Cancer Immunology, Immunotherapy

, Volume 54, Issue 12, pp 1153–1161

Regulatory T cells and tumor immunity

  • Subhasis Chattopadhyay
  • Nitya G. Chakraborty
  • Bijay Mukherji


Central deletion of “self-reactive” T cells has been the textbook paradigm for inducing “self-tolerance” in the periphery and the concept of a role of T cell-mediated suppression in this process has long been controversial. A decisive shift in the opinion on suppressor T cells has lately occurred with the observations of Sakaguchi’s group that linked a class of CD4+CD25+ T cells to the prevention of autoimmunity from neonatal thymectomy in mice. These CD4+CD25+ T cells have been named T regulatory (Treg) cells. They are believed to be selected in the thymus as an anti-self repertoire. Hence they were referred to as natural T regulatory (nTreg) cells. Presently, in addition to their role in autoimmunity, they are believed to exert regulatory function in infection, in transplantation immunity as well as in tumor immunity. In contrast to these nTreg cells, another class of CD4+ Treg cells also exercises regulatory function in the periphery. These Treg cells are also CD4+ T cells and after activation they also become phenotypically CD4+CD25+. They are, however induced in the periphery as Treg cells. Hence, they are termed as induced Treg (iTreg) cells. There are major differences in the biology of these two types of Treg cells. They differ in their requirements for activation and in their mode of action. Nonetheless, evidence indicates that both nTreg cells and iTreg cells are involved in the control of tumor immunity. The question of how to circumvent their regulatory constraints, therefore, has become a major challenge for tumor immunologists.


Treg Tumor immunity 



T regulatory


Natural Tregulatory


Inducible T regulatory


T suppressor


Antigen presenting cell


Cytolytic T lymphocytes


Major histocompatibility complex






Tumor associated antigen


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Subhasis Chattopadhyay
    • 1
  • Nitya G. Chakraborty
    • 1
  • Bijay Mukherji
    • 1
  1. 1.University of Connecticut School of MedicineFarmingtonUSA

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