AIM2 regulates viability and apoptosis in human colorectal cancer cells via the PI3K/Akt pathway

Area of Science:

• Immunology
• Oncology
• Molecular Biology

Background:

• Absent in melanoma 2 (AIM2) is a cytoplasmic DNA sensor crucial for innate immunity and inflammasome activation.
• AIM2 has shown potential in suppressing cancer cell proliferation, with its gene mutations frequently found in colorectal cancer (CRC).
• The precise mechanism by which AIM2 inhibits tumor growth, particularly in CRC, is not fully understood.

Purpose of the Study:

• To investigate the role of Absent in melanoma 2 (AIM2) in colorectal cancer (CRC) cell proliferation and apoptosis.
• To elucidate the molecular mechanism underlying AIM2's tumor-suppressive function in CRC.
• To evaluate AIM2 as a potential therapeutic target for colorectal cancer.

Main Methods:

• Reconstruction of AIM2 expression in HCT116 CRC cells using lentivirus transfection.
• Assessment of cell viability using MTT assay.
• Analysis of apoptosis and cell cycle progression via flow cytometry.
• Investigation of signaling pathways, including PI3K/Akt, using Western blot analysis.

Main Results:

• Restored AIM2 expression significantly inhibited CRC cell viability and increased apoptosis rates.
• AIM2 expression led to cell cycle arrest at the G1 to S phase transition.
• Western blot analysis revealed that AIM2 suppresses CRC cell apoptosis by inhibiting the PI3K/Akt signaling pathway.
• AIM2 functions as a tumor suppressor in colorectal cancer.

Conclusions:

• Absent in melanoma 2 (AIM2) exhibits significant tumor-suppressive properties in colorectal cancer.
• AIM2 inhibits CRC cell proliferation and induces apoptosis, partly through the suppression of the PI3K/Akt pathway.
• Restoring AIM2 expression represents a promising therapeutic avenue for colorectal cancer treatment.