The anticancer mechanism of 2'-hydroxycinnamaldehyde in human head and neck cancer cells

Area of Science:

• Oncology
• Molecular Biology
• Pharmacology

Background:

• Cinnamaldehyde derivatives are known to induce apoptosis in cancer cells.
• Head and neck cancers often involve mutations in the p53 tumor suppressor gene.
• Understanding the mechanisms of action of novel anti-cancer agents is crucial for therapeutic development.

Purpose of the Study:

• To investigate the anti-proliferative and apoptotic effects of cinnamaldehyde derivatives 2'-hydroxycinnamaldehyde (HCA) and 2'-benzoyloxycinnamaldehyde (BCA) on human head and neck cancer cells.
• To elucidate the signaling pathways involved in HCA- and BCA-induced apoptosis, particularly in relation to p53 status.
• To explore the role of autophagy in the HCA-induced cell death process.

Main Methods:

• Cell culture of p53-wild (SGT) and p53-mutant (YD-10B) head and neck cancer cell lines.
• Assessment of anti-proliferative effects using cell viability assays.
• Analysis of apoptosis induction via caspase activation (caspase-3, -7, -9), PARP cleavage, and Annexin V-FITC/PI staining.
• Western blot analysis to evaluate the expression of key proteins involved in apoptosis (p21, Bak1, Bcl-2) and autophagy (LC3B).
• Treatment with autophagy inhibitor 3-methyladenine (3-MA) to assess autophagy's role.

Main Results:

• HCA and BCA demonstrated significant anti-proliferative activity against both SGT and YD-10B cells.
• Apoptosis was confirmed by activation of caspases and PARP, and Annexin V/PI staining.
• HCA upregulated p21 expression and modulated Bak1/Bcl-2 ratio, indicating p53-independent apoptosis induction.
• HCA treatment increased LC3B expression, suggesting involvement of autophagy.
• Autophagy inhibition differentially affected HCA-induced apoptosis, enhancing it in SGT cells and inhibiting it in YD-10B cells.

Conclusions:

• HCA and BCA exhibit potent anti-cancer effects on head and neck cancer cells, regardless of p53 mutational status.
• HCA induces apoptosis through p53-independent pathways involving modulation of pro- and anti-apoptotic proteins.
• Autophagy plays a complex, context-dependent role in HCA-induced apoptosis, potentially contributing to therapeutic efficacy.
• HCA represents a promising therapeutic candidate for head and neck cancer treatment.