Researchers at Texas A&M University report that several compounds found in brewed coffee can bind to and influence NR4A1, a nuclear receptor involved in how cells respond to stress and tissue damage. The work, published in the journal Nutrients, found that the protective effects seen in lab models disappeared when NR4A1 was removed.
Researchers from the Texas A&M College of Veterinary Medicine and Biomedical Sciences (VMBS) reported evidence that multiple naturally occurring coffee compounds can bind to the orphan nuclear receptor NR4A1 (also known as Nur77) and alter its activity.
NR4A1 belongs to a family of nuclear receptors that help regulate gene activity when the body is exposed to stress or tissue injury, according to the Texas A&M summary of the work.
Dr. Stephen Safe, a distinguished professor and Sid Kyle Endowed Chair in Veterinary Toxicology at VMBS, said NR4A1 can play a protective role in damaged tissue.
"If you take that receptor away, the damage is worse," Safe said.
In the laboratory models described by the university, the researchers found that polyhydroxy and polyphenolic compounds—including caffeic acid—were among the most active in their interactions with NR4A1. The team also reported that when NR4A1 was removed from cells, the protective effects attributed to these coffee components were no longer observed.
The work also suggested that caffeine was not a strong driver of the NR4A1-related effects in the study’s models. As Safe put it:
"Caffeine binds the receptor, but it doesn't do much in our models. The polyhydroxy and polyphenolic compounds are much more active."
The researchers cautioned that the findings help clarify a potential mechanism but do not demonstrate cause and effect in people or prove that drinking coffee prevents disease.
"There's still a lot of work to be done," Safe said, adding that the team aims to better understand how important this pathway may be amid coffee’s many chemical components and possible biological effects.
