Benzene and toluene activate protein kinase C

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• Protein kinase C (PKC) is crucial for signal transduction in cell activation.
• Tumor promoters like phorbol esters activate PKC by mimicking diacylglycerol.

Purpose of the Study:

• To investigate the mechanism of protein kinase C activation by organic solvents.
• To determine if benzene and toluene activate PKC via the diacylglycerol pathway.

Main Methods:

• In vitro studies on protein kinase C.
• Experiments using intact platelets.
• Assessing the effect of benzene and toluene on [3H]12-O-tetradecanoylphorbol-13-acetate binding.

Main Results:

• Benzene and toluene were identified as activators of protein kinase C.
• These solvents did not inhibit [3H]12-O-tetradecanoylphorbol-13-acetate binding, suggesting a different activation mechanism.
• Chloroform-induced PKC activation also appears to operate via a non-diacylglycerol pathway.

Conclusions:

• Benzene and toluene likely activate protein kinase C through a mechanism distinct from phorbol ester-induced activation.
• The findings suggest a novel pathway for PKC activation by certain organic solvents, potentially similar to chloroform's effect.