Abstract:
:Little is known about specific proteins involved in keratinization of the epidermis of snakes. The presence of histidine-rich molecules, sulfur, keratins, loricrin, transglutaminase, and isopeptide-bonds have been studied by ultrastructural autoradiography, X-ray microanalysis, and immunohistochemistry in the epidermis of snakes. Shedding takes place along a shedding complex, which is composed of two layers, the clear and the oberhautchen layers. The remaining epidermis comprises different layers, some of which contain beta-keratins and others alpha-keratins. Weak loricrin, transglutaminase, and sometimes also iso-peptide-bond immunoreactivities are seen in some cells, lacunar cells, of the alpha-layer. Tritiated histidine is mainly incorporated in the shedding complex, especially in dense beta-keratin filaments in cells of the oberhautchen layer and to a small amount in cells of the clear layer. This suggests the presence of histidine-rich, matrix proteins among beta-keratin bundles. The latter contain sulfur and are weakly immunolabeled for beta-keratin at the beginning of differentiation of oberhautchen cells. After merging with beta cells, the dense beta-keratin filaments of oberhautchen cells become immunopositive for beta-keratin. The uptake of histidine decreases in beta cells, where little dense matrix material is present, while pale beta-keratin filaments increase. During maturation, little histidine labeling remains in electron-dense areas of the beta layer and in those of oberhautchen spinulae. Some roundish dense granules of oberhautchen cells rich in sulfur are negative to antibodies for alpha-keratin, beta-keratin, and loricrin. The granules eventually merge with beta-keratin, and probably contribute to the formation of the resistant matrix of oberhautchen cells. In conclusion, beta-keratin, histidine-rich, and sulfur-rich proteins contribute to form snake microornamentations.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Alibardi Ldoi
10.1002/jmor.10326keywords:
subject
Has Abstractpub_date
2005-05-01 00:00:00pages
178-90issue
2eissn
0362-2525issn
1097-4687journal_volume
264pub_type
杂志文章abstract::To illustrate vascular modification accompanying transition from aquatic to amphibious life in gobies, we investigated the respiratory vasculatures of the gills and the bucco-opercular cavities in one of the most terrestrially-adapted mudskippers, Periophthalmodon schlosseri, using the corrosion casting technique. The...
journal_title:Journal of morphology
pub_type: 杂志文章
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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journal_title:Journal of morphology
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更新日期:1996-12-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1989-11-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2000-06-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1980-09-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051760211
更新日期:1983-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1984-01-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2019-11-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052010306
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更新日期:2015-06-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2006-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:1996-03-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2009-07-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1985-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1979-03-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2009-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051390404
更新日期:1973-04-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2019-02-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2004-01-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1978-10-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051450202
更新日期:1975-02-01 00:00:00