Human mesangial cells secrete a GBM-degrading neutral proteinase and a specific inhibitor.
Human mesangial cells secrete a GBM-degrading neutral proteinase and a specific inhibitor.
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人类肾小球系膜细胞分泌GBM降解中性蛋白酶和特异性抑制剂。
DOI:
10.1038/ki.1989.264
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发表时间:
1989
影响因子:
19.6
通讯作者:
Lovett,DH
中科院分区:
文献类型:
--
作者:
Martin,J;Davies,M;Thomas,G;Lovett,DH
Human mesangial cells secrete a GBM-degrading neutral proteinase and a specific inhibitor. The factors operative during normal and disease states which govern the degradation of the glomerular extracellular matrix (ECM, glomerular basement membrane and mesangial matrix) remain poorly understood. These structures consist primarily of types IV and V collagen, which are highly resistant to the action of classical interstitial collagenases. Here we report that an intrinsic glomerular cell type, the human mesangial cell, secretes: 1) a neutral proteinase with specific activity against type IV basement membrane collagen and, 2) an inhibitory protein with the characteristics of the tissue inhibitor of metalloproteinases (TIMP). The purified enzyme has a neutral pH optimum, consists of a basic (pI 8.4) protein doublet with molecular weight of 66 and 68 kilodaltons, and is inhibited by calcium and zinc chelators. The enzyme degrades both soluble and basement membrane type IV collagen, but does not specifically degrade types I or V collagen or casein. Immunohistochemistry of cultured cells demonstrated homogeneous staining for the neutral proteinase antigen, while the TIMP antigen was detected in fewer than one-third of cultured cells. These findings suggest that the synthesis of these proteins may be independently regulated. The secretion of these factors may play an important role in the turnover of the glomerular ECM under basal or pathologic conditions.
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DOI:
10.1016/s0021-9258(17)44166-4
发表时间:
1983
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
G. Stricklin;H. Welgus
通讯作者:
H. Welgus
DOI:
10.1016/0304-4165(87)90091-2
发表时间:
1987
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
S. Zucker;J. Wieman;R. Lysik;D. Wilkie;N. Ramamurthy;B. Lane
通讯作者:
B. Lane
影响因子:
4.4
作者:
D. Lovett;J. Ryan;R. Sterzel
通讯作者:
R. Sterzel
DOI:
--
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Welgus,HG;Grant,GA;Sacchettini,JC;Roswit,WT;Jeffrey,JJ
通讯作者:
Jeffrey,JJ
DOI:
10.1016/s0174-173x(84)80014-x
发表时间:
1984
期刊:
Collagen and related research
影响因子:
--
作者:
Mainardi,CL;Hibbs,MS;Hasty,KA;Seyer,JM
通讯作者:
Seyer,JM