Leptin regulates neointima formation after arterial injury through mechanisms independent of blood pressure and the leptin receptor/STAT3 signaling pathways involved in energy balance.
نویسندگان
چکیده
BACKGROUND Leptin is an adipocyte-derived hormone critical for energy homeostasis and implicated in vascular disease processes. The relevant cellular leptin receptor pools and signaling pathways involved in leptin-related vascular phenotypes in vivo are unclear. METHODS AND RESULTS Arterial injury was induced in wild-type (wt), leptin-deficient (lep(ob/ob)), and leptin receptor-deficient (lepr(db/db)) mice. Compared with wt mice, lep(ob/ob) and lepr(db/db) mice were protected from the development of neointima. Bone marrow transplantation experiments between wt and lepr(db/db) mice indicated that the vascular protection in lepr(db/db) mice was not attributable to lack of leptin receptor expression on bone marrow-derived elements. To investigate the role of the lepr-mediated signal transducer and activator of transcription 3 (STAT3) signaling pathway in the response to vascular injury, lepr(s/s) mice homozygous for a leptin receptor defective in STAT3 signaling underwent femoral arterial injury. Despite similar obesity and blood pressure levels, the neointimal area in lepr(s/s) mice was significantly increased compared with lepr(db/db) mice. CONCLUSIONS The molecular mechanism by which the leptin receptor mediates neointima formation and vascular smooth muscle cell proliferation is largely independent of the STAT3-dependent signaling pathways involved in energy balance.
منابع مشابه
Independent of Blood Pressure and the Leptin Receptor/STAT3 Signaling Pathways Leptin Regulates Neointima Formation After Arterial Injury Through Mechanisms
Peter F. Bodary, Yuechun Shen, Miina Öhman, Kristina L. Bahrou, Fernando B. Vargas, Sarah Involved in Energy Balance Independent of Blood Pressure and the Leptin Receptor/STAT3 Signaling Pathways Leptin Regulates Neointima Formation After Arterial Injury Through Mechanisms Print ISSN: 1079-5642. Online ISSN: 1524-4636 Copyright © 2006 American Heart Association, Inc. All rights reserved. Greenv...
متن کاملPropranolol Prevents Osteoporosis and up-regulates Leptin in Ovariectomized Rats
Osteoporosis is a systemic skeletal disease and there is a close relationship between the sympathetic nervous system (SNS) and bone metabolism. Leptin has been shown to regulate bone formation and bone resorption via the SNS. However, the effect of SNS on leptin signaling has not been clearly understood. In the present study, we studied the effect of propranolol on ovariectomy-induced osteoporo...
متن کاملPropranolol Prevents Osteoporosis and up-regulates Leptin in Ovariectomized Rats
Osteoporosis is a systemic skeletal disease and there is a close relationship between the sympathetic nervous system (SNS) and bone metabolism. Leptin has been shown to regulate bone formation and bone resorption via the SNS. However, the effect of SNS on leptin signaling has not been clearly understood. In the present study, we studied the effect of propranolol on ovariectomy-induced osteoporo...
متن کاملThe role of SOCS-3 protein in leptin resistance and obesity.
Obesity is one of the risk factors in various chronic diseases and malignancy. It may result from excess accumulation of body fat. This condition may be caused by dysfunction of appetite-regulating pathways and energy balance due to leptin resistance. Leptin, a 16 kDa hormone, is the most important regulator of appetite and energy balance in the body. Most individuals with obesity have leptin r...
متن کاملRole of proopiomelanocortin neuron Stat3 in regulating arterial pressure and mediating the chronic effects of leptin.
Although signal transducer and activator of transcription 3 (Stat3) is a key second messenger by which leptin regulates appetite and body weight, its role in specific neuronal populations in metabolic regulation and in mediating the chronic effects of leptin on blood pressure is unknown. The current study tested the hypothesis that Stat3 signaling in proopiomelanocortin (POMC) neurons mediates ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Arteriosclerosis, thrombosis, and vascular biology
دوره 27 1 شماره
صفحات -
تاریخ انتشار 2007