Loxin polymorphism is associated with increased resistin levels and with oxidative status

Area of Science:

• Cardiovascular Genetics
• Molecular Biology
• Inflammation Research

Background:

• The scavenger receptor LOX-1 plays a role in oxidized-low-density lipoprotein (ox-LDL) uptake.
• Genetic variations in the LOX-1 gene (OLR1) may influence inflammatory processes and cardiovascular disease risk.
• Resistin is a pro-inflammatory adipokine implicated in metabolic and cardiovascular conditions.

Purpose of the Study:

• To investigate the association between the LOX-1 IVS4-14 A>G polymorphism and systemic resistin expression.
• To determine if LOX-1 polymorphism modulates inflammation and cardiovascular risk markers.

Main Methods:

• A population-based cohort of 276 men was studied.
• Metabolic and inflammatory markers, including plasma resistin and nitrotyrosine, were measured at baseline and after 6 years.
• The OLR1 IVS4-14 A>G polymorphism was genotyped.

Main Results:

• Individuals homozygous for the G allele (G/G genotype) exhibited significantly higher plasma resistin and nitrotyrosine levels compared to A/A homozygotes.
• Total antioxidant status (TAS) was significantly lower in G/G individuals.
• The G allele showed a significant direct association with both resistin and nitrotyrosine levels.

Conclusions:

• Carriers of the LOX-1 G allele demonstrate enhanced ox-LDL uptake.
• This enhanced uptake is associated with increased oxidative stress (higher nitrotyrosine) and elevated resistin levels.
• These findings suggest a mechanism linking LOX-1 polymorphism to inflammation and cardiovascular risk through macrophage, smooth muscle cell, and monocyte ox-LDL uptake.