The roles of microRNA-34b-5p in angiogenesis of thyroid carcinoma

Purpose This study aims to determine the expression of miR-34b-5p in thyroid carcinomas and to investigate the role of miR34b-5p in the modulation of proteins involved in angiogenesis of thyroid carcinoma cells. Methods The expressions of miR-34b-5p levels in five cell lines and 65 tissue samples from thyroid carcinomas were examined by real-time polymerase chain reaction. An exogenous miR-34b-5p (mimic) transiently overexpress miR-34b-5p in theses thyroid carcinoma cells. The effects of miR-34b-5p overexpression on the proteins involved in angiogenesis and cell cycle regulations (VEGF-A, Bcl-2 and Notch1) were investigated by Western blot, immunofluorescence, enzyme-linked immunosorbent assay followed by cell cycle analysis and apoptosis assays. Results miR-34b-5p is markedly downregulated in all thyroid carcinoma cell lines and tissues samples when compared with non-neoplastic immortalised thyroid cell line and non-neoplastic thyroid tissues, respectively. The expression levels of miR-34b were significantly associated with T-stages of thyroid carcinomas (p = 0.042). Downregulation of VEGF-A, Bcl-2 and Notch1 proteins in thyroid carcinoma cells were noted in cells that transiently transfected with miR-34b-5p mimic. In addition, enzyme-linked immunosorbent assay confirmed the decreased expression of VEGF in thyroid carcinoma cells after transfection with miR-34b-5p mimic. Furthermore, miR-34b-5p mimic transfection induces significant accumulation of cells in G0-G1 of the cell cycle by blocking of their entry into the S transitional phase as well as increasing the total apoptosis. Conclusions miR-34b-5p functions as a potent regulator of angiogenesis, apoptosis and cell proliferation via modulation of VEGF-A, Bcl-2 and Notch1 proteins. It could be a target for developing treatment strategies of thyroid carcinoma with aggressive clinical behaviour..

Medienart:

E-Artikel

Erscheinungsjahr:

2017

Erschienen:

2017

Enthalten in:

Zur Gesamtaufnahme - volume:58

Enthalten in:

Endocrine - 58(2017), 1 vom: 24. Aug., Seite 153-166

Sprache:

Englisch

Beteiligte Personen:

Maroof, Hamidreza [VerfasserIn]
Islam, Farhadul [VerfasserIn]
Ariana, Armin [VerfasserIn]
Gopalan, Vinod [VerfasserIn]
Lam, Alfred K. [VerfasserIn]

Links:

Volltext [lizenzpflichtig]

BKL:

44.89$jEndokrinologie

Themen:

Angiogenesis
Bcl-2
MiR-34b
Notch1
Thyroid carcinoma
VEGF

Anmerkungen:

© Springer Science+Business Media, LLC 2017

doi:

10.1007/s12020-017-1393-3

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

OLC2102493806