Low reliability of anti-KIR4.183–120peptide auto-antibodies in multiple sclerosis patients

Mariapaola Marino, Gabriele Di Sante, Carlo Provenzano, Massimiliano Mirabella, Giovambattista Pani, Francesco Ria, Giovanni Frisullo, Daniela Maria Samengo, Emanuela Bartoccioni

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4 Citations (Scopus)


Background: Multiple sclerosis (MS) is an autoimmune disease for which auto-antibodies fully validated as diagnostic and prognostic biomarkers are widely desired. Recently, an immunoreactivity against the inward rectifying potassium channel 4.1 (KIR4.1) has been reported in a large proportion of a group of MS patients, with amino acids 83–120 being the major epitope. Moreover, a strong correlation between anti-KIR4.183–120and anti-full-length-protein auto-antibodies titer was reported. However, this finding received limited confirmation. Objective: Validation of the diagnostic potential of anti-KIR4.183–120antibodies in 78 MS patients, 64 healthy blood donors, and 42 individuals with other neurological diseases. Methods: Analysis of anti-KIR4.183–120antibodies by enzyme-linked immunosorbent assay (ELISA) using a mouse antiserum we produced as a new ELISA reliability control. Additionally, evaluation of reactivity against 293-T cells transiently transfected with full-length KIR4.1 by flow cytometry. Results: We found antibodies to KIR4.183–120only in 13 out of 78 (16.6%) MS patients; among these, only 2 were positive for anti-full-length KIR4.1 antibodies. Conclusion: Employing a new reliability control and a new cytofluorometric assay, we cannot support anti-KIR4.183–120auto-antibodies as a reliable biomarker in MS.
Original languageEnglish
Pages (from-to)910-918
Number of pages9
JournalMultiple Sclerosis
Publication statusPublished - 2018


  • KIR4.1
  • Neurology
  • Neurology (clinical)
  • auto-antibodies
  • biomarker
  • enzyme-linked immunosorbent assay
  • flow cytometry
  • multiple sclerosis


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