RESUMO
Mouse and human data implicate the NOD1 and NOD2 sensors of the intestinal microbiome and the associated signal transduction via the receptor interacting protein kinase 2 (RIPK2) as a potential key signaling node for the development of inflammatory bowel disease (IBD) and an attractive target for pharmacological intervention. The TRUC mouse model of IBD was strongly indicated for evaluating RIPK2 antagonism for its effect on intestinal inflammation based on previous knockout studies with NOD1, NOD2, and RIPK2. We identified and profiled the BI 706039 molecule as a potent and specific functional inhibitor of both human and mouse RIPK2 and with favorable pharmacokinetic properties. We dosed BI 706039 in the spontaneous TRUC mouse model from age 28 to 56 days. Oral, daily administration of BI 706039 caused dose-responsive and significant improvement in colonic histopathological inflammation, colon weight, and terminal levels of protein-normalized fecal lipocalin (all P values <0.001). These observations correlated with dose responsively increasing systemic levels of the BI 706039 compound, splenic molecular target engagement of RIPK2, and modulation of inflammatory genes in the colon. This demonstrates that a relatively low oral dose of a potent and selective RIPK2 inhibitor can modulate signaling in the intestinal immune system and significantly improve disease associated intestinal inflammation.NEW & NOTEWORTHY The RIPK2 kinase at the apex of microbiome immunosensing is an attractive target for pharmacological intervention. A low oral dose of a RIPK2 inhibitor leads to significantly improved intestinal inflammation in the murine TRUC model of colitis. A selective and potent inhibitor of the RIPK2 kinase may represent a new class of therapeutics that target microbiome-driven signaling for the treatment of IBD.
Assuntos
Colite Ulcerativa/tratamento farmacológico , Colo/efeitos dos fármacos , Inibidores de Proteínas Quinases/farmacologia , Proteína Serina-Treonina Quinase 2 de Interação com Receptor/antagonistas & inibidores , Animais , Disponibilidade Biológica , Células Cultivadas , Colite Ulcerativa/enzimologia , Colite Ulcerativa/genética , Colite Ulcerativa/patologia , Colo/enzimologia , Colo/patologia , Doença de Crohn/enzimologia , Doença de Crohn/patologia , Citocinas/genética , Citocinas/metabolismo , Proteínas de Ligação a DNA/genética , Modelos Animais de Doenças , Fezes/química , Humanos , Mediadores da Inflamação/metabolismo , Lipocalinas/metabolismo , Camundongos Endogâmicos BALB C , Camundongos Knockout , Modelos Biológicos , Monócitos/efeitos dos fármacos , Monócitos/metabolismo , Inibidores de Proteínas Quinases/farmacocinética , Proteína Serina-Treonina Quinase 2 de Interação com Receptor/genética , Proteína Serina-Treonina Quinase 2 de Interação com Receptor/metabolismo , Proteínas com Domínio T/genéticaRESUMO
IgE induced by type 2 immune responses in atopic dermatitis is implicated in the progression of atopic dermatitis to other allergic diseases, including food allergies, allergic rhinitis, and asthma. However, the keratinocyte-derived signals that promote IgE and ensuing allergic diseases remain unclear. Herein, in a mouse model of atopic dermatitis-like skin inflammation induced by epicutaneous Staphylococcus aureus exposure, keratinocyte release of IL36α along with IL-4 triggered B cell IgE class-switching, plasma cell differentiation, and increased serum IgE levels-all of which were abrogated in IL-36R-deficient mice or anti-IL36R-blocking antibody-treated mice. Moreover, skin allergen sensitization during S. aureus epicutaneous exposure-induced IL-36 responses was required for the development of allergen-specific lung inflammation. In translating these findings, elevated IL36 cytokines in human atopic dermatitis skin and in IL36 receptor antagonist-deficiency patients coincided with increased serum IgE levels. Collectively, keratinocyte-initiated IL36 responses represent a key mechanism and potential therapeutic target against allergic diseases.
Assuntos
Dermatite Atópica/imunologia , Imunoglobulina E/imunologia , Interleucina-1/imunologia , Queratinócitos/imunologia , Plasmócitos/imunologia , Staphylococcus aureus/imunologia , Animais , Diferenciação Celular/genética , Diferenciação Celular/imunologia , Dermatite Atópica/genética , Dermatite Atópica/microbiologia , Humanos , Switching de Imunoglobulina , Imunoglobulina E/genética , Interleucina-1/genética , Interleucina-4/genética , Interleucina-4/imunologia , Queratinócitos/microbiologia , Camundongos , Camundongos Knockout , Plasmócitos/patologiaRESUMO
An IgG mouse monoclonal antibody (10F05) against polyethylene glycol has been generated. The antibody reacts with PEG regardless of the linker used for PEG attachment, and is able to recognize a PEGylated peptide in plasma at concentrations as low as 3 pg/mL. The antibody is readily purified in substantial quantities. The PEG IgG will find significant utility in the sensitive detection of PEG derivitives during the pharmacokinetic characterization of PEGylated compounds.