The TGF-ß inhibitory activity of antibody 37E1B5 depends on its H-CDR2 glycan.
MAbs
; 9(1): 104-113, 2017 01.
Article
em En
| MEDLINE
| ID: mdl-27834568
ABSTRACT
Excessive transforming growth factor (TGF)-ß is associated with pro-fibrotic responses in lung disease, yet it also plays essential roles in tissue homeostasis and autoimmunity. Therefore, selective inhibition of excessive and aberrant integrin-mediated TGF-ß activation via targeting the α-v family of integrins is being pursued as a therapeutic strategy for chronic lung diseases, to mitigate any potential safety concerns with global TGF-ß inhibition. In this work, we reveal a novel mechanism of inhibiting TGF-ß activation utilized by an αvß8 targeting antibody, 37E1B5. This antibody blocks TGF-ß activation while not inhibiting cell adhesion. We show that an N-linked complex-type Fab glycan in H-CDR2 of 37E1B5 is directly involved in the inhibition of latent TGF-ß activation. Removal of the Fab N-glycosylation site by single amino acid substitution, or removal of N-linked glycans by enzymatic digestion, drastically reduced the antibody's ability to inhibit latency-associated peptide (LAP) and αvß8 association, and TGF-ß activation in an αvß8-mediated TGF-ß signaling reporter assay. Our results indicate a non-competitive, allosteric inhibition of 37E1B5 on αvß8-mediated TGF-ß activation. This unique, H-CDR2 glycan-mediated mechanism may account for the potent but tolerable TGF-b activation inhibition and lack of an effect on cellular adhesion by the antibody.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Integrinas
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Fator de Crescimento Transformador beta
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Regiões Determinantes de Complementaridade
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Anticorpos Monoclonais
Limite:
Animals
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Humans
Idioma:
En
Revista:
MAbs
Assunto da revista:
ALERGIA E IMUNOLOGIA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Estados Unidos