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  • Title: Noradrenaline as a possible mediator of angiotensin II induced fluid transport in rat ileum in vitro.
    Author: Souviron A, Díez de los Rios A, Labajos M, Morell M.
    Journal: Rev Esp Fisiol; 1986 Mar; 42(1):51-5. PubMed ID: 3715154.
    Abstract:
    In isolated segments of ileum excised from bilaterally adrenalectomized and nephrectomized rats, 10(-12) M angiotensin or 10(-3) M noradrenaline added to serosal medium stimulated both fluid transfer and NaCl transport. The alpha adrenergic antagonist phentolamine blocked the stimulation of fluid transfer induced by angiotensin. These results are consistent with the hypothesis that noradrenaline may mediate the increase of intestinal fluid absorption induced by angiotensin in the rat. In segments of isolated ileum from normal rats 10(-12) M angiotensin only stimulated fluid transfer under one of the two following conditions when 10(-3) M imipramine, a noradrenaline uptake blocker, was present in the serosal medium; or when the rats had been previously treated with L-Dopa, a precursor of noradrenaline biosynthesis. These results suggested that the necessity for bilateral adrenalectomy and nephrectomy might be associated to the necessity of increasing the tissue levels of noradrenaline. Direct measurement of noradrenaline tissue content confirmed this.
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