Zn(II) transport and distribution in rat spermatids.
Zn(II) transport and distribution in rat spermatids.
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大鼠精子细胞中 Zn(II) 的转运和分布。
DOI:
10.1152/ajpcell.1993.265.4.c893
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发表时间:
1993
期刊:
影响因子:
--
通讯作者:
Benos,DJ
中科院分区:
文献类型:
--
作者:
Reyes,JG;Arrate,MP;Santander,M;Guzman,L;Benos,DJ
Zn(II) is an essential trace element. In spermatozoa, Zn(II) modulates metabolism and chromatin condensation. The mechanisms of uptake and distribution of this ion in sperm cells have not been explored. In rat spermatids, our results indicate that 1) 65Zn(II) binds with fast kinetics to a labile, presumably extracellular, compartment. This binding is temperature insensitive and not modified by metabolic inhibitors. 2) Entry of 65Zn(II) in the absence of externally added proteins occurs through a mediated transport system that allows exchange to reach steady state in approximately 15 min at 34 degrees C. 3) Upon entering the cells, 65Zn(II) binds tightly to cellular organelles. 4) Exchangeable Zn(II) bound to cytoplasmic proteins plus free intracellular Zn(II) appears to be < 20% of total exchangeable Zn(II). 5) The intracellular exchangeable Zn(II) compartment is decreased by metabolic inhibitors, showing a direct or indirect link between energy metabolism and cellular Zn(II) levels. 6) 65Zn(II) efflux from rat spermatids is a process with a rate constant of 0.16 +/- 0.13 min-1 at 34 degrees C. This exit rate of Zn(II) is likely to be affected by Zn(II) release from cytoplasmic binding sites or organelles.
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影响因子:
2.4
作者:
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通讯作者:
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DOI:
--
发表时间:
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期刊:
Journal of Physiology
影响因子:
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DOI:
--
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