Immunohistochemical detection of GHRH and its receptor splice variant 1 in primary human breast cancers.

Abstract:

OBJECTIVE:GHRH is secreted by the hypothalamus and, upon binding to specific GHRH receptors in the pituitary, stimulates growth hormone (GH) production and release from the pituitary. In addition to this neuroendocrine action, accumulated evidence implies additional roles for GHRH in carcinogenesis in non-pituitary tissues. In vitro and in vivo studies have shown that splice variant 1 (SV1) of the GHRH receptor, which is widely expressed in non-pituitary tissues and cancers, can mediate the proliferative effects of GHRH. The aim of the present study was to investigate the operation of an autocrine stimulatory loop between GHRH and SV1 in primary breast tumors. DESIGN:Fifty-three primary breast tumors were evaluated for GHRH and SV1 expression. METHODS:Expression of GHRH and SV1 was assessed by immunohistochemistry using anti-GHRH SV95 and anti-SV1 2317/5 polyclonal antibodies. RESULTS:About 40% of the specimens tested express GHRH and/or SV1 (approx. 25% each), while in 35% of these positive specimens co-expression of these antigens was detected (P<0.01). Furthermore, a correlation of GHRH, but not SV1, expression was detected in lobular compared with ductal carcinomas. CONCLUSIONS:These results constitute the first demonstration for the expression of GHRH and SV1 in primary breast cancers, and provide evidence for the operation of an autocrine stimulatory loop between GHRH and SV1 in primary cancers. Our findings indicate that GHRH analogs could have diagnostic and therapeutic applications for the management of breast cancer.

journal_name

Eur J Endocrinol

authors

Chatzistamou I,Schally AV,Kiaris H,Politi E,Varga J,Kanellis G,Kalofoutis A,Pafiti A,Koutselini H

doi

10.1530/eje.0.1510391

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

391-6

issue

3

eissn

0804-4643

issn

1479-683X

journal_volume

151

pub_type

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