Summary
Recent advances in the molecular biology of basement membrane components have resulted in new tools for the study of basement membrane metabolism during normal renal development and growth. Collagen IV, the major structural protein of basement membranes, is assembled from at least 5 distinct gene products. mRNA encoding the α1(IV) and α2(IV) chains vary in a precise temporal and spatial fashion during nephronogenesis. Inflammation, such as that observed in antiglomerular basement membrane (GBM) nephritis or in the metabolic or hemodynamic disturbances exemplified by diabetes mellitus, leads to increased steady-state levels of mRNA for these basement membrane components. Increased transcription of these genes may, in part, account for the increase. These two genes are separated by a 130 bp bidirectional promoter which is regulated by sequences contained within the genes. We have directly measured transcription of each gene by the nuclear run-on method and have correlated this with the steady-state mRNA level for each chain. The data suggest that transcriptional attenuation may play an important role in determining the ratio of α1(IV)/α2(IV) mRNA as well as the relative abundance of these mRNA in different tissues. These methods should provide new insights into the mechanism of collagen IV gene expression during renal development and in experimental disease models.
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Killen, P.D., DeMeester, C.A., Long, R.A., O’Brien, E., Grande, J.P. (1991). Regulation of Collagen IV Expression. In: Hatano, M. (eds) Nephrology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-35158-1_116
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DOI: https://doi.org/10.1007/978-3-662-35158-1_116
Publisher Name: Springer, Berlin, Heidelberg
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