Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Generation and Activity Evaluation of a Mouse-Human Immunoglobulin G1 Chimeric Antibody to Histoplasma capsulatum HSP60

Version 1 : Received: 4 April 2021 / Approved: 5 April 2021 / Online: 5 April 2021 (11:33:24 CEST)

How to cite: Nogueira D'Áurea Moura, Á.; Garforth, S.J.; Buffoni Roque da Silva, L.; Woodley, D.; Vieira Barbalho, F.; Quiroz, J.A.; Almo, S.C.; Lai, J.R.; Nosanchuk, J.D.; Pelleschi Taborda, C. Generation and Activity Evaluation of a Mouse-Human Immunoglobulin G1 Chimeric Antibody to Histoplasma capsulatum HSP60. Preprints 2021, 2021040101 (doi: 10.20944/preprints202104.0101.v1). Nogueira D'Áurea Moura, Á.; Garforth, S.J.; Buffoni Roque da Silva, L.; Woodley, D.; Vieira Barbalho, F.; Quiroz, J.A.; Almo, S.C.; Lai, J.R.; Nosanchuk, J.D.; Pelleschi Taborda, C. Generation and Activity Evaluation of a Mouse-Human Immunoglobulin G1 Chimeric Antibody to Histoplasma capsulatum HSP60. Preprints 2021, 2021040101 (doi: 10.20944/preprints202104.0101.v1).

Abstract

Heat shock proteins (Hsps) are highly conserved molecules that are constitutively expressed and upregulated in response to physiological stress conditions. These immunogenic chaperones can have essential functions in fungi, particularly in dimorphic pathogens. Histoplasma capsulatum and Paracoccidioides species are dimorphic fungi that are the causative agents of histoplasmosis and paracoccidioidomycosis, respectively, which are systemic mycoses with significant rates of morbidity and mortality. Current treatment consists of long-term antifungal agents, and there is an urgent need for new therapeutic approaches with higher efficacy, lower toxicity, better biodistribution and improved selectivity. We engineered an immunoglobulin G1 (IgG1) isotype chimeric mouse-human monoclonal antibody, titled ch-MAb 4E12, from the parental IgG2a MAb 4E12, a monoclonal antibody to H. capsulatum Hsp60 that is protective in experimental histoplasmosis and paracoccidioidomycosis models elicited by H. capsulatum var. capsulatum and Paracoccidioides lutzii, respectively. The ch-MAb 4E12 increased phagolysosomal fusion and enhanced the yeasts uptake by PMA differentiated human THP1 macrophage cells in vitro. At low concentrations, the chimeric antibody significantly reduced the pulmonary and splenic fungal burden compared to an irrelevant antibody or no treatment. These results are the first to show that a chimeric mouse-human antibody can modify infection caused by dimorphic fungi.

Subject Areas

Mouse-Human Chimeric Antibody; Immunotherapy; Infectious diseases; Histoplasmosis; Paracoccidioidomycosis; Histoplasma capsulatum; Paracoccidioides lutzii

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