Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 4 complete abstracts (688 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
A light-sensitive neuroendocrine organ attached to the roof of the third ventricle of the brain. The pineal gland secretes melatonin, other biogenic amines and neuropeptides.
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Gland, Pineal; Pineal Glands; Epiphysis Cerebri; Pineal Body; Pineal Bodies; Corpus Pineale.
Where it fits in the MeSH classification
- Broader topics
- Endocrine Glands; Neurosecretory Systems; Epithalamus
- See also
- Pinealectomy
Related concepts
- Third Ventricle
- Melatonin
- Biogenic Amines
- Neuropeptides
Research landscape
PubMed indexes 12,494 records tagged with the MeSH heading “Pineal Gland” (counts retrieved 2026-10-29). 679 of them (5.4%) were published from 2020 onward, and the busiest period so far is through 1999 with 8,920 records.
Reviews account for 1,359 records (10.9%) and meta-analyses for 14. Randomized controlled trials number 36 (0.3%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.
Show the data
| Period | Records |
|---|---|
| through 1999 | 8,920 |
| 2000-2009 | 1,766 |
| 2010-2019 | 1,129 |
| 2020 onward | 679 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 1,359 | 10.9% |
| Meta-analyses | 14 | 0.1% |
| Randomized controlled trials | 36 | 0.3% |
Method: PubMed query "Pineal Gland"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.
Reading the evidence in neuroscience
Neuroscience draws on tools with different strengths: cellular and animal work can manipulate circuits directly, while human imaging and electrophysiology observe the living brain at lower resolution. Small imaging studies are prone to false positives, and findings in animals do not always carry over to people. Clinical neurology and psychiatry rely on trials and cohort studies whose outcomes are often symptom scales. Check the species, the sample size, how the outcome was measured and whether results were replicated.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
Pineal Calcification, Melatonin Production, Aging, Associated Health Consequences and Rejuvenation of the Pineal Gland [1]
Abstract reading summary — source excerpts
- Opening excerpt
- The pineal gland is a unique organ that synthesizes melatonin as the signaling molecule of natural photoperiodic environment and as a potent neuronal protective antioxidant.
- Closing excerpt
- Finally, we suggest that preservation of pineal health can be achieved by retarding its premature calcification or even rejuvenating the calcified gland.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (140 words)
The pineal gland is a unique organ that synthesizes melatonin as the signaling molecule of natural photoperiodic environment and as a potent neuronal protective antioxidant. An intact and functional pineal gland is necessary for preserving optimal human health. Unfortunately, this gland has the highest calcification rate among all organs and tissues of the human body. Pineal calcification jeopardizes melatonin's synthetic capacity and is associated with a variety of neuronal diseases. In the current review, we summarized the potential mechanisms of how this process may occur under pathological conditions or during aging. We hypothesized that pineal calcification is an active process and resembles in some respects of bone formation. The mesenchymal stem cells and melatonin participate in this process. Finally, we suggest that preservation of pineal health can be achieved by retarding its premature calcification or even rejuvenating the calcified gland.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 29385085 · DOI · PMC6017004
Light exposure at night disrupts host/cancer circadian regulatory dynamics: impact on the Warburg effect, lipid signaling and tumor growth prevention [2]
Abstract reading summary — source excerpts
- Opening excerpt
- The central circadian clock within the suprachiasmatic nucleus (SCN) plays an important role in temporally organizing and coordinating many of the processes governing cancer cell proliferation and tumor growth in synchrony with the daily light/dark cycle which may contribute to endogenous cancer prevention.
- Closing excerpt
- Dim light at night (LAN)-induced melatonin suppression disrupts this circadian-regulated host/cancer balance among several important cancer preventative signaling mechanisms, leading to hyperglycemia and hyperinsulinemia in the host and runaway aerobic glycolysis, lipid signaling and proliferative activity in the tumor.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (163 words)
The central circadian clock within the suprachiasmatic nucleus (SCN) plays an important role in temporally organizing and coordinating many of the processes governing cancer cell proliferation and tumor growth in synchrony with the daily light/dark cycle which may contribute to endogenous cancer prevention. Bioenergetic substrates and molecular intermediates required for building tumor biomass each day are derived from both aerobic glycolysis (Warburg effect) and lipid metabolism. Using tissue-isolated human breast cancer xenografts grown in nude rats, we determined that circulating systemic factors in the host and the Warburg effect, linoleic acid uptake/metabolism and growth signaling activities in the tumor are dynamically regulated, coordinated and integrated within circadian time structure over a 24-hour light/dark cycle by SCN-driven nocturnal pineal production of the anticancer hormone melatonin. Dim light at night (LAN)-induced melatonin suppression disrupts this circadian-regulated host/cancer balance among several important cancer preventative signaling mechanisms, leading to hyperglycemia and hyperinsulinemia in the host and runaway aerobic glycolysis, lipid signaling and proliferative activity in the tumor.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 25099274 · DOI · PMC4123875
Pineal gland dysfunction in Alzheimer's disease: relationship with the immune-pineal axis, sleep disturbance, and neurogenesis [3]
Abstract reading summary — source excerpts
- Opening excerpt
- Alzheimer's disease (AD) is a globally common neurodegenerative disease, which is accompanied by alterations to various lifestyle patterns, such as sleep disturbance.
- Closing excerpt
- I suggest new insights to understanding the relationship between AD pathogenesis and pineal gland function.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (143 words)
Alzheimer's disease (AD) is a globally common neurodegenerative disease, which is accompanied by alterations to various lifestyle patterns, such as sleep disturbance. The pineal gland is the primary endocrine organ that secretes hormones, such as melatonin, and controls the circadian rhythms. The decrease in pineal gland volume and pineal calcification leads to the reduction of melatonin production. Melatonin has been reported to have multiple roles in the central nervous system (CNS), including improving neurogenesis and synaptic plasticity, suppressing neuroinflammation, enhancing memory function, and protecting against oxidative stress. Recently, reduced pineal gland volume and pineal calcification, accompanied by cognitive decline and sleep disturbances have been observed in AD patients. Here, I review current significant evidence of the contribution of pineal dysfunction in AD to the progress of AD neuropathology. I suggest new insights to understanding the relationship between AD pathogenesis and pineal gland function.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 31296240 · DOI · PMC6624939
Automated measurement of pineal gland calcification volumes and sleep quality in adults living in costal Ecuador [4]
Abstract reading summary — source excerpts
- Opening excerpt
- Studies on the association between pineal gland calcification (PGC) and non-breathing sleep-related symptoms are inconclusive.
- Closing excerpt
- Study results did not find an association between increased PGC and sleep quality after adjusting for demographics, suggesting that PGC may not necessarily indicate pineal dysfunction but could reflect adaptive physiological mechanisms.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (242 words)
Studies on the association between pineal gland calcification (PGC) and non-breathing sleep-related symptoms are inconclusive.The present study aims to evaluate this association in middle-aged and older adults living in rural villages located in coastal Ecuador.Community-dwellers aged ≥ 40 years enrolled in the Three Villages Study cohort were interviewed with the Pittsburgh Sleep Quality Index (PSQI) to assess sleep quality and received head computed tomography for automated measurement of PGC volumes. Generalized linear and logistic regression models were used to assess the association between PGC volumes (exposure) and the PSQI score and sleep quality (as separate dependent variables), after adjusting for age and sex.The study included 1,009 participants (mean age: 56.5 ± 12.6 years; 57% women). The mean volume of PGC was 51 ± 53.5 µL. The mean score of the PSQI was 5.3 ± 2.8 points, with 399 (40%) participants having poor sleep quality. Locally-Weighted Scatterplot Smoothing showed a linear relationship between continuous PGC volumes and PSQI scores. An unadjusted generalized linear regression model showed a significant association between PGC volumes stratified in tertiles and the continuous PSQI score. However, this association lost statistical significance after adjustment for age and sex. The association between tertiles of PGC and poor sleep quality was non-significant in both unadjusted and multivariate logistic regression models.Study results did not find an association between increased PGC and sleep quality after adjusting for demographics, suggesting that PGC may not necessarily indicate pineal dysfunction but could reflect adaptive physiological mechanisms.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41581501 · DOI · PMC12832156
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article Melatonin--a pleiotropic, orchestrating regulator molecule [5]
- Research article Melatonin: a multitasking molecule [6]
- Research article Arylalkylamine N-acetyltransferase: "the Timezyme" [7]
- Research article The human pineal gland and melatonin in aging and Alzheimer's disease [8]
- Research article Neural control of the pineal gland [9]
- Research article Cellular circadian clocks in the pineal [10]
References
- Tan DX, Xu B, Zhou X, Reiter RJ. Pineal Calcification, Melatonin Production, Aging, Associated Health Consequences and Rejuvenation of the Pineal Gland. . 2018. PMID 29385085 · DOI · PMC6017004
- Blask DE, Dauchy RT, Dauchy EM, Mao L, Hill SM, Greene MW, et al.. Light exposure at night disrupts host/cancer circadian regulatory dynamics: impact on the Warburg effect, lipid signaling and tumor growth prevention. . 2014. PMID 25099274 · DOI · PMC4123875
- Song J. Pineal gland dysfunction in Alzheimer's disease: relationship with the immune-pineal axis, sleep disturbance, and neurogenesis. . 2019. PMID 31296240 · DOI · PMC6624939
- Del Brutto OH, Mera RM, Arias EE, Rumbea DA, Patel V, Castillo PR. Automated measurement of pineal gland calcification volumes and sleep quality in adults living in costal Ecuador. . 2026. PMID 41581501 · DOI · PMC12832156
- Hardeland R, Cardinali DP, Srinivasan V, Spence DW, Brown GM, Pandi-Perumal SR. Melatonin--a pleiotropic, orchestrating regulator molecule. Prog Neurobiol. 2011. PMID 21193011 · DOI
- Reiter RJ, Tan DX, Fuentes-Broto L. Melatonin: a multitasking molecule. Prog Brain Res. 2010. PMID 20478436 · DOI
- Klein DC. Arylalkylamine N-acetyltransferase: "the Timezyme". J Biol Chem. 2007. PMID 17164235 · DOI
- Wu YH, Swaab DF. The human pineal gland and melatonin in aging and Alzheimer's disease. J Pineal Res. 2005. PMID 15725334 · DOI
- Moore RY. Neural control of the pineal gland. Behav Brain Res. 1996. PMID 8788489 · DOI
- Falcón J. Cellular circadian clocks in the pineal. Prog Neurobiol. 1999. PMID 10338357 · DOI
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-29.
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Evidence strength
EvidenceHelix's computed view of the study designs behind this topic: how common meta-analyses, randomized trials and reviews are, how recent the literature is, and a plain-language reading. It describes the design mix of the literature. It is not a quality appraisal of any study, and it is not medical advice.