MC4R
Melanocortin receptor 4 (MC4-R)
Publications[править]
MC4R (melanocortin-4 receptor) gene polymorphisms have been associated with serum triglycerides (TG) in Caucasians and Japanese, but no reports are available Chinese. The purpose of this study was to find whether there was an association of rs17782313 polymorphisms at the MC4R gene with serum TG in elderly Chinese. 2,012 over 40 years participated in a cross-sectional study in which their body mass index (BMI), TG, high density lipoprotein-cholesterol (HDL-C), and MC4R rs17782313 polymorphisms were determined. For women, carriers of the T/T genotype had significantly lower serum TG than those with C/C genotype (p=0.006). Carriers of the C/C genotype of this polymorphisms exhibited significantly lower fasting HDL-C levels compared with T/T and T/C genotypes (p=0.025), and increased glycosylated hemoglobin (HbA1c) (p=0.043), but no change in blood pressure. Higher serum TG in carriers of the C/C genotype of MC4R gene remained stable after adjustment for age, smoking, drinking, BMI, waist circumference (WC) and three or more components of the metabolic syndrome (MS) by multivariable linear regression (p=0.01) in women. The carriers of the C/C genotype of MC4R gene showed significantly greater odds ratio for TG than T/C and T/T genotypes, even when adjusted for age, smoking, drinking, BMI and WC in women. The rs17782313 C/C genotype is associated with higher TG levels in older Chinese women.
MeSH Terms
- Aged
- Aging
- Body Mass Index
- China
- Cholesterol, HDL
- Cross-Sectional Studies
- Female
- Genotype
- Glycated Hemoglobin A
- Humans
- Male
- Metabolic Syndrome
- Middle Aged
- Polymorphism, Genetic
- Receptor, Melanocortin, Type 4
- Sex Factors
- Triglycerides
- Waist Circumference
Human behavior is influenced by a number of brain neurotransmitters. Central dopamine, serotonin and melanocortin systems have special importance for male sexual function. We searched for associations between male aging symptoms and polymorphic sites of serotonin (5-HTR1B), melanocortin (MC4R) and dopamine (DRD2, DRD4) receptors. In a population-based sample, genotyping of 5-HTR1B (polymorphism: G861C), MC4R (polymorphisms: C-2745T, Val103Ile), DRD2 (polymorphism: C313T) and DRD4 (polymorphism: 48-bp VNTR) was performed in 387 healthy men. The Aging Males' Symptoms (AMS) scale was used to evaluate specific ailments of aging men. We analyzed answers to questions from the AMS scale. Five points of the questionnaire addressed sexual symptoms of the aging male: feeling of passing one's peak, decrease in beard growth, decrease in ability/frequency to perform sexually, decrease in the number of morning erections, and decrease in sexual desire/libido (lacking pleasure in sex, lacking desire for sexual intercourse). Relations between reported symptoms and variants of the polymorphic sites of the studied genes were assessed. After adjusting for confounding factors (education, arterial hypertension, physical activity, weight, waist circumference) an association between the sexual dimension of AMS and genetic variants of 5-HTR1B G861C (p = 0.04) was observed. Variability of neurotransmitter receptor genes may be associated with sexual symptoms of aging in men.
MeSH Terms
- Adult
- Aged
- Aging
- Genetic Variation
- Humans
- Male
- Middle Aged
- Poland
- Polymorphism, Genetic
- Receptor, Serotonin, 5-HT1B
- Receptors, Neurotransmitter
- Sexual Behavior
- Statistics as Topic