Summary
Mitochondria are frequently found to be closely associated with the plaques of desmosomes in a variety of columnar or cuboidal epithelia of fetal or early postnatal mammals (mouse, rat, human being). The organs in which mitochondrial-desmosome complexes were found include stomach, small intestine, pancreas, kidney, epididymis, seminal vesicle, coagulating gland, thyroid gland. The association has not been observed in simple squamous epithelium (vascular endothelium). Mitochondria lie quite close to desmosomes in the stratum spinosum of stratified squamous mucous epithelium of fetal animals and also to axo-dendritic synapses in still poorly differentiated central nervous system. Mitochondria have also been detected close to attachment sites in ectoderm of the early frog gastrulae. Here there is as yet no visible plaque material.
We suggest that the mitochondria may provide energy or some chemical for the formation of the plaque. This hypothesis does not explain why the complexes are not found in poorly differentiated epithelia from older animals.
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Dedicated to Professor Berta V. Scharrer on her 60th birthday, with affection and admiration. — This study was supported by U.S.P.H.S. research grants NB-05219 and GM-10757 from the National Institutes of Health.
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Deane, H.W., Wurzelmann, S. & Kostellow, A.B. Survey for mitochondrial-desmosome complexes in differentiating epithelia. Zeitschrift für Zellforschung 75, 166–177 (1966). https://doi.org/10.1007/BF00407154
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DOI: https://doi.org/10.1007/BF00407154