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AJP - Endocrinology and Metabolism, Vol 267, Issue 2 E260-E267, Copyright © 1994 by American Physiological Society
ARTICLES |
J. M. Burson, G. Aguilera, K. W. Gross and C. D. Sigmund
Department of Medicine, University of Iowa College of Medicine, Iowa City 52242.
At least two distinct genes (AT1A and AT1B) encode type 1 angiotensin II (AT1) receptors in rodents. Receptor binding and Northern blot analysis have clearly demonstrated the presence of AT1 receptors and AT1-receptor mRNA in many tissues but fail to differentiate which type 1 receptor subtype is expressed. A reverse-transcriptase polymerase chain reaction restriction fragment length polymorphism (RT-PCR-RFLP) assay was developed to differentiate the expressed mRNA by subtype. Expression of AT1A was clearly evident in kidney, liver, adrenal gland, ovary, brain, testes, adipose tissue, lung, and heart of adult mice. AT1B was absent from most of these tissues but was detectable in brain, testes, and adrenal gland. No significant differences in expression were evident in kidney, liver, brain, lung, or heart from 16.5- or 18.5-gestation-day fetuses, and only AT1A was evident in placenta. Expression of AT1B was confirmed in adrenal gland, brain, and testes, using a primer set that specifically amplifies only AT1B mRNA. Expression of AT1A and AT1B was also examined in As4.1 cells, a renin-expressing mouse kidney tumoral cell line. Receptor binding and competition assays using AT1- and AT2-receptor antagonists revealed that only AT1 receptors are present on the cell surface. Extremely low levels of AT1-receptor mRNA was detected by Northern blot, and RT-PCR-RFLP analysis revealed that only the AT1A subtype is expressed in this cell line. Despite the high homology between the coding sequence of the AT1A and AT1B genes, they exhibit disparate tissue-specific expression profiles.
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