Abstract
CONTEXT: The vitamin D receptor (VDR) and enzymes involved in activation (CYP2R1, CYP27B1) and inactivation (CYP24A1) of vitamin D are expressed in ovary, testes, and spermatozoa.
OBJECTIVE: Determine responsiveness to 1,25-dihydroxyvitamin D (1,25(OH)2D3) in spermatozoa from normal and infertile men, identify site of exposure and how 1,25(OH)2D3 influences sperm function.
DESIGN: Spermatozoa expressing VDR, CYP2R1, CYP27B1, and CYP24A1 were analyzed in normal and infertile men. 25-hydroxyvitamin D (25-OHD), 24,25-dihydroxyvitamin D (24,25(OH)2D3), and 1,25(OH)2D3 were measured in serum, seminal fluid, cervical secretions and ovarian follicular fluid. 1,25(OH)2D3 was tested on human spermatozoa.
SETTING: Tertiary centre for fertility.
PARTICIPANTS: Protein expression in spermatozoa and semen quality were assessed in 230 infertile and 114 healthy men. Vitamin D metabolites were measured in fluids from 245 men and 13 women, while 74 oocytes and 17 semen donors were used for sperm-function tests.
MAIN OUTCOME MEASURES: VDR and CYP24A1 expressions in spermatozoa, fluid concentrations of 25-OHD, 24,25(OH)2D3 and 1,25(OH)2D3, and 1,25(OH)2D3-induced effects on intracellular calcium concentration ([Ca(2+)]i) and sperm-oocyte binding in vitro.
RESULTS: VDR and CYP24A1 were expressed in >2 fold higher fraction of spermatozoa from normal than infertile men (p<0.01). Concentrations of 25-OHD, 24,25(OH)2D, and 1,25(OH)2D3 were undetectable in seminal fluid but high in ovarian follicular fluid. Follicular concentrations of 1,25(OH)2D3 induced a modest increase in [Ca(2+)]i and sperm-oocyte binding in vitro (p<0.05).
CONCLUSION: Presence of VDR and CYP24A1 mainly in spermatozoa of higher quality supports that 1,25(OH)2D3 available in the female reproductive tract may promote selection of the best gametes for fertilization.
| Original language | English |
|---|---|
| Journal | The Journal of clinical endocrinology and metabolism |
| Volume | 102 |
| Issue number | 3 |
| Pages (from-to) | 950-61 |
| ISSN | 0021-972X |
| DOIs | |
| Publication status | Published - 2017 |
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