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2017 ; 134
(4
): 567-583
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Persistent microglial activation and synaptic loss with behavioral abnormalities
in mouse offspring exposed to CASPR2-antibodies in utero
#MMPMID28755208
Coutinho E
; Menassa DA
; Jacobson L
; West SJ
; Domingos J
; Moloney TC
; Lang B
; Harrison PJ
; Bennett DLH
; Bannerman D
; Vincent A
Acta Neuropathol
2017[Oct]; 134
(4
): 567-583
PMID28755208
show ga
Gestational transfer of maternal antibodies against fetal neuronal proteins may
be relevant to some neurodevelopmental disorders, but until recently there were
no proteins identified. We recently reported a fivefold increase in
CASPR2-antibodies in mid-gestation sera from mothers of children with
intellectual and motor disabilities. Here, we exposed mice in utero to purified
IgG from patients with CASPR2-antibodies (CASPR2-IgGs) or from healthy controls
(HC-IgGs). CASPR2-IgG but not HC-IgG bound to fetal brain parenchyma, from which
CASPR2-antibodies could be eluted. CASPR2-IgG exposed neonates achieved
milestones similarly to HC-IgG exposed controls but, when adult, the CASPR2-IgG
exposed progeny showed marked social interaction deficits, abnormally located
glutamatergic neurons in layers V-VI of the somatosensory cortex, a 16% increase
in activated microglia, and a 15-52% decrease in glutamatergic synapses in layers
of the prefrontal and somatosensory cortices. Thus, in utero exposure to
CASPR2-antibodies led to permanent behavioral, cellular, and synaptic
abnormalities. These findings support a pathogenic role for maternal antibodies
in human neurodevelopmental conditions, and CASPR2 as a potential target.