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Correction ARTICLE

Front. Bioeng. Biotechnol., 26 October 2020 |

Corrigendum: Molecular Insights Into Lysyl Oxidases in Cartilage Regeneration and Rejuvenation

Weiping Lin1*, Liangliang Xu2 and Gang Li1,3*
  • 1Department of Orthopaedics and Traumatology, Stem Cells and Regenerative Medicine Laboratory, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
  • 2The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Lingnan Medical Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China
  • 3MOE Key Laboratory for Regenerative Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China

A Corrigendum on
Molecular Insights Into Lysyl Oxidases in Cartilage Regeneration and Rejuvenation

by Lin, W., Xu, L., and Li, G. (2020). Front. Bioeng. Biotechnol. 8:359. doi: 10.3389/fbioe.2020.00359

In the original article, there was a mistake in Figure 4 as published. The corrected Figure 4 and figure legend appear below.


Figure 4. Schematic illustration of copper-mediated hypoxia-response element (HRE)-directed transcriptional fine-tuning of cartilage homeostasis-associated genes in chondrocytes. Under normoxia, HIF-1α undergoes PHDs-mediated prolyl hydroxylation, and prolyl OH HIF-1α is ligated by pVHL, an E3 ubiquitin ligase, and degraded by the proteasome finally. Copper stabilizes HIF-1α protein by inhibiting PHDs activity in an iron-independent manner. Under hypoxia or through interaction with HSP90, HIF-1α stabilizes and accumulates in the cell nucleus, where it forms a dimer with the HIF-1β subunit and a putative unidentified copper-chaperone. The dimer then forms a transcriptional complex with coactivator CBP/p300 through binding with HRE, regulating the expression of various downstream target genes, such as LOXL2, SOX9, and VEGF. Simultaneously, SOX9 is a negative regulator of VEGF, whilst the expression of SOX9 target genes (i.e., Type II collagen, and Aggrecan) is initiated, which is essential for cartilage synthesis and survival during both embryonic joint development and cartilage homeostasis. HIF-1α, hypoxia-inducible factor-1α; PHDs, prolyl hydroxylases; OH: enzymatic hydroxylation; pVHL, von Hippel-Lindau tumor suppressor protein; HRE, hypoxia-response element; Ub, ubiquitinated; SOX9, SRY (sex determining region Y)-box 9; HSP90, heat shock protein 90; LOXL2, lysyl oxidase-like 2; VEGF, vascular endothelial growth factor; Cu, copper.

The authors apologize for this error and state that they do not change the scientific conclusions of the article in any way. The original article has been updated.

Keywords: lysyl oxidase, cartilage, hypoxia-inducible factor, copper, transcription activity, regeneration, rejuvenation

Citation: Lin W, Xu L and Li G (2020) Corrigendum: Molecular Insights Into Lysyl Oxidases in Cartilage Regeneration and Rejuvenation. Front. Bioeng. Biotechnol. 8:598323. doi: 10.3389/fbioe.2020.598323

Received: 24 August 2020; Accepted: 25 August 2020;
Published: 26 October 2020.

Approved by:

Frontiers Editorial Office, Frontiers Media SA, Switzerland

Copyright © 2020 Lin, Xu and Li. 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: Gang Li,; Weiping Lin,

These authors have contributed equally to this work