TY - JOUR

T1 - An integrated laparoscopic simulator (i-SIM™) to develop surgical skills outside the operating theatre : a novel means to improve training facilities in the UK.

AU - Singh, Paras B.

AU - Saw, Ngiaw K.

AU - Mokete, Moeketsi

AU - Martin, Frank L.

AU - Matanhelia, Shyam S.

PY - 2008/2/1

Y1 - 2008/2/1

N2 - Objectives Tissue damage caused by ischemia/reperfusion injury (IRI) of the intestine may lead to organ dysfunction in several clinical conditions, and is associated with increased incidence of chronic rejection after transplantation. Heme oxygenase-1 (HO-1) is a stress-inducible protein capable of modulating inflammation, oxidative stress, and cell death. The aim of the present study was to assess the effects of HO-1 upregulation on intestinal IRI. Methods Lewis rats (seven groups, n = 6 each) underwent intestinal warm ischemia induced by clamping the superior mesenteric artery and by ligating the inferior mesenteric artery for 60 min. After 120 or 240 min of reperfusion, tissue samples were collected for analysis. Cobalt protoporphyrin (CoPP) was administered IP at 10 or 20 mg/kg 24 h before IRI, to induce HO-1 upregulation. Control animals received vehicle alone. Tissue injury measurements included the following: histological changes, tissue myeloperoxidase (MPO) activity, nitrate/nitrite levels, and IL-6 levels. Results A significant HO-1 upregulation was demonstrated in pre-treated animals (p < 0.05, 95% CI: −0.84 to −0.05). Intestinal IL-6 mRNA expression levels were significantly reduced in animals treated with CoPP 20 mg/kg after 240 min of IRI (p < 0.05, 95% CI: 0.09–2.25). Significant reduction in MPO activity and NO products was observed in treated animals when compared to controls (p < 0.01, 95% CI: 0.07–0.24 and p < 0.01, 95% CI: 5.58–12.75, respectively). Conclusions Induction of HO-1 by CoPP administration before IRI was resulted in a significant reduction of intestinal tissue injury. Developing strategies to induce HO-1 upregulation before surgery will be important to reduce IRI in the clinical setting.

AB - Objectives Tissue damage caused by ischemia/reperfusion injury (IRI) of the intestine may lead to organ dysfunction in several clinical conditions, and is associated with increased incidence of chronic rejection after transplantation. Heme oxygenase-1 (HO-1) is a stress-inducible protein capable of modulating inflammation, oxidative stress, and cell death. The aim of the present study was to assess the effects of HO-1 upregulation on intestinal IRI. Methods Lewis rats (seven groups, n = 6 each) underwent intestinal warm ischemia induced by clamping the superior mesenteric artery and by ligating the inferior mesenteric artery for 60 min. After 120 or 240 min of reperfusion, tissue samples were collected for analysis. Cobalt protoporphyrin (CoPP) was administered IP at 10 or 20 mg/kg 24 h before IRI, to induce HO-1 upregulation. Control animals received vehicle alone. Tissue injury measurements included the following: histological changes, tissue myeloperoxidase (MPO) activity, nitrate/nitrite levels, and IL-6 levels. Results A significant HO-1 upregulation was demonstrated in pre-treated animals (p < 0.05, 95% CI: −0.84 to −0.05). Intestinal IL-6 mRNA expression levels were significantly reduced in animals treated with CoPP 20 mg/kg after 240 min of IRI (p < 0.05, 95% CI: 0.09–2.25). Significant reduction in MPO activity and NO products was observed in treated animals when compared to controls (p < 0.01, 95% CI: 0.07–0.24 and p < 0.01, 95% CI: 5.58–12.75, respectively). Conclusions Induction of HO-1 by CoPP administration before IRI was resulted in a significant reduction of intestinal tissue injury. Developing strategies to induce HO-1 upregulation before surgery will be important to reduce IRI in the clinical setting.

KW - Ischemia/reperfusion injury

KW - Heme oxygenase-1

KW - Intestine

U2 - 10.1016/j.ijsu.2006.06.001

DO - 10.1016/j.ijsu.2006.06.001

M3 - Journal article

VL - 6

SP - 64

EP - 70

JO - International Journal of Surgery

JF - International Journal of Surgery

SN - 1743-9191

IS - 1

ER -