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© Fabrice Chrétien with Ultrapole, colorized by Jean-Marc Panaud
Cellule souche (en jaune) de muscle squelettique partiellement recouverte par la membrane basale, migrant sur une fibre musculaire (en bleu).
Publication : FEBS letters

Expression and secretion of human apolipoprotein A-I in the heart

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in FEBS letters - 16 Jan 2004

Baroukh N, Lopez CE, Saleh MC, Recalde D, Vergnes L, Ostos MA, Fiette L, Fruchart JC, Castro G, Zakin MM, Ochoa A

Link to Pubmed [PMID] – 14741338

FEBS Lett. 2004 Jan;557(1-3):39-44

Various studies have correlated apolipoprotein (apo) A-I, the major component high-density lipoprotein, with protection against development of cardiovascular disease. Although apoA-I expression has been previously detected in the liver and intestine, we have discovered that the human apoA-I gene is also expressed in the heart. Using transgenic (Tg) mice generated with the human apoA-I/C-III/A-IV gene cluster and Tg mice produced with just the 2.2 kb human apoA-I gene, we have detected significant levels of apoA-I expression in the heart. Furthermore, the detection of apoA-I expression in the hearts of human apoA-I Tg mice indicates that the minimal regulatory elements necessary for cardiac expression of the gene are located near its coding sequence. To determine if the apoA-I gene is also expressed in the human heart, similar analyses were performed, where apoA-I expression was found in both adult and fetal hearts. Furthermore in-depth investigation of the various regions of human and Tg mouse hearts revealed that the apoA-I mRNA was present in the ventricles and atria, but not in the aorta. In situ hybridization of Tg mouse hearts revealed that apoA-I expression was restricted to the cardiac myocyte cells. Finally, heart explants and cardiac primary culture experiments with Tg mice showed secretion of particles containing the human apoA-I protein, and metabolic labeling experiments have also detected a 28 kDa human apoA-I protein secreted from the heart. From these novel findings, new insights into the role and function of apoA-I can be extrapolated.

http://www.ncbi.nlm.nih.gov/pubmed/14741338