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Arginine vasopressin inhibition of cyclin D1 gene expression blocks the cell cycle and cell proliferation in the mouse Y1 adrenocortical tumor cell line.

Abstract：

:Arginine vasopressin (AVP) is a nonapeptide long known as an endocrine and paracrine regulator of important systemic functions, namely, vasoconstriction, gluconeogenesis, corticosteroidogenesis, and excretion of water and urea. Here we report, for the first time, that AVP specifically inhibits expression of the cyclin D1 gene, leading to cell cycle blockage and halting cell proliferation. In G0/G1-arrested mouse Y1 adrenocortical tumor cells, maintained in serum-free medium (SFM), AVP mimics FGF2, promoting rapid ERK1/2 activation (5 min) followed by c-Fos protein induction (2 h). PKC inhibitor Go6983 and PI3K inhibitors wortmannin and LY294002 all inhibit ERK1/2 activation by AVP, but not by FGF2. Thus, AVP and FGF2 concur to activate ERK1/2 by different regulatory pathways. However, AVP is not a mitogenic factor for Y1 cells. On the contrary, AVP strongly antagonizes FGF2 late induction (2-5 h) of the cyclin D1 gene, down-regulating both cyclin D1 mRNA and protein. AVP inhibition of cyclin D1 expression is sufficient to block G1 phase progression and cell entry into the S phase, monitored by BrdU nuclear labeling. In addition, AVP completely inhibits proliferation of Y1 cells in 10% fetal calf serum (10% FCS) medium. On the other hand, ectopic expression of the cyclin D1 protein renders Y1 cells resistant to AVP for both entry into the S phase in SFM and continuous proliferation in 10% FCS medium. In conclusion, inhibition of cyclin D1 expression by AVP is an efficient mechanism of cell cycle blockage and consequent proliferation inhibition in Y1 adrenocortical cells.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Schwindt TT,Forti FL,Juliano MA,Juliano L,Armelin HA

doi

10.1021/bi026807g

subject

Has Abstract

pub_date

2003-02-25 00:00:00

pages

2116-21

issue

7

eissn

0006-2960

issn

1520-4995

journal_volume

42

pub_type

杂志文章

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