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. 2022 Nov 3:13:961842.
doi: 10.3389/fneur.2022.961842. eCollection 2022.

The association between cerebrospinal ferritin and soluble triggering receptor expressed on myeloid cells 2 along Alzheimer's continuum

Xiaolei Shi  1   2 , Xiaomei Zhong  1   2 , Huarong Zhou  1   2 , Nan Zhou  2   3 , Yachun Hu  4 , Yuping Ning  1   2   5 ; Alzheimer's Disease Neuroimaging Initiative
Affiliations

The association between cerebrospinal ferritin and soluble triggering receptor expressed on myeloid cells 2 along Alzheimer's continuum

Xiaolei Shi et al. Front Neurol. .

Abstract

Brain iron accumulation, which is indicated in the cerebrospinal fluid (CSF) ferritin, is associated with the development of Alzheimer's Disease (AD). Studies have indicated that iron deposition might participate in Alzheimer's pathology through the induction of microglial activation. A soluble triggering receptor expressed on myeloid cells 2 (sTrem2) in CSF is increasingly recognized as a reliable indicator for microglia activity in the brain and participates in the development of neuroinflammation. However, the association between CSF ferritin and sTrem2 under the AD continuum has not been well-established. We enrolled individuals from the Alzheimer's Disease Neuroimaging Initiative (ADNI) database. Participants were classified into healthy controls (HC, n = 46) and AD continuum (n = 105) in the combined strata of Amyloid/Tau/Neurodegeneration (ATN) mode and Clinical Dementia Rating (CDR) criteria. The associations between CSF ferritin (indicating iron burden) and sTrem2, as well as AD pathology, which is reflected by Aβ42, t-tau, and p-tau in CSF, were explored. CSF ferritin was significantly associated with sTrem2 among all participants (β = 0.517, P < 0.001, FDR < 0.001), HC (β = 0.749, P = 0.006, FDR = 0.010), and AD continuum (β = 0.488, P < 0.001, FDR < 0.001), respectively. However, ferritin predicted the accelerated sTrem2 level in those with high ferritin (β = 0.549, P = 0.036, FDR = 0.045). In conclusion, CSF ferritin serves as a potential biomarker of Trem2-indicated microglia function.

Keywords: Alzheimer's Disease; ferritin; iron; neuroinflammation; sTrem2.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
The associations of CSF ferritin with sTrem2 among all participants (A), healthy controls (B), and AD continuum (C). AD, Alzheimer's Disease; CSF, cerebrospinal fluid.
Figure 2
Figure 2
The associations of CSF ferritin with sTrem2 among participants with high (A) and low (B) CSF ferritin. CSF, cerebrospinal fluid.
See this image and copyright information in PMC

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