Cancer Stem Cells in Moderately Differentiated Lip Squamous Cell Carcinoma Express Components of the Renin-Angiotensin System

Rachna S Ram; Helen D Brasch; Jonathan C Dunne; Paul F Davis; Swee T Tan; Tinte Itinteang

doi:10.3389/fsurg.2017.00030

Cancer Stem Cells in Moderately Differentiated Lip Squamous Cell Carcinoma Express Components of the Renin-Angiotensin System

Front Surg. 2017 Jun 6:4:30. doi: 10.3389/fsurg.2017.00030. eCollection 2017.

Authors

Rachna S Ram¹, Helen D Brasch¹, Jonathan C Dunne¹, Paul F Davis¹, Swee T Tan^{1

2}, Tinte Itinteang¹

Affiliations

¹ Gillies McIndoe Research Institute, Wellington, New Zealand.
² Wellington Regional Plastic, Maxillofacial and Burns Unit, Hutt Hospital, Wellington, New Zealand.

Abstract

Aim: We investigated the expression of the renin-angiotensin system (RAS) by cancer stem cell (CSC) subpopulations we have identified in moderately differentiated lip squamous cell carcinoma (MDLSCC).

Method: Ten MDLSCC samples underwent 3,3-diaminobenzidine (DAB) and immunofluorescent immunohistochemical (IHC) staining for (pro)renin receptor (PRR), angiotensin-converting enzyme (ACE), angiotensin II receptor 1 (ATIIR1), and receptor 2 (ATIIR2). NanoString analysis and Western blotting (WB) were performed on six MDLSCC samples for gene and protein expression, respectively.

Results: IHC staining showed expression of PRR, ATIIR1, and ATIIR2 on cells within the tumor nests (TNs) and the stroma. ACE was localized to the microvessels within the stroma. WB detected PRR, ACE, and ATIIR2. NanoString analysis confirmed gene expression of PRR, ACE, and ATIIR1.

Conclusion: Components of the RAS: PRR, ATIIR1, and ATIIR2 are expressed on two CSC subpopulations in MDLSCC, one within the TNs and the other within the stroma. The endothelium of the microvessels within the stroma expresses ACE.

Keywords: cancer; cancer stem cells; lip; oral cavity; renin–angiotensin system; squamous cell carcinoma.