title: Therapeutic Intervention in Multiple Sclerosis with Alpha B-Crystallin: A Randomized Controlled Phase IIa Trial.
abstract: As a molecular chaperone and activator of Toll-like receptor 2-mediated protective responses by microglia and macrophages, the small heat shock protein alpha B-crystallin (HspB5) exerts therapeutic effects in different animal models for neuroinflammation, including the model for multiple sclerosis (MS). Yet, HspB5 can also stimulate human antigen-specific memory T cells to release IFN-γ, a cytokine with well-documented detrimental effects during MS. In this study, we explored in a Phase IIa randomized clinical trial the therapeutic application of HspB5 in relapsing-remitting MS (RR-MS), using intravenous doses sufficient to support its protective effects, but too low to trigger pathogenic memory T-cell responses. These sub-immunogenic doses were selected based on in vitro analysis of the dose-response profile of human T cells and macrophages to HspB5, and on the immunological effects of HspB5 in healthy humans as established in a preparatory Phase I study. In a 48-week randomized, placebo-controlled, double-blind Phase IIa trial, three bimonthly intravenous injections of 7.5, 12.5 or 17.5 mg HspB5 were found to be safe and well tolerated in RR-MS patients. While predefined clinical endpoints did not differ significantly between the relatively small groups of MS patients treated with either HspB5 or placebo, repeated administration especially of the lower doses of HspB5 led to a progressive decline in MS lesion activity as monitored by magnetic resonance imaging (MRI), which was not seen in the placebo group. Exploratory linear regression analysis revealed this decline to be significant in the combined group receiving either of the two lower doses, and to result in a 76% reduction in both number and total volumes of active MRI lesions at 9 months into the study. These data provide the first indication for clinical benefit resulting from intervention in RR-MS with HspB5.
  
  
  BACKGROUND
  ClinicalTrials.gov Phase I: NCT02442557; Phase IIa: NCT02442570.
authors.affiliation: Delta Crystallon, Leiden, The Netherlands.
authors.forename: Johannes M
authors.initials: JM
authors.lastname: van Noort
authors.affiliation: Delta Crystallon, Leiden, The Netherlands.
authors.forename: Malika
authors.initials: M
authors.lastname: Bsibsi
authors.affiliation: Delta Crystallon, Leiden, The Netherlands.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Nacken
authors.affiliation: Delta Crystallon, Leiden, The Netherlands.
authors.forename: Richard
authors.initials: R
authors.lastname: Verbeek
authors.affiliation: Delta Crystallon, Leiden, The Netherlands.
authors.forename: Edna H G
authors.initials: EH
authors.lastname: Venneker
mesh_terms: D000328:Adult; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000188:drug therapy*; D020529:Multiple Sclerosis, Relapsing-Remitting / Q000188:drug therapy; D016896:Treatment Outcome; D038203:alpha-Crystallin B Chain / Q000008:administration & dosage* / Q000627:therapeutic use*
chemical_list: D038203:alpha-Crystallin B Chain