GIPR rs10423928 and bone mineral density in postmenopausal women in Shanghai

Effect of incretins on skeletal health

PURPOSE OF REVIEW

The incretin hormones, glucagon like peptide-1 (GLP-1) and gastric inhibitory peptide (GIP), have been shown to decrease bone resorption in humans. The aim of this review is to collate evidence and current advances in the research within the last year on the effect of incretins on skeletal health.

RECENT FINDINGS

Preclinical studies show potential direct beneficial effects on bone by GLP-1 and GIP, however real world epidemiological data show no effects of GLP-1 receptor analogues on fracture risk. This may be due to the weight loss accompanied by GLP-1 treatment which may have detrimental effects on bone. GIP is shown to reduce bone resorption and increase bone formation. Further evidence suggests an additive effect of GIP and glucagon like peptide-2, which could affect bone by different mechanisms.

SUMMARY

GIP and GLP-1 based therapies are more widespread used and may have potential beneficial effects on bone, possibly counterbalanced by weight loss. Long-term effects and side-effects of GIP or GIP/ GLP-2 co-administration remain to be elucidated, and longer term treatment trials are needed.

The Link between Three Single Nucleotide Variants of the GIPR Gene and Metabolic Health

Single nucleotide variants (SNVs) of the GIPR gene have been associated with BMI and type 2 diabetes (T2D), suggesting the role of the variation in this gene in metabolic health. To increase our understanding of this relationship, we investigated the association of three GIPR SNVs, rs11672660, rs2334255 and rs10423928, with anthropometric measurements, selected metabolic parameters, and the risk of excessive body mass and metabolic syndrome (MS) in the Polish population. Normal-weight subjects (n = 340, control group) and subjects with excessive body mass (n = 600, study group) participated in this study. For all participants, anthropometric measurements and metabolic parameters were collected, and genotyping was performed using the high-resolution melting curve analysis. We did not find a significant association between rs11672660, rs2334255 and rs10423928 variants with the risk of being overweight. Differences in metabolic and anthropometric parameters were found for investigated subgroups. An association between rs11672660 and rs10423928 with MS was identified. Heterozygous CT genotype of rs11672660 and AT genotype of rs10423928 were significantly more frequent in the group with MS (OR = 1.38, 95%CI: 1.03–1.85; p = 0.0304 and OR = 1.4, 95%CI: 1.05–1.87; p = 0.0222, respectively). Moreover, TT genotype of rs10423928 was less frequent in the MS group (OR = 0.72, 95%CI: 0.54–0.95; p = 0.0221).