Transforming growth factor‑β1 induces type II collagen and aggrecan expression via activation of extracellular signal‑regulated kinase 1/2 and Smad2/3 signaling pathways

Zhu,Yanhui; Tao,Hairong; Jin,Chen; Liu,Yonzhang; Lu,Xiongwei; Hu,Xiaopeng; Wang,Xiang

doi:10.3892/mmr.2015.4068

Transforming growth factor‑β1 induces type II collagen and aggrecan expression via activation of extracellular signal‑regulated kinase 1/2 and Smad2/3 signaling pathways

Authors:
- Yanhui Zhu
- Hairong Tao
- Chen Jin
- Yonzhang Liu
- Xiongwei Lu
- Xiaopeng Hu
- Xiang Wang
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Affiliations: Department of Orthopaedics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201900, P.R. China
Published online on: July 9, 2015 https://doi.org/10.3892/mmr.2015.4068
Pages: 5573-5579

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Abstract

Transforming growth factor (TGF)‑β regulates the anabolic metabolism of articular cartilage and prevents cartilage degradation. TGF‑β1 influences cellular proliferation, differentiation and the extracellular matrix through activation of the extracellular signal‑regulated kinase (ERK)1/2 and Smad2/3 signaling pathways. However, it has remained to be fully elucidated precisely how the ERK1/2 and Smad2/3 signaling pathways mediate anabolic processes of articular cartilage. The present study investigated how ERK1/2 and Smad2/3 signaling mediate TGF‑β1‑stimulated type II collagen and aggrecan expression in rat chondrocytes. The results confirmed that TGF‑β1 stimulates type II collagen and aggrecan expression in rat chondrocytes, and furthermore, that the ERK1/2 and Smad2/3 signaling pathways were activated by TGF‑β1. Conversely, the TGF‑β receptor I (ALK5) kinase inhibitor SB525334 significantly impaired TGF‑β1‑induced type II collagen and aggrecan expression, coinciding with a reduction of ERK1/2 and Smad3 phosphorylation. In addition, TGF‑β1‑induced type II collagen and aggrecan expression were significantly suppressed by ERK1/2 inhibitor PD98059. Similarly, TGF‑β1‑stimulated type II collagen and aggrecan expression were decreased in the presence of a Smad3 phosphorylation inhibitor SIS3. Therefore, the present study demonstrated that the ERK1/2 and Smad2/3 signaling pathways regulate type II collagen and aggrecan expression in rat chondrocytes.

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