Association of insulin-like growth factor 1 receptor gene rs2229765 polymorphism with osteoporosis in postmenopausal women / 中国组织工程研究

ABSTRACT

BACKGROUND: Insulin-like growth factor 1(IGF-1) plays an important role in regulating osteocyte function and bone metabolism. The association of insulin-like growth factor 1 receptor (IGF-1R) gene polymorphisms with osteoporosis in postmenopausal women has not yet been reported.OBJECTIVE: To investigate the correlation between IGF-1R gene rs2229765 single nucleotide polymorphism and osteoporosis in postmenopausal women.METHODS: IGF-1R gene rs2229765 SNPs were detected using PCR-RFLP in 218 patients with postmenopausal osteoporosis and 270 postmenopausal women with normal bone mineral density. The bone mineral density of the lumbar spine, femoral neck and forearm was determined by dual-energy X-ray absorptiometry. Serum IGF-1 level was investigated by ELISA.RESULTS AND CONCLUSION: The AA genotype (29% vs. 17%, P=0.001) and A allele (51% vs. 40%, P=0.000)distributions of the rs2229765 polymorphism in the osteoporosis group were significantly higher than those in the control group. Compared with GG genotype of rs2229765, AA genotype was significantly associated with an increased risk of osteoporosis (OR=2.12, 95%CI=1.27-3.54, P=0.004). The analysis of serum IGF-1 showed that osteoporotic women with rs2229765AA (P=0.007) and GA (P=0.016) genotype were found to have a lower serum IGF-1 level than osteoporotic women with GG genotype. Our results indicate that the IGF-1R gene rs2229765 polymorphism capable of regulating serum IGF-1 level is associated with postmenopausal osteoporosis.