Food Intake Affects Sperm-Egg Fusion Through the GIP/PSG17 Axis in Mice.
Endocrinology
; 158(7): 2134-2144, 2017 07 01.
Article
em En
| MEDLINE
| ID: mdl-28430907
ABSTRACT
In addition to overeating, starvation also reduces fecundity in mammals. However, little is known about the molecular mechanisms linking food intake to fertility, especially in males. Gastric inhibitory polypeptide (GIP), which is released from intestinal K-cells after meal ingestion, stimulates insulin secretion from pancreatic ß-cells through the action of incretin and has several extrapancreatic effects. Here, we identified GIP receptor (Gipr) expression in mouse spermatids. Microarray analysis revealed that pregnancy-specific glycoprotein 17 (Psg17), a potential CD9-binding partner, was significantly decreased in GIP receptor-knockout (Gipr-/-) testes. Glycosylphosphatidylinositol-anchored PSG17 was expressed on the surface of acrosome-reacted sperm, and Gipr-/- sperm led to a lower fertilization rate in vitro, compared with that of Gipr+/+ sperm, both in the absence and presence of the zona pellucida. Plasma GIP concentrations and Psg17 messenger RNA (mRNA) were immediately increased in the testis after a single meal, whereas ingestion of a chronic high-fat diet markedly decreased Gipr and Psg17 mRNA. These results suggest that reduced GIP signaling, by decreased GIP levels or the downregulation of Gipr, is associated with the reduction of fecundity due to starvation or overeating. Thus, proper regulation of GIP signaling in the testis could be a potential unique therapeutic target for male infertility in obese and diabetic individuals.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Proteínas da Gravidez
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Interações Espermatozoide-Óvulo
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Receptores dos Hormônios Gastrointestinais
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Polipeptídeo Inibidor Gástrico
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Glicoproteínas
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Ingestão de Alimentos
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Endocrinology
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Japão