Proton pump inhibitors induce a caspase-independent antitumor effect against human multiple myeloma

Area of Science:

• Hematology
• Oncology
• Pharmacology

Background:

• Multiple Myeloma (MM) is a prevalent hematological malignancy with limited therapeutic options and stagnant survival rates.
• Novel drugs have not significantly improved patient outcomes.
• Proton pump inhibitors (PPIs) exhibit antitumor properties, acting as single agents or in combination therapies.

Purpose of the Study:

• To investigate the anti-tumor effectiveness of Lansoprazole and Omeprazole against human MM cells.
• To determine the mechanisms underlying the anti-MM effects of these PPIs.

Main Methods:

• In vitro assessment of Lansoprazole and Omeprazole cytotoxicity against human MM cell lines.
• Evaluation of Lansoprazole's mechanism of action, focusing on apoptosis and proliferation pathways.

Main Results:

• Lansoprazole demonstrated significant anti-MM efficacy, even at suboptimal concentrations (50 µM).
• Omeprazole exhibited limited cytotoxic action against MM cells.
• Lansoprazole's effect was primarily mediated by caspase-independent apoptosis, with a secondary impact on proliferation.

Conclusions:

• Lansoprazole shows considerable potential as a therapeutic agent against MM, surpassing current treatment efficacy.
• Lansoprazole presents a favorable safety profile with no reported side effects.
• Combining Lansoprazole with existing anti-myeloma therapies may enhance treatment outcomes for MM patients.