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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Neurokinin 1 (NK1) receptors are distributed across the GI tract, vagal afferents, and key CNS regions including the central vomiting center and chemoreceptor trigger zone (CTZ) Chemotherapy agents stimulate enterochromaffin cells in the gastrointestinal (GI) tract to release large amounts of substance P (SP). SP is a neuropeptide released by specific sensory nerves in response to many different stressors, including those in the GI mucosa affected by chemotherapy.  SP binds and activates...
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Area of Science:

  • Immunology
  • Oncology
  • Radiotherapy research

Background:

  • Radiotherapy's anti-cancer effects involve T cells, but Natural Killer (NK) cell roles are unclear.
  • Understanding NK cell involvement can optimize cancer immunotherapy.

Purpose of the Study:

  • To investigate the role of NK cells in radiotherapy's immune response.
  • To elucidate the mechanisms underlying NK cell activity during radiation treatment.

Main Methods:

  • Reverse translational approach combining clinical trial data and experimental models.
  • Analysis of CXCL8 levels and NK cell infiltration in pancreatic cancer patients.
  • In vivo studies using xenografted mice with combined radiotherapy and NK cell transfer.

Main Results:

  • Elevated CXCL8 and increased NK cell infiltration correlated with improved survival in pancreatic cancer patients undergoing radiotherapy.
  • Radiation-induced CXCL8 secretion from senescent tumor cells directed CD56dim NK cell migration.
  • Combined radiotherapy and NK cell therapy enhanced tumor control in experimental models.

Conclusions:

  • NK cells are crucial in the radiation-induced immune response, mediated by CXCL8.
  • Senescence-associated CXCL8 release links innate immune surveillance to NK cell activity in tumors.
  • Combining radiotherapy with NK cell therapy presents a promising strategy for cancer treatment.