• Spine · Feb 2013

    Tissue renin-angiotensin system in the intervertebral disc.

    • Ryo Morimoto, Koji Akeda, Ryu Iida, Akinobu Nishimura, Masaya Tsujii, Shuji Obata, Yuichi Kasai, Atsumasa Uchida, and Akihiro Sudo.
    • Departments of Orthopaedic Surgery, Mie University Graduate School of Medicine, Mie, Japan.
    • Spine. 2013 Feb 1;38(3):E129-36.

    Study DesignImmunohistochemical and biochemical analyses of the rat intervertebral disc (IVD) tissue renin-angiotensin system (tRAS).ObjectiveTo examine the expression and function of tRAS in the rat IVD.Summary Of Background DataAngiotensin II (Ang II), the major effector of tRAS, is a hormone that contributes to inflammation and fibrosis in many organs. The expression of tRAS in the rat IVD has not been determined.MethodstRAS expression in rat and bovine IVDs was examined using real-time polymerase chain reaction (rat) and immunohistochemistry (rat and bovine). Rat annulus fibrosus cells in monolayer culture were used to examine the biological role of tRAS in vitro. The effect of Ang II peptide on extracellular matrix metabolism was assessed by real-time polymerase chain reaction.ResultsmRNA of tRAS components, including angiotensin converting enzyme, Ang II, Ang II receptor type 1, Ang II receptor type 2, and Cathepsin D (a renin-like enzyme), was clearly confirmed by real-time polymerase chain reaction analysis. In rat and bovine annulus fibrosus and nucleus pulposus cells in monolayer culture, immunohistochemical analysis showed that each tRAS component was clearly expressed. In rat IVD tissues, immunoreactivity to each antibody for tRAS components was also observed. Proliferation of rat annulus fibrosus cells was mildly stimulated by Ang II peptide. Ang II peptide also had minor stimulatory effect on the expression of the extracellular matrix components, growth factors, and catabolic proteins.ConclusionOur results demonstrate for the first time that the tRAS components necessary to activate tRAS have been found in the normal rat IVD at both mRNA and protein levels. To elucidate the association between tRAS and the process of IVD degeneration, the expression and function of tRAS in the human degenerated IVD should be examined in a future study.

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