Frequency Over Function: Raised Levels of CD127low/- Regulatory T cells in the Tumour Microenvironment Compared with the Periphery of Head and Neck Cancer Patients
|Samantha Drennan1, Nicholas D. Stafford1, John Greenman2 and Victoria L. Green2*|
|1Hull York Medical School, University of Hull, HU6 7RX, UK|
|2School of Biological, Biomedical and Environmental Sciences, University of Hull, HU6 7RX, UK|
|Corresponding Author :||Victoria Green Ph.D
Daisy Building Laboratories
Castle Hill Hospital, Castle Road
Hull.HU16 5JQ, UK
Tel: 01482 461892
E-mail: [email protected]
|Received May 27, 2014; Accepted July 23, 2014; Published July 30, 2014|
|Citation: Drennan S, Stafford ND, Greenman J, Green L (2014) Frequency Over Function: Raised Levels of CD127low/- Regulatory T cells in the Tumour Microenvironment Compared with the Periphery of Head and Neck Cancer Patients. J Clin Cell Immunol 5:241. doi: 10.4172/2155-9899.1000241|
|Copyright: © 2014 Drennan S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.|
|Related article at
Pubmed Scholar Google
Objective: Regulatory T cells (Tregs) are known to infiltrate the tumour microenvironment of many cancers, including head and neck malignancies, and are thought to contribute to the host's impaired anti-tumour immune response. However, their immunosuppressive function remains poorly understood within the tumour microenvironment and this study aimed to address this.
Methods: The frequency and suppressive capacity of two CD4+CD127low/- Treg populations, separated on the basis of different levels of CD25 expression (CD25inter and CD25high), from the tumour/node microenvironment and peripheral circulation of newly-presenting head and neck squamous cell carcinoma patients (n=19), were assessed using multicolour flow cytometry.
Results: The proportion of Tregs (CD4+CD25high/interCD127low/-) in the tumour/node microenvironment was significantly elevated compared with the peripheral circulation (p<0.001) and similar percentages were present in both the primary tumour and metastatic lymph node. The percentage of suppression induced by Tregs isolated from tumour associated nodes on the proliferation of nodal effector T cells was similar to that of peripheral Tregs on peripheral effector T cells. However, when the suppressive activity of both nodal and peripheral Tregs was compared on the same peripheral effectors, peripheral Tregs suppressed proliferation to a greater extent.
Conclusion: This work shows that the recruitment and percentages of tumour infiltrating Tregs are key factors in modulating the immune environment of head and neck tumours.