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Up-regulation of niacinamide in intervertebral disc aggrecan in vitro

Xiaoqian Xiong1, Shuhua Yang, Zengwu Shao

  • 1Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.

Journal of Huazhong University of Science and Technology. Medical Sciences = Hua Zhong Ke Ji Da Xue Xue Bao. Yi Xue Ying De Wen Ban = Huazhong Keji Daxue Xuebao. Yixue Yingdewen Ban
|May 25, 2006
PubMed

Insights

Niacinamide (Nia) shows potential in treating intervertebral disc (IVD) degeneration. This study found Nia increased aggrecan expression and protected IVDs from damage in vitro, suggesting a possible clinical therapy.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Regenerative Medicine

Background:

  • Intervertebral disc (IVD) degeneration is a significant cause of back pain.
  • Interleukin-1 (IL-1) is a key mediator in IVD degeneration.
  • Aggrecan is a crucial proteoglycan for IVD structure and function.

Purpose of the Study:

  • To investigate the regulatory effects of niacinamide (Nia) on IVD aggrecan expression in vitro.
  • To evaluate Nia's protective effects against IL-1-induced IVD degeneration.

Main Methods:

  • Established a rabbit IVD degeneration model induced by IL-1.
  • Treated normal and degenerated IVDs with varying concentrations of Nia (0.05, 0.25, 0.5 mg/mL).
  • Assessed glycosaminoglycan (GS) content, safranin O-fast green staining intensity, and aggrecan core protein gene expression via RT-PCR.

Main Results:

  • Nia treatment significantly increased GS content in nucleus pulposus (NP) and fibrous rings, with dose-dependent effects.
  • Safranin O-fast green staining indicated increased matrix density and alleviated histological damage in Nia-treated IVDs.
  • RT-PCR confirmed that Nia upregulated aggrecan core protein gene expression in IL-1-induced degenerated IVDs.

Conclusions:

  • Niacinamide upregulates aggrecan expression in intervertebral discs.
  • Nia demonstrates protective effects against IL-1-induced IVD degeneration in vitro.
  • Nia represents a potential therapeutic agent for clinical management of IVD degeneration.

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