Does the oxysterol 27-hydroxycholesterol underlie Alzheimer's disease-Parkinson's disease overlap?

Gurdeep Marwarha, Othman Ghribi

Research output: Contribution to journalReview articlepeer-review

48 Scopus citations


Alzheimer's disease (AD), the most common form of dementia, is characterized histopathologically by the deposition of β-amyloid (Aβ) plaques and neurofibrillary tangles-containing hyperphosphorylated tau protein in the brain. Parkinson's disease (PD), the most common movement disorder, is characterized by the aggregation of α-synuclein protein in Lewy body inclusions and the death of dopaminergic neurons in the substantia nigra. Based on their pathological signatures, AD and PD can be considered as two different disease entities. However, a subpopulation of PD patients also exhibit Aβ plaques, and AD patients exhibit α-synuclein aggregates. This overlap between PD and AD suggests that common pathological pathways exist for the two diseases. Identification of factors and cellular mechanisms by which these factors can trigger pathological hallmarks for AD/PD overlap may help in designing disease-modifying therapies that can reverse or stop the progression of AD and PD. For the last decade, work in our laboratory has shown that fluctuations in the levels of cholesterol oxidation products (oxysterols) may correlate with the onset of AD and PD. In this review, we will provide results from our laboratory and data from literature that converge to strongly suggest the involvement of cholesterol and cholesterol oxidation products in the pathogenesis of AD and PD. We will specifically delineate the role of and the underlying mechanisms by which increased levels of the oxysterol 27-hydroxycholesterol contribute to the pathogenesis of AD, PD, and AD/PD overlap.

Original languageEnglish (US)
Pages (from-to)13-18
Number of pages6
JournalExperimental Gerontology
StatePublished - Aug 1 2015
Externally publishedYes


  • Alpha synuclein
  • Alzheimer's disease
  • Endoplasmic reticulum stress
  • Oxysterols
  • Parkinson's disease

ASJC Scopus subject areas

  • Biochemistry
  • Aging
  • Molecular Biology
  • Genetics
  • Endocrinology
  • Cell Biology


Dive into the research topics of 'Does the oxysterol 27-hydroxycholesterol underlie Alzheimer's disease-Parkinson's disease overlap?'. Together they form a unique fingerprint.

Cite this