skip to Main Content

Abnormalities of age-related T cell senescence in Parkinson’s disease.


Maximus Peto’s Commentary

This group reports that T cells in mild Parkinson’s disease patients have “strikingly reduced markers of replicative senescence in the CD8+ population…whilst expression of activation markers (CD28) was increased”. I wonder what this might suggest about the ultimate cause of Parkinson’s.


Abnormalities of age-related T cell senescence in Parkinson’s disease.
J Neuroinflammation. 2018 May 28;15(1):166.
Williams-Gray CH, Wijeyekoon RS, Scott KM, Hayat S, Barker RA, Jones JL
DOI: 10.1186/s12974-018-1206-5
PubMed publication date (edat): 5/29/2018

Abstract

BACKGROUND:
A wealth of evidence implicates both central and peripheral immune changes as contributing to the pathogenesis of Parkinson’s disease (PD). It is critical to better understand this aspect of PD given that it is a tractable target for disease-modifying therapy. Age-related changes are known to occur in the immune system (immunosenescence) and might be of particular relevance in PD given that its prevalence rises with increasing age. We therefore sought to investigate this with respect to T cell replicative senescence, a key immune component of human ageing.

METHODS:
Peripheral blood mononuclear cells were extracted from blood samples from 41 patients with mild PD (Hoehn and Yahr stages 1-2, mean (SD) disease duration 4.3 (1.2) years) and 41 age- and gender-matched controls. Immunophenotyping was performed with flow cytometry using markers of T lymphocyte activation and senescence (CD3, CD4, CD8, HLA-DR, CD38, CD28, CCR7, CD45RA, CD57, CD31). Cytomegalovirus (CMV) serology was measured given its proposed relevance in driving T cell senescence.

RESULTS:
Markers of replicative senescence in the CD8+ population were strikingly reduced in PD cases versus controls (reduced CD57 expression (p = 0.005), reduced percentage of ‘late differentiated’ CD57loCD28hi cells (p = 0.007) and ‘TEMRA’ cells (p = 0.042)), whilst expression of activation markers (CD28) was increased (p = 0.005). This was not driven by differences in CMV seropositivity. No significant changes were observed in the CD4 population.

CONCLUSIONS:
This study demonstrates for the first time that the peripheral immune profile in PD is distinctly atypical for an older population, with a lack of the CD8+ T cell replicative senescence which characterises normal ageing. This suggests that ‘abnormal’ immune ageing may contribute to the development of PD, and markers of T cell senescence warrant further investigation as potential biomarkers in this condition.

PMID: 29807534
Free Full-Text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5972443/

Maximus Peto

Max Peto is a longevity researcher and founder of Long Life Labs. A biochemist by training, he studies the biochemistry of aging and longevity and has worked with research organizations such as SENS Research Foundation, Methuselah Foundation, BioAge Labs, Life Extension Foundation, and Ichor Therapeutics. His work at Long Life Labs is focused on empowering people to understand and manage the most critical factors for better health and longer life.

Free report on high blood pressure

The American Heart Association estimates more than 100 million Americans have high blood pressure, also known as “hypertension”. Learn more about the cause of high blood pressure and how you can reverse it in our free report.

Coming soon. We’ll send you the report as soon as it’s published.

*We do not share your email address with anyone.

Free longevity biomarker report

Biomarker levels predict the risk of early death—and we can change them! Learn about some important longevity biomarkers in our free report.

Coming soon. We’ll send you the report as soon as it’s published.

*We do not share your email address with anyone.

Free diabetes report

An estimated 50% of American adults have either prediabetes or type 2 diabetes. Learn more about the cause of type 2 diabetes, prediabetes, insulin resistance, and how to reverse them in our free report.

Coming soon. We’ll send you the report as soon as it’s published.

*We do not share your email address with anyone.

Back To Top