Dose-Dependent Induction of an Idiotypic Cascade by Anti-Glycosaminoglycan Monoclonal Antibody in apoE-/-Mice: Association with Atheroprotection.
Atherosclerosis, the underlying pathology of most cardiovascular diseases, is triggered by the retention of apolipoprotein B (apoB)-containing lipoproteins in the arterial wall through electrostatic interactions with glycosaminoglycan (GAG) side chains of proteoglycans. Previously, we reported the antiatherogenic properties of the chimeric monoclonal antibody (mAb) chP3R99-LALA, which binds sulfated GAGs, inhibits low-density lipoprotein (LDL)-chondroitin sulfate (CS) association, and abrogates LDL oxidation and foam cell formation. In preventive and therapeutic settings, apoE-deficient (apoE-/-) mice immunized with 50 μg of this mAb showed reduced atherosclerotic lesions related with the induction of autologous anti-GAG antibodies. Knowing that age and sex are major non-modifiable risk factors in the development of atherosclerosis, the present study aimed to assess the influence of these variables on the capacity of chP3R99-LALA mAb to generate an anti-CS antibody response. Also, we aimed at defining the impact of the dose of chP3R99-LALA on the anti-CS antibody induction and the atheroprotective effect of this mAb in apoE-/-mice. Neither age nor sex had an impact in the IgG anti-CS antibody response induced by s.c. immunization with this mAb. Moreover, chP3R99-LALA mAb reduced atherosclerotic lesions to a similar extent in both young male and female apoE-/-mice fed a hypercholesterolemic diet and, in middle-aged female apoE-/-mice, with spontaneous lesions. On the other hand, increasing the dose of chP3R99-LALA (200 vs. 50 μg) elicited an anti-idiotype antibody cascade characterized by higher levels of anti-idiotype (Ab2), anti-anti-idiotype (Ab3), and anti-CS antibody responses. Moreover, this dose increment resulted in a striking reduction of aortic atherosclerotic lesions in immunized mice.
Division of Immunobiology, Center of Molecular Immunology , Havana , Cuba.
Roger
R
Sarduy
Division of Immunobiology, Center of Molecular Immunology , Havana , Cuba.
Victor
V
Brito
Division of Immunobiology, Center of Molecular Immunology , Havana , Cuba.
Adriana
A
Castillo
Division of Immunobiology, Center of Molecular Immunology , Havana , Cuba.
Yosdel
Y
Soto
Division of Immunobiology, Center of Molecular Immunology , Havana , Cuba.
Tania
T
Griñán
Faculté de Pharmacie, Université de Montréal , Montréal, QC , Canada.
Sylvie
S
Marleau
Innovation Managing Direction, Center of Molecular Immunology , Havana , Cuba.
Ana María
AM
Vázquez
antibodies; atheroprotection; atherosclerosis; glycosaminoglycans; idiotypic cascade; monoclonal antibody