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2017 ; 7
(1
): 10121
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Hypoxia induces cancer-associated cAMP/PKA signalling through HIF-mediated
transcriptional control of adenylyl cyclases VI and VII
#MMPMID28860539
Simko V
; Iuliano F
; Sevcikova A
; Labudova M
; Barathova M
; Radvak P
; Pastorekova S
; Pastorek J
; Csaderova L
Sci Rep
2017[Aug]; 7
(1
): 10121
PMID28860539
show ga
Hypoxia is a phenomenon often arising in solid tumours, linked to aggressive
malignancy, bad prognosis and resistance to therapy. Hypoxia-inducible factor-1
has been identified as a key mediator of cell and tissue adaptation to hypoxic
conditions through transcriptional activation of many genes involved in glucose
metabolism and other cancer-related processes, such as angiogenesis, cell
survival and cell invasion. Cyclic adenosine 3'5'-monophosphate is one of the
most ancient and evolutionarily conserved signalling molecules and the cAMP/PKA
signalling pathway plays an important role in cellular adaptation to hypoxia. We
have investigated possible new mechanisms behind hypoxic activation of the
cAMP/PKA pathway. For the first time, we have shown that hypoxia induces
transcriptional up-regulation of the system of adenylyl cyclases, enzymes
responsible for cAMP production, in a panel of carcinoma cell lines of various
origin. Our data prove functional relevance of the hypoxic increase of adenylyl
cyclases VI and VII at least partially mediated by HIF-1 transcription factor. We
have identified adenylyl cyclase VI and VII isoforms as mediators of cellular
response to hypoxia, which led to the elevation of cAMP levels and enhanced PKA
activity, with an impact on cell migration and pH regulation.
|*Signal Transduction
[MESH]
|Adenylyl Cyclases/metabolism
[MESH]
|Cyclic AMP-Dependent Protein Kinases/*metabolism
[MESH]