CREB-mediated Bcl-2 expression in trichosanthin-induced Hela cell apoptosis

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Bcl-2 is crucial for regulating cell death.
• Bcl-2 expression is modulated by the transcription factor cyclic AMP response element-binding protein (CREB).
• Trichosanthin (TCS) treatment leads to down-regulation of Bcl-2 during apoptosis.

Purpose of the Study:

• To investigate the role of CREB activation in trichosanthin (TCS)-induced apoptosis in Hela cells.
• To elucidate the regulatory mechanism of Bcl-2 expression in TCS-mediated cell death.

Main Methods:

• Assessing protein levels of Bcl-2 and phosphorylated CREB in Hela cells treated with TCS.
• Utilizing cAMP agonists to counteract TCS effects.
• Employing antisense treatment to suppress CREB expression.
• Using a CRE decoy oligonucleotide to block CREB-binding protein interaction with the Bcl-2 CRE.

Main Results:

• TCS-induced Hela cell apoptosis correlated with decreased Bcl-2 and phosphorylated CREB levels.
• Combined treatment with TCS and cAMP agonists abolished the inhibitory effect on Bcl-2 and CREB.
• Suppression of CREB expression or blocking CREB-binding protein interaction abrogated TCS-mediated Bcl-2 down-regulation.

Conclusions:

• CREB plays a critical role in regulating Bcl-2 expression during TCS-induced Hela cell apoptosis.
• The findings highlight a signaling pathway involving CREB in the control of cell death mediated by TCS.