{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T04:46:36Z","timestamp":1767847596218,"version":"3.49.0"},"reference-count":28,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2006,4,4]],"date-time":"2006-04-04T00:00:00Z","timestamp":1144108800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecular Reproduction Devel"],"published-print":{"date-parts":[[2006,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Concentrations of <jats:sc>D<\/jats:sc>\u2010glucose, <jats:sc>D<\/jats:sc>\u2010fructose and <jats:sc>D<\/jats:sc>\u2010sorbitol were quantified in porcine epididymal fluid by spectrofluorimetric assays and aldose reductase (AR) and sorbitol dehydrogenase (SDH) were located immunohistochemically in the epididymal epithelium. Glucose and fructose concentrations were low (&lt;1 mM) and decreased in the cauda whereas sorbitol concentration (4\u20137 mM) was rather uniform along the duct. AR was luminally located on microvilli in the caput and corpus with less presence distally and was present in the lumen. SDH was present apically and basally in epithelial cells throughout the epididymis and in the lumen. The observations are consistent with diffusion of circulating glucose into the lumen, its conversion via AR to sorbitol which accumulates in the lumen and the action of SDH on sorbitol to produce fructose. Sperm metabolism of glucose and fructose may explain their lower concentrations in the cauda and sorbitol could be a metabolic substrate or osmolyte required for volume regulation. Mol. Reprod. 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