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Journal of Histochemistry and Cytochemistry
Volume 52 (5): 683-692, 2004
Copyright ©The Histochemical Society, Inc.

Tensin Is Expressed in Glomerular Mesangial Cells and Is Related to Their Attachment to Surrounding Extracellular Matrix

Hisatsugu Takahara, Isao Shirato, Katsuhiko Asanuma, Michifumi Yamashita, Yukihiko Takeda and Yasuhiko Tomino

Division of Nephrology, Department of Internal Medicine, Juntendo University School of Medicine, Tokyo, Japan

Correspondence to: Yasuhiko Tomino, Div. of Nephrology, Dept. of Internal Medicine, Juntendo U. School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan. E-mail: yasu{at}med.juntendo.ac.jp

Glomerular expression of tensin was immunohistochemically studied in normal and diseased rat kidneys to determine whether tensin might be related to specific binding in individual glomerular cells. Normal rat kidneys displayed an intense immunofluorescence reaction for tensin along the basal aspects of proximal and distal tubule cells and parietal epithelial cells of Bowman's capsules. In glomeruli, a positive reaction for tensin was detected only in the mesangial areas. Immunoelectron microscopy revealed a positive reaction in the mesangial cell (MC) processes. RT-PCR and immunoprecipitation demonstrated mRNA and protein levels of tensin in cultured rat MCs. Mesangial tensin expression was decreased when the mesangium was injured by Habu snake venom. During the regenerative process after mesangiolysis, tensin expression was not detected in early-phase proliferating MCs that did not have extracellular matrix (ECM). The expression of tensin recovered in late-phase proliferating MCs, which became attached to regenerated ECM. It appears that tensin is related to MC attachment to surrounding ECM, which suggests that signal transduction regulated by tensin may be related to a specific mechanism of MC matrix regeneration. Furthermore, tensin can act as a marker for rat MCs because the expression of tensin was detected only in MCs in glomeruli. (J Histochem Cytochem 52:683–691, 2004)

Key Words: tensin • mesangial cell • mesangial cell marker • Habu snake venom nephritis


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