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Profile of human endogenous retroviruses W family expression in Multiple Sclerosis patients

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Author(s):
Luiz Henrique da Silva Nali
Total Authors: 1
Document type: Doctoral Thesis
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Instituto de Medicina Tropical de São Paulo (IMT)
Defense date:
Examining board members:
Camila Malta Romano; Thelma Suely Okay; Enedina Maria Lobato de Oliveira; Leonilda Maria Barbosa dos Santos
Advisor: Camila Malta Romano
Abstract

Introduction: Multiple Sclerosis (MS) is an autoimmune disease which drastically affects motor, cognitive and sensitive capability of the patients. It seems that Human Endogenous Retrovirus W family (HERV-W) may play a role in MS pathogenesis. Therefore, the aim of this study was to analyze the transcriptome of these individuals and to analyze the HERV-W loci differentially expressed. Materials and Methods: PBMC and serum samples were collected from MS patients in relapsing conditions (GS), MS patients in advanced conditions (GA) and healthy individuals (GC). HERV-W Env amplicon was sequenced in Ion Torrent and mRNA was sequenced in illumina HISeq2500 platform. Besides HERV-W analysis, genic pathways analysis was performed and inflammatory cytokines and chemokines were tested. Results: A total of 23 MS patients (16 from GS and 7 from GA) and 36 from GC were enrolled in the study. MS patients presented 3-fold higher expression than healthy individuals. Amplicon sequencing revealed that MS groups presented more active loci than GC. Despite the limitations due to variations between sequencing runs, the transcriptome revealed that HERV-K11 was differentially expressed in GS, and 19 HERVs were differentially expressed in GA. New HERV-W loci and other loci that were reported as active loci previously are described here. The genic pathway analysis revealed that individuals from GS presented an inflammatory profile, also confirmed by cytokines dosage, where IL-6, IL-1?, TNF-?, IFN-? were significantly higher in GS. In the other hand, individuals from GA presented a non inflammatory profile with neuronal repair pathways inactivated Conclusions: MS patients present higher level and diversity of HERV-W expression than GC. Regardless the similar profile of HERV-W expression in MS groups, there are differentially expressed HERV-W loci depending of each MS group. MS patients present distinct genic expression profile, where GS presented an inflammatory pathway with vascular permeability, whereas GA presented a neurodegenerative profile (AU)

FAPESP's process: 13/24223-9 - Expression profile of Human endogenous retrovirus W (HERV-W)in individuals with Multiples Sclerosis under relapsing conditions
Grantee:Luiz Henrique da Silva Nali
Support type: Scholarships in Brazil - Doctorate