Title:MicroRNA Levels in Cervical Cancer Samples and Relationship with Lesion Grade and HPV Infection
Volume: 10
Issue: 2
Author(s): Carolina R. Hoelzle, Solène Arnoult, Cinthya R.M. Borém, Mariana Ottone, Kênia C.S.F. de Magalhães, Istéfani L. da Silva*Renata T. Simões
Affiliation:
- Center for Biological and Health Sciences, Federal University of West of Bahia (UFOB), Bahia,Brazil
Keywords:
Oncomir, circulating miRNAs, miR-21, miR-let-7a, miR-214, human papilloma virus.
Abstract:
Background: miR-21, miR-214 and miR-let-7a are three validated and well-known miRNAs.
miR-21 is described as an “oncomir” while miR-214 and miR-let-7a are described mainly as
tumor suppressors. The role of these miRNAs remains unclear in cervical cancer, an important malignancy
among women worldwide and responsible for many deaths every year.
Objective: The objective of this study is to describe the expression profile of miR-21, miR-214 and
miR-let-7a in plasma and in cervical scraping from a control group and patients with different
grades of cervical lesions and invasive cervical cancer and correlate with HPV infection groups.
Methods: Plasma and cervical scraping were submitted to DNA and RNA extraction. HPV detection
and typing were performed by conventional PCR followed by PAGE to amplicons interpretation.
The miRNA relative expression in plasma and cervical scraping samples was performed by real
time PCR using specific TaqMan probes.
Results: miR-21 (p=0.0277) and miR-214 (p=0.0151) were up-regulated in cervical scraping samples
of invasive cervical cancer (ICC) group. However, miR-214 was also up-regulated in the LSIL
group (p=0.0062). Both miRNAs were not related to HPV infection. However, miR-let-7a was
higher in HPV positive plasma samples (p=0.0433) than in HPV negative plasma samples and the
correlation analysis confirmed the association between the levels of this miRNA with the presence
of HPV (p=0.0407; r=0.3029), but not with lesion grade (p>0.05).
Conclusion: Our results suggest that miR-21 is related to cervical cancer progression and miR-214
appears to have an ambiguous role in cervical lesions. miR-let-7a may be upregulated at a systemic
level in patients with HPV infection.