The ADAM-integrin-tetraspanin complex in fetal and postnatal testicular cords
| العنوان: | The ADAM-integrin-tetraspanin complex in fetal and postnatal testicular cords |
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| المؤلفون: | Abraham L. Kierszenbaum, Laura L. Tres |
| المصدر: | Birth Defects Research Part C: Embryo Today: Reviews. 75:130-141 |
| بيانات النشر: | Wiley, 2005. |
| سنة النشر: | 2005 |
| مصطلحات موضوعية: | Male, Models, Anatomic, Cytoplasm, Integrins, Embryology, medicine.medical_specialty, Time Factors, Disintegrins, Integrin, Apoptosis, Models, Biological, Gonocyte, Tetraspanin, Cell Movement, Internal medicine, Testis, Cell Adhesion, medicine, Disintegrin, Animals, Humans, RNA, Messenger, Microscopy, Video, Sertoli Cells, biology, Reverse Transcriptase Polymerase Chain Reaction, Cell adhesion molecule, Cell Membrane, Membrane Proteins, Metalloendopeptidases, General Medicine, Sertoli cell, Protein Structure, Tertiary, Rats, Cell biology, Meiosis, Endocrinology, medicine.anatomical_structure, embryonic structures, biology.protein, ADAM3, Dimerization, Developmental Biology, CD81 |
| الوصف: | New insights have emerged about the expression, during testicular cord formation, of the ADAM (a disintegrin and metalloprotease) domain family of proteins that combines both cell surface adhesion and proteolytic activity; this family includes integrins α3β1 and α6β1 and tetraspanins, a distinct family of proteins containing four transmembrane domains, a small and a large extracellular loop, and short cytoplasmic tails. ADAM3 (cyritestin), ADAM5, ADAM6, and ADAM15 are expressed in fetal rat testes. In contrast, the expression of the ADAM1/ADAM2 pair (fertilin α/fertilin β, respectively) is not detected in fetal testis. Yet the expression of ADAM1 starts immediately after birth, and is followed within 24 hr by the expression of ADAM2. Therefore, the ADAM1/ADAM2 heterodimer is visualized far in advance of the meiotic and spermiogenic phase of spermatogenesis. A similar expression pattern was observed for integrin subunits α3, α6, and β1, as well as for tetraspanins CD9, CD81, and CD98; the latter is a single-pass integrin subunit β1-binding protein. ADAM2, integrin subunits α3, α6, and β1, and tetraspanin CD9 and CD81 immunoreactive sites are observed in prespermatogonia (also known as primordial germ cells or gonocytes). A model is proposed in which the ADAM-integrin-tetraspanin complex, known to constitute a network of membrane microdomains called the tetraspanin web, may be involved in the migration of prespermatogonia from the center to the periphery of the testicular cords and in the reinitiation of mitotic activity during the initial wave of spermatogenesis. A complementary model consists in the rearrangement of the tetraspanin web in prespermatogonia/spermatogonia undergoing spontaneous or Fas-induced apoptosis upon coculturing with Sertoli cells. In this model, the cellular site involved in the formation of preapoptotic bodies is devoid of tetraspanin-integrin clusters, in contrast with nonapoptotic cells, which display a diffuse circumferential distribution. In apoptotic prespermatogonia, immunoreactive clusters are restricted to sites where the attachment of prespermatogonia/spermatogonia to Sertoli cell surfaces is still preserved. Birth Defects Research (Part C) 75:130–141, 2005. © 2005 Wiley-Liss, Inc. |
| تدمد: | 1542-9768 1542-975X |
| DOI: | 10.1002/bdrc.20041 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3281a186c980c68853e56d764a95b06c https://doi.org/10.1002/bdrc.20041 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....3281a186c980c68853e56d764a95b06c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15429768 1542975X |
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| DOI: | 10.1002/bdrc.20041 |