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Anticancer Drug Des. 2000 Jun;15(3):217-23.
Antimetastatic and antitumor effects of 2,4-diamino-6-(pyridine-4-yl)-1,3,5-triazine (4PyDAT) on the high lung metastatic colon 26 tumor in mice.
Maeda M, Ligo M, Tsuda H, Fujita H, Yonemura Y, Nakagawa K, Endo Y, Sasaki T.
Experimental Pathology and Chemotherapy Division, National Cancer Center Research Institute, Tokyo, Japan.
The therapeutic potential of a diaminotriazine, 2,4-diamino-6-(pyridine-4-yl)-1,3,5-triazine (4PyDAT), was investigated in a metastatic model using the mouse colon 26 carcinoma variant (Co26Lu), which preferentially metastasizes to the lung of mouse. The compound had a moderate antimetastatic activity as well as antitumor activity, without toxicity to the host, when administered orally. In the cytotoxicity test in vitro, 4PyDAT showed very weak direct cytotoxicity against the Co26Lu cell line, Co26Lu(F55) (IC50 < or = 1000 microM). Less microcapiral formation on tumors were observed for the treated group with a hemorrhage than the control group under microscopy. 4PyDAT significantly inhibited the production of urokinase-type plasminogen activator (u-PA) in Co26Lu(F55) cells. These results suggest that the antimetastatic and antitumor activities of 4PyDAT are due in part to inhibition of angiogenesis, rather than direct antiproliferative action on the tumor cells. 4PyDAT may become a lead compound to develop antitumor triazine derivatives based on antiangiogenic action.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11049089&dopt=Abstract hemorrhage
Shock. 2000 Oct;14(4):451-9.
Hemodynamic pathogenesis of ischemic hepatic injury following cardiogenic shock/resuscitation.
Bailey RW, Brengman ML, Fuh KC, Hamilton SR, Herlong HF, Bulkley GB.
Department of Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Post-ischemic hepatic injury is observed commonly following cardiogenic or hypovolemic shock. We evaluated the putative roles of the alpha-adrenergic sympathetic nervous system and the renin-angiotensin axis in the pathogenesis of hepatic injury following cardiogenic shock. Previous studies have characterized the hepatic hemodynamic response to shock, while the relationship of these hemodynamic changes to ischemic hepatic injury has not been defined. Sustained (4 h) periods of pericardial tamponade (after mild hemorrhage) followed by 2 h of resuscitation generated a reproducible model of cardiogenic shock and consequent post-ischemic hepatic injury in anesthetized pigs. In a separate group of pigs, the alpha-adrenergic component of the sympathetic nervous system was ablated with phenoxybenzamine or, in other groups, the renin-angiotensin axis was ablated by either prior nephrectomy or, separately, by confirmed angiotensin converting enzyme inhibition with teprotide. The hepatic injury response in each case was reevaluated. Compared to sham-shocked pigs, those subjected to tamponade alone manifested selective splanchnic vasospasm and consequent biochemical and histological evidence of classic post-ischemic liver injury (centrilobular necrosis involving about a third of each hepatic lobule). These manifestations of splanchnic vasospasm and the consequent ischemic injury were not ameliorated by confirmed alpha-adrenergic blockade, but significantly attenuated by either method of prior ablation of the renin-angiotensin axis. This model of sustained cardiogenic shock and resuscitation generates the manifestations of ischemic hepatic injury associated with selective splanchnic vasospasm, findings consistent with previous, short-term, hemodynamic studies. The major mediator of this response, and the consequent hepatic injury, is the selective hypersensitivity of the mesenteric vasculature to the renin-angiotensin axis.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11049109&dopt=Abstract hemorrhage
Shock. 2000 Oct;14(4):465-70.
Androgen and estrogen receptors in splenic T lymphocytes: effects of flutamide and trauma-hemorrhage.
Samy TS, Schwacha MG, Cioffi WG, Bland KI, Chaudry IH.
Center for Surgical Research, Department of Surgery, Brown University School of Medicine and Rhode Island Hospital, Providence 02903, USA.
The endogenous sex steroids, testosterone and beta-estradiol, play a major role in inflammatory processes. They regulate several cytokine genes by interaction with their intracellular receptors that are, essentially, transcription factors. Because T-lymphocyte functions are altered following trauma-hemorrhage in male mice, we investigated whether (i) receptors for androgen (AR) and estrogen (ER) are present in splenic T lymphocytes, (ii) receptor expressions are altered following trauma-hemorrhage, and (iii) pretreatment of male mice with the AR antagonist, flutamide, alters receptor expressions and IL-6 release. Analysis of nuclear extracts indicated the presence of AR and ER in splenic T lymphocytes. No difference in receptor expressions between males and females or following trauma-hemorrhage was observed. Pretreatment of males with flutamide, however, led to increased ER expression in T lymphocytes of sham and trauma-hemorrhaged animals. This suggested that flutamide is capable of inducing the expression of another receptor belonging to a different gonadal steroid. Because response elements for AR and ER are present in the promoter region of the IL-6 gene, release of IL-6 and expression of signal transducer and activator of transcription 3 (STAT3) were analyzed as functional parameters in splenic T lymphocytes. Trauma-hemorrhage decreased IL-6 release by T lymphocytes and the release was restored to sham levels with flutamide pre-treatment. Similarly, STAT3 expression was decreased in T lymphocytes following trauma-hemorrhage and the expression was restored by flutamide pre-treatment. These data collectively demonstrate the importance of gonadal steroids in the regulation of splenic T-lymphocyte functions.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11049111&dopt=Abstract hemorrhage
Shock. 2000 Oct;14(4):471-7.
Angiotensin II blockade in existing hypovolemia: effects of candesartan in the porcine splanchnic and renal circulation.
Laesser M, Fandriks L, Pettersson A, Ewert S, Aneman A.
Department of Physiology, Goteborg University, Sweden.
Angiotensin II (AngII) is an important vasoconstrictor during hypovolemia. This study focused on the effects of the AngII receptor blocker candesartan on intestinal, hepatic, and renal hemodynamics during severe hypovolemia when administered in preexisting moderate hypovolemia. It was hypothesized that specific AngII receptor blockade might enhance splanchnic perfusion during hypovolemia. Fasted, anesthetized, ventilated, juvenile pigs were hemorrhaged by 20% of the blood volume for 30 min. Animals were then randomized to receive candesartan (CAND, n = 11) or the vehicle (CTRL, n = 10) prior to further hemorrhage to 40% of the blood volume for 30 min. The shed blood was then retransfused. Systemic and splanchnic hemodynamics were recorded including intestinal mucosal, superficial and parenchymal hepatic, and cortical and medullary renal microcirculation by laser-Doppler flowmetry. Arterial blood gases were analysed. Candesartan-treated animals maintained mesenteric and jejunal mucosal perfusion during 40% hypovolemia compared to CTRL animals, while no differences were observed in the hepatic and renal circulation. Retransfusion restored mesenteric and renal blood flows despite persistent hypotension and reduced cardiac output in both CAND and CTRL animals. Renal medullary and hepatic parenchymal microcirculation failed to recover during retransfusion in both CAND and CTRL animals. Arterial acidosis, hypercarbia, and a negative base excess were observed in CTRL animals following retransfusion whereas those parameters were normalised in CAND animals. Administration of candesartan in moderate hypovolemia ameliorated the reduction and consequences of mesenteric and intestinal, but not hepatic perfusion during severe hypovolemia. No adverse effects were observed in the renal circulation.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11049112&dopt=Abstract hemorrhage
Am J Physiol Regul Integr Comp Physiol. 2000 Nov;279(5):R1776-86.
Methysergide delays the decompensatory responses to severe hemorrhage by activating 5-HT(1A) receptors.
Scrogin KE, Johnson AK, Brooks VL.
Department of Physiology and Pharmacology, The Oregon Health Sciences University, Portland, Oregon 97201, USA. kscroguc.edu
Central administration of the serotonin receptor ligand methysergide delays the decompensatory response to hypotensive hemorrhage. This study was performed to determine the receptor subtype that mediates this effect. Lateral ventricular (LV) injection of methysergide (40 microg) delayed the hypotensive, bradycardic, and sympathoinhibitory responses to blood withdrawal (1.26 ml/min) in conscious rats. The response was quantified, in part, as the blood volume withdrawal that produced a 40-mmHg fall in blood pressure. The delayed hypotensive response produced by methysergide (8.2 +/- 0.2 vs. 5.6 +/- 0.2 ml, P < 0.01) was reversed by the 5-hydroxytryptamine (HT)(1A) antagonist WAY-100635 (30 microg iv: 6.7 +/- 0.4 ml, P < 0. 01; 100 microg iv: 5.6 +/- 0.1 ml, P < 0.01). LV injection of the 5-HT(1A) agonist (+)-8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) also delayed the hypotensive (10 microg: 8.6 +/- 0.3, P < 0.01; 20 microg: 9.2 +/- 0.3 ml, P < 0.01), bradycardic, and sympathoinhibitory responses to hemorrhage. WAY-100635 (10 microg iv) completely reversed the effects of 8-OH-DPAT (20 microg: 5.4 +/- 0.3 ml). Neither selective blockade of 5-HT(2) receptors nor stimulation of 5-HT(1B/1D) receptors had any effect on hemorrhage responses. These data indicate that methysergide stimulates 5-HT(1A) receptors to delay the decompensatory responses to hemorrhage.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11049861&dopt=Abstract hemorrhage
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