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The composition of fluid collected by micropuncture and catheterization from the seminiferous tubules and rete testis of rats

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Summary

Fluid and electrolyte secretion in the rat testis has been studied by micropuncture and catheterization. Three fluids have been collected and analyzed:

  1. 1.

    Rete-testis fluid, obtained by catheterization of the rete testis.

  2. 2.

    Free-flow fluid, obtained by micropuncture of seminiferous tubules.

  3. 3.

    Primary fluid, also obtained by micropuncture but after first filling a tubule segment with oil and allowing new secretion to form and break up the oil column into droplets.

Primary fluid contained: [K]=112±2 (S.E.M.) mEq/l; [Na]=38±3 mEq/l; [Cl]=62±3 mEq/l. The trans-epithelial potential difference was −1.2±0.3 mV (lumen negative).

Free-flow fluid contained: [K]=50±5 mEq/l; [Na]=108±7 mEq/l; [Cl]=120±5 mEq/l; osmolality =337±12 mOsm/KgH 2O. The trans-epithelial potential difference was −7.4±0.5 mV.

Rete-testis fluid contained: [K]=14±1 mEq/l; [Na]=143±4 mEq/l; [Cl]=140±2 mEq/l; [HCO3]=21±5 mEq/l; osmolality=328±23 mOsm/KgH 2O, and high concentrations of free myo-inositol 33.5±1.1 mg-% and of some amino acids, e.g. glycine, proline, lysine, alanine and aspartic acid.

It is proposed that the seminiferous tubules secrete a potassium-rich primary secretion, probably by active potassium and bicarbonate transport, and that the rete testis or tubuli recti produce a sodium-rich secondary secretion in relatively larger volumes. The origin, fate and role of these fluids is discussed.

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Tuck, R.R., Setchell, B.P., Waites, G.M.H. et al. The composition of fluid collected by micropuncture and catheterization from the seminiferous tubules and rete testis of rats. Pflugers Arch. 318, 225–243 (1970). https://doi.org/10.1007/BF00593663

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