Macrophage apolipoprotein synthesis and endoneurial distribution as a response to segmental demyelination.

Abstract:

:The synthesis and endoneurial distribution of apolipoproteins in response to myelin degradation was elucidated morphologically and biochemically in rodent models of segmental demyelination. At the onset of acute demyelination induced by tellurium (Te) poisoning, macrophages infiltrated the endoneurium and then began to express cytoplasmic immunoreactivity for apolipoprotein E (apo E). When demyelinating nerve slices were incubated with S35-methionine, radiolabeled apo E was released, showing that apo E was actively synthesized by the macrophages. Macrophages secreted apo E into the endoneurial spaces, leading to dense endoneurial accumulations. Other apolipoproteins (apo A1 and albumin) were not synthesized in the endoneurium, but they entered edematous nerves, presumably through an early breakdown in the blood-nerve barrier. During the phagocytosis of myelin, plasma-derived apolipoproteins accumulated within some of the macrophages. In chronic demyelination caused by lead poisoning, the cellular and extracellular distribution of apolipoproteins was similar to Te neuropathy; the amount of apo E accumulation and the macrophage density were proportional to the prevalence of active demyelination in teased fibers. Similar patterns of endoneurial apo E were present in an inherited form of demyelination in the twitcher mouse, after antibody-mediated demyelination, and in demyelination secondary to axonal degeneration. Human sural nerve biopsies had patterns of apolipoprotein E antigenicity that were comparable to the rodent models. We conclude that secretion of apo E by infiltrating macrophages is a generalized response to demyelination, and that endoneurial edema leads to the accumulation of certain plasma apolipoproteins within macrophages. These data suggest that endoneurial apolipoproteins and macrophages might mediate important functions in patients recovering from primary and secondary demyelination.

authors

Gelman BB,Goodrum J,Bouldin TW

doi

10.1097/00005072-199107000-00001

subject

Has Abstract

pub_date

1991-07-01 00:00:00

pages

383-407

issue

4

eissn

0022-3069

issn

1554-6578

journal_volume

50

pub_type

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