Photo credit: Researchers/MIT

Date: 3 September 2020

Institution: Massachusetts Institute of Technology

Study published in: Frontiers in Microbiology

Digest:  A team at SMART’s (Singapore-MIT Alliance for Research and Technology) Antimicrobial Resistance (AMR) Interdisciplinary Research Group (IRG) tested that theory by adding H2S-releasing compounds to Acinetobacter baumannii — a pathogenic bacterium that does not produce H2S on its own. They found that rather than causing antibiotic tolerance, exogenous H2S sensitized the A. baumannii to multiple antibiotic classes. It was even able to reverse acquired resistance in A. baumannii to gentamicin, a very common antibiotic used to treat several types of infections.


Exposing bacteria to hydrogen sulfide can increase antimicrobial sensitivity in bacteria that do not produce H2S.

study finds

Growing antimicrobial resistance is a major threat for the world with a projected 10 million deaths each year by 2050 if no action is taken. The World Health Organization also warns that by 2030, drug-resistant diseases could force up to 24 million people into extreme poverty and cause catastrophic damage to the world economy.

In most bacteria studied, the production of endogenous H2S has been shown to cause antibiotic tolerance, so H2S has been speculated as a universal defense mechanism in bacteria against antibiotics.

 “Until now, hydrogen sulfide was regarded as a universal bacterial defense against antibiotics,” says Wilfried Moreira, the corresponding author of the paper and principal investigator at SMART’s AMR IRG. “This is a very exciting discovery because we are the first to show that H2S can, in fact, improve sensitivity to antibiotics, and even reverse antibiotic resistance in bacteria that do not naturally produce the agent.”

While the study focused on the effects of exogenous H2S on A. baumannii, the scientists believe the results will be mimicked in all bacteria that do not naturally produce H2S.

Acinetobacter baumannii is a critically important antibiotic-resistant pathogen that poses a huge threat to human health,” says Say Yong Ng, lead author of the paper and laboratory technologist at SMART AMR. “Our research has found a way to make the deadly bacteria and others like it more sensitive to antibiotics, and can provide a breakthrough in treating many drug-resistant infections.”

The team plans to conduct further studies to validate these exciting findings in pre-clinical models of infection, as well as extending them to other bacteria that do not produce H2S.


SMART was established by MIT in partnership with the National Research Foundation of Singapore (NRF) in 2007. SMART is the first entity in the Campus for Research Excellence and Technological Enterprise (CREATE) developed by NRF. SMART serves as an intellectual and innovation hub for research interactions between MIT and Singapore. Cutting-edge research projects in areas of interest to both Singapore and MIT are undertaken at SMART. SMART currently comprises an Innovation Center and five IRGs: AMR, Critical Analytics for Manufacturing Personalized-Medicine, Disruptive and Sustainable Technologies for Agricultural Precision, Future Urban Mobility, and Low Energy Electronic Systems. SMART research is funded by the NRF under the CREATE program.

The AMR IRG is a translational research and entrepreneurship program that tackles the growing threat of antimicrobial resistance. By leveraging talent and convergent technologies across Singapore and MIT, they tackle AMR head-on by developing multiple innovative and disruptive approaches to identify, respond to, and treat drug-resistant microbial infections.

Original written by: Linda Zahka-Stockdale

Source: Massachusetts Institute of Technology

Interested in original study: read here