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B7-H3×4-1BB bispecific antibody augments antitumor immunity by enhancing terminally differentiated CD8+ tumor-infiltrating lymphocytes


Abstract
Cancer immunotherapy with 4-1BB agonists has limited further clinical development because of dose-limiting toxicity. Here, we developed a bispecific antibody (bsAb; B7-H3×4-1BB), targeting human B7-H3 (hB7-H3) and mouse or human 4-1BB, to restrict the 4-1BB stimulation in tumors. B7-H3×m4-1BB elicited a 4-1BB–dependent antitumor response in hB7-H3–overexpressing tumor models without systemic toxicity. BsAb primarily targets CD8 T cells in the tumor and increases their proliferation and cytokine production. Among the CD8 T cell population in the tumor, 4-1BB is solely expressed on PD-1 ....

United States , South Korea , Republic Of Korea , Tonbo Biosciences , Eomes Dan , Spectrostar Nano , Cytofix Cytoperm , Lab Inc , Ge Healthcare Life Sciences , Biocytogen Haimen Animal Center , Korean Cell Line Bank , Cell Signaling Technology , Treestar Inc , Precisionx Ray Inc , Donga St Co , Ge Healthcare , Ministry Of Education , Graphpad Prism Software , Biotech Center , Jiangsu Biocytogen Co , Tp Bio Co , Orient Bio Inc , Bio Inc , University Of Ulsan , Biacore Insight Evaluation Software Cytiva , Biocytogen Co ,

Early Release - Role of Burkholderia pseudomallei–Specific IgG2 in Adults with Acute Melioidosis, Thailand - Volume 27, Number 2—February 2021 - Emerging Infectious Diseases journal


Melioidosis is a life-threatening infectious disease caused by the gram-negative bacillus
Burkholderia pseudomallei. An effective vaccine is needed, but data on protective immune responses in human melioidosis are lacking. We used ELISA and an antibody-dependent cellular phagocytosis assay to identify the major features of protective antibodies in patients with acute melioidosis in Thailand. We found that high levels of
B. pseudomallei–specific IgG2 are associated with protection against death in a multivariable logistic regression analysis adjusting for age, diabetes, renal disease, and neutrophil count. Serum from melioidosis survivors enhanced bacteria uptake into human monocytes expressing FcγRIIa-H/R131, an intermediate-affinity IgG2-receptor, compared with serum from nonsurvivors. We did not find this enhancement when using monocytes carrying the low IgG2–affinity FcγRIIa-R131 allele. The findings indicate the importance of IgG2 in protection against death in ....

Krung Thep Mahanakhon , Eteläuomen Läi , Ubon Ratchathani , Miltenyi Biotec , Becton Dickinson , Graphpad Software Inc , International Conference On Harmonization Good Clinical Practice , Us Centers For Disease , Windows Statacorp , Oxford Tropical Research Ethics Committee , Roswell Park Memorial Institute , Mahidol Oxford Tropical Medicine Research Unit , Mahidol University , Disease Control , Tropical Medicine , Sunpasithiprasong Hospital , International Conference , Harmonization Good Clinical Practice , Assay Kit , Thermo Fisher Scientific , Nunc Maxisorp , Applied Biosystems , Fixation Buffer , Running Buffer , Mann Whitneyu Test , Graphpad Prism Version ,