Dimerization of Doxorubicin Causes Its Precipitation

Area of Science:

• Biochemistry
• Pharmacology
• Chemical Engineering

Background:

• Doxorubicin (DOX) is a vital chemotherapy agent with potent anticancer properties.
• DOX's utility is limited by its precipitation in neutral buffers and with certain drugs, impacting its administration and efficacy.

Purpose of the Study:

• To investigate the cause of Doxorubicin precipitation in neutral solutions.
• To elucidate the structure and formation mechanism of Doxorubicin dimers.

Main Methods:

• Mass spectrometry was employed to analyze the composition of Doxorubicin precipitates.
• Experimental reaction modeling was used to establish the dimerization mechanism.

Main Results:

• Doxorubicin precipitates in neutral buffers and 5-fluorouracil (5-FU) solutions due to the formation of covalently bonded DOX dimers.
• A proposed structure for the DOX dimer and its dimerization mechanism were established.

Conclusions:

• The formation of covalently bonded DOX dimers is responsible for Doxorubicin precipitation.
• Understanding DOX dimer formation is critical for optimizing its use in chemotherapy and biomedical research.