Rosmarinic Acid Is an hCtr1 Inhibitor that Interferes with Copper Transport Activity

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• Human copper transporter 1 (hCtr1) regulates cellular copper uptake and homeostasis.
• Dysregulation of copper transport can lead to cellular toxicity.
• No specific inhibitors for hCtr1 are currently available.

Purpose of the Study:

• To identify inhibitors of hCtr1 function.
• To explore the potential of natural compounds in modulating cellular copper levels.
• To investigate rosmarinic acid (RA) as a potential hCtr1 inhibitor.

Main Methods:

• In vitro binding assays to assess RA interaction with hCtr1.
• Cellular assays to evaluate the effect of RA on copper uptake and hCtr1 function.
• Analysis of RA's impact on copper-induced cytotoxicity.

Main Results:

• Rosmarinic acid (RA) directly binds to the N-terminal copper-binding domain of hCtr1.
• RA forms a ternary complex (RA/Cu/hCtr1), inhibiting copper transport.
• RA treatment reduced copper uptake, alleviated copper overload, and attenuated cytotoxicity in cells.

Conclusions:

• Rosmarinic acid acts as a moderate-strength inhibitor of hCtr1.
• RA offers a novel therapeutic strategy for modulating intracellular copper homeostasis.
• This finding provides a promising lead compound for treating copper-related pathologies.