Increased Expression of Interleukin-1β and Monocyte Chemotactic and Activating Factor/Monocyte Chemoattractant Protein-1 in the Hypertrophied and Failing Heart With Pressure Overload

Author:

Shioi Tetsuo1,Matsumori Akira1,Kihara Yasuki1,Inoko Moriaki1,Ono Koh1,Iwanaga Yoshitaka1,Yamada Takehiko1,Iwasaki Atsushi1,Matsushima Kouji1,Sasayama Shigetake1

Affiliation:

1. From the Department of Cardiovascular Medicine (T.S., A.M., Y.K., M.I., K.O., Y.I., T.Y., A.I, S.S.), Kyoto (Japan) University; the Department of Pharmacology (K.M.), Cancer Research Institution, Kanazawa (Japan) University; and the Department of Molecular Preventive Medicine (K.M.), School of Medicine, University of Tokyo (Japan).

Abstract

Abstract Studies on the effects of proinflammatory cytokines on the heart suggest that they play some roles in the pathogenesis of congestive heart failure (CHF). To determine the involvement of proinflammatory cytokine in cardiac hypertrophy and CHF induced by mechanical overload, we investigated the expression of interleukin (IL)-1β and monocyte chemotactic and activating factor (MCAF)/monocyte chemoattractant protein-1 (MCP-1) in the left ventricle (LV) of Dahl salt-sensitive (DS) rats that showed hypertrophy of the LV induced by hypertension and subsequently developed CHF. The IL-1β mRNA content in the LV of DS rats increased 3.9-fold when LV hypertrophy developed, and the increase reached 6.2-fold at the CHF stage compared with that of age-matched Dahl salt-resistant (DR) rats. The amount of IL-1β in the LV was positively correlated with the LV weight/body weight ratio. Most of the IL-1β immunoreactivity was localized in the endothelial cells and interstitial macrophages. The mRNA levels of MCAF in the LV increased 3.6-fold at 11 weeks and reached 4.8-fold at the CHF stage relative to the age-matched DR rats. MCAF protein was localized to the endothelial cells and interstitial macrophages. In DS rats, the number of interstitial macrophages increased diffusely throughout the LV. We suggest that increased chemokine expression, macrophage infiltration, and proinflammatory cytokine expression play some role in the pathogenesis of cardiac hypertrophy and failure induced by chronic mechanical overload.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Cardiology and Cardiovascular Medicine,Physiology

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