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Monokine levels in cancer and infection
Gi-Soo Shin1, Bong-Hee Lee, Seong Lee
1Red Cross College of Nursing, Catholic University of Korea, Seoul, Korea.
Annals of Clinical and Laboratory Science
|June 24, 2003
Summary
Monocyte-produced inflammatory cytokines, including tumor necrosis factor-alpha (TNFalpha), macrophage inflammatory protein (MIP), and monokine induced by gamma interferon (MIG), are elevated in cancer and bacterial infections. Their relationships with cell counts differ between these conditions.
Area of Science:
- Immunology
- Oncology
- Infectious Diseases
Background:
- Monocytes are key immune cells involved in host defense against pathogens and tumor surveillance.
- Monokines, such as TNFalpha, MIP, and MIG, are critical mediators of inflammatory and immune responses.
- Altered monokine profiles are implicated in various disease states, including cancer and infections.
Purpose of the Study:
- To investigate and compare the levels of monocyte intracellular monokines (TNFalpha, MIP, and MIG) in patients with cancer versus bacterial infection.
- To explore the relationships between these monokines and monocyte/lymphocyte counts in peripheral blood across different conditions.
- To elucidate the distinct roles of monocytes in cancer and bacterial infection based on monokine production patterns.
Main Methods:
- Utilized multiparameter flow cytometry for quantitative analysis of intracellular monokines.
- Employed comparative fluorescence analysis to assess monokine levels.
- Correlated monokine levels with monocyte and lymphocyte counts in peripheral blood samples.
Main Results:
- Elevated levels of TNFalpha, MIP, and MIG were observed in the peripheral blood of patients with cancer or bacterial infection compared to healthy controls.
- In cancer patients, strong positive correlations were found between TNFalpha and MIP, and between TNFalpha and MIG. TNFalpha and MIG levels correlated with monocyte count.
- In bacterial infection, TNFalpha showed a significant correlation with MIG but not MIP. MIP levels correlated with lymphocyte count, while no monokine correlated with monocyte count.
Conclusions:
- Circulating monocytes contribute significantly to host defense in both cancer and bacterial infection through enhanced monokine production.
- The interrelationships among TNFalpha, MIP, and MIG, as well as their associations with monocyte counts, are distinct in cancer patients compared to those with bacterial infections.
- These findings highlight differential monocyte-mediated immune responses in cancer and bacterial infections, suggesting potential for targeted therapeutic strategies.