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Intraperitoneal macrophages and tumor immunity: A review
1Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts, USA.
Abstract:
The macrophage (Mphi) is considered the first line of defense in immune response to foreign invaders. Increasing evidence suggests that Mphi(s) also play an important role against neoplastic cells. Mphi(s) exposed to supraphysiologic concentrations of CO(2) are suppressed. As surgeons apply newer minimally invasive techniques to oncologic therapies, it is important to evaluate the impact of these techniques on host-tumor interactions. We review the current understanding of Mphi biology with specific attention on cytotoxicity in addition to tumor immunity. Although systemic immune function is better preserved after laparoscopy than laparotomy, peritoneal Mphi(s) show reduced function after CO(2) pneumoperitoneum than exposure to air. Mphi(s) have shown cytotoxicity to syngeneic cancer cells and may play an important role in tumor surveillance. The impairment in Mphi function after CO(2) exposure may have an effect on outcome after oncologic surgery. In our understanding, Mphi(s) help destroy neoplastic cells. As CO(2) impairs Mphi activity, laparoscopy may significantly alter the host-tumor interaction.
Insights
Carbon dioxide (CO2) used in laparoscopic surgery suppresses macrophages, immune cells crucial for destroying cancer cells. This impairment may negatively impact oncologic surgery outcomes by altering the host-tumor interaction.
Area of Science:
- Immunology
- Oncology
- Surgical Innovation
Background:
- Macrophages (Mphi) are key immune cells involved in defending against pathogens and neoplastic cells.
- Evidence suggests Mphi play a role in tumor immunity and surveillance.
- Supraphysiologic concentrations of carbon dioxide (CO2) can suppress Mphi function.
Purpose of the Study:
- To review the current understanding of Mphi biology, focusing on cytotoxicity and tumor immunity.
- To evaluate the impact of minimally invasive oncologic therapies, specifically CO2 pneumoperitoneum, on Mphi function.
- To assess the potential consequences of altered Mphi activity on host-tumor interactions in cancer surgery.
Main Methods:
- Literature review of Mphi biology, cytotoxicity, and tumor immunity.
- Analysis of studies comparing immune function after laparoscopic versus laparotomy procedures.
- Examination of the effects of CO2 pneumoperitoneum on peritoneal Mphi function.
Main Results:
- Systemic immune function is generally better preserved after laparoscopy compared to laparotomy.
- Peritoneal Mphi exhibit reduced function following CO2 pneumoperitoneum compared to exposure to air.
- Macrophages demonstrate cytotoxicity against syngeneic cancer cells, highlighting their role in tumor surveillance.
Conclusions:
- Impairment of Mphi function by CO2 exposure during laparoscopy may significantly affect outcomes in oncologic surgery.
- The reduced Mphi activity could alter the critical host-tumor interaction necessary for cancer control.
- Further research is warranted to understand and mitigate the effects of CO2 on Mphi in cancer patients undergoing laparoscopic procedures.