Could green tea reduce resistance to antibiotics?

Green is already known for its antioxidant properties but did you know that it can prove beneficial in getting rid of antibiotic-resistant bacteria.

Yes! Researchers have discovered that a natural antioxidant commonly found in green tea can help eliminate antibiotic-resistant bacteria.

The findings were published in the Journal of Medical Microbiology in which the researchers found that epigallocatechin (EGCG) can restore the activity of aztreonam, an antibiotic commonly used to treat infections caused by the bacterial pathogen -- Pseudomonas aeruginosa.

P. aeruginosa is associated with serious respiratory tract and bloodstream infections and has become resistant to many major classes of antibiotics over the years.

Currently, a combination of antibiotics is used to fight P. aeruginosa. However, these infections are becoming increasingly difficult to treat, as resistance to last-line antibiotics is being observed.
To assess the synergy of EGCG and aztreonam, researchers conducted in vitro tests to analyse how they interacted with the bacterial pathogen individually and in combination.

The team found that the combination of aztreonam and EGCG was significantly more effective at reducing P. aeruginosa numbers than either agent alone.

This synergistic activity was also confirmed in vivo using Galleria mellonella (Greater Wax Moth larvae), with survival rates being significantly higher in those treated with the combination than those treated with EGCG or aztreonam alone. Furthermore, minimal to no toxicity was observed in human skin cells and in Galleria mellonella larvae.

Researchers believe that in P. aeruginosa, EGCG may facilitate increased uptake of aztreonam by increasing permeability in the bacteria. Another potential mechanism is EGCG's interference with a biochemical pathway linked to antibiotic susceptibility.

"Antimicrobial resistance (AMR) is a serious threat to global public health. Without effective antibiotics, the success of medical treatments will be compromised. Natural products such as EGCG, used in combination with currently licenced antibiotics, maybe a way of improving their effectiveness and clinically useful lifespan," said lead author .

"The World Health Organisation has listed antibiotic-resistant Pseudomonas aeruginosa as a critical threat to human health. We have shown that we can successfully eliminate such threats with the use of natural products, in combination with antibiotics already in use," said the Professor.

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