Upregulation of stem cell markers ALDH1A1 and OCT4 as potential biomarkers for the early detection of cervical carcinoma

Tulake,Wuniqiemu; Yuemaier,Reziwanguli; Sheng,Lei; Ru,Mingfang; Lidifu,Dilare; Abudula,Abulizi

doi:10.3892/ol.2018.9381

Upregulation of stem cell markers ALDH1A1 and OCT4 as potential biomarkers for the early detection of cervical carcinoma

Authors:
- Wuniqiemu Tulake
- Reziwanguli Yuemaier
- Lei Sheng
- Mingfang Ru
- Dilare Lidifu
- Abulizi Abudula
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Affiliations: Department of Biochemistry and Molecular Biology, Xinjiang Medical University, Urumqi, Xinjiang 830011, P.R. China, Department of Clinical Research, People's Hospital of Xinjiang Uighur Autonomous Region, Urumqi, Xinjiang 830001, P.R. China, Key Laboratory of The Chinese Ministry of Education and Xinjiang Uighur Autonomous Region for High‑Incident Diseases in Uighur Ethnic Population, Xinjiang Medical University, Urumqi, Xinjiang 830011, P.R. China, Department of Gynecology, Third Affiliated Tumor Hospital, Xinjiang Medical University, Urumqi, Xinjiang 830011, P.R. China
Published online on: September 3, 2018 https://doi.org/10.3892/ol.2018.9381
Pages: 5525-5534
Copyright: © Tulake et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Previous studies have reported the upregulation of stem cell biomarkers that are associated with tumorigenesis, in particular with cancer infiltration, recurrence and metastasis. Infection by human papilloma virus (HPV) is the main etiopathological factor of cervical carcinogenesis, but the expression of stem cell markers in cervical carcinoma and HPV infection have yet to be investigated so far. A total of 94 cases of fresh cervical tissues, 116 cases of paraffin‑embedded cervical specimens and 72 cases of peripheral blood samples were collected from Uighur women who were either diagnosed with cervical squamous cell carcinoma (SCC) or cervical intraepithelial neoplasia (CIN) II‑III, or from healthy subjects (negative controls, NC). HPV infection was detected in tissue DNA by polymerase chain reaction (PCR) with a HPV genotyping kit. The mRNA expression levels of aldehyde dehydrogenase 1 family member A1 (ALDH1A1), nanog homeobox (NANOG), POU class 5 homeobox 1 (OCT4), SRY‑box 2 (SOX2) and twist family BHLH transcription factor 1 (Twist1) were determined using reverse transcription‑quantitative PCR (RT‑qPCR). Histological analysis was performed in order to examine the protein expression of ALDH1A1 and OCT4 in paraffin‑embedded tissue specimens by immunohistochemical staining and the plasma levels of those two proteins was measured by ELISA. RT‑qPCR analysis indicated a significant increase in the mRNA expression of ALDH1A1 and OCT4 in CIN II‑III and SCC tissue specimens compared with NC (P<0.05). Although the expression levels of NANOG, SOX2 and Twist1 were significantly higher in SCC compared with NC (P<0.05), no significant difference was revealed in CIN II‑III tissues compared with SCC or NC (P>0.05). Subsequent analysis by immunohistochemistry staining confirmed that the upregulation of ALDH1A1 and OCT4 was also significantly increased in SCC and CIN II‑III compared with controls at the protein level. Notably, ELISA analysis detected significantly higher levels of ALDH1A1 and OCT4 in the peripheral blood (plasma) of patients with SCC compared with healthy subjects. The upregulation of stem cell markers ALDH1A1 and OCT4 in cervical carcinoma and its precursor lesions, in particular in the peripheral blood, indicates that ALDH1A1 and OCT4 may serve as biomarkers for the early detection of cervical carcinoma or for the monitoring of treatment of patients.

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