1 Ocak 2012 Dergi makalesi Açık Erişim

Yildiz-Unal, Aysegul; Korulu, Sirin; Karabay, Arzu

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    <subfield code="a">The calcium-activated proteolytic enzyme calpain is one of the key proteins that can directly or indirectly drive neurons into apoptosis. The indirect way is through cyclin dependent kinase 5 (CDK5), a non-mitotic kinase, which is upregulated through calpain overactivation and followed by a subsequent increase in p53 and active caspase-3 levels under neurodegenerative conditions. The direct way is the upregulation of p53 by calpain itself, since p53 is a substrate for it. SpeedyRINGO is an atypical cell cycle regulator that has been shown to have protective effects in mitotic cells against apoptosis by inhibiting caspase-3 activation when p53 is present. Our aim was to reveal possible protective effects of SpeedyRINGO against calpain-induced caspase-3 activation in neurons which is crucial in terms of providing novel insights in preventing the caspase-3 activation cascade in neurodegeneration. For this reason, mRNA and protein levels were analyzed by qRT-PCR, western blotting, and immunofluorescence. We show that calpain overactivation leads to the upregulation of p53 and a subsequent increase in active caspase-3 level, indicating activation of apoptotic machinery in neurons. This calpain-directed caspase-3 activation upon upregulation of p53 is inhibited by the expression of SpeedyRINGO in rat hippocampal neurons. Therefore, SpeedyRINGO acts as a savior for neurons that are under apoptotisis due to caspase-3 activation.</subfield>
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    <subfield code="a">Yildiz-Unal, Aysegul</subfield>
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    <subfield code="a">10.3233/JAD-2012-120652</subfield>
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    <subfield code="a">Q111qc vSpeedyRINGO Inhibits Calpain-Directed Apoptosis in Neurons</subfield>
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    <subfield code="p">JOURNAL OF ALZHEIMERS DISEASE</subfield>
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    <subfield code="u">Istanbul Tech Univ, Dept Mol Biol &amp; Genet, Fac Sci &amp; Letters, TR-34469 Istanbul, Turkey</subfield>
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