Cytokines and Mycobacterium leprae induce apoptosis in human Schwann cells.

Abstract:

:The development of deformities during the course of leprosy disease is a major public health concern worldwide. It is possible that cytokine production and apoptosis of Schwann cells (SCs) directly affect nerve degeneration and regeneration leading to injury of the myelin sheath and axon. In the present study, the expression of TNFalpha, TGFbeta, and their receptors, in addition to cell death triggered by cytokines or whole Mycobacterium leprae were investigated in a human SC line. The results showed the presence of TNF-Rs and TGF-RII on the SC membrane and the shedding of TNF-Rs during the culture period. Evaluation of cell death was performed through TUNEL and flow cytometry techniques. TNFalpha/TGFbeta combination as well as M. leprae infection triggered an increase in the apoptosis rate in the cultured SC. Moreover, reverse transcriptase-polymerase chain reaction assay revealed that M. leprae upregulated the expression of such cytokines and their receptors on the SC line. Despite the detection of TNFalpha mRNA, no protein was found in the culture supernatants. The data indicate that induction of SC death after cell interaction with M. leprae may, in fact, be implicated in the pathogenesis of nerve damage, which can most likely be modulated by in vivo cytokine production.

authors

Oliveira RB,Sampaio EP,Aarestrup F,Teles RM,Silva TP,Oliveira AL,Antas PR,Sarno EN

doi

10.1097/01.jnen.0000182982.09978.66

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

882-90

issue

10

eissn

0022-3069

issn

1554-6578

pii

00005072-200510000-00007

journal_volume

64

pub_type

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