Najmossadat Atefi; Mehdi Tabaie; Samile Noorbakhsh; Azarmidokht Tabatabaie; Mohammadreza Rezaee; Masomeh Rohaninasab
Volume 15, Issue 1 , 2012, , Pages 1-3
Abstract
Background: T cell activation is discussed as an important factor in the pathogenesis of psoriasis. Recently, a lot of attention has been paid to the role of superantigens in T cell activation in the pathogenesis of psoriasis. In this study, the role of staphylococcal superantigens in the pathogenesis ...
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Background: T cell activation is discussed as an important factor in the pathogenesis of psoriasis. Recently, a lot of attention has been paid to the role of superantigens in T cell activation in the pathogenesis of psoriasis. In this study, the role of staphylococcal superantigens in the pathogenesis of psoriasis with identification of staphylococcal toxin levels in the skin lesions of patients with chronic plaque psoriasis has been studied. Method: In this case-control study, biopsies were taken from the skin of 40 patients with chronic plaque type psoriasis and 40 controls. Staphylococcal superantigens such as staphylococcus enterotoxin A, staphylococcus enterotoxin C, and toxic shock syndrome toxin 1 were investigated using polymerase chain reaction. Result: Staphylococcus aureus was isolated from 6.5% of the psoriasis patients and 2.5% of the individuals in the control group and all of them were toxin producer. There was a significant difference between controls and patients. Conclusion: Bacterial superantigens probably play an important role in the pathogenesis of chronic plaque type psoriasis.
Mohammad Shahidi–Dadras; Parviz Toossi; Nima Sarrafi–Rad; Reza Mahmoud Robati; Marjan Saeedi; Sima Kavand
Volume 12, Issue 1 , 2009, , Pages 1-3
Abstract
Background: The aggravating role of Staphylococcus aureus is well known in atopic dermatitis but has not yet been proven in psoriasis. The role of Staphylococcus aureus superantigens is emphasized in the initiation, maintenance and complications of psoriasis. We investigated the frequency of nasal, axillary, ...
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Background: The aggravating role of Staphylococcus aureus is well known in atopic dermatitis but has not yet been proven in psoriasis. The role of Staphylococcus aureus superantigens is emphasized in the initiation, maintenance and complications of psoriasis. We investigated the frequency of nasal, axillary, and perineal carriage of Staphylococcus aureus (SA) in patients with psoriasis and its possible influence on the severity of the disease. Methods: one hundred patients with the clinical diagnosis of psoriasis participated in the study. Cultures of the bacterial flora were obtained from the right and left axilla and nasal nares and perineum, inoculated on standard bacterial medium (blood agar), and incubated at 37°C degrees for 48 h. Results: one hundred patients with the clinical diagnosis of psoriasis (42% female and 58% male) comprised the study group. Mean age of the patients was 41.1±17.1 years. About 42 % of the patients carried S. aureus; of these, 32 % were from the nose, 13 % from axilla, and 11% from the perineum. Three patients were carriers in all 3 sites. There was no significant difference in the severity of the disease between the carriers and non-carriers measured by the psoriasis area and severity index (PASI) score. Conclusions: According to our findings, S.aureus carriage in psoriasis had no significant influence on disease severity. It might be relevant for a subgroup of patients only when superantigen productions are found.
