Published online before print January 20, 2005, doi: 10.1161/01.RES.0000156889.22364.f1
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© 2005 American Heart Association, Inc.
Integrative Physiology |
Lesion Development and Response to Immunization Reveal a Complex Role for CD4 in Atherosclerosis
From the Department of Medicine and Centre for Molecular Medicine (X.Z., A.-K.L.R., G.K.H.), Karolinska University Hospital, Stockholm; and the Center for Nutrition and Toxicology (M.R., P.P.), Novum, and CME, Karolinska University Hospital at Huddinge, Sweden.
Correspondence to X. Zhou, MD, PhD, CMM L8:03, Karolinska Hospital, SE-17176 Stockholm, Sweden. E-mail Xinghua.Zhou{at}cmm.ki.se
Atherosclerosis is a complex disease, bearing many of the characteristics of a chronic inflammatory process. Both cellular and humoral immune responses may be involved in the disease development. Oxidized low-density lipoprotein (oxLDL) is suggested to be an autoantigen in atherosclerosis. A protective effect against atherosclerosis has been demonstrated in animals immunized with oxLDL. Such a protection is associated with elevation of T cell–dependent IgG antibodies against oxLDL. In addition, it has been shown that immunization with Freund adjuvant alone also confers protection against development of atherosclerosis. We therefore hypothesized that CD4+ T cells are critical in the development of atherosclerosis and that they are involved in protective immune reactions after immunization. The development of atherosclerosis was studied in apolipoprotein E knockout (apoE KO) mice and CD4/apoE double knockout (dKO) mice that were immunized with either oxLDL in Freund adjuvant or adjuvant alone, or left untreated. Our results show that (1) the absence of CD4+ cells in apoE KO mice leads to reduced atherosclerosis, indicating that CD4+ cells constitute a major proatherogenic cell population, and (2) the atheroprotective effect of LDL immunization does not depend on CD4+ cells, whereas (3) the atheroprotective effect of adjuvant injection is CD4-dependent. These findings demonstrate complex roles of immune cell-cell interactions in the regulation of the atherosclerotic process and point to several possible targets in the treatment and prevention of atherosclerosis.
Key Words: atherosclerosis • vaccine • low-density lipoprotein • CD4+ T lymphocytes • antibodies
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