Spontaneous spongy degeneration of the brain stem in SAM-P/8 mice, a newly developed memory-deficient strain.

Abstract:

:A spontaneous spongy degeneration of the brain stem and spinal cord was discovered in a murine model of accelerated senescence (SAM), cared for under both conventional (SAM-P/8) and specific pathogen-free (SAM-P/8/Ta) conditions. SAM-P/8 and SAM-P/8/Ta showed no clinical neurological abnormalities, yet there was a deterioration in learning and memory abilities. Light microscopic examination revealed a spongy degeneration in the brain stem and spinal cord, in the reticular formation, and proliferation of hypertrophic astrocytes in the spongy area. The spongiform degeneration progressed with advancing age from four to eight months, after which the entire brain was involved. Astrocytosis increased with advancing degeneration. Ultrastructurally, mild dendritic swelling occurred at one month of age. At two months of age, moderate postsynaptic swelling and a widening of intracellular membrane structure were observed, and at age five months there were large vacuoles circumscribed by membranous lamellae, identifiable as myelin. Vacuoles in SAM-P/8 proved to be swollen neuronal processes and oligodendroglial processes. These SAM-P/8 and SAM-P/8/Ta strains of mice are new memory-deficient strains with spontaneous spongy degeneration associated with aging.

authors

Yagi H,Irino M,Matsushita T,Katoh S,Umezawa M,Tsuboyama T,Hosokawa M,Akiguchi I,Tokunaga R,Takeda T

doi

10.1097/00005072-198909000-00008

subject

Has Abstract

pub_date

1989-09-01 00:00:00

pages

577-90

issue

5

eissn

0022-3069

issn

1554-6578

journal_volume

48

pub_type

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