Neuroimmune cardiovascular interfaces in atherosclerosis
Sarajo K. Mohanta
Changjun Yin
Christian Weber
Andreas J. R. Habenicht- 1Institute for Cardiovascular Prevention, Ludwig-Maximilians-Universität München (LMU), Munich, Germany
- 2German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
- 3Institute of Precision Medicine, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
- 4Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
Two pairs of biological systems acting over long distances have recently been defined as major participants in the regulation of physiological and pathological tissue reactions: i) the nervous and vascular systems form various blood-brain barriers and control axon growth and angiogenesis; and ii) the nervous and immune systems emerge as key players to direct immune responses and maintain blood vessel integrity. The two pairs have been explored by investigators in relatively independent research areas giving rise to the concepts of the rapidly expanding topics of the neurovascular link and neuroimmunology, respectively. Our recent studies on atherosclerosis led us to consider a more inclusive approach by conceptualizing and combining principles of the neurovascular link and neuroimmunology: we propose that the nervous system, the immune system and the cardiovascular system undergo complex crosstalks in tripartite rather than bipartite interactions to form neuroimmune cardiovascular interfaces (NICIs).
The neurovascular link
Reviewing interactions between the nervous system and the cardiovascular system, Carmeliet and Tessier-Lavigne recently pointed out the significance of observations made by the Belgian anatomist Andreas Vesalius in 1543 for our current views of interactions between the nervous and cardiovascular systems (Carmeliet and Tessier-Lavigne, 2005). Indeed, the studies by Vesalius turn out to be highly relevant for our current understanding of the common mechanisms underlying nerve and blood vessel development. He was the first to point to the striking macroanatomical proximity of the peripheral nervous system and the vascular system. Moreover, recent research identified a multitude of cardiovascular-nervous system interactions leading to discoveries of countless functionally relevant mediators released from either tissue and acting on the other. Likewise, basic research into the evolution of neurogenesis, immune system development and angiogenesis in small animals (Zacchigna et al., 2008) from nematode worms (Caenorhabditis elegans) to fruit flies (Drosophila melanogaster) to zebra fish (Danio rerio) have expanded current notions regarding the functionality of the relationships of three systemically acting tissues: the nervous system, the immune system and the cardiovascular system. Whereas C. elegans have developed a well-organized nervous system consisting of 302 stereotyped neurons (of a total of 959 somatic cells), they lack a cardiovascular system. However, they have acquired an emerging primitive innate immune system consisting of sessile muscle cells that are capable of phagocytosis of danger-signaling macromolecules including infectious organisms. Of note, this nematode innate immune system is regulated by neuronal inputs (Liu and Sun, 2021). Next in the phylogenetic tree of invertebrate multicellular organisms considered here, are fruit flies which own a more advanced and well-developed nervous system (∼100,000 neurons) and an emerging innate non-sessile circulating immune system in their haemolymph which can be regarded as a primitive circulatory system. Finally, zebrafish feature all three systems at advanced stages of development including a well-developed regularly beating heart (Jopling et al., 2010). In particular, the zebrafish turned out to be an important model for human heart development and a series of heart diseases including aorta calcification (Singh et al., 2019). Furthermore, the zebrafish allows to examine heart development with a speed and information not achievable even in mouse models. Indeed, zebrafish allow to study neural-cardiovascular connections to define the role of every single nerve from the heart and the cardiovascular system (Vedder et al., 2020). Fishman et al. pioneered the zebrafish as a model, generated multiple genetically altered fish and applied them to human disease using powerful genetic screens (Lee et al., 1994; Weinstein et al., 1995; Stainier et al., 1996; Fouquet et al., 1997; Childs et al., 2002). When taken together, these data revealed that the nervous system appeared first during evolution of multiple species followed by the immune system and the cardiovascular system (Tam and Watts, 2010; Brunet et al., 2014). Recent progress in understanding the neurovascular link in the central nervous system and in the peripheral nervous system, respectively, expands our perceptions of the functional implications in physiology (Walchli et al., 2015). Moreover, the relevance of multi-tissue interactions of the three tissues to understand disease pathogeneses as varied as atherosclerosis, Alzheimer′s Disease (Yin et al., 2019) and Diabetes Mellitus (Malheiro et al., 2021) become increasingly apparent at a rapid pace.
Neuroimmunology
Parallel to the field of the neurovascular link, a pair of two further systemically interacting biological systems, i.e., the nervous and immune systems, burgeoned during the last decades giving rise to the ever growing - and indeed exploding - field of neuroimmunology. Key growth and survival signals including mediators of neuron neogenesis, axon growth, synaptogenesis, target innervation, nerve growth factor-dependent neuron survival among others and multiple mediators of blood vessel morphogenesis derived from both the nervous and the immune systems have been identified (Glebova and Ginty, 2005). Many, if not all, of these mediators also turn out to participate in diseases as varied as cancer, autoimmune diseases, multiple chronic inflammatory diseases, degenerative and inflammatory brain diseases, bacterial infectious diseases and peripheral nervous system-associated diseases (Andersson and Tracey, 2012; Chiu et al., 2012; Olofsson et al., 2012; Steinman, 2012; Tracey, 2012; Magnon et al., 2013; Han et al., 2015; Hanoun et al., 2015; McMahon et al., 2015; Talbot et al., 2016; Chu et al., 2020; Cserep et al., 2020; Udit et al., 2022). As a result of rather recent studies, neuroimmunology has now reached the realm of neuronal control by distinct brain nuclei and indeed neuron subtypes to regulate peripheral immune responses during physiology and pathophysiology (Tracey, 2012; Magnon et al., 2013). In addition to identifying afferent sensory nervous system-brain axes, regulatory efferent brain-peripheral organ projections are being elucidated (Weinstein et al., 1995; Andersson and Tracey, 2012; Steinman, 2012; Walchli et al., 2015). A striking recent example of this emerging area of neuroimmunology has been the regulation of humoral immune responses in the spleen by distinct cortico-releasing hormone-expressing neurons in the central amygdala and the parabrachial nucleus that instruct the splenic nerve which in turn regulates plasma cell abundance (i.e., B cell immunity) (Zhang et al., 2020). These studies indicate that we are on the cusp of better understanding the dominant roles of the brain in regulating fundamental biological systems in the periphery and the brain itself (already apparent in nematodes as outlined above) including phenomena as diverse as thermoregulation (Morrison and Nakamura, 2019), emotions and empathy (Gehrlach et al., 2019; Zych and Gogolla, 2021) and gut inflammation (Koren et al., 2021; Brea and Veiga-Fernandes, 2022). It becomes apparent that these advances include previously unknown phenomena whose molecular underpinnings had escaped any level of comprehension in the past: We would emphasize the work of Anderson and Adolphs who recently pointed to the possibility that even insects express emotions that they termed emotion primitives by citing Darwin′s comment “Even insects express anger, terror, jealousy and love, by their stridulation” (Anderson and Adolphs, 2014). Indeed, a key brain area termed the insular cortex has recently been identified as a maintenance and integration structure for fear and empathy in mice (Gogolla, 2017; Klein et al., 2021). When taken together, neuroimmunology is now identifying new brain-controlled peripheral biological systems of major significance in physiology and disease. The vascular immune crosstalk has been extensively described elsewhere (Yin et al., 2017; Klein et al., 2021; Brea and Veiga-Fernandes, 2022) and is not the focus of this mini-review.
Long distance talk of three companions in atherosclerosis
Early studies of our group observed that the majority of immune cells in late stage atherosclerosis (Libby et al., 2011) accumulated in the lamina adventitia, i.e. the connective tissue coat of arteries, rather than in intima plaques. Some of the immune cell aggregates had a large B cell component particularly in areas of heavily diseased artery segments. To our initial surprise, these aggregates resembled tertiary lymphoid organs that had previously reported in distinct types of cancer, autoimmune diseases and chronic unresolvable inflammatory diseases (Brea and Veiga-Fernandes, 2022). Following a series of imaging and functional experiments, we termed these atherosclerosis-associated aggregates artery tertiary lymphoid organs (ATLOs) (Grabner et al., 2009; Yin et al., 2017). We phenotyped ATLOs and found that they harbor multiple B cell subtypes including germinal center B cells, B1 cells in activated B cell follicles, both short-lived and long-lived plasma cells in separate niches and also separate T cell areas in addition to innate immune cells (Srikakulapu et al., 2016). Subsequent in vitro studies revealed that stimulation of the lymphotoxin β receptor on arterial smooth muscle cells changed their phenotype to resemble cells that had been termed lymphoid organizer cells as they expressed the lymphorganogenic chemokines CXCL13 and CCL19 (Mohanta et al., 2022; Hu et al., 2019). These in vitro data together with the observation that arterial media smooth muscle cells adjacent to atherosclerotic plaques in vivo showed strong CXCL13 expression led us to generate transgenic mice with a selective deletion of the lymphotoxin β receptor in the smooth muscle cells. In aged hyperlipidemic smooth muscle cell-specific lymphotoxin β receptor-deletion mice, the extent of atherosclerosis burden was higher than in their hyperlipidemic counterparts. These data indicated that ATLOs may affect atherosclerosis progression (Hu et al., 2015). Meanwhile, Akhavanpoor et al. (2018) observed ATLO formation in human atherosclerotic coronary arteries: They reported that all patients with myocardial infarction showed ATLOs stage-III in their coronary artery adventitia that we had previously defined as large T/B cell aggregates containing follicular dendritic cells in germinal centers. More recently, we isolated ATLO and plaque T cells, analyzed them using a pairing approach of single cell RNA sequencing (scRNA-seq) with single cell T cell receptor sequencing and observed clonal expansion of CD4, T regulatory and CD8 T cells. These data showed the power of scRNA-seq approaches to understand the mechanisms of atherosclerosis (Wang et al., 2022; Zhang et al., 2022).
In parallel studies, we searched for molecular cues of a poorly understood form of dementia, i.e., vascular dementia, that had previously be linked to Alzheimer′s disease: Distinct brain areas including the choroid plexus and areas heavily burdened by Alzheimer plaques in mouse and human brains were examined in parallel with murine and human atherosclerotic plaques. Interestingly, the classical complement component C1q was found to form high-affinity complexes with Apolipoprotein E and inhibition of the C1q-mediated inflammatory pathway using siRNA treatment in mice reduced both atherosclerosis and Alzheimer plaque (intermediate) burdens (Yin et al., 2019). Using laser capture microdissection-based whole genome-wide transcript profiling, we observed a major and dominant interferon signature in the choroid plexus that was dependent on the transgenic expression of the Apolipoprotein E4 isoform in transgenic knock-in mice maintained on a Western type diet indicating that the genetics of key regulatory genes in atherosclerosis progression deserve attention. These findings directly associated Apolipoprotein E and its isoforms with major brain diseases in which neuroimmune responses play major roles (Yin et al., 2019). As the adventitia forms the major conduit for the nervous system to reach distant targets (as Vesalius noted, see above) in hyperlipidemic mice during aging (Moos et al., 2005; Mohanta et al., 2014), we hypothesized that atherosclerosis-specific adventitia segments may interact with the nervous system.
All these studies raised the possibility that ATLOs may be a model to study how the atherosclerotic arterial wall may directly crosstalk with the peripheral nervous system. Using a multitude of imaging methods including tissue clearing, we recently observed that the components of the peripheral nervous system in the artery adventitia adjacent to atherosclerotic plaques underwent marked restructuring (Mohanta et al., 2022; Sun et al., 2022). Atherosclerosis-triggered restructuring included axon outgrowth, formation of junction-like synaptic connections between immune cells and axons and formation of growth cones among others (Figure 1). Moreover, surgical removal of the sympathetic celiac ganglia in the abdominal portion of the aorta in the aged mice attenuated the burden of atherosclerosis in this segment (Mohanta et al., 2022). These morphological and functional studies led us to propose that the diseased arterial wall directly crosstalks to both the immune and the nervous system in tripartite rather than bidirectional interactions. In addition to the adventitia NICI depicted below, other changes were noticed in murine and human atherosclerosis including inflammatory infiltrates around peripheral nervous system ganglia and nerves. We therefore suggest that the tripartite tissue interaction supports the existence of a until now underappreciated disease paradigm (Mohanta et al., 2022).
FIGURE 1. Choreography of an adventitia NICI in advanced murine atherosclerosis. Recent studies into a possible innervation of the adventitia by the axons of the peripheral nervous system revealed that both the sensory and the sympathetic nervous systems undergo marked restructuring in artery segments afflicted with atherosclerosis in murine models of atherosclerosis and human adventitia segments adjacent to plaques in multiple territories of the arterial tree [adopted from (Mohanta et al., 2022)].
Future perspectives
Future work should be directed towards a more detailed understanding of the morphology and function of the adventitia and other peripheral nervous system NICIs. These studies would characterize the axon tips in the adventitia of diseased artery segments using quantitative electron microscopy and morphologically delineate the neuroimmune junctions. Moreover, a more complete functional characterization of the sensory nervous system including the pain receptors/nociceptors on atherosclerosis progression may yield new information on the adventitia NICI when scRNA-seq approaches are employed (Wang, 2023). We also propose to interrogate the NICI hypothesis in diseases other than atherosclerosis including cancer, rheumatoid arthritis and autoimmune diseases that are associated with TLOs.
Author contributions
All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.
Funding
This work was funded by the Deutsche Forschungsgemeinschaft (DFG): MO 3054/1-1 and Corona Foundation grant to SM; YI 133/2-1, YI 133/3-5, and LMUexcellent 867949-0 to CY; HA 1083/15-4, HA 1083/15-5 and ERA-CVD (PLAQUEFIGHT) 01KL1808 to AH; DFG Cluster of Excellence SyNergy (EXC 2145 SyNergy 390857198) to CW.
Acknowledgments
We apologize for not citing the large number of important contributions of colleagues working in the fields of neurovascular interactions, neuroimmunology and cardiovascular biology because of space restrictions. We acknowledge Easemedcontrol R&D and Co., KG for illustrations.
Conflict of interest
SM, CY, and AH are owners of Easemedcontrol R&D and Co KG.
The remaining 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.
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Keywords: neuroimmune cardiovascular interface, neuroimmunology, neurovascular link, adventitia, atherosclerosis, artery tertiary lymphoid organs
Citation: Mohanta SK, Yin C, Weber C and Habenicht AJR (2023) Neuroimmune cardiovascular interfaces in atherosclerosis. Front. Cell Dev. Biol. 11:1117368. doi: 10.3389/fcell.2023.1117368
Received: 06 December 2022; Accepted: 20 January 2023;
Published: 30 January 2023.
Edited by:
İsmail Cimen, Altos Labs Bay Area Institute, United StatesReviewed by:
Xi Feng, Altos labs, United StatesCopyright © 2023 Mohanta, Yin, Weber and Habenicht. 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: Sarajo K. Mohanta, Sarajo.Mohanta@med.uni-muenchen.de