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  • American Physiological Society  (2)
  • 1980-1984  (2)
Type of Medium
Publisher
  • American Physiological Society  (2)
Language
Years
  • 1980-1984  (2)
Year
  • 1
    Online Resource
    Online Resource
    American Physiological Society ; 1980
    In:  American Journal of Physiology-Gastrointestinal and Liver Physiology Vol. 238, No. 6 ( 1980-06-01), p. G526-G530
    In: American Journal of Physiology-Gastrointestinal and Liver Physiology, American Physiological Society, Vol. 238, No. 6 ( 1980-06-01), p. G526-G530
    Abstract: Although trophic actions of gastrointestinal peptides on exocrine pancreas have been shown, little is known regarding their effects in endocrine pancreas. Therefore, we measured the contents of somatostatin-like immunoreactivity (SLI), insulin and glucagon, in pancreatic extracts from rats that had been treated three times a day for 10 days with saline; 1 microgram/kg caerulein; 5, 25, and 100 microgram/kg secretin; 1 microgram/kg caerulein plus 5, 25, and 100 microgram/kg secretin; 25 microgram/kg pancreatic polypeptide; 15 microgram/kg glicentin; or 15 microgram/kg gastric-inhibitory polypeptide. Pancreatic SLI content was significantly increased in rats treated with glicentin and caerulein plus secretin at the two higher doses. No difference was noted between the control and the caerulein plus 100 microgram/kg secretin groups in delta-cell number per islet when examined by the immunoperoxidase technique. These data suggest that because of their effect on SLI content gastrointestinal polypeptides may modulate pancreatic endocrine function.
    Type of Medium: Online Resource
    ISSN: 0193-1857 , 1522-1547
    Language: English
    Publisher: American Physiological Society
    Publication Date: 1980
    detail.hit.zdb_id: 1477329-6
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    American Physiological Society ; 1983
    In:  American Journal of Physiology-Renal Physiology Vol. 245, No. 2 ( 1983-08-01), p. F204-F209
    In: American Journal of Physiology-Renal Physiology, American Physiological Society, Vol. 245, No. 2 ( 1983-08-01), p. F204-F209
    Abstract: Bone mineral is thought to decompose during acute and chronic metabolic acidosis and thereby contribute to buffering of the acid load. We cultured neonatal mouse calvariae for 3 h and found calcium efflux from bone when the medium pH was below 7.40, calcium influx into bone when the pH was above 7.40, and no net flux at pH 7.40. The calcium flux varied to the same extent when medium pH was altered by a primary change in the medium bicarbonate concentration or in the partial pressure of carbon dioxide. Calcium and proton fluxes were inversely correlated (r = -0.713, P less than 0.001), and the slope of the linear regression indicated that between 16 and 21 neq of proton entered the calvariae in exchange for each neq of calcium that left. In 24-h cultures, acid medium also caused net calcium efflux from bone, and alkaline medium caused net influx. PTH increased calcium efflux at acid but not at alkaline medium pH. Sodium azide resulted in net influx of calcium into bone at all values of medium pH. Calcium release by cultured calvariae in response to low medium pH is associated with proton buffering; over 3 h the stoichiometry indicates that little buffering is due to the dissolution of calcium-containing crystals. Effects of medium pH on calcium release are amplified by PTH, and calcium efflux can be prevented by the metabolic inhibitor sodium azide.
    Type of Medium: Online Resource
    ISSN: 1931-857X , 1522-1466
    Language: English
    Publisher: American Physiological Society
    Publication Date: 1983
    detail.hit.zdb_id: 1477287-5
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