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Peroxisome proliferator-activated receptor alpha controls hepatic heme biosynthesis through ALAS1.

Abstract：

:Heme is an essential prosthetic group of proteins involved in oxygen transport, energy metabolism and nitric oxide production. ALAS1 (5-aminolevulinate synthase) is the rate-limiting enzyme in heme synthesis in the liver and is highly regulated to adapt to the metabolic demand of the hepatocyte. In the present study, we describe human hepatic ALAS1 as a new direct target for the nuclear receptor peroxisome proliferator-activated receptor alpha (PPARalpha). In primary human hepatocytes and in HepG2 cells, PPARalpha agonists induced an increase in ALAS1 mRNA levels, which was abolished by PPARalpha silencing. These effects are mediated by two functional PPAR binding sites at positions -9 and -2.3 kb relative to the ALAS1 transcription start site. PPARalpha ligand treatment also up-regulated the mRNA levels of the genes ALAD (5-aminolevulinate dehydratase), UROS (uroporphyrinogen III synthase), UROD (uroporphyrinogen decarboxylase), CPOX (coproporphyrinogen oxidase) and PPOX (protoporphyrinogen oxidase) encoding for enzymes controlling further steps in heme biosynthesis. In HepG2 cells treated with PPARalpha agonists and in mouse liver upon fasting, the association of PPARalpha, its partner retinoid X receptor, PPARgamma co-activator 1alpha and activated RNA polymerase II with the transcription start site region of all six genes was increased, leading to higher levels of the metabolite heme. In conclusion, these data strongly support a role of PPARalpha in the regulation of human ALAS1 and of five additional genes of the pathway, consequently leading to increased heme synthesis.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Degenhardt T,Väisänen S,Rakhshandehroo M,Kersten S,Carlberg C

doi

10.1016/j.jmb.2009.03.024

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

225-38

issue

2

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(09)00304-0

journal_volume

388

pub_type

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