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Partition of tissue functions in epithelia: localization of enzymes in "mitochondria-rich" cells of toad urinary bladder | | W N Scott
; V S Sapirstein
; M J Yoder
; | | Date: |
17 May 1974 | | Journal: | Science, 184 (138), 797-800 | | Abstract: | The mucosal epithelium of the toad urinary bladder reabsorbs sodium, acidifies the urine, and is responsive to neurohypophyseal hormnones. Mucosal epithelial cells, consisting of two major morphologic cell types, "mitochondria-rich" and "granular," were removed from the bladder and separated by density gradient centrifugation. The mitochondria-rich cells contained three times as much carbonic anhydrase activity as the granular cells. Oxytocin caused a 235 percent increase in the adenosine 3’,5’-monophosphate content of mitochondria-rich cells but had no effect on the granular cells. The evidence indicates that the mitochondria-rich cell, which accounts for only 15 percent of the mucosal cells, plays a major role in the mediation of sodium ion and hydrogen ion transport in the toad bladder and is a specific site of action of neurohypophyseal hormones. | | Source: | PubMed, pmid4362477 | | Services: | Forum | Review | Favorites | |
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