Abstract
The antiphospholipid syndrome (APS) is an autoimmune disease characterized by the presence of antiphospholipid antibodies, which may trigger vascular thrombosis with consecutive infarcts. However, cognitive dysfunctions representing one of the most commonest neuropsychiatric symptoms are frequently present despite the absence of any ischemic brain lesions. Data on the structural and functional basis of the neuropsychiatric symptoms are sparse. To examine the effect of APS on hippocampal neurogenesis and on white matter, we induced experimental APS (eAPS) in adult female Balb/C mice by immunization with β2-glycoprotein 1. To investigate cell proliferation in the dentate gyrus granular cell layer (DG GCL), eAPS and control mice (n = 5, each) were injected with 5-bromo-2′-deoxyuridine (BrdU) once a day for 10 subsequent days. Sixteen weeks after immunization, eAPS resulted in a significant reduction of BrdU-positive cells in the DG GCL compared to control animals. However, double staining with doublecortin and NeuN revealed a largely preserved neurogenesis. Ultrastructural analysis of corpus callosum (CC) axons in eAPS (n = 6) and control mice (n = 7) revealed no significant changes in CC axon diameter or g-ratio. In conclusion, decreased cellular proliferation in the hippocampus of eAPS mice indicates a limited regenerative potential and may represent one neuropathological substrate of cognitive changes in APS while evidence for alterations of white matter integrity is lacking.
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Abbreviations
- aCL:
-
Anti-cardiolipin antibodies
- aPL:
-
Antiphospholipid antibodies
- APS:
-
Antiphospholipid syndrome
- BBB:
-
Blood–brain barrier
- BrdU:
-
5-Bromo-2′-deoxyuridine
- BSA:
-
Bovine serum albumin
- CA:
-
Cornu ammonis
- CNS:
-
Central nervous system
- CC:
-
Corpus callosum
- CFA:
-
Complete Freund’s adjuvant
- DCX:
-
Doublecortin
- DG GCL:
-
Dentate gyrus granular cell layer
- EAE:
-
Experimental autoimmune encephalomyelitis
- eAPS:
-
Experimental antiphospholipid syndrome
- LPS:
-
Lipopolysaccharide
- NGS:
-
Normal goat serum
- OD:
-
Optical density
- PBS:
-
Phosphate buffered saline
- PFA:
-
Paraformaldehyde
- RT:
-
Room temperature
- SEM:
-
Standard error of mean
- SLE:
-
Systemic lupus erythematosus
- SSC:
-
Saline-sodium citrate
- TBS:
-
Tris-buffered saline
- TBS-T:
-
TBS with Triton X-100
- WM:
-
White matter
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Acknowledgements
The technical expertise of Magdeleine Herkt and Nicole Roder is kindly acknowledged. The authors are grateful to Professor Elisabeth Jane Rushing (University Hospital Zurich, Switzerland) for critically reading the manuscript.
Funding
The present work was supported by grants from the MAIFOR program (intramural funding, Medical Center of the Johannes Gutenberg University Mainz, Germany) from the Chief Scientist in the Israel Ministry of Health and from Israel Science Foundation. Katrin Frauenknecht is the recipient of a Career Development Award by the Stavros Niarchos Foundation (https://www.snf.org/22474).
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Experimental design: KF, AK, CJS; animal experiments: AK, RW; histology/volumetry/morphometric studies: KF, PL, HDP; figures: KF, PL, HDP; manuscript KF, PL, JC, CJS. All authors read and approved the final manuscript. The authors declare no competing interests.
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Animal experiments have been approved Israeli Health Ministry (Ethical approval no. 775/12) and by the Chaim Sheba Medical Center Animal Welfare Committee. All experiments were in accordance with national and international guidelines and regulations. This article does not contain any studies with human participants performed by any of the authors.
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Frauenknecht, K., Leukel, P., Weiss, R. et al. Decreased hippocampal cell proliferation in mice with experimental antiphospholipid syndrome. Brain Struct Funct 223, 3463–3471 (2018). https://doi.org/10.1007/s00429-018-1699-9
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DOI: https://doi.org/10.1007/s00429-018-1699-9