toxicity after use are crucial factors to address (Liu et al., 2019). In recent years, sophisticated biotechnologies and interdisciplinary integration have provided innovative approaches for the treatment of lung cancer. In the advancement of lung cancer research, LOC models has played a significant role (Table 1).

Table 1
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Table 1. Lung cancer studied using LOC.

3 LOC platforms for preclinical study

In vitro models are the basis for clinical medicine and pharmacological research. Microfluidic and microfabrication technologies have led to rapid developments in the study of various in vitro models (Nikolic et al., 2018; Kohl et al., 2021). However, the majority of the current in vivo and in vitro models have many limitations, including not only differences in histiocyte physiology between animals and humans but also ethical issues of histiocyte acquisition, which makes it challenging to translate data from biological models to humans and to accurately predict human responses to drugs (Hachey and Hughes, 2018). In contrast to standard cell cultures, microfluidic chip technology, integrates the basic operation units of model preparation, reaction, separation, and detection onto a chip to perform various functions of a biological or chemical laboratory. Recently, developments in microfluidics, particularly organic microarrays, have provided powerful tools for dynamic drug activity evaluation and real-time systemic responses (Sontheimer-Phelps et al., 2019; Ingber, 2022; Tian et al., 2022).

An organ-on-a-chip is usually a microfluidic device for cell culture that comprises continuously perfused chambers populated by living cells organized to recapitulate the physiological functions of tissues. LOC was one of the first organs-on-a-chip developed, not only for modelling and drug evaluation of diseases such as pulmonary oedema, pulmonary thrombosis and lung tumours (Huh et al., 2012; Hassell et al., 2018; Jain et al., 2018; Yang et al., 2018) but also for lung diseases caused by viral infections (Ran et al., 2019; Deinhardt-Emmer et al., 2020). Huh et al. first proposed and revealed that cyclic mechanical strain exacerbates the toxic and inflammatory response of the lung to silica nanoparticles. This LOC can accurately mimic interactions between different tissues of the lung and reproduce relevant physiological functions of the lung at the alveolar level (Huh et al., 2010). The advent of LOC eliminates the disadvantage that animal models and 2D cell culture models cannot replicate the results observed in vivo (Francis et al., 2022). The comparison between the LOC and other existing models is illustrated (Figure 2).

Figure 2
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Figure 2. Comparison of different in vitro and in vivo models and their advantages and disadvantages.

3.1 Previous models and their limitations

3.1.1 Advantages and disadvantages of animal models

Animal models are widely used for studying respiratory disease pathophysiology, sequencing the cancer genome, searching for drug targets and toxicological research. But, analyses of drug pharmacokinetics (PKs) and pharmacodynamics (PDs) performed in animals are often not predictive of drug PKs and PDs in humans (Herland et al., 2020). Currently, more complex somatic mouse models of NSCLC (Marcazzan et al., 2021; Tien et al., 2021; Chen et al., 2022) and SCLC (Gonzales et al., 2018) have been produced that can highly mimic human lung cancer, which is crucial for the study of tumour drug resistance. However, animal models are not truly representative of human physiology, pathology and genetic characteristics and therefore cannot accurately predict how a drug will respond in the human body (Ahadian et al., 2018). For example, there is a significant difference in the timing of lung development occurring between mice and humans. This different pace of lung development leads to a greater sophistication of bronchial tree branch development in humans (Metzger et al., 2008). Additionally, animal models often face many ethical issues (Liguori et al., 2017). Therefore, more accurate preclinical models for disease modelling and drug testing are needed to improve the success of new drug development and bring them to market.

3.1.2 Advantages and disadvantages of 2D cell culture

2D cell culture models are still dominating preclinical evaluation of drug candidates due to their low manufacturing cost and high throughput for many biological studies (Ahadian et al., 2018; Tan C. L. et al., 2022). These models can provide a controlled and simplified environment to observe and examine cellular responses to potential therapeutic agents. Currently, in most research laboratories, the efficacy and cytotoxicity of medicines are mostly dependent on 2D cell culture systems, as this is the most convenient and low-cost method (Goodman et al., 2008). However, the main limitation of 2D cell models is that they usually consist of a single cell type and some complementary cells. These models do not replicate the complex structure and function of cells in human tissue (Jensen and Teng, 2020). Moreover, the single-culture mode can affect some physiological functions, such as cell histological morphology, cell division pattern, cell secretion, and gene expression (Kilian et al., 2010). In addition, when grown in 2D cultures, intracellular signalling pathways, for example, associated to cell proliferation, are affected by loss of cell polarity (Birgersdotter et al., 2005).

3.1.3 Advantages and disadvantages of 3D cell culture/organoids

Compared to traditional 2D monolayer cultures of cells, the 3D structure of solid tumours may lead to different growth profiles and drug responses (Katt et al., 2016). 3D models for drug screening pay more attention to differences in cell shape, density and drug sensitivity (Le et al., 2016). Additionally, novel 3D cell-cultivation models encapsulate cancer biology in the microenvironment, which is a major breakthrough compared to 2D culture systems. 3D cell culture models provide a highly predictive system for precision medicine, drug screening and preclinical research (Alemany-Ribes and Semino, 2014).

Currently available 3D cancer cell models can be classified as scaffold-free spheroid 3D models, scaffold-embedded cell 3D models and microfluidics platform models (Van Zundert et al., 2020). One of the most widely used scaffold-free 3D models is the multicellular tumour sphere (MCTS) model. MCTSs can be formed by proliferation of individual cells into cell aggregates or by further proliferation of preaggregated cell clusters (Baraniak and McDevitt, 2012). 3D single-cell models can well simulate tumour morphology, function, and microhabitat in vivo (Liao et al., 2019). For embedded models, there are usually two categories: natural and synthetic. The most commonly used natural scaffolds are composed of collagen, elastin, gelatine, and hyaluronic acid polymer matrix or substrate (Hughes et al., 2010). This model is more similar to the microenvironment but still has the disadvantages of no perfusion, no stress, and limited vasculature. The other natural scaffold construct is taken from mouse sarcoma cells and closely resembles the physiological extracellular matrix (ECM), containing a mixture of ECM proteins, including collagen, fibronectin and laminin. With development of microfluidics platforms, microfluidic technology that allows fluids to pass through the system to deliver nutrients and remove cellular waste by pump or gravity has been used in a preclinical model (Low and Tagle, 2017). This technique allows for a good representation of the spatial structure and distribution within tumour cells, which can reveal the process of proliferation, migration and invasion of tumour cells and their interactions with each other (Holton et al., 2017). However, low spheroid quantities, difficulty in renewing the culture medium, high cost, and the need for large initial volumes and long periods of time for cancer cell growth limit its widespread use (Sachs et al., 2018; Vlachogiannis et al., 2018; Zhang et al., 2018). A previous study showed that spheroids composed of patient-derived tumour cells could maintain tumour biology in vitro for a long period of time (Song et al., 2018). All these results suggest that spheroid culture has important applications in the screening of new anticancer drugs. However, in vitro cell culture studies are limited and do not fully mimic the more complex in vivo tumorigenesis and drug response to tumour therapy.

3.2 Several LOC models prepared using different technologies

3.2.1 Characteristics of LOC manufactured using lithography-based microfabrication techniques

Huh et al. (2010) designed a polymer polydimethylsiloxane (PDMS) chip via soft lithography-based microfabrication techniques (Figure 3B). This model was fabricated by microfabricating a microfluidic system containing two closely arrayed microchannels separated by a thin (10 µm) porous flexible membrane of PDMS. The porous membrane was coated with ECM (fibronectin or collagen), and cultured human alveolar epithelial cells and human pulmonary microvascular endothelium were placed on opposite sides. Once alveolar cell growth in the epithelial compartment of the porous membrane formed tightly connected junctions, the epithelial compartment media were aspirated to create an air-fluid interface. The flow of the culture medium in the endothelial compartment was maintained. By varying the pressure in the vacuum cavity on both sides of the chip, the membrane was deformed in a regular elastic manner to simulate breathing movements (Figure 3A). Though beneficial for drug and toxicity testing, the device cannot completely replicate organ-level lung functions. Sellgren et al. (2014) designed a new LOC model of a dual-membrane integrated microfluidic device based on previous microarrays. A microfluidic model of three vertically stacked chambers separated by a PDMS porous membrane was developed to simulate the microstructure of the airway mucosa. The airway microstructural properties were well simulated through three interfaces: the air-liquid interface, lung fibroblasts and microvascular endothelial cells. This LOC demonstrates that a microfluidic chip can support culture of primary airway epithelial cells and illustrates a co-culture approach enabling heterotypic cell interaction while maintaining compartmentalization.

Figure 3
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Figure 3. (A) A schematic diagram of the principle. (B) Respiratory membrane structures designed using three different technologies.

3.2.2 Characteristics of LOC manufactured using thermoplastic techniques

Humayun et al. (2018) developed a plastic airway-on-a-chip airway device using micromilling and solvent bonding to create a thermoplastic-based LOC model by using suspension hydrogels instead of PDMS to separate the upper and lower microchannels (Figure 3B). The chip contained an epithelial cell (EC) layer, a suspended hydrogel layer and a smooth muscle cell (SMC) layer, and all three microchannels were stacked vertically on top of each other. Unique to the design is that the upper and lower interfaces of the suspension hydrogel are used for EC and SMC cultures, respectively, and that the hydrogel can be extracted for further study, helping to investigate interactions between ECs, SMCs and the cell matrix in the development of lung cancer.

3.2.3 Characteristics of LOC manufactured using 3D cell bioprinting

The assistance of 3D bioprinting in tissue modeling and the fabrication of organ-like structures has fostered the development of LOC, with a wide range of applications, including personalized medicine, drug delivery, therapeutics, and many more. Park et al. (2018) constructed an alveolar-capillary interface in the human lung, and an LOC chip with two opposing microchannels was developed using 3D cell bioprinting technology containing a vascular network (Figure 3B). To simulate an airway microenvironment with functional capillaries, decellularized ECM (d-ECM) isolated from various organs/tissues was used as a bioink. A vascular platform (VP) was developed by direct 3D printing of cell-loaded d-ECM bioinks. The chip has a central reservoir for EC bioink and two reservoirs for lung fibroblast (LF) bioink on each side to regulate medium flow. This LOC, manufactured by 3D cell printing technology, allowed for independent control and variation in the precision of the parameters and efficient integration with the vascular network platform to reproduce the structural function of the organ.

4 Progress in LOC in lung cancer

Drug resistance has always been a major obstacle in treatment of lung cancer (Shanker et al., 2010; Lim and Ma, 2019), and previously introduced models do not fully show the complexity of the tumour microenvironment. Organ-on-a-chip is able to simulate the in vivo tumour biology environment effectively and therefore has received increasing attention from scholars and inspired them to conduct in-depth research (Nawroth et al., 2019; Guzzeloni et al., 2022). The LOC model allows for studying drug resistance in the context of the lung microenvironment, including effects of factors such as fluid flow, oxygen concentration, and cell‒cell interactions. One of the key advantages of LOC technology is its ability to accurately replicate the in vivo lung environment, which can lead to highly accurate and reliable results. The chip also provides the ability to rapidly screen drugs and evaluate their effectiveness in a high-throughput manner, making it a valuable tool for drug discovery and development.

4.1 The tumour microenvironment for drug resistance mechanism

The tumour microenvironment (TME) is not recapitulated in previous models used in cancer investigation, limiting the translation of preliminary findings to clinical practice. The TME is a complex and diverse multicellular environment. It is usually composed of immune cells, endothelial cells, ECM and other secreted molecules, such as growth factors and cytokines, as well as blood and lymphatic vessels, which are collectively enmeshed with each other and with the heterogeneous cancer cells (Bejarano et al., 2021; Wu et al., 2021; de Visser and Joyce, 2023). Tumour tissues usually have specific microenvironments that differ from normal tissues, such as acidity, hypoxia, and enzyme overexpression (Shrivastava et al., 2004). Additionally, tumour cells can affect the immune system by producing immunosuppressive TME, promoting immune evasion and ultimately leading to drug resistance. Decreased immunity of the body to tumour cells leads to immune editing to produce a microenvironment that promotes tumour growth, such as increased tumour-associated macrophages (TAMs) and regulatory T cells, decreased absolute counts of lymphocytes, and apoptosis of cytotoxic T cells (Anichini et al., 2020; Kunimasa and Goto, 2020; Zhang et al., 2022).

However, the TME involves not only tumorigenesis, metabolism and metastasis but also highly structured spatial structures and the relationship between cancer cells and surrounding nonmalignant cells (Wlodkowic and Cooper, 2010). This interaction between cells affects stromal development and ultimately the efficacy and efflux of anticancer drugs (Lai Benjamin et al., 2020). LOC can reconstruct artificial airways on a chip to precisely control drug diffusion rates, fluid shear stress, and even microscale cellular niches (Walsh et al., 2009). It serves as a novel 3D microfluidic culture platform that reconstructs the connection between tumour cells and surrounding tissue cells and mimics the physiological structure of normal human lung tissue. Lai et al. (2020) designed a model that can remodel tumour stiffness through myofibroblast contraction and collagen deposition. This study illustrated that the efficacy of antitumour drugs is affected when the TME changes. Therefore, the structural organization of tumour cells within tumour tissue determines how these cells function and interact in their surrounding environment. Xu et al. (2013) constructed a three-dimensional coculture drug sensitivity assay chip based on microfluidic technology. The sensitivity of antitumour drugs was detected by reconstructing the in vivo tumour microenvironment. The drug concentration that was most sensitive to tumour cells was screened according to the concentration gradient generator (CGG) within the chip to guide individualized treatment of lung cancer. In addition, Russell Jenkins and others adapted a 3D microfluidic device to culture patient-derived organotypic tumor spheroids, preserving the immune architecture of the tumor microenvironment, and enabling real-time analysis (Jenkins et al., 2018). This ex vivo system accelerates the identification of novel predictive and/or prognostic biomarkers, contributing to precise treatment of tumors. Recently, Benam et al. (Vo et al., 2024) constructed user-controlled long rounded EMC embedded vascular microlumens on-chip, demonstrating the significant influence of microchannel cross-sectional geometry and length on the uniform distribution and magnitude of shear stress on the vascular wall. These advantages render LOC particularly useful in various applications including disease modeling.

4.2 High-throughput analysis and deep learning on chips

The high-throughput and deep learning technology evaluation function of the LOC model also provide great convenience for development and screening of novel antitumour drugs in disease models (Ko et al., 2018; Kim et al., 2022). Microfluidic technology allows for precise and efficient adjustment of a device measuring a few square centimetres (or smaller), optimizing conventional chemical and biological laboratory operations, simplifying experimental procedures, and saving time and labour costs. This may greatly promote development of drug research (Azizgolshani et al., 2021). The integration of multiple devices into a single platform, especially in cancer and metastatic studies for various analyses, results in a high throughput system that generates amounts of intricately intertwined data (Oliver et al., 2019). Sebastiaan et al. (Trietsch et al., 2017) conducted an experiment with a gut-on-a-chip containing 357 gut tubes, generating 20,000 data points, which represents the largest published Organ-on-a-Chip dataset to date. Deep learning involves a range of computational methods extensively employed across various domains to reduce large numbers of measurements into lower-dimensional outputs that are more useful (Kourou et al., 2015). Furthermore, the applications of deep learning in microfluidic chips have allowed researchers to observe phenomena that were difficult to capture in the past. Singh et al. (2017) using the aforementioned approach to identify each cell flowing through the microchannel at a rate of 10,000 cells per second. This approach achieved label-free cell classification and enabled rapid identification of tumor cells. However, the design and modeling of microfluidic chips require a substantial background in computation and fluid mechanics, which limits the widespread application and dissemination of this technology.

4.3 Screening for drug-resistant cancer cells

Screening for cancer cells carrying mutations in drug resistance-related genes is of great value in early diagnosis and treatment of lung cancer. Detection and screening of anticancer drug-resistant cancer cells harbouring genes with single-nucleotide mutations has received much attention in cancer diagnosis in recent years (Xu et al., 2013; Sander et al., 2019; Shigeto et al., 2020). Shigeto et al. (2020) used single-cell microarray chips and peptide nucleic acid (PNA)-DNA probes to specifically detect T790M mutant cancer cells. Among secondary drug resistance mutations, EGFR-mutant phenotypes are most common in NSCLC due to mutations in the receptor-binding region of the EGFR gene (T790M) driving secondary mutations in the kinase domain, reducing the affinity of tumour cells for targeted therapies (Sun et al., 2022; Zhou et al., 2022). Tyrosine kinase inhibitors (TKIs), as represented by gefitinib, are molecularly targeted anticancer drugs that bind to the structural domain of the EGFR protein tyrosine kinase (Lynch et al., 2004; Yun et al., 2008), inducing cell death by inhibiting the signal transduction of epidermal growth factor (Kobayashi and Mitsudomi, 2016). Therefore, analysis of the proportion or number of cancer cells comprising the T790M mutation is essential for drug-resistant NSCLC. The results showed that cancer cells with the T790M mutation had a strong fluorescent signal, which provided an effective pathway for early diagnosis of NSCLC. Yang et al. (2018) used electrospinning technology to develop an LOC with a poly (lactic-co-glycolic acid) (PLGA) membrane. In addition, cultured lung cancer cells, lung fibroblasts and vascular endothelial cells on both sides of the membrane were used to evaluate the antitumour effect of gefitinib. These factors have made LOC a promising drug screening tool, providing a scientific basis for its widespread use.

4.4 Auxiliary application of NDDS in LOC

Due to various biological barriers in the human body, traditional drug delivery methods are often inefficient, have nonspecific distribution, and have difficulty reaching the target site (Blanco et al., 2015). Development of NDDSs for reversing drug resistance offers a novel strategy for tumour treatment (Calixto et al., 2016; Majidinia et al., 2020). The current NDDSs used for clinical treatment mainly include organic NDDSs (Huang et al., 2018; Jain and Jain, 2018), inorganic NDDSs (Yang and Yu, 2016), and composite multifunctional NDDSs (Liu et al., 2021). These nanodrug carriers have a strong drug-carrying capacity to transport drugs to specific targets to improve drug efficacy (Liu et al., 2017; Moosavian and Sahebkar, 2019). Most antitumour drugs are small molecule compounds with poor water solubility, low drug metabolism kinetics and other defects (Ke et al., 2018). Because of the lack of tissue selectivity and targeting, they are widely distributed to various tissue sites after entering the circulatory system and are easily captured and metabolized by the reticuloendothelial system (RES) or excreted through glomerular filtration (Kobayashi et al., 2014; Shirali and Sprangers, 2022). This not only reduces the utilization rate of drugs but also increases their toxic side effects. Currently, nanotechnology, especially nanopreparation technology, is used to combine drugs with inorganic or organic materials in certain ways (including chemical bonding, physical embedding, encapsulation, electrostatic adsorption, etc.) and control the diameter to 0.1–100 µm to prepare nanomedicines (De Jong and Borm, 2008). When nanomedicines enter the circulatory system, due to their unique high permeability and long-term retention (EPR) effect, they can enhance drug accumulation in tumour tissue and slow down drug efflux (He et al., 2015; Park et al., 2019; Shi et al., 2020). In addition, some nanomaterials have special properties, such as temperature-sensitive properties (Amin et al., 2020) and pH-sensitive properties (Fang et al., 2020). These strategies provide broad prospects for drug release in specific environments.

Many potential chemotherapeutic agents are not available for clinical use due to off-target toxicity, unstable metabolism or poor pharmacokinetics. NDDS provides drugs in a controlled and specific manner, offering feasible solutions for drug development to address the high clinical failure rate. Nanodrug delivery systems (NDDSs), such as nanoparticles and nanocapsules, allow for antineoplastic drugs to be administered to patients while modulating the location and concentration of release in the body, improving drug efficacy, minimizing the exposure of healthy cells to the drug and reducing the risk of drug toxicity (Li et al., 2019). NDDSs generally use intravenous infusion to inject drugs into the circulatory system, and nanoparticles interact with dynamic blood flow; in contrast, traditional models have difficulty reproducing the hydrodynamic characteristics of blood flow (Cho et al., 2011). In addition, the interaction between nanoparticles and endothelial cells in dynamic blood is often overlooked (Sindhwani et al., 2020). However, microfluidic LOC platforms with vascular endothelial cells can dynamically evaluate the role of nanoparticles in the circulatory system. Caballero et al. (Caballero et al., 2017) described how microfluidic chips of tumor blood vessels can be used to better elucidate the behavior of new nanocarriers in the microcirculation of both healthy and cancerous tissues. They investigated phenomena such as extravasation, immune response, and endothelial targeting under flow in capillaries, which can be accurately modeled using microfluidics. This plays a crucial role in advancing next-generation targeted drug delivery methods.

4.5 Toxicology research

Drug-induced toxicity is one of the most important issues resulting from inaccurate preclinical models (Dzidic-Krivic et al., 2024). For example, approximately 20% of acute kidney injuries (AKI) after hospitalization can be attributed to nephrotoxicity induced by pharmaceutical agents (Kim and Moon, 2012). There is an urgent need for more precise and accurate techniques to reconstruct organ-specific therapeutic features associated with drug interventions, including examining drug delivery and real-time monitoring of cellular and tissue responses to specific medications. Organ-on-a-Chip technology has the potential to improve success rate of drug development pipelines, as it can recapitulate organ-level pathophysiology and clinical responses. Ewart et al. (Ewart et al., 2023) analyzed 870 liver chips to assess their ability to predict drug-induced liver injury. The results showed that the liver chips achieved a sensitivity of 87% and a specificity of 100% through blind testing with 27 known hepatotoxic and non-toxic drugs. Ingber et al. (Goyal et al., 2024) also utilized human organ chips to conduct research in regenerative pharmacology and toxicology, revealing healing and regeneration mechanisms in various human tissues, which provides crucial insights for predicting the clinical efficacy or toxicity of drugs. Therefore, integrating predictive organ chips into the drug development can significantly enhance drug discovery and development, allowing manufacturers to bring safer and more effective drugs to market in less time and at lower costs.

4.6 Personalized medicine

In clinical settings, the efficacy and tolerability of drugs vary significantly among populations. There are individual differences among different lung cancer patients, and variations in sensitivity to various targeted drugs exist. For example, when T790M mutation or deletion occurs, the use of EGFR TKIs in treatment is more likely to result in decreased affinity and drug resistance (Meador and Hata, 2020). Currently, genomic sequencing of solid tumors and identification of key molecular targets have fundamentally altered the treatment approach for both primary and metastatic cancers, turning them from fatal diseases into chronic conditions, and even achieving complete cures. Benam et al. (2016) designed a human lung ‘small airway-on-a-chip’ for the analysis of organ-level lung pathophysiology in vitro. Exposing patient epithelial cells to Interleukin 13 (IL-13) simulates the effects of asthma exacerbation. By obtaining patient-specific stem cells to reconstruct the inflammatory phenotype on-chip, not only can the efficacy of novel experimental therapies be tested, but also the molecular mechanisms of drug action can be dissected at the level of in vitro human organ backgrounds. Veith et al. (2024) employed patient-derived lung tumor chips to assess personalized responses to anti-PD-1 therapy. By harnessing the power of real-time imaging and advanced image analysis algorithms, they rapidly and accurately measured the impact of immune checkpoint inhibitors on T cell-mediated cancer cell death, paving the way for a new approach to analyzing personalized immune therapy responses. However, personalized medical applications on chips still face many limitations. Certain cell types, such as cardiomyocytes and neurons, are difficult to maintain regeneration and differentiation in vitro environments (Zhang et al., 2017). These cultures are still evidently far from fully recapitulating the complexity of the in vivo situation. Therefore, the potential predictive power of such a chip approach could not be validated. Larger patient cohorts and biopsy-compatible chips will be necessary.

4.7 Effect of ferroptosis on drug resistance

Ferroptosis is a newly discovered form of immunogenic cell death (ICD). It is driven by iron-dependent phospholipid peroxidation and regulated by multiple metabolic and signaling pathways (Stockwell, 2022). Ferroptosis is typically accompanied by the abundant accumulation of intracellular iron and the generation of oxidative hydroxyl radicals. It is characterized by the production of lethal levels of iron-dependent lipid peroxidation (Chen et al., 2021; Wang D. et al., 2023). Recent research has shown that ferroptosis in tumour cells may cause robust antitumour immune effects, even in drug-resistant cancer types (Wang et al., 2020). Dai et al. (Wang et al., 2021) developed an assembly of exosome inhibitor (GW4869) and ferroptosis inducer (Fe3+), aimed at reversing exosome-mediated immune suppression by programmed death-ligand 1(PD-L1) and enhancing tumor ferroptosis, thereby improving the efficacy of immunotherapy against tumors. Some recent studies have found that ferroptosis is also associated with various types of lung injury. For example, Fan et al. found that PM2.5-mediated ferroptosis causes endothelial cell damage in human lungs (Guohua et al., 2021). Toxic PM2.5 can invade the small airways and interfere with lung physiology, eventually leading to chronic lung damage and even lung cancer (Cheng et al., 2021). Alvarez et al. reported that the protein NFS1 protects lung cancer cells from ferroptosis. When blocking NFS1, high oxygen levels can lead to degradation of iron–sulfur clusters in lung cancer cells, thereby delaying their growth and making them easier to kill. Therefore, constructing a lung cancer model using lung chips can simulate a high oxygen environment to avoid ferroptosis caused by ROS. Such efforts may lead to a new strategy for ferroptosis-mediated anticancer therapy.

5 Conclusion and remarks

LOC is an emerging technology based on microfluidic platforms and in vitro cell culture. Numerous studies have revealed the broad prospects of LOC for diagnosis and treatment of respiratory diseases (Shrestha et al., 2020; Si et al., 2021). It can reconstruct the microstructure of the alveolar capillary unit on a microfluidic chip, simulate the alveolar air‒water interface, accurately manipulate the tumour microenvironment, and analyse the effects of shear force, tension, and pressure on various physiological and pathological lung functions. Such analysis of physical and microenvironmental factors on cells and tissues cannot be achieved by other in vitro models.

Although organ chips have some advantages compared to other in vitro models, they do have certain limitations. First, most LOC devices use PDMS copy moulding methods. However, PDMS may absorb a portion of hydrophobic drugs, which may affect the accuracy of evaluating concentrated drug solutions in high-surface microchannels (Ozyurt et al., 2023). Therefore, researchers are actively looking for alternatives or new technologies for PDMS, such as hydrogels, thermoplastic materials, and 3D printing materials. Second, it is important to mention that while researchers can currently mimic the important characteristics of cancer physiology using in vitro 3D tumour models, even the most advanced 3D cancer models cannot fully mimic tumour physiology and, therefore, cannot fully replace animal models in drug delivery research (Ingber, 2020). Furthermore, the study of inter-organ communication is presently unattainable, multi-organ-a-chip can also be considered to solve such limitation.

In this review, we introduced LOC models and their achievements in lung cancer and drug development. LOC models provided an efficient and accurate platform for modelling lung diseases as well as antitumour drug studies. These systems can reduce the cost of medication development, lessen the social and economic burden of lung cancer, and decrease the reliance of researchers on conventional in vitro and animal models. Moreover, the combination of LOC and emerging technologies not only facilitates drug discovery and development but also contributes significantly to development of translational medicine and toxicology. We believe that organ-on-a-chip technology will bring more revolutionary changes to others in the field in the future.

Author contributions

LL: Writing–original draft, Writing–review and editing. WB: Writing–review and editing. GW: Writing–review and editing. XJ: Writing–review and editing. HX: Writing–review and editing. HZ: Writing–original draft, Writing–review and editing.

Funding

The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: lung-on-a-chip, resistance mechanism, tumour microenvironment, nano drug delivery systems, ferroptosis

Citation: Li L, Bo W, Wang G, Juan X, Xue H and Zhang H (2024) Progress and application of lung-on-a-chip for lung cancer. Front. Bioeng. Biotechnol. 12:1378299. doi: 10.3389/fbioe.2024.1378299

Received: 02 February 2024; Accepted: 08 May 2024;
Published: 24 May 2024.

Edited by:

Nic Davis Leipzig, University of Akron, United States

Reviewed by:

Gwang-Bum Im, Harvard Medical School, United States
Marco Campisi, Dana–Farber Cancer Institute, United States

Copyright © 2024 Li, Bo, Wang, Juan, Xue and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Hongwei Zhang, emhhbmdob25nd2VpeXhAMTI2LmNvbQ==; Haiyi Xue, eHVlaHkwOTIxQDEyNi5jb20=

These authors have contributed equally to this work

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