Open Access

ARTICLE

Chemokine and chemokine receptor patterns in patients with benign and malignant salivary gland tumors: a distinct role for CCR7

Mohammad Reza Haghshenas¹, Mohammad Javad Ashraf², Bijan Khademi³, Abbas Ghaderi^1,4, Nasrollah Erfani¹, Mahboobeh Razmkhah¹

1 Shiraz Institute for Cancer Research, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
2 Department of Pathology, Khalili Hospital, Shiraz University of Medical Sciences, Shiraz, Iran
3 Otolaryngology Research Center, Department of Otolaryngology, Shiraz University of Medical Sciences, Shiraz, Iran
4 Department of Immunology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran

* Corresponding Authors: A ghaderi, ; ; M Razmkhah, ;

European Cytokine Network 2017, 28(1), 27-35. https://doi.org/10.1684/ecn.2017.0388

Accepted 18 February 2017;

Abstract

Background: To explore the molecular mechanisms involved in pathophysiology of malignant and benign salivary gland tumors (SGTs), we investigated main tumor-inducing chemokines and chemokine receptors, CXCL12/CXCR4/ACKR3 (CXCR7), CXCR3/CXCL10, CCR5/CCL5, CCL21/CCR7, CCL2, CCR4, CXCR5, CCR6, and CXCL8 in tumor tissues. Patients and methods: Parotid tissues were obtained from 30 patients with malignant and benign SGTs. Quantitative real-time polymerase chain reaction (qRT-PCR) was employed to determine the mRNA expression pattern of the mentioned chemokines/chemokine receptors and immunohistochemistry (IHC) was performed to verify the expression of CCR7. Results: Expression levels of CCR7 and CCR4 transcripts were higher in the tumor tissues of malignant cases in comparison to benign ones (p = 0.03 and 0.02). Immunohistochemistry analysis confirmed that the protein level of CCR7 concurred with the mRNA expression. CCL2 gene transcripts were observed with a higher expression in patients with tumor-free lymph nodes (LN^–) and early stages, whereas CCR7 transcript was higher in LN⁺ and late stages of the disease. A significant inverse correlation was found between CXCL10 transcript and tumor size in benign cases. The mRNA expression of CCR7, CCR4, CXCR3, CCL21, CCL5, and CXCL12 was significantly higher in mucoepidermoid carcinoma in comparison to pleomorphic adenoma subtypes (p < 0.05). Conclusion: On the basis of the present study, it was determined that malignant and benign SGTs exhibit a distinct pattern of chemokines and chemokine receptors, which are probably associated with known biological and clinical behaviors of these tumors. Significant increased CCR4 and CCR7 expression in malignant SGTs might play a central role in malignant transformation that introduces them as new targets for cancer immunotherapy.

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