Ontology type: schema:ScholarlyArticle Open Access: True
2008-06
AUTHORSJames J. Kohler, Seyed H. Hosseini, Elgin Green, Amy Hoying-Brandt, Ioan Cucoranu, Chad P. Haase, Rodney Russ, Jaya Srivastava, Kristopher Ivey, Tomika Ludaway, Victor Kapoor, Allison Abuin, Alexsey Shapoval, Robert Santoianni, Ann Saada, Orly Elpeleg, William Lewis
ABSTRACTMitochondrial (mt) DNA biogenesis is critical to cardiac contractility. DNA polymerase gamma (Pol gamma) replicates mtDNA, whereas thymidine kinase 2 (TK2) monophosphorylates pyrimidines intramitochondrially. Point mutations in POLG and TK2 result in clinical diseases associated with mtDNA depletion and organ dysfunction. Pyrimidine analogs (NRTIs) inhibit Pol gamma and mtDNA replication. Cardiac "dominant negative" murine transgenes (TGs; Pol gamma Y955C, and TK2 H121N or I212N) defined the role of each in the heart. mtDNA abundance, histopathological features, histochemistry, mitochondrial protein abundance, morphometry, and echocardiography were determined for TGs in "2 x 2" studies with or without pyrimidine analogs. Cardiac mtDNA abundance decreased in Y955C TGs ( approximately 50%) but increased in H121N and I212N TGs (20-70%). Succinate dehydrogenase (SDH) increased in hearts of all mutants. Ultrastructural changes occurred in Y955C and H121N TGs. Histopathology demonstrated hypertrophy in H121N, LV dilation in I212N, and both hypertrophy and dilation in Y955C TGs. Antiretrovirals increased LV mass ( approximately 50%) for all three TGs which combined with dilation indicates cardiomyopathy. Taken together, these studies demonstrate three manifestations of cardiac dysfunction that depend on the nature of the specific mutation and antiretroviral treatment. Mutations in genes for mtDNA biogenesis increase risk for defective mtDNA replication, leading to LV hypertrophy. More... »
PAGES57
http://scigraph.springernature.com/pub.10.1007/s12012-008-9015-1
DOIhttp://dx.doi.org/10.1007/s12012-008-9015-1
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/18446447
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