Administration of antisense oligonucleotides to Gα Q/11 reduces the severity of murine lupus

Abstract

Our principle hypothesis is that the hypothalamic hormone, gonadotropin-releasing hormone (GnRH), is an immunostimulatory hormone and plays a pivotal role in the gender differences in immunity and/or autoimmunity. As a general rule, females display heightened immune responses and heightened endocrinological responsiveness to GnRH compared to males. We have previously demonstrated that GnRH receptor antagonists are effective in ameliorating murine lupus and that GnRH receptor agonists exacerbate murine lupus. GnRH exerts its actions via stimulatory G proteins, specifically via Gα s and the homologous G proteins Gα q and Gα 11 (referred to together as Gα q/11). We have previously demonstrated that females express higher levels of Gα q/11 mRNA and protein compared to males. We hypothesized that antisense inhibition of these specific G proteins would lead to a reduction in inflammatory cytokines and to an amelioration of disease in a mouse model of lupus. We randomized gonadectomized female (NZB × NZW) F1 hybrid mice to treatment with antisense oligonucleotides to Gα q/11 or to missense oligonucleotides. Administration of antisense oligonucleotides to Gα q/11 led to significant reductions in autoantibody levels, serum IgG levels, hematuria, and proteinuria compared to missense oligos. A trend toward prolonged survival was also noted. In vitro co-culture experiments demonstrated that antisense to Gα q/11 significantly inhibited IL–6 production compared to control.