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Apolipoprotein M

Guanghua Luo1, Xiaoying Zhang, Peter Nilsson-Ehle

  • 1Department of Clinical Chemistry, Institute of Laboratory Medicine, University Hospital of Lund, S-221 85 Lund, Sweden. shineroar@163.com

Lipids in Health and Disease
|October 6, 2004
PubMed

Insights

Apolipoprotein M (apoM) is a protein found in human plasma, primarily linked to HDL. Its expression is regulated by factors like HNF-1alpha and leptin, impacting conditions such as MODY3 and obesity.

Area of Science:

  • Lipid metabolism and lipoprotein research
  • Gene expression and regulation
  • Human genetics and disease

Background:

  • Apolipoprotein M (apoM) is a 26-kDa protein primarily associated with high-density lipoprotein (HDL) in human plasma.
  • A small fraction of apoM is also found in triglyceride-rich lipoproteins (TGRLP) and low-density lipoproteins (LDL).
  • The human apoM gene is located on chromosome 6, and the protein belongs to the lipocalin superfamily.

Purpose of the Study:

  • To investigate the tissue-specific expression of apolipoprotein M.
  • To identify regulatory factors influencing apoM gene expression.
  • To explore the potential role of apoM in metabolic diseases like MODY3 and obesity.

Main Methods:

  • Human tissue expression array analysis to determine apoM expression sites.
  • In situ hybridization to localize apoM mRNA in hepatocytes and kidney tubule cells.
  • Analysis of apoM expression in genetically modified mouse models (apoA-I deficient, HNF-1alpha deficient, leptin deficient, leptin receptor deficient).

Main Results:

  • ApoM is predominantly expressed in the liver and kidney, specifically in hepatocytes and kidney tubule epithelial cells.
  • Platelet activating factor (PAF), transforming growth factors (TGF), insulin-like growth factor (IGF), and leptin can regulate apoM expression.
  • ApoM expression is significantly reduced in apoA-I deficient, HNF-1alpha deficient, leptin deficient (ob/ob), and leptin receptor deficient (db/db) mice.
  • Mutations in Hepatocyte nuclear factor-1alpha (HNF-1alpha), associated with MODY3, lead to reduced serum apoM levels.
  • Plasma apoM concentration correlates positively with leptin levels in obese individuals.

Conclusions:

  • Apolipoprotein M expression is tightly regulated by specific transcription factors and hormones.
  • ApoM plays a role in lipid metabolism and may be implicated in the pathogenesis of MODY3 and obesity.
  • Further research into apoM's function could offer insights into metabolic disease treatment.

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