Important note: Information in this article was accurate in 2003. The state of the art may have changed since the publication date.
BBC News - November 10, 2003
Their laboratory tests suggest a chemical called Epigallocatechin Gallate (EGCG) protects cells.
Writing in the Journal of Allergy and Clinical Immunology, the scientists said the discovery could lead to new treatments to fight the disease.
Key chemicals
Green tea is made up of a class of chemicals called catechins, the most abundant of which is EGCG.
It is believed that EGCG is responsible for green tea's health benefits.
Previous studies have suggested it can protect against a range of diseases, including cancer and heart disease.
Dr Kuzushige Kawai and colleagues at the University of Tokyo carried out tests to see if the chemical could help beat HIV.
They found that EGCG stopped the virus from binding to CD4 molecules and human T cells.
These are vital parts of the body's immune system. Usually HIV is able to sneak inside these cells and wipe them out.
The scientists said further research is needed to see if EGCG could be used in new anti-HIV drugs.
They said simply drinking green tea would not offer people protection from the virus.
The concentration of EGCG used in the laboratory tests are many times over the blood concentration that could be achieved by just drinking green tea.
But in an accompanying editorial, Dr William Shearer from Baylor College of Medicine in Houston, Texas, welcomed the findings.
"Molecular modelling of a drug form of EGCG for HIV infection might be a further development of these investigations," he said.
Previous studies have also indicated this chemical may have a role to play in fighting HIV.
However, much further research is needed before the laboratory findings will lead to drugs for patients with HIV.
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