Rate of oxygen consumption by parotid atrophic acinar cells from rats fed liquid diet.
Adult male rats were maintained on a nutritionally adequate liquid-diet or laboratory chow and water (control), for 9 days. They were then killed and the parotid glands removed. Enzymatically dispersed acinar-cell preparations were used to study rates of oxygen consumption (QO2) using a Clark oxygen electrode. For both CON and LD cell preparations the basal QO2 was 0.132 (+/- 0.03-0.05) nmol O2 per microgram DNA per min and in each case this was increased approx. 2.4-fold under stimulation by carbachol (10 microM) and approx. 3.1-fold by adrenaline (10 microM). Isoprenaline (10 microM) elicited no significant increase in QO2. Addition of ouabain (2.5 mM) or removal of Ca2+ from the extracellular medium prevented the action of carbachol to increase QO2 over a sustained period. There were no significant differences in the basal, agonist-stimulated, or ouabain-sensitive QO2 by dispersed acinar cells from liquid-diet rats compared to control. The results are consistent with the notion that liquid diet-induced atrophy represents a physiological adaptation rather than a pathological change. Nevertheless, they also indicate that in the acinar cells from liquid-diet rats the Na+/K+ ATPase is required to operate at normal levels of energy consumption despite the reduced acinar-cell volume and consequently lower levels of agonist-elicited transepithelial ion movements known to occur in these cells.
D000821:Animal Feed; D000818:Animals; D002217:Carbachol / Q000494:pharmacology; D004837:Epinephrine / Q000494:pharmacology; D005526:Food, Formulated; D007545:Isoproterenol / Q000494:pharmacology; D008297:Male; D018721:Muscarinic Agonists / Q000494:pharmacology; D009929:Organ Size; D010101:Oxygen Consumption; D010306:Parotid Gland / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D013268:Stimulation, Chemical
D018721:Muscarinic Agonists; D002217:Carbachol; D007545:Isoproterenol; D004837:Epinephrine