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Energy status determines hindbrain signal transduction pathway transcriptional reactivity to AMPK in the estradiol-treated ovariectomized female rat.

Abstract：

:Dorsal vagal complex (DVC) AMPK regulation of food intake in the estradiol-treated ovariectomized (OVX) female rat is energy state-dependent. Here, RT-PCR array technology was used to identify estradiol-sensitive AMPK-regulated DVC signal transduction pathways that exhibit differential reactivity to sensor activation during energy balance versus imbalance. The AMP mimetic AICAR correspondingly reduced or stimulated cDVC phosphoAMPK (pAMPK) and estrogen receptor-beta (ERβ) proteins in full-fed (F) versus 12-h food-deprived (D) estradiol-treated ovariectomized (OVX) rats, but elevated ER-alpha (ERα) in F only. Estradiol suppressed DVC ERβ protein and hypoxia, NFκB, STAT3, STAT6, and Hedgehog signaling pathway marker genes against oil-implanted OVX controls. F+(A)ICAR and D+(S)aline groups each exhibited further inhibition of NFκB, STAT3, and Hedgehog pathway genes, and diminished PPAR, Notch, and STAT5 transcripts versus F+S. Conversely, genes in these six pathways were up-regulated by AICAR treatment of D. Results show that in this animal model, acute AMP augmentation or feeding cessation each inhibit both pAMPK and ERβ expression, but in combination increase these protein profiles. pAMPK protein and DVC TNF (NFκB), SOCS3 (JAK/STAT), WNT6 (Hedgehog), and FABP1 (PPAR) mRNAs were down- or upregulated in parallel by AICAR in F versus D states, respectively. Further research is needed to determine the impact of ERβ on opposing directionality of these responses, and to characterize the role of the aforementioned signaling pathways in hyperphagic responses in the female to AICAR-induced DVC AMPK activation during acute interruption of feeding.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Ibrahim BA,Alenazi FSH,Briski KP

doi

10.1016/j.neuroscience.2014.10.068

subject

Has Abstract

pub_date

2015-01-22 00:00:00

pages

888-899

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(14)00949-X

journal_volume

284

pub_type

杂志文章

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