RESUMO
1. The role of allopurinol in the protection of kidney function following ischaemia-reperfusion injury has been investigated using the novel technique of near-infrared spectroscopy. 2. An in vivo model of rat kidney ischaemia was used, with the expected falls in blood and tissue oxygenation seen and confirmed by near-infrared spectroscopy. 3. Allopurinol infusion increased the rate of reperfusion of oxygenated blood seen in control rats (P < 0.05). 4. Allopurinol enhanced the rate of tissue oxygenation during early reperfusion (P < 0.01). 5. This study provides further evidence for the proposed benefits of allopurinol in ischaemia-reperfusion injury. Furthermore, the potential of near-infrared spectroscopy as a technique of value in interventional studies of this nature is confirmed.
Assuntos
Alopurinol/uso terapêutico , Rim/irrigação sanguínea , Traumatismo por Reperfusão/prevenção & controle , Animais , Hemoglobinas/metabolismo , Isquemia/sangue , Isquemia/patologia , Isquemia/terapia , Rim/patologia , Masculino , Oxiemoglobinas/metabolismo , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley , Traumatismo por Reperfusão/sangue , Traumatismo por Reperfusão/patologiaRESUMO
1. The binding of angiotensin II to glomerular receptors was studied in spontaneously hypertensive and normotensive Wistar-Kyoto rats in response to 7, 16 and 32% isocaloric, isonatraemic protein diets. 2. Increased dietary protein elevated the systemic angiotensin II levels of both spontaneously hypertensive and Wistar-Kyoto rats [F0.05(2,26) = 4.758, P less than 0.05; n = 36], and this was not associated with changes in either systemic blood pressure or cortical renin activity. 3. Furthermore, no significant changes in the affinity or density of angiotensin II receptors were associated with changes of dietary protein intake in either strain. 4. These results indicate a dissociation between the system renin-angiotensin system and the tissue renin-angiotensin system in response to protein intake.