Cholesterol esterifying enzyme in normal and degenerating peripheral nerve.

Abstract:

:The cholesterol esterifying enzyme which incorporates exogenous free [1-14C]oleate into cholesteryl ester is present in rat sciatic endoneurium. Cholesterol esterification is optimal at pH 4.8. Exogenous ATP, CoA, and oleyl-CoA do not greatly affect its activity. Various detergents and bile salts are inhibitory. Enzyme activity does not change appreciably during storage at 4 degrees C for up to 4 days or at -70 degrees C for up to 1 month. Of the subcellular fractions, the microsomal fraction exhibits the highest specific activity. Over 75% of enzyme activity is recovered, with equal amounts in the microsomal and soluble fractions. During nerve fiber degeneration an increase (more than fivefold) in cholesterol esterifying activity, which peaks 6 days after crush, is observed. Elevated levels of enzyme activity persist for 90 days after crush, by which time nerve regeneration is well established. Thus, it is concluded that an increase in cholesterol esterifying activity in degenerating nerve is primarily responsible for cholesterol esterification during Wallerian degeneration. The maximum increase in cholesterol esterifying activity is associated temporally with axonal degeneration and, particularly, with the formation of myelin ovoids.

journal_name

J Neurochem

authors

Yao JK,Dyck PJ

doi

10.1111/j.1471-4159.1981.tb05303.x

subject

Has Abstract

pub_date

1981-07-01 00:00:00

pages

156-63

issue

1

eissn

0022-3042

issn

1471-4159

journal_volume

37

pub_type

杂志文章