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Fibrosis: a distinguishing feature in the pathology of neural leprosy

Antunes, Sérgio Luiz Gomes ; Jardim, Márcia Rodrigues ; Vital, Robson Teixeira ; Pascarelli, Bernardo Miguel de Oliveira ; Nery, José Augusto da Costa ; Amadeu, Thaís Porto ; Sales, Anna Maria ; da Costa, Eduardo Alves Freire ; Sarno, Euzenir Nunes

Memórias do Instituto Oswaldo Cruz, 2019-01, Vol.114, p.e190056-e190056 [Periódico revisado por pares]

Brazil: Instituto Oswaldo Cruz, Ministério da Saúde

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  • Título:
    Fibrosis: a distinguishing feature in the pathology of neural leprosy
  • Autor: Antunes, Sérgio Luiz Gomes ; Jardim, Márcia Rodrigues ; Vital, Robson Teixeira ; Pascarelli, Bernardo Miguel de Oliveira ; Nery, José Augusto da Costa ; Amadeu, Thaís Porto ; Sales, Anna Maria ; da Costa, Eduardo Alves Freire ; Sarno, Euzenir Nunes
  • Assuntos: fibrosis ; leprosy ; neuropathy ; Original ; PARASITOLOGY ; TROPICAL MEDICINE
  • É parte de: Memórias do Instituto Oswaldo Cruz, 2019-01, Vol.114, p.e190056-e190056
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    SLGA: planning, intellectual and operational coordination, capturing of histological images and writing; MJR: neurological and neuroelectrophysiological evaluation, conduction of nerve biopsies and intellectual advice; RTV: neurological and neuroelectrophysiological evaluation, assistance in nerve biopsies; BP: conduction of immunohistochemical procedures and image capturing and processing; JACN: dermatological evaluation of leprosy patients; TPA: conduction of immunohistochemical procedures; AMS: dermatological evaluation of leprosy patients; EAFC: conduction of immunohistochemical procedures; ENS: intellectual planning and advice.
  • Descrição: Fibrosis in the peripheral nerve is the end stage of leprous neuropathy and the cause of the resulting permanent neural function impairments. Preventive measures to avoid this irreversible pathological state are a relief strategy for leprosy sufferers. The present study describes the frequency of fibrosis along with its characterisation and pathogenic development. Six-hundred-and-thirteen nerve samples were sorted from 278 neural leprosy (NL) and 335 non-leprosy neuropathy patients (ON). The total number of samples was histologically examined by routine staining methods (haematoxylin-eosin, Wade staining and Gomori's trichrome) and fibrosis was evaluated via semi-quantitative estimation. Fibrosis was most frequent in the NL group (33% against 0.4% in ON) while fibrosis in association with endoneurial microfasciculation was found in 38 (41.3%) of the NL samples in the examination of semithin sections. Pericytic activation in the perivascular environment was confirmed to be the source of the fibroblasts and perineurial cells delimiting microfascicles. End-stage fibrosis in leprosy displays an arrangement of microfascicles devoid of neural components (i.e., Schwann cells and axons) lined by an intermediate phenotype of fibroblastic-perineurial cells filled with bundles of collagen fibres. The present study underscores that fibrosis is frequently the severe end stage of neural leprosy NL pathogeny after analysing the notably distinct development of fibrosis within the neural environment.
  • Editor: Brazil: Instituto Oswaldo Cruz, Ministério da Saúde
  • Idioma: Inglês;Português
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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