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2.
Front Immunol ; 10: 3143, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-32038646

RESUMO

Mast cells are inflammatory immune cells that play an essential role in mediating allergic reactions in humans. It is well-known that mast cell activation is critically regulated by intracellular calcium ion (Ca2+) concentrations. MAS-related G-protein coupled receptor-X2 (MRGPRX2) is a G-protein coupled receptor (GPCR) expressed on mast cells that is activated by various ligands, including several FDA approved drugs; consequently, this receptor has been implicated in causing pseudo-allergic reactions in humans. MRGPRX2 activation leads to an increase in intracellular Ca2+ levels; however, the Ca2+ mobilizing mechanisms utilized by this receptor are largely unknown. Previous reports showed that store-operated Ca2+ entry (SOCE) via the calcium sensor, stromal interaction molecule 1 (STIM1), regulates mast cell response induced by the high-affinity IgE receptor (FcεRI). In this study, using complementary pharmacologic and genetic ablation approaches we demonstrate that SOCE through STIM1 promotes MRGPRX2-induced human mast cell response in vitro. Importantly, SOCE also critically modulates MrgprB2 (mouse ortholog of human MRGPRX2) dependent inflammation in in vivo mouse models of pseudo-allergy. Collectively, our data suggests that MRGPRX2/MrgprB2 activation of mast cells is dependent on SOCE via STIM1, and further characterization of the MRGPRX2-SOCE-STIM1 pathway will lead to the identification of novel targets for the treatment of pseudo-allergic reactions in humans.


Assuntos
Cálcio/imunologia , Mastócitos/imunologia , Proteínas do Tecido Nervoso/imunologia , Receptores Acoplados a Proteínas G/imunologia , Receptores de Neuropeptídeos/imunologia , Molécula 1 de Interação Estromal/imunologia , Animais , Cálcio/metabolismo , Humanos , Mastócitos/metabolismo , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos C57BL , Proteínas do Tecido Nervoso/genética , Receptores Acoplados a Proteínas G/genética , Receptores de Neuropeptídeos/genética , Rosácea/genética , Rosácea/imunologia , Rosácea/metabolismo , Molécula 1 de Interação Estromal/genética
3.
Cutis ; 91(3 Suppl): 1-8, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23833998

RESUMO

This article discusses rosacea, a common facial dermatosis of uncertain etiology and recent investigations that have begun to shed considerable light on the sequence of events leading to clinical manifestations of rosacea. The article content is based on a dedicated meeting about rosacea sanctioned by the American Acne & Rosacea Society (AARS) and represents the consensus of the authors and AARS Board of Directors.


Assuntos
Rosácea/fisiopatologia , Rosácea/terapia , Fármacos Dermatológicos/uso terapêutico , Ácidos Dicarboxílicos/uso terapêutico , Doxiciclina/uso terapêutico , Humanos , Imunidade Inata/fisiologia , Inflamação/imunologia , Inflamação/fisiopatologia , Terapia com Luz de Baixa Intensidade , Metronidazol/uso terapêutico , Rosácea/classificação , Rosácea/imunologia , Pele/irrigação sanguínea , Pele/imunologia , Pele/fisiopatologia , Telangiectasia/fisiopatologia , Células Th1/imunologia , Receptor 2 Toll-Like/imunologia , Vasodilatação/imunologia , Vasodilatação/fisiologia
5.
Ophthalmology ; 85(8): 779-86, 1978 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-152423

RESUMO

Eighteen patients with ocular rosacea were treated with oral tetracycline which resulted in marked improvement in all patients. Approximately one half of the patients were able to taper and stop the medication without recurrence of symptoms. The remaining have tapered their medication but could not stop without recurrence of symptoms. The majority of the patients in the series had Staphylococcus aureus on their conjunctiva and lids before and after surgery.


Assuntos
Oftalmopatias/diagnóstico , Rosácea/diagnóstico , Adulto , Idoso , Anticorpos , Conjuntivite/diagnóstico , Oftalmopatias/tratamento farmacológico , Oftalmopatias/imunologia , Oftalmopatias/microbiologia , Doenças Palpebrais/diagnóstico , Feminino , Humanos , Ceratite/diagnóstico , Masculino , Pessoa de Meia-Idade , Rosácea/tratamento farmacológico , Rosácea/imunologia , Rosácea/microbiologia , Staphylococcus aureus/isolamento & purificação , Tetraciclinas/uso terapêutico
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