Abstract：
:The tetrapeptide N-Acetyl-Seryl-Aspartyl-Lysyl-Proline (AcSDKP) is a natural regulator of hematopoietic stem cell proliferation. The present study was aimed at investigating the presence and the role of AcSDKP in rat testis. Specific immunoreactivity was always observed in the interstitial tissue at all stages of testicular development and in elongated spermatids at 45 days of age and in adults. In accordance with the interstitial labeling, high AcSDKP levels were detected in Leydig cell and testicular macrophage culture media and cell extracts, as well as in the testicular interstitial fluid (TIF). Much lower concentrations were found in peritubular cells and Sertoli cells cultures, whereas very low concentrations were present in cultured spermatocytes and spermatids. In contrast to the slight degradation rate of AcSDKP observed in the spermatocyte and spermatid culture media, no catabolism of the peptide was seen in testicular somatic cell culture medium. Furthermore, the degradation rate of AcSDKP was much lower in TIF than in peripheral blood plasma. Despite the very strong evidence indicating that Leydig cells and testicular macrophages produce AcSDKP, the selective destruction of these cells did not result in any change in AcSDKP levels in TIF or in plasma. This suggests a compensatory mechanism ensuring constant levels of the peptide in TIF when interstitial cells are absent. Finally, in vitro, in the presence of AcSDKP, significantly more [(3)H]thymidine incorporation was found in A spermatogonia. In conclusion, this study establishes the presence of very high concentrations of AcSDKP in rat testis and demonstrates its Leydig cell and testicular macrophage origin. The presence of AcSDKP in the TIF and its stimulatory effect on thymidine incorporation in spermatogonia very strongly suggest its implication in the paracrine control of spermatogenesis.
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Stéphan J,Melaine N,Ezan E,Hakovirta H,Maddocks S,Toppari J,Garnier D,Wdzieczak-Bakala J,Jégou Bkeywords:
subject
Has Abstractpub_date
2000-01-01 00:00:00pages
113-21eissn
0021-9533issn
1477-9137journal_volume
113 ( Pt 1)pub_type
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journal_title：Journal of cell science
pub_type： 杂志文章
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journal_title：Journal of cell science
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abstract：:The nonclaret disjunctional (ncd) protein is a kinesin-related microtubule motor protein that is encoded at the claret locus in Drosophila and is required for proper chromosome distribution in meiosis and early mitosis. The protein contains a region with 41% amino acid sequence identity to kinesin heavy chain, but tra...
journal_title：Journal of cell science
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abstract：:Triton X-100-treated sperms were injected into non-nucleate egg fragments of Xenopus laevis to determine whether the structure of the injected sperm nucleus is affected by the cyclic activity of the cytoplasm. Swollen vesicular nuclei were very frequently observed when the sperms were injected and incubated during the...
journal_title：Journal of cell science
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pub_type： 杂志文章
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更新日期：2015-03-01 00:00:00
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pub_type： 杂志文章
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更新日期：2017-07-15 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1983-05-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：10.1242/jcs.109066
更新日期：2012-12-15 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1998-08-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
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更新日期：2009-12-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1975-05-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1994-02-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章,评审
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更新日期：2016-03-01 00:00:00
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pub_type： 杂志文章
doi：10.1242/jcs.052514
更新日期：2009-10-15 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1976-11-01 00:00:00
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doi：
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doi：
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journal_title：Journal of cell science
pub_type： 杂志文章
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更新日期：1997-07-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1995-02-01 00:00:00
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更新日期：2001-02-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1981-10-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1995-05-01 00:00:00
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1994-04-01 00:00:00
