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An Allosteric Anti-tryptase Antibody for the Treatment of Mast Cell-Mediated Severe Asthma.


ABSTRACT: Severe asthma patients with low type 2 inflammation derive less clinical benefit from therapies targeting type 2 cytokines and represent an unmet need. We show that mast cell tryptase is elevated in severe asthma patients independent of type 2 biomarker status. Active β-tryptase allele count correlates with blood tryptase levels, and asthma patients carrying more active alleles benefit less from anti-IgE treatment. We generated a noncompetitive inhibitory antibody against human β-tryptase, which dissociates active tetramers into inactive monomers. A 2.15 Å crystal structure of a β-tryptase/antibody complex coupled with biochemical studies reveal the molecular basis for allosteric destabilization of small and large interfaces required for tetramerization. This anti-tryptase antibody potently blocks tryptase enzymatic activity in a humanized mouse model, reducing IgE-mediated systemic anaphylaxis, and inhibits airway tryptase in Ascaris-sensitized cynomolgus monkeys with favorable pharmacokinetics. These data provide a foundation for developing anti-tryptase as a clinical therapy for severe asthma.

SUBMITTER: Maun HR 

PROVIDER: S-EPMC8403554 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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An Allosteric Anti-tryptase Antibody for the Treatment of Mast Cell-Mediated Severe Asthma.

Maun Henry R HR   Jackman Janet K JK   Choy David F DF   Loyet Kelly M KM   Staton Tracy L TL   Jia Guiquan G   Dressen Amy A   Hackney Jason A JA   Bremer Meire M   Walters Benjamin T BT   Vij Rajesh R   Chen Xiaocheng X   Trivedi Neil N NN   Morando Ashley A   Lipari Michael T MT   Franke Yvonne Y   Wu Xiumin X   Zhang Juan J   Liu John J   Wu Ping P   Chang Diana D   Orozco Luz D LD   Christensen Erin E   Wong Manda M   Corpuz Racquel R   Hang Julie Q JQ   Lutman Jeff J   Sukumaran Siddharth S   Wu Yan Y   Ubhayakar Savita S   Liang Xiaorong X   Schwartz Lawrence B LB   Babina Magda M   Woodruff Prescott G PG   Fahy John V JV   Ahuja Rahul R   Caughey George H GH   Kusi Aija A   Dennis Mark S MS   Eigenbrot Charles C   Kirchhofer Daniel D   Austin Cary D CD   Wu Lawren C LC   Koerber James T JT   Lee Wyne P WP   Yaspan Brian L BL   Alatsis Kathila R KR   Arron Joseph R JR   Lazarus Robert A RA   Yi Tangsheng T  

Cell 20191001 2


Severe asthma patients with low type 2 inflammation derive less clinical benefit from therapies targeting type 2 cytokines and represent an unmet need. We show that mast cell tryptase is elevated in severe asthma patients independent of type 2 biomarker status. Active β-tryptase allele count correlates with blood tryptase levels, and asthma patients carrying more active alleles benefit less from anti-IgE treatment. We generated a noncompetitive inhibitory antibody against human β-tryptase, which  ...[more]

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