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Retinoic acid promotes proliferation of chicken primordial germ cells via activation of PI3K/Akt-mediated NF-κB signalling cascade.

Abstract：

:As embryonic progenitors for the gametes, PGCs (primordial germ cells) proliferate and develop under strict regulation of numerous intrinsic and external factors. As the most active natural metabolite of vitamin A, all-trans RA (retinoic acid) plays pivotal roles in regulating development of various cells. The proliferating action of RA on PGCs was investigated along with the intracellular PI3K (phosphoinositide 3-kinase)/Akt (protein kinase B; also known as Akt)-mediated NF-κB (nuclear factor κB) signalling cascade. The results show that RA significantly promoted PGC proliferation in a dose- and time-dependent manner, confirmed by BrdU (bromodeoxyuridine) incorporation and cell cycle analysis. However, this promoting effect was attenuated by sequential inhibitors of LY294002 for PI3K, KP372-1 for Akt and SN50 for NF-κB respectively. Western blot analysis showed increased Akt phosphorylation (Ser473) of PGCs after stimulation with RA, but this was abolished by LY294002 or KP372-1. Treatment with RA increased expression of NF-κB and decreased IκBα (inhibitory κBα) expression, which were inhibited by SN50. Blockade of PI3K or Akt activity inhibited NF-κB translocation from the cytoplasm to the nucleus. Finally, mRNA expression of cell cycle regulating genes [cyclin D1 and E, CDK6 (cyclin-dependent kinase 6) and CDK2] was up-regulated in the RA-treated cells. This stimulation was also markedly retarded by combined treatment with LY294002, KP372-1 and SN50. These results suggest that RA activates the PI3K/Akt and NF-κB signalling cascade to promote proliferation of the cultured chicken PGCs.

journal_name

Cell Biol Int

journal_title

Cell biology international

authors

Yu M,Ge C,Zeng W,Mi Y,Zhang C

doi

10.1042/CBI20110542

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

705-12

issue

8

eissn

1065-6995

issn

1095-8355

pii

CBI20110542

journal_volume

36

pub_type

杂志文章

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