Summary
An electron microscopical study of two consecutive nerve biopsies from a patient with metachromatic leucodystrophy (sulphatide lipidosis) was made. The ultrastructural changes observed consisted of: a) irregular whorls of myelin. The myelin in the whorls showed a thickened, sometimes doubled, intraperiod line, which was barely visible in compact myelin; b) “inclusion bodies” up to 1 μ in diameter in the cytoplasm of Schwann cells. These had a lamellar structure, with stacked membranes 60 Å apart; c) a “loose” pattern of the myelin in some nerve fibers, with loss of the intraperiod line, and d) presence of abnormally dense mitochondria with thickened cristae in Schwann cells. It is suggested that: a) the whorl formation and the ultrastructural abnormalities of the myelin in the whorls may be due to impaired myelin synthesis, and b) that the “inclusion bodies” may represent the accumulation of cerebroside sulfate in micellar aggregates. The “loose” pattern of myelin is considered artifactural until proven otherwise.
Zusammenfassung
Zwei aufeinanderfolgende Nervenbiopsien bei einem Patienten mit metachromatischer Leukodystrophie (Sulfatid-Lipoidose) wurden elektronenoptisch untersucht. Die beobachteten ultrastrukturellen Veränderungen bestehen in: a) unregelmäßigen Wirbelbildungen (whorls), in welchen das Myelin Verdickungen, manchmal Verdopplung des Zwischenstreifens (intraperiod line) aufweist, was im kompakten Myelin kaum sichtbar ist. b) “Einschlußkörperchen” mit einem Durchmesser bis zu1 μ im Cytoplasma der Schwann-Zellen. Diese weisen lamelläre Struktur mit einem Membranabstand von 60 Å auf. c) ein “lockeres” (loose) Myelinmuster mit Verlust des Zwischenstreifens in einigen Nervenfasern und d) Auftreten von abnorm dichten Mitochondrien mit verdicktem Cristae in Schwann-Zellen. Es wird angenommen, daß a) die Wirbelbildungen und die ultrastrukturellen Myelinabnormitäten in den Wirbeln einer gestörten Myelinsynthese entsprechen und b) daß die “Einschlußkörperchen” die Anhäufung von Cerebrosidsulfat in micellaren Verbänden darstellen. Das “lockere” Myelinmuster wird vorläufig als artifiziell angesehen.
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This investigation was supported in part by Public Health Service Research Grant No. FR-86 from the N.I.H. Division of Research Facilities and Resources.
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Cravioto, H., O'Brien, J.S., Landing, B.H. et al. Ultrastructure of peripheral nerve in metachromatic leucodystrophy. Acta Neuropathol 7, 111–124 (1966). https://doi.org/10.1007/BF00686778
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DOI: https://doi.org/10.1007/BF00686778