BACKGROUND: Patients with rosacea demonstrate a higher density of Demodex mites in their skin than do controls. A bacterium isolated from a Demodex mite from a patient with papulopustular rosacea (PPR) was previously shown to provoke an immune response in patients with PPR or ocular rosacea, thus suggesting a possible role for bacterial proteins in the aetiology of this condition. OBJECTIVES: To examine the response of neutrophils to proteins derived from a bacterium isolated from a Demodex mite. METHODS: Bacterial cells were lysed and proteins were partially purified by ÄKTA fast protein liquid chromatography. Isolated neutrophils were exposed to bacterial proteins and monitored for alterations in migration, degranulation and cytokine production. RESULTS: Neutrophils exposed to proteins from Bacillus cells demonstrated increased levels of migration and elevated release of matrix metalloprotease 9, an enzyme known to degrade collagen, and cathelicidin, an antimicrobial peptide. In addition, neutrophils exposed to the bacterial proteins demonstrated elevated rates of interleukin 8 and tumour necrosis factor-α production. CONCLUSIONS: Proteins produced by a bacterium isolated from a Demodex mite have the ability to increase the migration, degranulation and cytokine production abilities of neutrophils. These results suggest that bacteria may play a role in the inflammatory erythema associated with rosacea.
BACKGROUND:Patients with rosacea demonstrate a higher density of Demodex mites in their skin than do controls. A bacterium isolated from a Demodex mite from a patient with papulopustular rosacea (PPR) was previously shown to provoke an immune response in patients with PPR or ocular rosacea, thus suggesting a possible role for bacterial proteins in the aetiology of this condition. OBJECTIVES: To examine the response of neutrophils to proteins derived from a bacterium isolated from a Demodex mite. METHODS: Bacterial cells were lysed and proteins were partially purified by ÄKTA fast protein liquid chromatography. Isolated neutrophils were exposed to bacterial proteins and monitored for alterations in migration, degranulation and cytokine production. RESULTS: Neutrophils exposed to proteins from Bacillus cells demonstrated increased levels of migration and elevated release of matrix metalloprotease 9, an enzyme known to degrade collagen, and cathelicidin, an antimicrobial peptide. In addition, neutrophils exposed to the bacterial proteins demonstrated elevated rates of interleukin 8 and tumour necrosis factor-α production. CONCLUSIONS: Proteins produced by a bacterium isolated from a Demodex mite have the ability to increase the migration, degranulation and cytokine production abilities of neutrophils. These results suggest that bacteria may play a role in the inflammatory erythema associated with rosacea.
Authors: Fred McMahon; Nessa Banville; David A Bergin; Christian Smedman; Staffan Paulie; Emer Reeves; Kevin Kavanagh Journal: Inflammation Date: 2016-02 Impact factor: 4.092
Authors: Bo Young Chung; Hye One Kim; Chun Wook Park; Na Gyeong Yang; Jae Yun Kim; Yun Su Eun; Euy Hyun Chung; Sung Yul Lee; Young Lip Park; Sang Hoon Lee; Nam Hun Heo; Min Jeong Shin; Jung Eun Kim Journal: Biomed Res Int Date: 2022-07-04 Impact factor: 3.246