Activation of lung p53 by Nutlin-3a prevents and reverses experimental pulmonary hypertension.
نویسندگان
چکیده
BACKGROUND Induction of cellular senescence through activation of the p53 tumor suppressor protein is a new option for treating proliferative disorders. Nutlins prevent the ubiquitin ligase MDM2 (murine double minute 2), a negative p53 regulator, from interacting with p53. We hypothesized that cell senescence induced by Nutlin-3a exerted therapeutic effects in pulmonary hypertension (PH) by limiting the proliferation of pulmonary artery smooth muscle cells (PA-SMCs). METHODS AND RESULTS Nutlin-3a treatment of cultured human PA-SMCs resulted in cell growth arrest with the induction of senescence but not apoptosis; increased phosphorylated p53 protein levels; and expression of p53 target genes including p21, Bax, BTG2, and MDM2. Daily intraperitoneal Nutlin-3a treatment for 3 weeks dose-dependently reduced PH, right ventricular hypertrophy, and distal pulmonary artery muscularization in mice exposed to chronic hypoxia or SU5416/hypoxia. Nutlin-3a treatment also partially reversed PH in chronically hypoxic or transgenic mice overexpressing the serotonin-transporter in SMCs (SM22-5HTT+ mice). In these mouse models of PH, Nutlin-3a markedly increased senescent p21-stained PA-SMCs; lung p53, p21, and MDM2 protein levels; and p21, Bax, PUMA, BTG2, and MDM2 mRNA levels; but induced only minor changes in control mice without PH. Marked MDM2 immunostaining was seen in both mouse and human remodeled pulmonary vessels, supporting the use of Nutlins as a PH-targeted therapy. PH prevention or reversal by Nutlin-3a required lung p53 stabilization and increased p21 expression, as indicated by the absence of Nutlin-3a effects in hypoxia-exposed p53(-/-) and p21(-/-) mice. CONCLUSIONS Nutlin-3a may hold promise as a prosenescence treatment targeting PA-SMCs in PH.
منابع مشابه
Activation of Lung p53 by Nutlin-3a Prevents and Reverses Experimental Pulmonary Hypertension Running title: Mouraret et al.; Role of Cell Senescence in Pulmonary Hypertension
Background—Induction of cellular senescence through activation of the p53 tumor suppressor
متن کاملNew hope for Nutlin-3a therapy for pulmonary arterial hypertension
Pulmonary Arterial Hypertension (PH) is a chronic, progressive, and fatal lung disease characterized by narrowing of pulmonary arteries associated with muscular thickening and intimal proliferation, known as remodeling. If untreated, the 5-year survival rate of PH is 34% (McLaughlin et al., 2002). Unfortunately, there is no systematic strategy established to effectively manage this devastating ...
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ورودعنوان ژورنال:
- Circulation
دوره 127 16 شماره
صفحات -
تاریخ انتشار 2013