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Expression and Role of Connexin Proteins in Bovine Claw Epidermis

Identifieur interne : 000939 ( Istex/Corpus ); précédent : 000938; suivant : 000940

Expression and Role of Connexin Proteins in Bovine Claw Epidermis

Auteurs : D. Frohberg-Wang ; Ch. K. W. Mülling ; K. D. Budras

Source :

RBID : ISTEX:7F485424D87A409F31CDAFC675D425192A699E98

Abstract

Gap junction mediated inter‐cellular communication plays a crucial role in maintaining tissue homeostasis in skin. Gap junctions consist of hemi‐channels (connexons), which in turn are established by transmembrane proteins (connexins, Cx). The pattern of Cx‐ protein expression is characteristic for tissues and depends on the differentiational and functional state.

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DOI: 10.1111/j.1439-0264.2005.00669_34.x

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ISTEX:7F485424D87A409F31CDAFC675D425192A699E98

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<p>Aim:  As part of our investigations of cell biological causes for lameness in dairy cows we wanted to assess the expression of Cx‐proteins in relation to differentiation in bovine claw epidermis.</p>
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<p>Methods:  We examined hoof tissue from five defined regions of the claws of 10 cows from the abattoir by immunohistochemistry, Western blot and by transmission electron microscopy. The following monoclonal antibodies were used: anti‐ Cx26, Cx31, Cx37 (ADI, USA) and anti‐Cx43 (Chemicon, USA). Immunohistochemistry was carried out on frozen and paraffin sections.</p>
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<p>Results:  Cx43 was expressed in the bovine claw epidermis in a pattern described for skin. Cx43 expression was strongest in the stratum basale in all regions. Cells of the stratum spinosum expressed lower levels, and in terminal differentiating cells Cx43 was disappearing. Expression of Cx26, 31 and 37 showed a high variation between individuals and regions. Protein expression was verified by Western blotting. The formation of gap junctions in the respective layers was confirmed by electron microscopy.</p>
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<p>Conclusion:  Our results provide evidence that Cx 43 is expressed in bovine claw epidermis in a distribution similar to skin. Cx 43 is progressively downregulated with the progress of differentiation. This suggests a role of Cx43 in cellular coordination particularly in the early stages of differentiation. Results for Cx 26, 31 and 37 will be confirmed in further studies also on the mRNA level to get deeper insight in the regulation of Cx expression in claw epidermis. We hypothesize that Cx 43 plays a similar role in controlling differentiation as in skin and may be involved in disruption of claw horn formation in claw disorders.</p>
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<p>Gap junction mediated inter‐cellular communication plays a crucial role in maintaining tissue homeostasis in skin. Gap junctions consist of hemi‐channels (connexons), which in turn are established by transmembrane proteins (connexins, Cx). The pattern of Cx‐ protein expression is characteristic for tissues and depends on the differentiational and functional state.</p>
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<b>Aim: </b>
As part of our investigations of cell biological causes for lameness in dairy cows we wanted to assess the expression of Cx‐proteins in relation to differentiation in bovine claw epidermis.</p>
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<b>Methods: </b>
We examined hoof tissue from five defined regions of the claws of 10 cows from the abattoir by immunohistochemistry, Western blot and by transmission electron microscopy. The following monoclonal antibodies were used: anti‐ Cx26, Cx31, Cx37 (ADI, USA) and anti‐Cx43 (Chemicon, USA). Immunohistochemistry was carried out on frozen and paraffin sections.</p>
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<b>Results: </b>
Cx43 was expressed in the bovine claw epidermis in a pattern described for skin. Cx43 expression was strongest in the stratum basale in all regions. Cells of the stratum spinosum expressed lower levels, and in terminal differentiating cells Cx43 was disappearing. Expression of Cx26, 31 and 37 showed a high variation between individuals and regions. Protein expression was verified by Western blotting. The formation of gap junctions in the respective layers was confirmed by electron microscopy.</p>
<p>
<b>Conclusion: </b>
Our results provide evidence that Cx 43 is expressed in bovine claw epidermis in a distribution similar to skin. Cx 43 is progressively downregulated with the progress of differentiation. This suggests a role of Cx43 in cellular coordination particularly in the early stages of differentiation. Results for Cx 26, 31 and 37 will be confirmed in further studies also on the mRNA level to get deeper insight in the regulation of Cx expression in claw epidermis. We hypothesize that Cx 43 plays a similar role in controlling differentiation as in skin and may be involved in disruption of claw horn formation in claw disorders.</p>
<p>
<b>Acknowledgement: </b>
This work was supported by the European Communities under the Lamecow project QLK5‐CT‐2002‐00969. The authors are solely responsible and the work does not necessarily represent the opinion of the European Communities.</p>
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<abstract>Gap junction mediated inter‐cellular communication plays a crucial role in maintaining tissue homeostasis in skin. Gap junctions consist of hemi‐channels (connexons), which in turn are established by transmembrane proteins (connexins, Cx). The pattern of Cx‐ protein expression is characteristic for tissues and depends on the differentiational and functional state.</abstract>
<abstract>Aim:  As part of our investigations of cell biological causes for lameness in dairy cows we wanted to assess the expression of Cx‐proteins in relation to differentiation in bovine claw epidermis.</abstract>
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<abstract>Results:  Cx43 was expressed in the bovine claw epidermis in a pattern described for skin. Cx43 expression was strongest in the stratum basale in all regions. Cells of the stratum spinosum expressed lower levels, and in terminal differentiating cells Cx43 was disappearing. Expression of Cx26, 31 and 37 showed a high variation between individuals and regions. Protein expression was verified by Western blotting. The formation of gap junctions in the respective layers was confirmed by electron microscopy.</abstract>
<abstract>Conclusion:  Our results provide evidence that Cx 43 is expressed in bovine claw epidermis in a distribution similar to skin. Cx 43 is progressively downregulated with the progress of differentiation. This suggests a role of Cx43 in cellular coordination particularly in the early stages of differentiation. Results for Cx 26, 31 and 37 will be confirmed in further studies also on the mRNA level to get deeper insight in the regulation of Cx expression in claw epidermis. We hypothesize that Cx 43 plays a similar role in controlling differentiation as in skin and may be involved in disruption of claw horn formation in claw disorders.</abstract>
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<caption>Suppl. no.</caption>
<number>s1</number>
</detail>
<extent unit="pages">
<start>15</start>
<end>16</end>
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<identifier type="istex">7F485424D87A409F31CDAFC675D425192A699E98</identifier>
<identifier type="DOI">10.1111/j.1439-0264.2005.00669_34.x</identifier>
<identifier type="ArticleID">AHE669_34_34</identifier>
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<recordOrigin>Blackwell Verlag GmbH</recordOrigin>
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