Expression of type 1 angiotensin II receptors in human aldosteronomas.

Abstract:

:Type 1 angiotensin II (AII) receptors (AT1 receptors), besides stimulation of aldosterone secretion, seem to transduce the growth factor-like activity of AII on glomerulosa cells. Although a local renin-angiotensin system and AII synthesis have been found in human adrenals and aldosteronomas, it is unclear whether aldosteronomas express AT1 receptors. Utilizing polymerase chain reaction (PCR) and reverse transcription-PCR (RT-PCR) with primers complementary to both genomic and cDNA sequences of human AT1 receptor, we have amplified and cloned a 734 bp fragment of the AT1 coding region. This DNA, after cloning and sequencing, was used for Northern analysis. Total RNA was extracted from 5 non-tumorous adrenals and 5 aldosteronomas. AT1 mRNA (approximately 2.4 kb) was expressed in all the aldosteronomas tested. Densitometric analysis of AT1 signals, corrected by beta actin expression, when compared to non-tumorous adrenals, did not show significant differences. AT1 receptor density and affinity in cell membrane obtained from 9 non-tumorous adrenal cortex and 8 aldosteronomas were also studied. 125I-AII was used as ligand and Dup 753 as AT1 antagonist: AT1 receptor density and affinity were not significantly different in aldosteronomas vs non-tumorous adrenal cortex. In conclusion, the expression of AT1 gene and the formation of an apparently normal receptor suggest that AT1 receptor should have a role in aldosteronoma cell biology.

journal_name

Endocr Res

journal_title

Endocrine research

authors

Sarzani R,Opocher G,Dessì-Fulgheri P,Paci V,Cola G,Rocco S,Vianello B,Mantero F,Rappelli A

doi

10.3109/07435809509030434

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

189-95

issue

1-2

eissn

0743-5800

issn

1532-4206

journal_volume

21

pub_type

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