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Chemokine receptor desensitization in tumor-bearing mice
R A Kurt1, A Baher, K P Wisner
1Laboratory of Cellular Immunology, Oregon Cancer Center, Portland, Oregon 97213, USA. kurtr@lafayette.edu
Cellular Immunology
|March 13, 2001
Summary
Murine breast cancer cells secrete chemokines that attract T cells. However, tumor-bearing mice show impaired T cell function, potentially explaining tumor growth despite chemokine production.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Murine breast cancer cell line 4T1 constitutively produces chemokines.
- These chemokines are capable of recruiting T cells.
- Tumor cell supernatants demonstrate functional T cell chemotaxis.
Purpose of the Study:
- To investigate the functional capacity of T cells in tumor-bearing mice.
- To understand the mechanisms behind impaired T cell chemotaxis in cancer.
- To correlate chemokine secretion with tumor progression.
Main Methods:
- Analysis of chemokine production by 4T1 cells.
- Assessment of T cell chemotaxis using tumor cell supernatants.
- Evaluation of splenic T cell chemotactic ability in tumor-bearing mice.
- Measurement of chemokine receptor desensitization.
Main Results:
- 4T1 cells produce functional chemokines that recruit T cells.
- T cells from tumor-bearing mice exhibit impaired chemotaxis.
- Desensitization of chemokine receptors (RANTES, MCP-1, SLC) was observed.
- Functional chemokine production by tumors contrasts with impaired T cell response.
Conclusions:
- Despite secreting chemokines, tumors may evade immune surveillance due to impaired T cell chemotaxis.
- Desensitized chemokine receptors contribute to the reduced T cell migration.
- This impaired immune cell recruitment may facilitate progressive tumor growth in the host.