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í»Ê«ë×ú°¿¡ µû¸¥ ÊÜá¬øà MitochondriaÀÇ õ±Ú°û¡÷¾ùÊîÜ Ü¨ûù Ultrastructural Changes of Liver Cell Mitochondria in Autolysis

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Abstract

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#ÃÊ·Ï#
The authors studied the ultrastructural changes of liver cell mitochondria in autolysis.
The male Sprague-Dawley rats, weighing 140¡­160gm were sacrificed for extract liver
tissue. The slices of the liver tissue were incubated in 37¡É aseptic normal saline, and
those were examined by following intervals; 10,20 and 30 minutes and 1,2,6,12 and 24
hours with light and electron micro-scope.
The results obtained by light microscopy were summerized as follow. Several fine
intracytoplasmic vacuoles were observed 1 hour after incubation. After 3 hours, focal
destruction of cytoplasmic membrane with pyknosis of nuclei were observed. More
delicate intracytoplasmic architectural changes could not be detected at light microscopic
studies. The cord arrangement and cellular boundaries were relatively well preserved
until 24 hours after incubation.
Electronmicroscopically, mild intramitochondrial swelling with diminution of
intramatrical granules were observed at 20 minutes. These were the earliest findings.
Both high amplitude swelling and destruction of mitochondrial membrane were observed
concurrently at 1 hour after incubation. The earlier membrane changes were observed at
inner membrane with cristae and followed by degeneration of the outer membrane. The
intramatrinal amorphous dense deposits were observed at 30 minuses when the
membranes were not destroyed. These deposits were noted in the other experimental
groups which were incubated longer than 30 minutes. More electron dense deposits were
observed after 1 hour at that time the membrane changes appeared.
The results suggest in thin experiment that the earliest autolytic changes of liver cell
mitochondria is loss of intramitochondrial granules and the memtraneous changes led to
the irreversible mitochondrial injury. The appearance of two types of intramitochondrial
dense deposits would be an interesting finding needed to require further investigation for
the chemical stucture and mechanism of dense deposit formation.

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