Cardiotoxic Effects of Short-Term Doxorubicin Administration : Involvement of Connexin 43 in Calcium Impairment
Pecoraro, Michela (University of Salerno)
Rodríguez-Sinovas, Antonio (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Marzocco, Stefania (University of Salerno)
Ciccarelli, Michele (University of Salerno)
Iaccarino, Guido (University of Salerno)
Pinto, Aldo (University of Salerno)
Popolo, Ada (University of Salerno)
Universitat Autònoma de Barcelona

Data:	2017
Resum:	The use of Doxorubicin (DOXO), a potent antineoplastic agent, is limited by the development of cardiotoxicity. DOXO-induced cardiotoxicity is multifactorial, although alterations in calcium homeostasis, seem to be involved. Since even the Connexin43 (Cx43) plays a pivotal role in these two phenomena, in this study we have analyzed the effects of DOXO on Cx43 expression and localization. Damage caused by anthracyclines on cardiomyocytes is immediate after each injection, in the present study we used a short-term model of DOXO-induced cardiomyopathy. C57BL/6j female mice were randomly divided in groups and injected with DOXO (2 or 10 mg/kg i. p. ) for 1-3 or 7 days once every other day. Cardiac function was assessed by Echocardiography. Sarco/endoplasmic reticulum Ca 2+ -ATPase (SERCAII) and phospholamban (PLB) expression were assessed by Western blot analysis, intracellular [Ca 2+ ] were detected spectrofluorometrically by means of Fura-2 pentakis (acetoxymethyl) ester (FURA-2AM), and Cx43 and pCx43 expression and localization was analyzed by Western blot and confirmed by immunofluorescence analysis. DOXO induces impairment in Ca 2+ homeostasis, already evident after a single administration, and affects Cx43 expression and localization. Our data suggest that DOXO-induced alterations in Ca 2+ homeostasis causes in the cells the induction of compensatory mechanisms until a certain threshold, above which cardiac injury is triggered.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Connexin 43 ; Doxorubicin ; Cardiotoxicity ; Calcium homeostasis ; Mitochondria
Publicat a:	International journal of molecular sciences, Vol. 18 (october 2017) , ISSN 1422-0067

DOI: 10.3390/ijms18102121
PMID: 29019935

12 p, 1.9 MB

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