The pineal gland in ageing and alzheimer's disease: age-related molecular changes.
Level 4 - case-series / case-control
Post-mortem human case-control and cross-sectional tissue study
PubMed 41563514 · doi:10.1007/s00429-026-03072-1
What was done
Histopathological analyses were conducted on 54 post-mortem human pineal gland specimens. A cross-sectional cohort of 47 specimens was categorized across five age brackets (0–20, 21–40, 41–60, 61–80, and 81–100 years). In addition, 7 cases with confirmed Alzheimer's disease (AD) neuropathology were compared against 7 matched controls. Specimens were assessed for calcification, cell loss, phosphorylated Tau (P-Tau), amyloid-beta (Aβ), glial fibrillary acidic protein (GFAP), lipofuscin, and connective tissue, alongside cerebrospinal fluid (CSF) melatonin quantification.
What was found
Pineal calcification began as early as age 3 and progressively accumulated with age alongside cellular loss. Sexual dimorphism was observed: females showed predominant lipofuscin deposition and pineal cysts, while males showed higher GFAP immunoreactivity and connective tissue expression. P-Tau and Aβ were detected in the pineal gland. Aβ deposition correlated positively with age and was markedly elevated in AD cases. AD specimens also showed marked cellular depletion, elevated GFAP expression, and significantly reduced CSF melatonin relative to controls. The abstract provided no specific numerical values, effect sizes, or p-values.
Why it matters
This study demonstrates that core AD pathological proteins (Aβ and P-Tau) accumulate directly within the human pineal gland, accompanying cellular loss and reduced CSF melatonin, offering structural evidence for pineal degeneration in aging and AD.
Limits
The sample size is small, particularly for the AD comparison (7 cases vs. 7 controls). The cross-sectional post-mortem design precludes establishing temporal causality. The abstract does not report numerical data, variance, effect sizes, or post-mortem variables such as post-mortem interval and cause of death.
Cited by
- supports Melatonin production in the pineal gland declines with age, starting around 40 years old.