Abstract
Both hypoxia and aging affect the morphology and the function of rat myocardial tissue. Moreover the heart tries to counteract the impaired function by activating specific signalling cascades. Here we report the involvement of CREB protein in “in vivo” response to hypoxic challenge and during aging in rat hearts. CREB is activated in parallel to HIF-1α nuclear translocation in the young after hypoxia exposure followed by reoxygenation, while this kind of response is not so dramatic in the old, neither in terms of CREB activation, neither in terms of HIF-1α expression and translocation, suggesting in the old the existence of an impaired oxygen-sensing mechanism or an adaptation of the cells to hypoxia. Moreover in the young a PKC α/Erk pathway seems to be involved in the activation of HIF-1α along with CREB, suggesting an attempt of the young to counteract the damage evoked by hypoxia, while in the old a PKC α/p38 MAPK/CREB pathway could determine the occurrence of both aging and aged cell hypoxia response.
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This work has been supported by 2005 MIUR 60% Grant Professor A. Antonucci.
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Di Giulio, C., Rapino, M., Zingariello, M. et al. PKC α-mediated CREB activation is oxygen and age-dependent in rat myocardial tissue. Histochem Cell Biol 127, 327–333 (2007). https://doi.org/10.1007/s00418-006-0245-7
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DOI: https://doi.org/10.1007/s00418-006-0245-7