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2015 ; 12
(ä): 205
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Neuropsychiatric systemic lupus erythematosus persists despite attenuation of
systemic disease in MRL/lpr mice
#MMPMID26546449
Stock AD
; Wen J
; Doerner J
; Herlitz LC
; Gulinello M
; Putterman C
J Neuroinflammation
2015[Nov]; 12
(ä): 205
PMID26546449
show ga
BACKGROUND: Systemic lupus erythematosus (SLE) is a prototypical autoimmune
disease marked by both B and T cell hyperactivity which commonly affects the
joints, skin, kidneys, and brain. Neuropsychiatric disease affects about 40 % of
SLE patients, most frequently manifesting as depression, memory deficits, and
general cognitive decline. One important and yet unresolved question is whether
neuropsychiatric SLE (NPSLE) is a complication of systemic autoimmunity or
whether it is primarily driven by brain-intrinsic factors. METHODS: To dissect
the relative contributions of the central nervous system from those of the
hematopoietic compartment, we generated bone marrow chimeras between healthy
control (MRL/+) and lupus-prone MRL/Tnfrsf6 (lpr/lpr) mice (MRL/+???MRL/lpr), as
well as control chimeras. After bone marrow reconstitution, mice underwent
extensive behavioral testing, analysis of brain tissue, and histological
assessment. RESULTS: Despite transfer of healthy MRL/+ bone marrow and marked
attenuation of systemic disease, we found that MRL/+???MRL/lpr mice had a
behavioral phenotype consisting of depressive-like behavior and visuospatial
memory deficits, comparable to MRL/lpr???MRL/lpr control transplanted mice and
the behavioral profile previously established in MRL/lpr mice. Moreover,
MRL/+???MRL/lpr chimeric mice displayed increased brain RANTES expression,
neurodegeneration, and cellular infiltration in the choroid plexus, as well as
blood brain barrier disruption, all in the absence of significant systemic
autoimmunity. CONCLUSIONS: Chimeric MRL/+???MRL/lpr mice displayed no attenuation
of the behavioral phenotype found in MRL/lpr mice, despite normalized serum
autoantibodies and conserved renal function. Therefore, neuropsychiatric disease
in the MRL/lpr lupus-prone strain of mice can occur absent any major
contributions from systemic autoimmunity.