Abstract:
:Lactogen-dependent Nb2 lymphoma cells, widely employed for studying prolactin (PRL) mitogenic mechanisms, are also useful for investigations of apoptosis in T-lineage lymphocytes. Utilizing PRL-dependent Nb2-11 cultures, apoptosis-regulatory genes were evaluated for participation in dexamethasone- (DEX) provoked cell death or its inhibition by PRL. Treatment of lactogen-starved, G1-arrested Nb2-11 cells with DEX (100 nM) activated apoptosis within 12 h evaluated by flow cytometric analysis of fragmented DNA. This effect was not associated with altered expression of bcl-2, bax, or pim-1. PRL (10 ng/mL), coincubated with DEX-treated cells, completely blocked DEX-induced apoptosis. This inhibition was associated with increased expression of bcl-2 and pim-1 mRNAs, genes reported to suppress apoptosis, within 2-6 h after addition of the hormone. Moreover, the increased transcription of bcl-2 and pim-1 was coupled to increases in their protein levels. The results suggest that bcl-2, bax, and pim-1 do not play a critical role in DEX-induced apoptosis in Nb2 cells. However, expression of bcl-2, together with pim-1, may have a role in mediating the antiapoptotic actions of PRL.
journal_name
Endocrinejournal_title
Endocrineauthors
Krumenacker JS,Buckley DJ,Leff MA,McCormack JT,de Jong G,Gout PW,Reed JC,Miyashita T,Magnuson NS,Buckley ARdoi
10.1385/ENDO:9:2:163subject
Has Abstractpub_date
1998-10-01 00:00:00pages
163-70issue
2eissn
1355-008Xissn
1559-0100pii
ENDO:9:2:163journal_volume
9pub_type
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