当前位置： SCI文献检索 > BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS期刊下所有文献 > Extracellular calcium-sensing receptor (CaR) expression and its potential role in parathyroid hormone-related peptide (PTHrP) secretion in the H-500 rat Leydig cell model of humoral hypercalcemia of malignancy.

Extracellular calcium-sensing receptor (CaR) expression and its potential role in parathyroid hormone-related peptide (PTHrP) secretion in the H-500 rat Leydig cell model of humoral hypercalcemia of malignancy.

Abstract：

:Humoral hypercalcemia of malignancy (HHM) occurs when secretion of parathyroid hormone-related peptide (PTHrP) by cancer cells causes hypercalcemia in the absence of skeletal metastases. High extracellular calcium (Ca(2+)(o)) increases secretion of PTH-like bioactivity by rat H-500 leydig cells, a transplantable model of HHM, an action potentially mediated by the Ca(2+)(o)-sensing receptor (CaR). In this study we investigated whether H-500 cells express the CaR and, if so, whether CaR agonists modulate PTHrP secretion. Northern blot analysis and RT-PCR revealed bona fide CaR transcript(s), and immunocytochemistry and Western analysis with a specific anti-CaR antiserum demonstrated CaR protein expression in H-500 cells. Furthermore, high Ca(2+)(o) and neomycin stimulated PTHrP secretion dose-dependently with maximal 2.7- and 3.3-fold increases at 5 mM Ca(2+)(o) and 300 microM neomycin, respectively. Thus in HHM caused by H-500 cells, the CaR could participate in a vicious cycle whereby PTHrP-induced increases in Ca(2+)(o) further stimulate PTHrP release and exacerbate hypercalcemia.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Sanders JL,Chattopadhyay N,Kifor O,Yamaguchi T,Brown EM

doi

10.1006/bbrc.2000.2157

subject

Has Abstract

pub_date

2000-03-16 00:00:00

pages

427-32

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(00)92157-0

journal_volume

269

pub_type

杂志文章

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