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Beta-Carotene Reduces Body Adiposity of Mice via BCMO1

Lookup NU author(s): Professor Georg Lietz



Evidence from cell culture studies indicates that beta-carotene-(BC)-derived apocarotenoid signaling molecules can modulate the activities of nuclear receptors that regulate many aspects of adipocyte physiology. Two BC metabolizing enzymes, the BC-15,15'-oxygenase (Bcmo1) and the BC-9',10'-oxygenase (Bcdo2) are expressed in adipocytes. Bcmo1 catalyzes the conversion of BC into retinaldehyde and Bcdo2 into beta-10'-apocarotenal and beta-ionone. Here we analyzed the impact of BC on body adiposity of mice. To genetically dissect the roles of Bcmo1 and Bcdo2 in this process, we used wild-type and Bcmo1(-/-) mice for this study. In wild-type mice, BC was converted into retinoids. In contrast, Bcmo1(-/-) mice showed increased expression of Bcdo2 in adipocytes and beta-10'-apocarotenol accumulated as the major BC derivative. In wild-type mice, BC significantly reduced body adiposity (by 28%), leptinemia and adipocyte size. Genome wide microarray analysis of inguinal white adipose tissue revealed a generalized decrease of mRNA expression of peroxisome proliferator-activated receptor gamma (PPAR gamma) target genes. Consistently, the expression of this key transcription factor for lipogenesis was significantly reduced both on the mRNA and protein levels. Despite beta-10'-apocarotenoid production, this effect of BC was absent in Bcmo1(-/-) mice, demonstrating that it was dependent on the Bcmo1-mediated production of retinoids. Our study evidences an important role of BC for the control of body adiposity in mice and identifies Bcmo1 as critical molecular player for the regulation of PPAR gamma activity in adipocytes

Publication metadata

Author(s): Amengual J, Gouranton E, van Helden YGJ, Hessel S, Ribot J, Kramer E, Kiec-Wilk B, Razny U, Lietz G, Wyss A, Dembinska-Kiec A, Palou A, Keijer J, Landrier JF, Bonet ML, von Lintig J

Publication type: Article

Publication status: Published

Journal: PLoS One

Year: 2011

Volume: 6

Issue: 6

Print publication date: 01/06/2011

Date deposited: 04/11/2011

ISSN (print):

ISSN (electronic): 1932-6203

Publisher: Public Library of Science


DOI: 10.1371/journal.pone.0020644


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Funder referenceFunder name
INSERM (France)
Instituto de Salud Carlos III (Spanish Government)
AGL2006-04887/ALISpanish Government (Ministerio de Educacion y Ciencia)
AGL2009-11277/ALISpanish Government (Ministerio de Educacion y Ciencia)