Adrenomedullin (AM) and receptor-activity-modifying proteins in glomeruli with Thy.1 glomerulonephritis.

Abstract:

BACKGROUND:Adrenomedullin (AM) has antiproliferative and proapoptotic effects on mesangial cells in culture, but the regulation of AM and its receptors in glomeruli with glomerulonephritis have not been clarified. METHODS:We examined sequential changes in the mRNA expression of AM and its receptors (receptor-activity-modifying proteins; RAMPs), and AM production in the glomeruli of Thy.1 glomerulonephritis, using quantitative reverse transcription-polymerase chain reaction (RT-PCR) and immunoradiometric assay (IRMA). RESULTS:Both the mRNA and the protein levels of AM in glomeruli isolated from rats 7 days after injection with anti-thymocyte serum (ATS), when mesangial cell proliferation peaked, were unchanged compared with those in control rats. However, on day 14, when almost all glomeruli had appeared to return to normal, AM mRNA expression was significantly increased (day 14 vs control: 51.2 +/- 9.1 vs 28.4 +/- 7.1 (mmol/mol glyceraldehyde-3-phosphate dehydrogenase; GAPDH); P < 0.05), as was the AM concentration (12.0 +/- 0.8 vs 8.4 +/- 0.4 fmol/10(4) glomeruli; P < 0.01). Subsequently, by 28 days after ATS injection, both levels decreased to the control ones. The mRNA expression of AM and RAMP2, in the glomeruli of Thy.1 glomerulonephritis changed similarly over time. Immunohistochemical staining revealed that AM production in mesangial cells was increased predominantly on day 14. CONCLUSIONS:AM and RAMP increased during the reso-lution phase of increased mesangial proliferation in Thy.1 glomerulonephritis, but not during the mesangial proliferative phase. Considering the antiproliferative and proapoptotic effects of AM, its action on mesangial cells may be related to the amelioration of glomerulonephritis.

journal_name

Clin Exp Nephrol

authors

Matsumoto M,Fujimoto S,Iwatsubo S,Sato Y,Hara S,Kitamura K,Eto T

doi

10.1007/s10157-004-0309-8

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

316-21

issue

4

eissn

1342-1751

issn

1437-7799

journal_volume

8

pub_type

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