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Sun H, Zhao P, Liu W, Li L, Ai H, Ma X. Ventromedial hypothalamic nucleus in regulation of stress-induced gastric mucosal injury in rats. Sci Rep 2018; 8:10170. [PMID: 29977067 PMCID: PMC6033936 DOI: 10.1038/s41598-018-28456-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 06/22/2018] [Indexed: 01/22/2023] Open
Abstract
Previous studies showed that restraint water-immersion stress (RWIS) increases the expression of Fos protein in the ventromedial hypothalamic nucleus (VMH), indicating the VMH involving in the stress-induced gastric mucosal injury (SGMI). The present study was designed to investigate its possible neuro-regulatory mechanisms in rats receiving either VMH lesions or sham surgery. The model for SGMI was developed by restraint and water (21 ± 1 °C) immersion for 2 h. Gastric mucosal injury index, gastric motility, gastric acid secretion and Fos expression in the hypothalamus and brainstem were examined on the 15th postoperative day in RWIS rats. Gastric mucosal injury in VMH-lesioned rats was obviously aggravated compared to the control. Gastric acidity under RWIS was obviously higher in VMH-lesioned rats than that in sham rats. Meantime, the VMH-lesioned rats exhibited marked increases in the amplitude of gastric motility in the VMH lesions group after RWIS. In VMH-lesioned rats, Fos expression significantly increased in the dorsal motor nucleus of the vagus (DMV), the nucleus of the solitary tract (NTS), the area postrema (AP), the paraventricular nucleus (PVN) and the supraoptic nucleus (SON) in response to RWIS. These results indicate that VMH lesions can aggravate the stress-induced gastric mucosal injury through the VMH-dorsal vagal complex (DVC)-vagal nerve pathway.
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Affiliation(s)
- Haiji Sun
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China.
| | - Pan Zhao
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China
| | - Wenkai Liu
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China
| | - Lei Li
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China
| | - Hongbin Ai
- Key Laboratory of Animal Resistance Biology of Shandong Province, School of Life Science, Shandong Normal University, Jinan, 250014, China
| | - Xiaoli Ma
- Central Laboratory, Jinan Central Hospital Affiliated to Shandong University, Jinan, 250013, China.
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Age-dependent role of vasopressin in susceptibility of gastric mucosa to indomethacin-induced injury. ACTA ACUST UNITED AC 2010; 161:15-21. [DOI: 10.1016/j.regpep.2009.12.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 12/02/2009] [Accepted: 12/30/2009] [Indexed: 11/23/2022]
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Terlipressin as Rescue Therapy in Catecholamine-Resistant Hypotension in Solid Organ Donors: A Case Report. Transplant Proc 2010; 42:203-5. [DOI: 10.1016/j.transproceed.2009.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Scroggin RD, Quandt J. The use of vasopressin for treating vasodilatory shock and cardiopulmonary arrest. J Vet Emerg Crit Care (San Antonio) 2009; 19:145-57. [DOI: 10.1111/j.1476-4431.2008.00352.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Impact of vasopressin analogues on the gut mucosal microcirculation. Best Pract Res Clin Anaesthesiol 2008; 22:351-8. [DOI: 10.1016/j.bpa.2008.02.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Asfar P, Hauser B, Radermacher P, Matejovic M. Catecholamines and vasopressin during critical illness. Crit Care Clin 2006; 22:131-49, vii-viii. [PMID: 16399024 DOI: 10.1016/j.ccc.2005.08.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
In critical care medicine, catecholamines are most widely used to reverse circulatory dysfunction and thus to restore tissue perfusion. However, catecholamines not only influence systemic and regional hemodynamics, but also exert a variety of significant metabolic, endocrine, and immunologic effects. Arginine vasopressin is a vasomodulatory hormone with potency to restore vascular tone in vasodilatory hypotension. Although the evidence supporting the use of low doses of vasopressin or its analogs in vasodilatory shock is increasing, lack of data regarding mortality and morbidity prevent their implementation in critical care protocols.
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Affiliation(s)
- Pierre Asfar
- Département de Réanimation Médicale, Centre Hospitalier Universitaire, 4 rue Larry, 49993 Angers Cedex 9, France
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Jolley DH, De Keulenaer BL, Potter A, Stephens DP. Terlipressin infusion in catecholamine-resistant shock. Anaesth Intensive Care 2004; 31:560-4. [PMID: 14601280 DOI: 10.1177/0310057x0303100532] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Catecholamine-resistant shock is not uncommon in intensive care. Bolus dose terlipressin (a vasopressin analogue) has been used successfully in this setting allowing cessation of other vasopressor agents. The relative vasopressin deficiency in combination with the restoration of the vascular tone (by blocking adenosine triphosphate potassium-sensitive channels) by exogenous vasopressin may be the explanation of these beneficial effects. We describe a case report where the use of a continuous terlipressin infusion was associated with a dramatic improvement. To our knowledge there have been no previous reports of the use of terlipressin by continuous infusion for the treatment of catecholamine-resistant shock.
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Affiliation(s)
- D H Jolley
- Intensive Care Unit, Royal Darwin Hospital, Darwin, Northern Territory
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Morelli A, Rocco M, Conti G, Orecchioni A, De Gaetano A, Cortese G, Coluzzi F, Vernaglione E, Pelaia P, Pietropaoli P. Effects of terlipressin on systemic and regional haemodynamics in catecholamine-treated hyperkinetic septic shock. Intensive Care Med 2003; 30:597-604. [PMID: 14673520 DOI: 10.1007/s00134-003-2094-3] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2003] [Accepted: 11/03/2003] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To determine the effects of an intravenous bolus dose of a vasopressin analogue, terlipressin (1 mg), on systemic haemodynamic parameters and gastric mucosal perfusion (GMP) in patients with catecholamine-treated septic shock using a gastric tonometry and laser-Doppler flowmetry technique. DESIGN Prospective open label study. SETTINGS Two multidisciplinary intensive care units. PATIENTS Fifteen patients with norepinephrine-treated septic shock. INTERVENTIONS Every patient with mean arterial pressure between 50 and 55 mmHg treated with high dose norepinephrine received an intravenous bolus dose of terlipressin as last resort therapy. A laser-Doppler probe and tonometer were introduced into the gastric lumen. MEASUREMENTS AND MAIN RESULTS Terlipressin produced a decrease in cardiac output ( p<0.05), a progressive increase in mean arterial pressure ( p<0.05) and in GMP, detected by laser-Doppler flowmetry ( p<0.05) over 30 min and sustained for at least 24 h. The ratio of GMP to systemic oxygen delivery increased after terlipressin bolus dose ( p<0.05). The gradient between gastric mucosal and arterial PCO(2) tended to be lower after terlipressin, and the difference was statistically significant ( p<0.05) after 8 h. Terlipressin administration significantly increased ( p<0.05) urine output compared to baseline and higher values were found at each set of measurement. The terlipressin-induced increase in urine output was associated with a significantly increased creatinine clearance ( p<0.05). Reduction of the high-dose norepinephrine was observed in all patients ( p<0.05). CONCLUSIONS Our findings showed that, in patients with norepinephrine-treated septic shock, terlipressin increased GMP, urine output and creatinine clearance by an increase in mean arterial pressure.
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Affiliation(s)
- Andrea Morelli
- Department of Anaesthesiology and Intensive Care, University of Rome La Sapienza, Viale del Policlinico 155, 00161 Rome, Italy.
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De Keulenaer BL, Stephens DP. Comment on "Terlipressin in chronic hyperdynamic endotoxic shock: is it safe?" by P. Asfar. Intensive Care Med 2003; 29:854; author reply 855. [PMID: 12655391 DOI: 10.1007/s00134-003-1695-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2003] [Accepted: 02/15/2003] [Indexed: 11/25/2022]
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Asfar P, Pierrot M, Veal N, Moal F, Oberti F, Croquet V, Douay O, Gallois Y, Saumet JL, Alquier P, Calès P. Low-dose terlipressin improves systemic and splanchnic hemodynamics in fluid-challenged endotoxic rats. Crit Care Med 2003; 31:215-20. [PMID: 12545018 DOI: 10.1097/00003246-200301000-00033] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Vasopressin has been used to treat arterial hypotension associated with hyperdynamic vasoplegic states, but detrimental effects on splanchnic circulation have been reported. We tested the effects of a low-dose vasopressin analogue, terlipressin (6 microg/kg), on systemic and splanchnic hemodynamics in fluid-challenged endotoxic rats (lipopolysaccharide, 30 mg/kg in 1 hr). DESIGN Prospective, randomized, controlled experimental study with repeated measures. SETTING Investigational animal laboratory. SUBJECTS A total of 77 rats were divided into five groups: group C, control (17 rats); group E, LPS (18 rats); group EF, LPS plus fluid challenge (18 rats); group EFT, LPS plus fluid challenge plus terlipressin (18 rats); and group ET, LPS plus terlipressin (seven rats). INTERVENTIONS Rats were anesthetized, mechanically ventilated, and instrumented to measure heart rate, mean arterial pressure, and abdominal aortic and mesenteric vein indexed blood flows; ileal microcirculation was assessed by laser Doppler. After LPS infusion, rats experienced an endotoxic shock and were resuscitated after the allocation group. The fluid challenge was targeted to maintain mean arterial pressure of >90 mm Hg and aortic blood flow at baseline values. MEASUREMENTS AND MAIN RESULTS Terlipressin significantly (p <.05) increased mean arterial pressure without decreasing indexed aortic blood flow and heart rate in the fluid-challenged endotoxic rats (EFT) compared with EF rats and had detrimental effects in hypodynamic endotoxic rats (ET). Fluid challenge significantly (p <.05) increased mesenteric vein blood flow in both the EF and EFT groups, and terlipressin had no detrimental effect on mesenteric blood flow. Terlipressin significantly (p <.05) increased ileal microcirculation in fluid-challenged endotoxic rats (EF and EFT) but not in hypodynamic endotoxic rats (E and ET). CONCLUSION Low-dose terlipressin in fluid-challenged endotoxic rats improved systemic and splanchnic hemodynamics and improved the ileal microcirculation.
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László FA, Varga C, Pávó I, Gardi J, Vecsernyés M, Gálfi M, Morschl E, László F, Makara GB. Vasopressin pressor receptor-mediated activation of HPA axis by acute ethanol stress in rats. Am J Physiol Regul Integr Comp Physiol 2001; 280:R458-65. [PMID: 11208575 DOI: 10.1152/ajpregu.2001.280.2.r458] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The plasma arginine vasopressin (AVP), ACTH, and corticosterone levels and the hypothalamic corticotropin-releasing hormone (CRH) content were measured after oral administration of 1 ml of 75% ethanol to rats, a model known to induce acute gastric erosions and stress. Elevated plasma AVP, ACTH, and corticosterone levels were detected 1 h after ethanol administration. Treatment with the vasopressin pressor (V(1)) receptor antagonist [d(CH(2))(5)Tyr(Me)-AVP] before ethanol administration significantly reduced the ACTH and corticosterone level increases. A higher hypothalamic CRH content was measured at 30 or 60 min after ethanol administration. V(1) receptor antagonist injection, 5 min before ethanol administration, inhibited the rise in hypothalamic CRH content. The protein synthesis blocker cycloheximide prevented the hypothalamic CRH content elevation after stress. The AVP-, CRH-, and AVP + CRH-induced in vitro ACTH release in normal anterior pituitary tissue cultures was also prevented by pretreatment with the V(1) receptor antagonist. The results support the hypothesis that stress-induced AVP may not only act directly on the ACTH producing anterior pituitary cells but also indirectly at the hypothalamic level via the synthesis and release of CRH.
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Affiliation(s)
- F A László
- Department of Comparative Physiology, Attila József University of Sciences, H-6726 Szeged, Hungary.
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Balint GA, Galfi M, Juhasz A, Laszló FA, Rimanóczy A. Gastric mucosal endogenous prostacyclin levels are different in Brattleboro rats compared with Wistar strain. JOURNAL OF PHYSIOLOGY, PARIS 2001; 95:173-5. [PMID: 11595433 DOI: 10.1016/s0928-4257(01)00070-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Homozygous Brattleboro rats were investigated and compared to normal (physiological) Wistar strain rats regarding their gastric mucosal endogenous prostacyclin (PG-I(2)) level. It seems that the Brattleboro animals have a significantly lower level of this important protective material. Wistar rats having an artificial pituitary stalk lesion (which is the artificial equivalent of homozygous Brattleboro animals) showed no differences in endogenous mucosal prostacyclin level compared to normal Wistar rats. Therefore, we concluded that this hitherto unknown property of the homozygous Brattleboro rats is genetically determined.
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Affiliation(s)
- G A Balint
- Laboratory of Clinical Pharmacology, Department of Psychiatry, New Clinics, Medical Faculty, University of Szeged, Szeged, Hungary.
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Pávó I, Morschl E, Szepes Z, Kiss J, Boda K, Vetró G, Varga C, László FA, László F. Vasopressin deficiency decreases the frequency of gastroduodenal ulceration in humans. JOURNAL OF PHYSIOLOGY, PARIS 2000; 94:63-6. [PMID: 10761691 DOI: 10.1016/s0928-4257(99)00101-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Vasopressin is a stress hormone released from the posterior pituitary. In humans suffering from central diabetes insipidus, this release of vasopressin is diminished. It was shown previously that the congenitally vasopressin-deficient Brattleboro homozygous rat is less sensitive to various ulcerogenic stimuli. In this study, we investigated the incidence of gastroduodenal ulceration in vasopressin deficient patients. Data on patients aged 20-70, hospitalized in Hungary between 1992 and 1995 were compared with those on the total population in this age group (6,681,020 in 1994). Subjects with central diabetes insipidus were selected separately (815 cases). Gastroduodenal ulceration was compared in subjects with an intact vasopressin release and vasopressin-deficient patients. The frequencies of gastroduodenal ulceration were also examined separately in male and female subjects. In the total population, the frequency of gastroduodenal ulceration was lower in vasopressin-deficient cases (2.22% versus 0.61%; P < 0.005). Among normal-vasopressin subjects, males have a higher risk of gastroduodenal ulceration than females (3.04% versus 1.46%, respectively; P < 0.001). Among vasopressin-deficient subjects, a similar male:female ratio was observed, but it was not significant (P = 0.36). In comparison to the normal-vasopressin population, the incidence of gastroduodenal ulceration was reduced among vasopressin-deficient males and females by 77% (P < 0.01) and by 82% (P < 0.05), respectively. In conclusion, endogenous vasopressin has a significant harmful action towards the human gastroduodenal mucosa. Peptide and non-peptide vasopressin receptor antagonists might have a potential therapeutic benefit in the treatment (as an adjuvant) and prevention of gastroduodenal ulceration.
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Affiliation(s)
- I Pávó
- Endocrine Unit, Albert Szent-Györgyi Medical University, Szeged, Hungary
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Szepes Z, Morschl E, Kiss J, Pávó I, Whittle BJ, Varga C, László FA, László F. Detrimental effects of oestradiol on cysteamine-induced gastroduodenal ulceration in the female rat. JOURNAL OF PHYSIOLOGY, PARIS 1999; 93:491-4. [PMID: 10672994 DOI: 10.1016/s0928-4257(99)00112-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The actions of the female sex steroid, oestradiol on cysteamine-induced mucosal ulceration has been evaluated in female Wistar rats. Administration of cysteamine (400 mg x kg(-1), s.c.) provoked macroscopic gastroduodenal mucosal injury (assessed planimetrically) and an increase in microvascular permeability (assessed by the extravasation of radiolabeled albumin) in the stomach and duodenum, determined 24 h later. Ovariectomy (2 weeks before cysteamine) reduced gastroduodenal macroscopic injury, and albumin extravasation following cysteamine challenge. Administration of oestradiol (1-5 mg x kg(-1), as an i.m. depot 1 week before cysteamine) dose-dependently augmented gastric and duodenal macroscopic mucosal lesions and microvascular permeability provoked by cysteamine. These findings indicate that oestradiol can exacerbate gastroduodenal ulceration and microvascular injury.
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Affiliation(s)
- Z Szepes
- First Department of Medicine, Albert Szent-Györgyi Medical University, Szeged, Hungary
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László F, Pávó I, Szepes Z, Varga CS, László FA. Deleterious action of vasopressin in gastroduodenal ulceration: experimental and clinical observations. SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY. SUPPLEMENT 1998; 228:62-7. [PMID: 9867115 DOI: 10.1080/003655298750026589] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Vasopressin, released from the posterior pituitary and from the vascular endothelium, can cause vasoconstriction and provoke platelet aggregation, leading to an impaired tissue blood supply. In humans with pituitary diabetes insipidus the central release of vasopressin is diminished, and in the Brattleboro homozygous rat there is congenitally no synthesis of this hormone. The gastroduodenal intramucosal vasopressin level is elevated in normal rats following various acute ulcerogenic challenges (after ethanol, reserpine, indomethacin, cold-restraint stress, endotoxin shock and hemorrhagic shock), and vasopressin-deficient rats are less sensitive to these stimuli. In a hospital- and population-based case-control, age-matched retrospective study, the incidence of human gastroduodenal ulceration is significantly higher in the normal population (in whom the release of vasopressin is presumed to be intact) than in the vasopressin-deficient one (central diabetes insipidus patients). In conclusion, endogenous vasopressin plays an aggressive role in development of gastroduodenal ulceration, especially that related to stress.
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Affiliation(s)
- F László
- First Dept. of Medicine and Endocrine Unit, Albert Szent-Györgyi Medical University, Szeged, Hungary
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Lászloa F, Whittle BJ. Early phase microvascular interactions in rat jejunum between nitric oxide and vasopressin following indomethacin administration. J Gastroenterol Hepatol 1998; 13:S262-S265. [PMID: 28976665 DOI: 10.1111/j.1440-1746.1998.tb01889.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
The involvement of endogenous vasopressin in the actions of indomethacin following the concurrent administration of the nitric oxide (NO) synthase inhibitor, NG -nitro-l-arginine methyl ester (l-NAME), on acute intestinal microvascular permeability has been investigated in the rat. Administration of indomethacin (10mg/kg, s.c.) or L-NAME (10mg/kg, s.c.) alone did not affect jejunal and ileal vascular permeability after 1 h, as determined by the leakage of radiolabelled serum albumin. In contrast, when indomethacin (10mg/kg, s.c.) was injected concurrently with L-NAME (2-10mg/kg, s.c), significant dose-dependent plasma leakage occurred in the jejunum. Pretreatment with l-arginine (300 mg/kg s.c.) 15 min prior to l-NAME prevented these changes in microvascular permeability. Moreover, pretreatment with the vasopressin pressor-receptor antagonist, d(CH2 )5 Tyr(Me)AVP (0.01-0.2m̈g/kg, s.c.) dose-dependently attenuated such damage. These findings suggest that following indomethacin administration, the early inhibition of NO synthase leads to acute microvascular injury involving vasopressin in the rat jejunum. This suggests a protective role of NO, formed by constitutive NO synthase, counteracting effectively the deleterious actions of endogenous vasopressin.
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Affiliation(s)
- Ferenc Lászloa
- First Department of Medicine, Albert Szent-Györgyi Medical University, Szeged, HungaryThe William Harvey Research Institute, St Bartholomew's Royal London School of Dentistry Medicine, London, United Kingdom
| | - Brendan Jr Whittle
- First Department of Medicine, Albert Szent-Györgyi Medical University, Szeged, HungaryThe William Harvey Research Institute, St Bartholomew's Royal London School of Dentistry Medicine, London, United Kingdom
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Varga C, Pávó I, Lamarque D, Szepes Z, Kiss J, Karácsony G, László FA, László F. Endogenous vasopressin increases acute endotoxin shock-provoked gastrointestinal mucosal injury in the rat. Eur J Pharmacol 1998; 352:257-61. [PMID: 9716362 DOI: 10.1016/s0014-2999(98)00345-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Administration of a low dose of endotoxin (from Escherichia coli, 3 mg kg(-1), i.v.), which does not affect vascular permeability or blood pressure over 1 h, leads to the release of endogenous vasopressin and damage to the mucosal microvasculature. Thus, endogenous vasopressin could be involved in septic shock. In the present study, we investigated the role of endogenous vasopressin in gastrointestinal mucosal injury induced by acute endotoxin shock, which was generated in rats by administering a high dose of E. coli endotoxin (50 mg kg(-1), i.v.). Tissues were removed 15 min after endotoxin. The vasopressin V1 receptor antagonist, d[CH2]5Tyr[Me]arginine-vasopressin (0.2-1 microg kg(-1), i.v.), was injected 10 min before endotoxin. Monastral blue (30 mg kg(-1), i.v.), which stains damaged vasculature, was injected 10 min before autopsy. Endotoxin reduced systemic arterial blood pressure (from 115+/-5 to 42+/-4 mmHg), generated macroscopic and microvascular injury, and elevated plasma vasopressin levels (from 3.4+/-0.2 to 178+/-16 pg ml(-1)). The vasopressin V1 receptor antagonist reduced this macroscopic injury, and in the vasopressin-deficient Brattleboro rat a similar reduction of gastrointestinal mucosal damage was found. Substantial decreases in endotoxin-induced microvascular damage were observed in each tissue, e.g., the gastric Monastral blue staining was reduced by 47+/-3% and 96+/-3% (P < 0.01) after vasopressin V1 receptor antagonist treatment and in Brattleboro rats, respectively. Vasopressin, acting through its V1 receptors, thus appears to be involved in acute endotoxin shock-provoked gastrointestinal injury.
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Affiliation(s)
- C Varga
- Dept. of Comparative Physiology, Attila József University of Sciences, Szeged, Hungary
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László F, Varga C, Montoneri C, Drago F. Damaging actions of testosterone on cysteamine-induced gastroduodenal ulceration and vascular leakage in the rat. Eur J Pharmacol 1997; 337:275-8. [PMID: 9430425 DOI: 10.1016/s0014-2999(97)01265-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The sexual dimorphism of gastroduodenal ulceration is suggested on the basis of clinical and experimental observations. This difference probably relates to the actions of endogenous sexual steroids. In the present study, the role of testosterone was evaluated in the generation of gastroduodenal mucosal injury provoked by cysteamine (400 mg/kg, s.c.). We found that macroscopic mucosal damage and microvascular (125)I-human serum albumin leakage (2 microCi/kg, i.v.) developed in the stomach and duodenum of male rats 24 h after the administration of cysteamine. This mucosal injury was prevented by orchidectomy and by the pretreatment with the antiandrogen, cyproterone acetate (12 mg/kg per day for 8 consecutive days). It was also shown that pretreatment with testosterone (4-20 mg/kg per week) dose-dependently aggravated cysteamine-induced gastroduodenal mucosal injury. Our results thus suggest an aggressive role of testosterone in the generation of cysteamine-induced gastroduodenal ulceration.
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Affiliation(s)
- F László
- First Department of Medicine, Albert Szent-Györgyi Medical University, Szeged, Hungary
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Abstract
BACKGROUND Arginine vasopressin V1 receptor antagonist (AVPRA) was administered to investigate the influence of vasopressin blockade on hemodynamics and metabolism during endotoxin shock. METHODS Anesthetized rats were divided into four groups: control (0.9% saline solution, n = 5), drug control (AVPRA, n = 5), endotoxin (endotoxin, 5 mg/kg, n = 10), and pretreatment (AVPRA and endotoxin, n = 10). Hemodynamics and oxygen transport were evaluated for 2 hours. Terminal arterial and portal venous concentrations of endotoxin, pyruvate, lactate, and ketone bodies were determined. RESULTS The endotoxin group maintained blood pressure levels similar to those of control animals. AVPRA pretreatment decreased vascular resistance and resulted in lower blood pressure than endotoxin alone. Endotoxin decreased oxygen consumption and the oxygen extraction ratio and increased arterial lactate concentration and the lactate/pyruvate ratio. Endotoxin also decreased arterial ketone body concentration and markedly decreased ketone body availability in the mesenteric circulation. AVPRA pretreatment improved oxygen consumption, oxygen extraction ratio, and ketone body availability; arterial lactate concentration, lactate/pyruvate ratio, and arterial ketone body concentration were not affected. Pretreatment with AVPRA also decreased arterial and portal venous concentrations of endotoxin. CONCLUSIONS Vasopressin receptor blockade during endotoxemia resulted in lower blood pressure than endotoxin alone. Vasopressin receptor blockade also maintained oxygen extraction ratio and ketone body availability in the mesenteric circulation. Vasopressin may play a key role in the response to endotoxemia.
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Affiliation(s)
- T Matsuoka
- Department of Surgery, University of California, Davis, Sacramento 95817-2282, USA
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Endogenous vasopressin damages duodenal mucosa during haemorrhagic shock in rats. Inflammopharmacology 1996. [DOI: 10.1007/bf02755790] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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László F, Whittle BJ. Constitutive nitric oxide modulates the injurious actions of vasopressin on rat intestinal microcirculation in acute endotoxaemia. Eur J Pharmacol 1994; 260:265-8. [PMID: 7988655 DOI: 10.1016/0014-2999(94)90349-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The administration of the nitric oxide (NO) synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME, 5 mg/kg s.c.) concurrently with Escherichia coli endotoxin (3 mg/kg i.v.) increased vascular permeability and caused mucosal damage in the rat intestine 1 h later. The vasopressin V1 receptor antagonist, [Mca1,Tyr(Me)2, Arg8]vasopressin (0.01-0.2 microgram/kg s.c., 15 min before endotoxin) dose-dependently reduced this damage. These results suggest a beneficial role of NO, counteracting the injurious vascular actions of endogenous vasopressin, in maintaining intestinal mucosal integrity in acute endotoxaemic states.
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Affiliation(s)
- F László
- Department of Pharmacology, Wellcome Research Laboratories, Beckenham, Kent, UK
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