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In vitro fertilization in inbred BALB/c mice II: effects of lactate, osmolarity and calcium on in vitro capacitation

Published online by Cambridge University Press:  01 August 2008

Seiji Kito  and
Yuki Ohta
Seiji Kito*
Affiliation:
Research Center for Radiation Protection, Department of Advanced Technologies for Radiation Protection Research, National Institute of Radiological Sciences, 4–9-1 Anagawa, Inage-ku, Chiba 263–8555, Japan. Department of Advanced Technologies for Radiation Protection Research, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba, Japan.
Yuki Ohta
Affiliation:
Science Services, Chiba, Japan.
*
All correspondence to: Seiji Kito, Research Center for Radiation Protection, Department of Advanced Technologies for Radiation Protection Research, National Institute of Radiological Sciences, 4–9-1 Anagawa, Inage-ku, Chiba 263–8555, Japan. Tel: +81 43 206 3059. Fax: +81 43 251 4138. e-mail: [email protected]
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Summary

To elucidate requirements for in vitro sperm capacitation in inbred BALB/c mice, osmolarity, calcium and lactate were optimized using modified simplex optimization medium (mKSOM). Modified human tubal fluid (mHTF), a capacitation-supporting medium, was used as a control. In the first series of experiments, the effects of calcium and osmolarity were studied in the presence of lactate. Although preincubation with ≥5 mM CaCl2 improved fertilization after insemination significantly, it was still significantly lower than incubation with mHTF. To obtain fertilization at the equivalent levels to that of mHTF, isotonic osmolarity (305 mOsmol) was required. Trehalose, an osmotic reagent, could substitute for NaCl partially. In the second series of experiments, the effects of lactate were examined using a concentration of 5 mM calcium and isotonic osmolarity. Preincubation with ≤2.5 mM lactate increased fertilization significantly (>75%), as well as the percentages of B (capacitated) pattern sperm (≥40%) in chlortetracycline (CTC) staining, as compared with incubation in mHTF (46% and 28%, respectively; p < 0.05). In the third series of experiments, the effects of osmolarity and calcium in the absence of lactate were examined. An increase in osmolarity during sperm preincubation increased both fertilization and B-pattern sperm significantly in a dose-dependent manner. Trehalose, sucrose and choline chloride could substitute for NaCl. An increase in CaCl2 concentration during preincubation had no effect on fertilization, but this increase reduced the percentages of B-pattern sperm. In vitro capacitation of inbred BALB/c mice is sensitive to lactate and osmolarity, but that sensitivity for calcium varies depending on the presence or absence of lactate.

Keywords

BALB/c inbred miceCalciumIn vitro capacitationLactateOsmotic pressure
Type
Research Article
Information
Zygote , Volume 16 , Issue 3 , August 2008 , pp. 259 - 270
Copyright
Copyright © Cambridge University Press 2008

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