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Comparative transcriptome analysis provides insight into the molecular targets and signaling pathways of deer TGF-1 regulating chondrocytes proliferation and differentiation

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Abstract

Background

Chondrocytes are the only cell components in the cartilage, which has the poor regeneration ability. Thus, repairing damaged cartilage remains a huge challenge. Sika deer antlers are mainly composed of cartilaginous tissues that have an astonishing capacity for repair and renewal. Our previous study has demonstrated the transforming growth factor β (TGF-β1) is considered to be a key molecule involved in rapid growth, with the strongest expression in the cartilage layer. However, it remains to be clarified whether deer TGF-β1 has significantly different function from other species such as mouse, and what is the molecular mechanism of regulating cartilage growth.

Methods

Primary chondrocytes was collected from new born mouse rib cartilage. The effect of TGF-β1 on primary chondrocytes viability was elucidated by RNA sequencing (RNA-seq) technology combined with validation methods such as quantitative real-time polymerase chain reaction (qRT-PCR) and immunofluorescence assay (IFA). Differential expression genes were identified using the DEGseq package.

Results

Our results demonstrated that the overexpression of deer TGF-β1 possibly promoted chondrocyte proliferation and extracellular matrix (ECM) synthesis, while simultaneously suppressing chondrocyte differentiation through regulating transcription factors, growth factors, ECM related genes, proliferation and differentiation marker genes, such as Comp, Fgfr3, Atf4, Stat1 etc., and signaling pathways such as the MAPK signaling pathway, inflammatory mediator regulation of TRP channels etc. In addition, by comparing the amino acid sequence and structures between the deer TGF-β1 and mouse TGF-β1, we found that deer TGF-β1 and mouse TGF-β1 proteins are mainly structurally different in arm domains, which is the main functional domain. Phenotypic identification results showed that deer TGF-β1 may has stronger function than mouse TGF-β1.

Conclusion

​These results suggested that deer TGF-β1 has the ability to promote chondrogenesis by regulating chondrocyte proliferation, differentiation and ECM synthesis. This study provides insights into the molecular mechanisms underlying the effects of deer TGF-β1 on chondrocyte viability.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

TGF-β1:

Transforming growth factorβ

qRT-PCR:

Quantitative real-time polymerase chain reaction

IFA:

Immunofluorescence assay

ECM:

Extracellular matrix

OA:

Osteoarthritis

RNA-seq:

RNA sequencing

OD:

Optical density

SRA:

Sequence read archive

HISAT:

Hierarchical indexing for spliced alignment of transcripts

KEGG:

Kyoto encyclopedia of genes and genomes

GO:

Gene ontology

OE:

Overexpression

NGF:

Nerve growth factor

IGF-1:

Insulin‐like growth factor 1

BMSCs:

Mesenchymal stem cells

HSP70:

Heat shock protein 70

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Acknowledgements

This research was supported by Jilin Province Young and Middle-aged Science and Technology Innovation and Entrepreneurship Outstanding Talent (team) Project (No. 20210509001RQ), National Natural Science Foundation of China (No. 81973887), and Innovation Team and Talents Cultivation Program of National Administration of Traditional Chinese Medicine (No. ZYYCXTD-D-202001).

Funding

This research was supported by Jilin Province Young and Middle-aged Science and Technology Innovation and Entrepreneurship Outstanding Talent (team) Project (No. 20210509001RQ), National Natural Science Foundation of China (No. 81973887), and Innovation Team and Talents Cultivation Program of National Administration of Traditional Chinese Medicine (No. ZYYCXTD-D-202001).

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Authors

Contributions

ZZ, HD and XW: Manuscript writing. ZZ, JZ, JZ, JY: Experiment conduction and data analysis. HD, BY, XL: Manuscript subject design.

Corresponding authors

Correspondence to Xukai Wang or Haisi Dong.

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The authors declare that they have no conflict of interest.

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All procedures were performed in accordance with the guidelines of the Institutional Animal Ethics Committee of Changchun University of Chinese Medicine (No. ccucm-2017-0015).

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Zhou, Z., Zhong, J., Zhang, J. et al. Comparative transcriptome analysis provides insight into the molecular targets and signaling pathways of deer TGF-1 regulating chondrocytes proliferation and differentiation. Mol Biol Rep 50, 3155–3166 (2023). https://doi.org/10.1007/s11033-023-08265-z

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