Peptide could potentially protect against inflammageing

New studies into the naturally occurring peptide called PEPITEM led by the University of Birmingham, has raised the possibility of its potential to dampen age-related inflammation and restore normal immune function in older adults with immune-mediated diseases such as rheumatoid arthritis, type 1 diabetes and lupus.

The role of the PEPITEM (Peptide Inhibitor of Trans-Endothelial Migration) pathway, which regulates the trafficking of immune cells between blood and body tissues at controlled levels and initially identified at the university in 2015, has already been demonstrated in immune-mediated diseases; this is the first data showing that PEPITEM has the potential to increase healthspan in an aging population.

Lead researchers Drs Myriam Chimen, Asif Iqbal, and Helen McGettrick, used an animal model to study the effect of an immune challenge in young and older mice and the extent to which PEPITEM influences leukocyte (white blood cell) trafficking in both groups.

Their findings revealed that older mice exhibited an exaggerated response in terms of the number, subtype, and migration of immune cells (including T-cells), which could be reduced by administering PEPITEM. This indicates a decline in the activity of the PEPITEM pathway with age.

The second aspect of the study examined the potential cause for this decline in PEPITEM activity with age by using B-cells harvested from younger (under 45 years) and older (over 60 years) human donors.

PEPITEM originates from a larger protein secreted by B-cells (white blood cells), and its production is triggered by a circulating hormone called adiponectin. In the bloodstream, PEPITEM acts on receptors on cells that line blood vessel walls.

The researchers found that B-cells from older adults had a deficit in the signalling pathway that triggers the production of the parent protein for PEPITEM (14-3-3ζ).

Dr Chimen said, "We have shown an age-related decline in the PEPITEM-adiponectin pathway and demonstrated the influence this has on T-cell trafficking, as seen in inflammageing. These truly exciting results raise the possibility of developing a geroprotective agent that not only reduces excessive inflammation in old age but also supports good immune function in older people."

University of Birmingham Enterprise has filed several patent families related to PEPITEM and the components of the PEPITEM molecule responsible for maintaining a normal immune response.  The team is seeking collaborative partners, licensees and / or investors.

'Rejuvenation of leukocyte trafficking in aged mice through PEPITEM intervention' is published in npjaging

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