Antibody Response to Crude Cell Lysate of Propionibacterium acnes and Induction of Pro-Inflammatory Cytokines in Patients with Acne and Normal Healthy Subjects

  • Basal, E. (Department of Microbiology, KGMU, Lucknow, INDIA) ;
  • Jain, A. (Department of Microbiology, KGMU, Lucknow, INDI) ;
  • Kaushal, G.P. (Department of Medicine, KGMU, Lucknow, INDIA)
  • Published : 2004.06.01


Propionibacterium acnes (P. acnes) plays an important role in the disease pathogenesis of acne vulgaris, a disorder of pilosebaceous follicles, seen primarily in the adolescent age group. In the present study, the presence of antibodies against P. acnes (MTCC1951) were detected in acne patient (n=50) and disease free controls (n=25) using dot-ELISA and Western blot assay. The ability of P. acnes to induce pro-inflammatory cytokines by human peripheral blood mononuclear cells (PBMCs), obtained from acne patients and healthy subjects, were also analysed. The patients (n=26) who were culture positive for skin swab culture, were found to have a more advanced disease and higher antibody titres (1:4000 to >1:16000) compared to the P. acnes negative patients (n=24) and normal controls (n=25). An analysis of patients' sera by western blot assay recognized a number of antigenic components of P. acnes, rang-ing from 29 to 205 kDa. The major reactive component was an approximately 96 kDa polypeptide, which was recognised in 92% (24 of 26) of the patients sera. Further, the P. acnes culture supernatant, crude cell lysate and heat killed P. acnes whole cells, obtained from 72-h incubation culture, were observed to be able to induce significant amounts of IL-8 and tumor necrosis factor alpha (TNF-${\alpha}$) by the PBMCs in both the healthy subjects and patients, as analysed by cytokine-ELISA. The levels of cytokines were significantly higher in the patients than the healthy subjects. A major 96 kDa polypep-tide reactant was eluted from the gel and was found to cause dose dependent stimulation of the pro-ductions of IL-8 and TNF-${\alpha}$. Thus, the above results suggest that both humoral and pro-inflammatory responses play major roles in the pathogenesis of acne.


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