Journal of Neurology, Neurosurgery & Psychiatry | VOL. 159

CSF ferritin in the clinicopathological progression of Alzheimer\u2019s disease and associations with APOE and inflammation biomarkers

Publication Date Nov 10, 2022


BackgroundA putative role for iron in driving Alzheimer’s disease (AD) progression is complicated by previously reported associations with neuroinflammation, apolipoprotein E and AD proteinopathy. To establish how iron interacts with clinicopathological features of AD and at what disease stage iron influences cognitive outcomes, we investigated the association of cerebrospinal fluid (CSF) biomarkers of iron (ferritin), inflammation (acute phase response proteins) and apolipoproteins with pathological biomarkers (CSF Aβ42/t-tau, p-tau181), clinical staging and longitudinal cognitive deterioration in subjects from the BioFINDER cohort, with replication of key results in the Alzheimer’s Disease Neuroimaging Initiative (ADNI) cohort.MethodsFerritin, acute phase response proteins (n=9) and apolipoproteins (n=6) were measured in CSF samples from BioFINDER (n=1239; 4 years cognitive follow-up) participants stratified by cognitive status (cognitively unimpaired, mild cognitive impairment, AD) and for the presence of amyloid and tangle pathology using CSF Aβ42/t-tau (A+) and p-tau181 (T+). The ferritin and apolipoprotein E associations were replicated in the ADNI (n=264) cohort.ResultsIn both cohorts, ferritin and apoE were elevated in A-T+ and A+T+ subjects (16%–40%), but not clinical diagnosis. Other apolipoproteins and acute phase response proteins increased with clinical diagnosis, not pathology. CSF ferritin was positively associated with p-tau181, which was mediated by apolipoprotein E. An optimised threshold of ferritin predic...


Cerebrospinal Fluid Ferritin Acute Phase Response Proteins Alzheimer’s Disease Neuroimaging Initiative Cerebrospinal Fluid Mild Cognitive Impairment Subjects Alzheimer’s Disease BioFINDER Cohort Mild Cognitive Impairment Clinical Diagnosis Distinct Associations

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