Résumé
BACKGROUND: Acne vulgaris is a disease of the pilosebaceous unit characterized by increased sebum production, hyperkeratinization, and immune responses to Propionibacterium acnes (PA). Here, we explore a possible mechanism by which a lipid receptor, G2A, regulates immune responses to a commensal bacterium. OBJECTIVE: To elucidate the inflammatory properties of G2A in monocytes in response to PA stimulation. Furthermore, our study sought to investigate pathways by which lipids modulate immune responses in response to PA. METHODS: Our studies focused on monocytes collected from human peripheral blood mononuclear cells, the monocytic cell line THP-1, and a lab strain of PA. Our studies involved the use of enzyme-linked immunosorbent, Western blot, reverse transcription polymerase chain reaction, small interfering RNA (siRNA), and microarray analysis of human acne lesions in the measurements of inflammatory markers. RESULTS: G2A gene expression is higher in acne lesions compared to normal skin and is inducible by the acne therapeutic, 13-cis-retinoic acid. In vitro, PA induces both the Toll-like receptor 2-dependent expression of G2A as well as the production of the G2A ligand, 9-hydroxyoctadecadienoic acid, from human monocytes. G2A gene knockdown through siRNA enhances PA stimulation of interleukin (IL)-6, IL-8, and IL-1β possibly through increased activation of the ERK1/2 MAP kinase and nuclear factor kappa B p65 pathways. CONCLUSION: G2A may play a role in quelling inflammatory cytokine response to PA, revealing G2A as a potential attenuator of inflammatory response in a disease associated with a commensal bacterium.
Sujets)
Humains , Acné juvénile , Technique de Western , Lignée cellulaire , Cytokines , Expression des gènes , Techniques de knock-down de gènes , Techniques in vitro , Interleukine-8 , Interleukines , Isotrétinoïne , Analyse sur microréseau , Monocytes , Facteur de transcription NF-kappa B , Phosphotransferases , Réaction de polymérisation en chaîne , Propionibacterium acnes , Propionibacterium , Transcription inverse , Petit ARN interférent , Sébum , Peau , Récepteurs de type TollRésumé
Objective:To evaluate resection of submandibular gland through a minimal skin incision under the endoscope. Method:A retrospective analysis of the clinical data from 28 cases of submandibular gland resection by endoscope surgery via subclavian approach, 14 cases of preoperative diagnosis of pleomorphic adenoma, submandibular gland of chronic inflammation in 11 cases, 3 cases of the submandibular gland stone,one case of lymphatic cyst,all cases were evaluated by preoperative imaging or 3 d sonography. Result:All patients' submandibular gland and tumors were resected totally under the endoscope, no open surgery, no surgical complications, and postoperative aesthetic outcome was good, patients were satisfied, pleomorphic adenoma patients were postoperative followed up of 4 to 24 months, and no recurrence. Conclusion:Under the cavity mirror via subclavian path submandibular gland resection is safe and feasible, and has a good cosmetic effect.