Impact of dietary iron restriction on the development of monocrotaline-induced pulmonary vascular remodeling and right ventricular failure in rats

Autor: Takeshi Tsujino, Tohru Masuyama, Yoshitaka Okuhara, Shinichi Hirotani, Manami Hosokawa, Yoshiro Naito, Akiyo Eguchi, Hiroyuki Hao, Toshihiro Iwasaku, Hisashi Sawada, Seiichi Hirota, Mitsumasa Ohyanagi
Rok vydání: 2013
Předmět:
Zdroj: Biochemical and Biophysical Research Communications. 436:145-151
ISSN: 0006-291X
DOI: 10.1016/j.bbrc.2013.05.059
Popis: Pulmonary hypertension (PH) is characterized by pulmonary vascular remodeling leading to right ventricular (RV) failure. Recently, iron deficiency is reported to be prevalent in patients with PH. However, the mechanism by which iron deficiency occurs in patients with PH remains unknown. Here, we investigated the effects of dietary iron restriction on the development of monocrotaline-induced pulmonary vascular remodeling and the involved mechanisms. Male Sprague–Dawley rats were subcutaneously injected with monocrotaline (60 mg/kg). Afterwards, monocrotaline - injected rats were randomly divided into two groups and were given a normal diet ( n = 6) or an iron-restricted diet ( n = 6) for 4 weeks. Saline-injected rats given a normal diet were served as controls ( n = 6). Monocrotaline-injected rats showed pulmonary vascular remodeling, increased RV pressure, RV hypertrophy, and decreased RV ejection fraction, followed by RV failure after 4 weeks. In contrast, iron restriction attenuated the development of pulmonary vascular remodeling and RV failure. Of interest, expression of cellular iron transport protein, transferrin receptor 1 was increased in the pulmonary remodeled artery and the failing right ventricle of monocrotaline-injected rats, as compared with the controls. Moreover, a key regulator of iron homeostasis, hepcidin gene expression was increased in the failing right ventricle of monocrotaline-injected rats. Iron restriction attenuated the development of monocrotaline-induced pulmonary vascular remodeling and RV failure. Cellular iron transport might be involved in the pathophysiology of PH and PH induced RV failure.
Databáze: OpenAIRE