Abstract:
:Burnet proposed in the 1950's that the immune system is engaged in identifying and destroying abnormal cancerous cells. This process, termed immune surveillance, has been at the centre of intense debate for decades. Results using immunodeficient mice lend support to the immune surveillance hypothesis. We surmised that immune surveillance would be hampered by the inhibitory effect of naturally occurring FoxP3(+) regulatory T cells, a population of T cells shown to be present at an increased frequency in a variety of human tumours. The carcinogen, methylcholanthrene was injected subcutaneously into mice and the steady development of fibrosarcomas was observed over approximately 200 days. These fibrosarcomas were strikingly infiltrated with FoxP3(+) regulatory T cells implying that these cells impinge upon immune-mediated rejection of the tumour. This was confirmed by partial ablation of FoxP3(+) regulatory T-cell activity, which resulted in a marked reduction in tumour incidence. The reduction of tumour incidence was ablated in mice that lacked interferon gamma. These data offer strong support for the concept of immune surveillance and indicate that this process is limited by the inhibitory effect of FoxP3(+) regulatory T cells.
journal_name
Br J Cancerjournal_title
British journal of cancerauthors
Betts G,Twohig J,Van den Broek M,Sierro S,Godkin A,Gallimore Adoi
10.1038/sj.bjc.6603824subject
Has Abstractpub_date
2007-06-18 00:00:00pages
1849-54issue
12eissn
0007-0920issn
1532-1827pii
6603824journal_volume
96pub_type
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