Functional opening of the fourth ventricular outlet in C57BL/6J and delayed splotch mouse embryos.

Abstract:

:To compare the functional development of the fourth ventricular outlet in the myeloschisis-Chiari malformation complex with that of a normal brain, the chronological development of the outlet in C57BL/6J non-neural-tube defect mouse embryos was examined as the first step. Then we compared the results with those of homozygotic delayed splotch (Spd) mouse embryos which had neural-tube defects (NTDs). Ferrous chloride (Prussian blue) solution was injected into the lateral or mesencephalic ventricle on gestation days 13-16 in the case of control C57BL/6J mouse embryos and on gestation days 14-16 in the case of homozygotic Spd mouse embryos which had open spinal NTDs and hindbrain anomalies comparable to human Chiari malformation. At 30 min after the injection, acid fixative was infused through the heart to set off the Prussian blue reaction, which makes the dye visible by the precipitation of ferric chloride. According to the present method, more than 75% of C57BL/6J mouse (non-NTD control) embryos showed the evidence of function of the fourth ventricular (4V) outlet from gestation day 15. It was difficult to apply the same method to Spd mouse embryos with NTDs due to the small size of ventricles. Only 4 injections were successful, of which 3 showed the functioning evidence of the 4V outlet. Though the number of mouse embryos with NTDs studied was small, the results suggest that the chronological progress of functional opening of the fourth ventricle in mouse embryos with NTDs is similar to that of control non-NTD embryos.

journal_name

Pediatr Neurosurg

journal_title

Pediatric neurosurgery

authors

Wang KC,Higbee R,Knepper PA,McLone DG

doi

10.1159/000121248

subject

Has Abstract

pub_date

1997-10-01 00:00:00

pages

176-81

issue

4

eissn

1016-2291

issn

1423-0305

journal_volume

27

pub_type

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