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Effect of angiotensin II type I receptor blocker losartan on bone deterioration in orchiectomized male hypertensive and normotensive rats / 中华医学杂志(英文版)
Chinese Medical Journal ; (24): 2661-2665, 2013.
Artigo em Inglês | WPRIM | ID: wpr-322134
ABSTRACT
<p><b>BACKGROUND</b>Epidemiological study showed that the use of angiotensin-converting enzyme inhibitors was associated with higher bone mineral density (BMD) in older people, especially male subjects, which suggested that angiotensin II may have a detrimental effect on bone. Therefore, blocking its effect may have a beneficial effect on bone health.</p><p><b>METHODS</b>Six-month-old male spontaneously hypertensive rats (SHR) and normotensive Wistar Kyoto rats (WKY) were used. Animals of each model were randomly assigned to the following four groups Group 1, SHAM operated+vehicle; Group 2, orchidectomy (ORX)+vehicle; Group 3, ORX+low-dose losartan (10 mg×kg(-1)×d(-1)); and Group 4, ORX+high-dose losartan (25 mg×kg(-1)×d(-1)). Blood pressure was recorded weekly. SHAM and ORX operations were performed, followed by daily losartan and vehicle treatment from day 4 after operation for 16 weeks. Serum and 24-hour urine samples were collected for measurement of bone turnover markers before euthanasia and then the left femur was collected for measurements of BMD and microarchitecture before mechanical test.</p><p><b>RESULTS</b>Urine deoxypyridinoline/urine creatinine (DPD/Cr) ratio was significantly higher in SHR than in WKY. BMD and microarchitecture parameters also showed bone deterioration in SHR. After ORX, serum osteocalcin concentration decreased and urine DPD/Cr ratio increased significantly accompanied by a significant decrease in cortical and trabecular BMD and cortical bone thickness in both WKY and SHR. High-dose losartan significantly increased DPD in urine in both SHR and WKY. Apart from marginal favorable changes in bone architecture in WKY treated with high-dose losartan, losartan did not show significant effect on BMD, bone area, bone microarchitecture, and mechanical properties in both SHR and WKY.</p><p><b>CONCLUSION</b>Angiotensin II type I receptor blocker losartan was not able to demonstrate significant effect on ORX-induced bone deterioration in both hypertensive and normotensive rats.</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Patologia / Ratos Endogâmicos SHR / Ratos Endogâmicos WKY / Sístole / Osso e Ossos / Orquiectomia / Densidade Óssea / Losartan / Usos Terapêuticos / Bloqueadores do Receptor Tipo 1 de Angiotensina II Limite: Animais Idioma: Inglês Revista: Chinese Medical Journal Ano de publicação: 2013 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Patologia / Ratos Endogâmicos SHR / Ratos Endogâmicos WKY / Sístole / Osso e Ossos / Orquiectomia / Densidade Óssea / Losartan / Usos Terapêuticos / Bloqueadores do Receptor Tipo 1 de Angiotensina II Limite: Animais Idioma: Inglês Revista: Chinese Medical Journal Ano de publicação: 2013 Tipo de documento: Artigo