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|Ref Type||Journal Article|
|Authors||Ueno S, Kimura T, Yamaga T, Kawada A, Ochiai T, Endou H, Sakurai H|
|Title||Metformin enhances anti-tumor effect of L-type amino acid transporter 1 (LAT1) inhibitor.|
|Journal||Journal of pharmacological sciences|
|Abstract Text||In many cancer cells, L-type amino acid transporter 1 (LAT1) transports neutral amino acids with bulky side chain, which activate mammalian target of rapamycin (mTOR) to cause cell proliferation. An anti-diabetic drug, metformin, has been shown to activate AMP-activated protein kinase (AMPK), which leads to inhibition of mTOR. LAT1 inhibition in combination with metformin could result in more prominent suppression of mTOR activity.Anti-proliferative effect of a newly developed LAT1 specific inhibitor JPH203 in combination with metformin is evaluated in 2 head and neck cancer cell lines, Ca9-22 and HEp-2 cells and in nude mice inoculated with Ca9-22 cells.By MTT assay, 0.5 mM metformin inhibited proliferation of Ca9-22 cells to 70% of control. In the presence of 100 μM JPH203, proliferation of Ca9-22 cells was inhibited to 60% of control. By combining these 2 drugs, proliferation of Ca9-22 was significantly inhibited to 40% of control. However, this regimen was not very effective against HEp-2 cells. This combination also suppressed in vivo growth of Ca9-22 cells in a xenotransplant model. A combination of anti-LAT1 drug with metformin may be an effective anti-proliferative therapy for certain subsets of cancers.|
|Molecular Profile||Treatment Approach|
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|Therapy Name||Drugs||Efficacy Evidence||Clinical Trials|
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|Gene||Variant||Impact||Protein Effect||Variant Description||Associated with drug Resistance|
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|Unknown unknown||head and neck squamous cell carcinoma||not applicable||JPH203 + Metformin||Preclinical - Cell line xenograft||Actionable||In a preclinical study, the combination of JPH203 (KYT-0353) and Glucophage (metformin) decreased proliferation of head and neck squamous cell cancer cell lines in culture, and reduced tumor growth in a head and neck squamous cell cancer cell line xenograft model (PMID: 27262901).||27262901|