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10.1074/jbc.M116.713941

http://scihub22266oqcxt.onion/10.1074/jbc.M116.713941
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C4882447!4882447!27044749
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suck abstract from ncbi


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pmid27044749      J+Biol+Chem 2016 ; 291 (22): 11800-8
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  • Hypercapnia Suppresses the HIF-dependent Adaptive Response to Hypoxia* #MMPMID27044749
  • Selfridge AC; Cavadas MAS; Scholz CC; Campbell EL; Welch LC; Lecuona E; Colgan SP; Barrett KE; Sporn PHS; Sznajder JI; Cummins EP; Taylor CT
  • J Biol Chem 2016[May]; 291 (22): 11800-8 PMID27044749show ga
  • Molecular oxygen and carbon dioxide are the primary gaseous substrate and product of oxidative metabolism, respectively. Hypoxia (low oxygen) and hypercapnia (high carbon dioxide) are co-incidental features of the tissue microenvironment in a range of pathophysiologic states, including acute and chronic respiratory diseases. The hypoxia-inducible factor (HIF) is the master regulator of the transcriptional response to hypoxia; however, little is known about the impact of hypercapnia on gene transcription. Because of the relationship between hypoxia and hypercapnia, we investigated the effect of hypercapnia on the HIF pathway. Hypercapnia suppressed HIF-? protein stability and HIF target gene expression both in mice and cultured cells in a manner that was at least in part independent of the canonical O2-dependent HIF degradation pathway. The suppressive effects of hypercapnia on HIF-? protein stability could be mimicked by reducing intracellular pH at a constant level of partial pressure of CO2. Bafilomycin A1, a specific inhibitor of vacuolar-type H+-ATPase that blocks lysosomal degradation, prevented the hypercapnic suppression of HIF-? protein. Based on these results, we hypothesize that hypercapnia counter-regulates activation of the HIF pathway by reducing intracellular pH and promoting lysosomal degradation of HIF-? subunits. Therefore, hypercapnia may play a key role in the pathophysiology of diseases where HIF is implicated.
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