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Confocal microscopical analysis of epithelial cell heterogeneity in mouse Peyer's patches

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Summary

Cyanine dye fluorescence and alkaline phosphatase activities have been compared directly by confocal microscopy in a wide variety of cells present in the follice-associated epithelium of the mouse Peyer's patch to test the hypothesis that antigen-transporting M cells have a low membrane potential. In order to make these comparisons it was first necessary to equilibrate living tissue with the membrane potential sensitive dye DIOC5(3), fix with glutaraldehyde and then incubate the fixed tissue with naphthol AS-BI phosphate, a substrate which is hydrolysed by alkaline phosphatase present in the luminal membrane of these epithelial cells. Naphthol AS-BI produced by this reaction, is then coupled to Fast Red TR diazonium salt at the site of hydrolysis. Selecting the 488 nm wavelength of the argon laser source then allows one to measure alkaline phosphatase activities as Fast Red absorbance and membrane potentials by DIOC5(3) fluorescence.

Results obtained show a linear correlation between membrane potential and alkaline phosphatase activity. Relative lack of alkaline phosphatase activity, determined in fixed tissue, has been used previously to identify antigen-transporting M cells (Smithet al., 1987). The present work shows that it is now possible to recognize these cells in living tissue by measurement of DIOC5(3) fluorescence. The possible importance of this finding in providing a way to study cell surface-antigen interactions taking place in living tissue is discussed.

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Authors and Affiliations

  1. AFRC Institute of Animal Physiology and Genetics Research, Babraham, CB2 4AT, Cambridge, UK

    P. S. James & M. W. Smith

  2. Dipartimento di Fisiologia e Biochimica Generali, Universita degli Studi di Milano, Via Celoria 26, 20133, Milano, Italy

    C. Rossetti & D. Cremaschi

Authors
  1. P. S. James
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  2. C. Rossetti
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  3. M. W. Smith
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  4. D. Cremaschi
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James, P.S., Rossetti, C., Smith, M.W. et al. Confocal microscopical analysis of epithelial cell heterogeneity in mouse Peyer's patches. Histochem J 24, 243–250 (1992). https://doi.org/10.1007/BF01046838

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  • DOI: https://doi.org/10.1007/BF01046838

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