Abstract
Previously, we have purified three distinct DNases from spermatozoa of sea urchin Strongylocentrotus intermedius and we suppose the role of Ca2+, Mg2+-dependent DNase (Ca, Mg-DNase) in apoptosis of spermatozoa. Two-headed sphingolipid rhizochalin (Rhz) induced characteristic apoptotic nuclear chromatin changes, internucleosomal DNA cleavage, and activation of caspase-9, caspase-8, and caspase-3 in spermatozoa as was shown by fluorescence Hoechst 33342/PI/FDA analysis, DNA fragmentation assay, and fluorescence caspase inhibitors FAM-LEHD-fmk, FAM-IETD-fmk, and FAM-DEVD-fmk, respectively. Inhibitor of caspase-3 z-DEVD-fmk subdued Rhz-induced internucleosomal ladder formation, which confirmed the major role of caspase-3 in apoptotic DNA cleavage probably through Ca, Mg-DNase activation. Participation of sea urchin Ca, Mg-DNase in apoptosis of spermatozoa was demonstrated by ions Zn2+ blocking of Rhz-induced DNA fragmentation due to direct inhibition of the Ca, Mg-DNase and internucleosomal cleavage of HeLa S and Vero E6 cell nuclei chromatin by highly purified Ca, Mg-DNase.
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Abbreviations
- EGTA:
-
Ethyleneglycoltetraacetic acid
- EDTA:
-
Ethylenediaminetetraacetic acid
- DTT:
-
Dethiothreithol
- PMSF:
-
Phenylmethylsulfonyl fluoride
- SDS:
-
Sodium dodecyl sulfate
- PI:
-
Propidium iodide
- FDA:
-
Fluorescein diacetate
- FAM-LEHD-fmk:
-
Carboxyfluorescein analog of benzyloxycarbonyl-Leu-Glu-His-Asp(OMe) fluoromethyl ketone (z-LEHD-fmk)
- FAM-IETD-fmk:
-
Carboxyfluorescein analog of benzyloxycarbonyl-Ile-Glu-Thr-Asp(OMe)fluoromethyl ketone (z-IETD-fmk)
- FAM-DEVD-fmk:
-
Carboxyfluorescein analog of benzyloxycarbonyl-Asp(OMe)-Glu(O-Me)-Val-Asp(O-Me) fluoromethyl ketone (z-DEVD-fmk)
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Acknowledgments
This work was supported by RFBR Grant No. 08-08-00975 and the grant of the Russian Academy of Sciences on Program of Fundamental Research “Physicochemical biology FEB RAS” (No. 09-I-П22-05) and RFBR Grant 09-04-00015-a.
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Juriy T. Sibirtsev and Valeria V. Shastina have contributed equally.
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Sibirtsev, J.T., Shastina, V.V., Menzorova, N.I. et al. Ca2+, Mg2+-dependent DNase Involvement in Apoptotic Effects in Spermatozoa of Sea Urchin Strongylocentrotus intermedius Induced by Two-Headed Sphingolipid Rhizochalin. Mar Biotechnol 13, 536–543 (2011). https://doi.org/10.1007/s10126-010-9324-9
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DOI: https://doi.org/10.1007/s10126-010-9324-9