Tuberal hypothalamic expression of the glial intermediate filaments, glial fibrillary acidic protein and vimentin across the turkey hen ( Meleagris gallopavo ) reproductive cycle: Further evidence for a role of glial structural plasticity in seasonal reproduction

Highlights • Glia regulate tuberal hypothalamic gonadotrophin releasing hormone secretion. • Glial fibrillary acidic protein (GFAP) is reduced in hypothalami of breeding hens. • Hypothalamic vimentin levels are consistent across the breeding cycle. • Median eminence GFAP levels are inversely related to number of vimentin terminals. • Photorefractory turkey hens exhibit reduced glial response to long days.