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Regulation of the apolipoprotein M signaling pathway: a review
1Clinical Medical Research Center, the Third Affiliated Hospital of Soochow University, Changzhou, China.
Abstract:
Apolipoprotein M (apoM), an apolipoprotein predominantly associated with high-density lipoprotein (HDL), is considered a mediator of the numerous roles of HDL, including reverse cholesterol transport, anti-atherosclerotic, anti-inflammatory and anti-oxidant, and mediates pre-β-HDL formation. ApoM expression is known to be regulated by a variety of in vivo and in vitro factors. The transcription factors farnesoid X receptor, small heterodimer partner, liver receptor homolog-1, and liver X receptor comprise the signaling cascade network that regulates the expression and secretion of apoM. Moreover, hepatocyte nuclear factor-1α and c-Jun/JunB have been demonstrated to exert opposing regulatory effects on apoM through competitive binding to the same sites in the proximal region of the apoM gene. Furthermore, as a carrier and modulator of sphingosine 1-phosphate (S1P), apoM binds to S1P within its hydrophobic-binding pocket. The apoM/S1P axis has been discovered to play a crucial role in the apoM signaling pathway through its ability to regulate glucose and lipid metabolism, vascular barrier homeostasis, inflammatory response and other pathological and physiological processes. Using the findings of previous studies, the present review aimed to summarize the regulation of apoM expression by various factors and its role in different physiological and pathological conditions, and provide a new perspective for the further treatment of these diseases.
Insights
Apolipoprotein M (apoM) regulates high-density lipoprotein (HDL) functions and is modulated by various factors. The apoM/sphingosine 1-phosphate (S1P) axis impacts metabolism and inflammation, offering therapeutic targets.
Area of Science:
- Biochemistry
- Molecular Biology
- Cardiovascular Research
Background:
- Apolipoprotein M (apoM) is a key component of high-density lipoprotein (HDL), influencing its diverse functions.
- apoM plays critical roles in reverse cholesterol transport, anti-atherosclerosis, anti-inflammation, and anti-oxidation.
- The apoM/sphingosine 1-phosphate (S1P) axis is integral to physiological processes, including metabolism and vascular homeostasis.
Purpose of the Study:
- To review the regulatory mechanisms governing apoM expression.
- To summarize the physiological and pathological roles of apoM.
- To explore the therapeutic potential of targeting the apoM/S1P axis.
Main Methods:
- Literature review of existing studies on apoM regulation and function.
- Analysis of transcription factor networks influencing apoM expression (FXR, SHP, LHR1, LXR, HNF-1α, c-Jun/JunB).
- Examination of the apoM/S1P interaction and its signaling pathways.
Main Results:
- apoM expression is tightly regulated by multiple transcription factors and signaling pathways.
- apoM, particularly when bound to S1P, modulates glucose and lipid metabolism, vascular barrier integrity, and inflammatory responses.
- The apoM/S1P axis is implicated in various pathological conditions.
Conclusions:
- apoM expression is a complex, multi-factorial process.
- The apoM/S1P axis represents a significant signaling pathway with broad physiological and pathological relevance.
- Understanding apoM regulation and function provides novel avenues for disease treatment.
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