Major 5'terminally deleted enterovirus populations modulate type I IFN response in acute myocarditis patients and in human cultured cardiomyocytes.

Scientific Reports
M GlenetFrench Enterovirus Myocarditis Study Group (FEMSG)

Abstract

Major 5'terminally deleted (5'TD) group-B enterovirus (EV-B) populations were identified in heart biopsies of patients with fulminant myocarditis or dilated cardiomyopathy suggesting that these 5'TD forms are key drivers of host-cell interaction in EV cardiac infections. To date, early emergence of EV-B 5'TD forms and its impact on type 1 IFN response during acute myocarditis remains unknown. Using quantitative RACE-PCR assay, we identified major EV-B 5'TD RNA populations in plasma or heart samples of acute myocarditis cases. Deletions identified within the 5' non-coding region of EV-B populations only affected secondary-structural elements of genomic RNA domain I and were distinguished in two major groups based on the extent of RNA structural deletions. Proportions of these two respective EV-B 5'TD population groups were positively or negatively correlated with IFN-β levels in plasma samples of myocarditis patients. Transfection of synthetic CVB3/28 RNAs harboring various 5'terminal full-length or deleted sequences into human cultured cardiomyocytes demonstrated that viral genomic RNA domain I possessed essential immunomodulatory secondary-structural elements responsible for IFN-β pathway induction. Overall, our results highli...Continue Reading

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Methods Mentioned

BETA
biopsies
transfection
reverse transcription PCR
reverse
biopsy
PCR
electrophoresis
ELISA

Software Mentioned

GraphPad Prism
SAS
Clustal W
MEGA
GraphPad

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