Broadly neutralizing antibodies could provide immunity against SARS-CoV-2 variants

Two broadly neutralizing antibodies show great promise to provide long-acting immunity against COVID-19 in immunocompromised populations according to a paper published June 15 in the Journal of Experimental Medicine (JEM). The antibodies were effective against all SARS-CoV-2 variants of concern tested and could be used alone or in an antibody cocktail to diminish the risk of infection.

Researchers from the Institut Pasteur, Université Paris Cité, and INSERM examined 102 SARS-CoV-2 spike monoclonal antibodies cloned from the B cells of 10 COVID-19 convalescents. They found that the antibodies Cv2.1169 and Cv2.3194 were the only ones to neutralize all SARS-CoV-2 variants, including Omicron BA.1 and BA.2 subtypes. The two antibodies also were fully active against Alpha, Beta, Gamma, and Delta variants. A modified version of the Cv2.1169 antibody was also effective at treating SARS-CoV-2 infection in mice and hamsters.

"The broadly neutralizing antibodies we described were more efficient in vitro than many anti–SARS-CoV-2 monoclonals previously approved by the FDA for treatment or prevention. Therefore, we are pretty confident that they represent premium candidates for pre-exposure prophylaxis in immunocompromised patients," says Hugo Mouquet, head of the Laboratory of Humoral Immunology at the Institut Pasteur, who led the study.

Previous research has shown that SARS-CoV-2 spike-specific monoclonal antibodies play a key role in providing in vivo protection and have been used in developing COVID-19 vaccines. However, immunocompromised individuals still lack effective immunity against SARS-CoV-2 infection.

"A key point is that those monoclonals have been engineered for extending their half-lives and therefore have an expected prolonged effect in people but would still require regular injections, possibly every few months, to maintain protective antibody titers," Mouquet says. The first molecule being developed based on the new research, SPK001, is being studied by the biotech company SpikImm, and clinical trials are expected to start in the middle of this year.

The research has its roots in a task force launched by the Institut Pasteur in the early days of the COVID-19 pandemic. The Mouquet lab focused its efforts on immunotherapeutics because of its ongoing study of human antiviral monoclonal antibodies, including molecules of prophylactic and/or therapeutic potential against HBV and HIV-1.

Notably, one of the two broadly neutralizing antibodies, Cv2.1169, is a type of antibody known as immunoglobulin A that is produced by B cells in the body’s mucosal tissues, such as the respiratory tract, and can be crucial in the early response to respiratory pathogens like SARS-CoV-2.

"One aspect of our work highlights the role of IgA antibodies for a broad SARS-CoV-2 neutralization. When studying immune responses against pathogens affecting mucosal tissues, we thus consider that IgA-mediated antibody response should be systematically investigated, including in the quest of isolating broadly neutralizing monoclonal antibodies," Mouquet says.

Planchais C, Fernández I, Bruel T, de Melo GD, Prot M, Beretta M, Guardado-Calvo P, Dufloo J, Molinos-Albert LM, Backovic M, Chiaravalli J, Giraud E, Vesin B, Conquet L, Grzelak L, Planas D, Staropoli I, Guivel-Benhassine F, Hieu T, Boullé M, Cervantes-Gonzalez M, Ungeheuer MN, Charneau P, van der Werf S, Agou F; French COVID Cohort Study Group; CORSER Study Group, Dimitrov JD, Simon-Lorière E, Bourhy H, Montagutelli X, Rey FA, Schwartz O, Mouquet H.
Potent human broadly SARS-CoV-2-neutralizing IgA and IgG antibodies effective against Omicron BA.1 and BA.2.
J Exp Med. 2022 Jul 4;219(7):e20220638. doi: 10.1084/jem.20220638

Most Popular Now

Positive Phase 1 data from mRNA-based individualiz…

BioNTech SE (Nasdaq: BNTX, "BioNTech") announced initial data from an ongoing investigator-initiated first-in-human Phase 1 study evaluating the safety and tolerability o...

FDA approves RIABNI™ (rituximab-arrx), a biosimila…

Amgen (NASDAQ:AMGN) today announced that the U.S. Food and Drug Administration (FDA) has approved RIABNI™ (rituximab-arrx), a biosimilar to Rituxan®, in combination with ...

Pfizer to invest $120 million to produce COVID-19 …

Pfizer Inc. (NYSE: PFE) announced today that it will further strengthen its commitment to United States manufacturing with a $120 million investment at its Kalamazoo, Mic...

Proteomic study of 2,002 tumors identifies 11 pan-…

A new study that analyzed protein levels in 2,002 primary tumors from 14 tissue-based cancer types identified 11 distinct molecular subtypes, providing systematic knowled...

A new technology offers treatment for HIV infectio…

A new study from Tel Aviv University offers a new and unique treatment for AIDS which may be developed into a vaccine or a one time treatment for patients with HIV. The s...

Sanoff offers perspective on a promising rectal ca…

UNC Lineberger Comprehensive Cancer Center's Hanna K. Sanoff, MD, MPH, is the author of a viewpoint in the New England Journal of Medicine that provides a perspective on ...

Broadly neutralizing antibodies could provide immu…

Two broadly neutralizing antibodies show great promise to provide long-acting immunity against COVID-19 in immunocompromised populations according to a paper published Ju...

Boehringer Ingelheim signs option to acquire Truti…

Boehringer Ingelheim announced the signing of an option to acquire Trutino Biosciences Inc. (the "Transaction"), a San Diego-based biotech company. Trutino Biosciences...

Novel drug combo activates natural killer cell imm…

Most skin cancer drugs that activate the immune system work by triggering immune cells, called T cells, to attack tumors, but when T cells are activated for too long, the...

Novartis announces Nature Medicine publication of …

Novartis announced that Nature Medicine published final results from both the two- and three-copy cohorts of the completed Phase 3 SPR1NT trial as separate companion manu...

COVID-19 rebound after taking Paxlovid likely due …

Paxlovid is the leading oral medication for preventing severe cases of COVID-19 in high-risk individuals. However, symptoms returned in some patients after treatment was ...

Biomarkers found that could be drug targets agains…

Biomarkers that could be targets for novel drugs to treat glioblastoma brain tumors have been identified by investigators at Georgetown Lombardi Comprehensive Cancer Cent...