Different muscarinc receptors are involved in the proliferation of murine mammary adenocarcinoma cell lines.

Abstract:

:We described that two different murine mammary adenocarcinoma cell lines, LM3 and LM2 constitutively expressed muscarinic acetylcholine receptors (mAchR). We here demonstrate, by competitive binding experiments with the tritiated muscarinic antagonist quinuclidinyl benzilate that M2 subtype predominates in both tumor cell lines. Concordantly immunoblotting assays indicate that mAchR exhibit the following order of expression: M2 > M4 > M3 > M1 > M5 in both tumor cell lines. Activation of mAchR with carbachol (CARB) increased proliferation in both tumor cell lines in a concentration dependent manner. In LM3 cells CARB promoted proliferation via M3 receptor activation via inositol 1,4,5-triphosphate and nitric oxide production. CARB-induced LM2 cells proliferation needed both M2 and M1 receptor activation, promoting prostaglandin E2 liberation and arginase catabolism respectively, both of them involved in tumor cell growth.

journal_name

Int J Mol Med

authors

Español AJ,Sales ME

subject

Has Abstract

pub_date

2004-02-01 00:00:00

pages

311-7

issue

2

eissn

1107-3756

issn

1791-244X

journal_volume

13

pub_type

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