{"title":"Immunoreactivity of flexible and inflexible scales in different lizards indicates that the mature beta-layer contains different corneous proteins.","authors":"Lorenzo Alibardi","doi":"10.1007/s00709-025-02048-y","DOIUrl":null,"url":null,"abstract":"<p><p>We have analyzed by immunohistochemical methods the Oberhautchen-beta layer, here abbreviated as beta-layer, of lizards with hard scales and lizards with softer scales. Different antibodies for detecting Corneous Beta Proteins (CBPs) have been utilized. The agamid beta-corneous layer is generally 3-4 times thicker than in geckos, and the surface microornamentation forms a honeycomb pattern. Geckos feature thinner beta-layers and a spinulated pattern and show immunolocalization for CBPs and isopeptide bonds, a product of transglutaminase catalysis, in their thin beta-layer. CBPs and isopeptide-bonds are detected in the superficial Oberhautchen and alpha-layer of agamids while the beta-layer is immuno-negative. Considering the limitations of immunolabeling methods, the unexpected result might derive from inaccessibility of antibodies to epitopes that are masked within the packed corneous material of the agamid beta-layer. However, bioinformatics analysis for CBPs sequenced in the few species of agamids so far known indicates that these proteins have low identity with those of other lizards. This suggests that agamids possess peculiar CBPs but low isopeptide bonds in their inflexible beta-layer. In contrast, the thinner and pliable beta-corneous layers of geckos may derive from the presence of isopeptide bonds mixed with lower amounts of CBPs. The differences in material properties of lizard scales, inflexibility versus pliability, are adaptive for the different ecological conditions of the species here analyzed.</p>","PeriodicalId":20731,"journal":{"name":"Protoplasma","volume":" ","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Protoplasma","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1007/s00709-025-02048-y","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CELL BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
We have analyzed by immunohistochemical methods the Oberhautchen-beta layer, here abbreviated as beta-layer, of lizards with hard scales and lizards with softer scales. Different antibodies for detecting Corneous Beta Proteins (CBPs) have been utilized. The agamid beta-corneous layer is generally 3-4 times thicker than in geckos, and the surface microornamentation forms a honeycomb pattern. Geckos feature thinner beta-layers and a spinulated pattern and show immunolocalization for CBPs and isopeptide bonds, a product of transglutaminase catalysis, in their thin beta-layer. CBPs and isopeptide-bonds are detected in the superficial Oberhautchen and alpha-layer of agamids while the beta-layer is immuno-negative. Considering the limitations of immunolabeling methods, the unexpected result might derive from inaccessibility of antibodies to epitopes that are masked within the packed corneous material of the agamid beta-layer. However, bioinformatics analysis for CBPs sequenced in the few species of agamids so far known indicates that these proteins have low identity with those of other lizards. This suggests that agamids possess peculiar CBPs but low isopeptide bonds in their inflexible beta-layer. In contrast, the thinner and pliable beta-corneous layers of geckos may derive from the presence of isopeptide bonds mixed with lower amounts of CBPs. The differences in material properties of lizard scales, inflexibility versus pliability, are adaptive for the different ecological conditions of the species here analyzed.
期刊介绍:
Protoplasma publishes original papers, short communications and review articles which are of interest to cell biology in all its scientific and applied aspects. We seek contributions dealing with plants and animals but also prokaryotes, protists and fungi, from the following fields:
cell biology of both single and multicellular organisms
molecular cytology
the cell cycle
membrane biology including biogenesis, dynamics, energetics and electrophysiology
inter- and intracellular transport
the cytoskeleton
organelles
experimental and quantitative ultrastructure
cyto- and histochemistry
Further, conceptual contributions such as new models or discoveries at the cutting edge of cell biology research will be published under the headings "New Ideas in Cell Biology".