• YAKHAK HOEJI
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• v.26 no.4
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• pp.197-208
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• 1982

In this study attemps were made to obtain evidence as to the action of Mori Radicis Cortex on the renal' function of anesthetized mongrel dogs. 1. A light brown powder isolated from Mori Radicis Cortex (MRC) by a slight modification of Tanemura's method, when given intravenously in doses ranging 0.5 to 5.0mg/kg, elicited diuresis with the increase of positive water clearance and amounts of $Na^{+}$ and $K^{+}$ excreted in the urine. At this time the glomerular filtration rate, renal plasma flow and osmolar clearance were not observed to have any significant changes. This diuresis was augmented in process of time and its maximum effect was exhibited about 30 minutes after administration of MRC. 2. The MRC, when administered into a intra carotid artery, responded promptly with diuresis and natriuresis at a level too small to effect renal functions when administered intravenously. In this experiment the patterns of changes of renal function were the patterns of changes of renal function were the same as those of the above intravenously administered experiment. 3. When infused directly into a renal artery, the MRC exhibited little effect on either kidney. 4. During water diuresis, the MRC did not elicit diuretic action or significant changes in renal functions. The above observations suggest that the diuresis of MRC is brought about by the inhibition of the release of antidiuretic hormone with the mechanism facilitating the excretion of $Na^{+/}$ and $K^{+}$ in urine.

• YAKHAK HOEJI
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• v.41 no.4
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• pp.498-511
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• 1997

The effects of UK 14,304, an ${\alpha}_2$-adrenergic agonist, on renal function were investigated in dogs. UK 14,304, when given intravenousely($15.0{\mu}g/kg,\;50{\mu}g/kg$), produced the increase of urine flow accompanied with the marked augmentation of free water clearance ($C_{H_2O}$) and reabsorption rates of sodium in renal tubules ($R_{Na}$), and the remarkable decrease of osmolar clearance ($C_{osm}$) and the amounts of sodium excreted in urine ($E_{Na}$). UK 14,304 given into a renal artery($1.5{\mu}g/kg,\;5.0{\mu}g/kg$) elicited the increase of urine flow with the augmentation of $C_{H_2O}$ in both kidney. UK 14,304, when administered into carotid artery($3.0{\mu}g/kg,\;10.0{\mu}g/kg$). exhibited the same aspect as shown in intravenous UK 14.304 at smaller dose than the intravenous dose. Diuretic action of intravenous UK 14,304 were produced together with increase of $C_{H_2O}$ in situation of water diuresis too, changes of renal function in this state were the increase of $C_{osm},\;E_{Na},\;and\;E_K$ (excreted amounts of potassium in urine), and the decrease of $R_{Na}\;and\;R_K$, these were different appearances from situation of saline diuresis. Diuretic action of intravenous UK 14,304 were blocked completely by post or pretreatment of yohim-bine, ${\alpha}_2$-adrenergic blocking agents, and inhibited by pretreatment of vasopressin, antidiuretic hormone. Above results suggest that UK 14,304 produces the diuretic action by the inhibition of vasopressin secretion and suppression of electrolytes reabsorption of electrolytes in renal tubules mediated with central ${\alpha}_2$-adrenoceptor in dog.

• Biomolecules & Therapeutics
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• v.6 no.3
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• pp.225-231
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• 1998

This studies were performed for investigation of mechanism on central antidiuretic action of L$_{G}$-Nitro-L-arginine (L-NOARG), nitic oxide systhase inhibitor, in dog. Antidiuretic action of L-NOARG infused into the carotid artery was not affected by renal denervation but inhibited by pretreatment with arginine, NO Precusor. Furthermore, L-NOARG inhibited the diuretic action of dopamine induced by hemodynamic development. Above results suggest that antidiuretic actions of L-NOARG mediated by endogenous substances not associated with renal nerve. Therefore, it is demonstrated that those endogenous substances might be associated with NO which mediate the diuretic action of dopamine.e.

• Journal of Pharmaceutical Investigation
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• v.10 no.3
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• pp.5-13
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• 1980

A study on the diuretic action of Siegesbeckiae herba in dogs was made using a clearance technique with ethanol extract. Siegesbeckiae herba ethanol extract (SGEE) administered intravenously in doses 6.0 and 60.0mg/kg elicited diuresis and an increase in sodium and potassium excretion, and it simultaneously produced a decrease in the reabsorption rate of sodium and potassium in renal tubules. Neither renal plasma flow nor glomerular filtration rate changed significantly. SGEE, when infused directly into a renal artery in doses of 0.5 and 1.5mg/kg min, exhibited identical results to the intravenous responses confined only to the infused kidney. The above observations lead to the suggestion that SGEE elicits diuresis in dogs by decreasing the reabsorption rates of sodium and potassium in renal tubles.

• Journal of Pharmaceutical Investigation
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• v.1 no.1
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• pp.34-46
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• 1971

The existence of oxytocin in the pituitary gland of chicken has been ascertained, but its physiological roles are still obscure. In the study the action of oxytocin on renal function of the chicken was investigated during water diuresis, utilizing clearance and the Sperber technique. The results obtained are summarized as follows: Oxytocin, like in many species of mammals, elicited a profound diuretic response in the chicken. Urine flow, excretion of electrolytes, as well as glomerular filteration rate increased, with intravenous infusion of $3{\sim}10\;m{\mu}/kg/min$. Oxtocin, infused into the renal portal circulation via hindleg vein in a dose of $3{\sim}13\;m{\mu}/kg/min$. elicited marked increase in urine flow, glomerular filteration rate and sodium excreted in the urine. The diuretic effect was more pronounced in the infused side. It is suggested that diuretic response to oxytocin in the chicken results from dual action of oxytocin: increase of GFR and inhibition of sodium reabsorption on the renal tubule. The possibility that oxytocin might act through some endogenous substances could be ruled out.

• Journal of Pharmaceutical Investigation
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• v.3 no.1_2
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• pp.23-33
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• 1973

The effect of atractylis on the renal function of the dog was investigated in this study. Alcohol extract of atractylis, when given intravenously in dose 15mg/kg, elicited antidiuresis rather than diuresis. Also, free water clearance $(C_{H_2O})$ decreased in proportion. No alterations of the renal clearances of creatinine and PAH were detected in the range of doses which are effective in inhibiting diuresis. The effects were obtained with smaller doses when the atractylis was given through the intracarotid artery route rather than intravenously. When infused directly into a renal artery, atratylis exhibited identical action on both kidneys, indicating that the renotropic action is mediated by some endogenous humoral agents. It is therefore suggested that atractylis is capable of releasing ADH from the neurohypophysis.

• YAKHAK HOEJI
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• v.46 no.3
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• pp.174-178
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• 2002

Phellinus linteus (Hymenocaetaceae) is a member of Basidiomycotinae, which has been used for the treatment of gastric cancer, non-insulin-dependent diabetes mellitus, diarrhea, and menstrual irregularity. To investigate the diuretic action of Phellinus linteus, urinary volume, serum parameters and urinary electrolytes in HgCl$_2$-induced acute renal failure rats in vivo were measured. The results showed that its MeOH extract produced significant increases on urinary volume, sodium and potassium excretion, and revealed lowering effects of the abnormally elevated BUN, creatinine and uric acid value in acute renal failure rats.

• The Korean Journal of Pharmacology
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• v.18 no.1
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• pp.1-10
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• 1982

In an attempt to delineate the role of beta-adrenoceptors found to be existing in the brain tissue in the central regulation of renal function, isoproterenol, a ${\beta}-adrenergic$ agonist, was administered directly into a lateral ventricle of the rabbit brain and the changes of renal function were observed. Also, the effects of propranolol, a specific ${\beta}-adrenergic$ blocking agent, and its influence upon the isoproterenol action were studied. Isoproterenol, in doses ranging from 5 to $50\;{\mu}g/kg\;i.c.v.$, elicited antidiuresis which seemed to be related to the decreased renal hemodynamics brought about by the systemic hypotension. With moderate doaes of $15\;{\mu}g/kg$ the antidiuresis was less prominent and there was a tendency toward natriuresis, but with higher doses the natriuretic effect became less evident, overrun by the systemic hypotension. Propranolol, $500\;{\mu}g/kg\;i.c.v.$, produced little effect on the renal function, but it eliminated the antidiuretic action of $50\;{\mu}g/kg$ isoproterenol i.c.v. and reversed it to a diuretic and natriuretic one, along with increases in renal plasma flow and glomerular filtration rate. The systemic hypotension also was markedly attenuated by propranolol pretreatment. Thus, it was evident that the renal action of i.c.v. isoproterenol was not blocked by propranolol and became explicit only when the hypotensive action of isoproterenol which seems to he propranolol-sensitive is removed. Various possibilities to account for this disparity in sensitivity were discussed. It is suggested from these observations that the central ${\beta}-adrenoceptors$ might also be involved in the regulation of renal function along with ${\alpha}-adrenoceptors$, though less significant than the latter.

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.337.1-337.1
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• 2002

Hypertrophy and the alteration of renal cell growth have been reported as early abnormality in diabetic nephropathy. However, the effects ot high PKCglucose and its action mechanism in renal proximal tubular cell (PTC) have not been elucidated. High glucose condition increases diacyl glycerol (DAG) and activates protein kinase C (PKC) in renal tubular cells. The PKC activates mitogen-activated protein kinases (MAPK), such as extracellular regulated kinase (ERK) and p38 MAPK. (omitted)

• The Korean Journal of Pharmacology
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• v.22 no.2
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• pp.128-134
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• 1986

To determine the relationship between hydrochlorothiazide-induced diuretic action and cyclic nucleotides, the effects of hydrochlorothiazide (5 mg/kg, i.v.) on the renal tissue level of cyclic nucleotides and the renal adenylate cyclase and guanylate cyclase activity were investigated. Hydrochlorothiazide elecitied the maximal diuretic effect between 10 and 20 min after the injection of drug. The increased urine flow and urinary electrolytes excretion returned to the control levels 60 min after the injection of drug. 5 and 15 min after drug administration the cAMP level of renal tissue was significantly decreased, but 60 min after the cAMP level was not different from the control level. The cGMP level of renal tissue was not affected by hydrocholorothiazide. Hydrochlorothiazide $(5\;{\times};10^{-4}\;M)$ inhibited the renal adenylate cyclase but not affected the renal guanylate cyclase. These results suggest that cAMP may be involved in the renal action mechanism of hydrochlorothiazide and the involvement of cGMP is uncertain.