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Ref Type Journal Article
PMID (21289267)
Authors Liu R, Liu D, Trink E, Bojdani E, Ning G, Xing M
Title The Akt-specific inhibitor MK2206 selectively inhibits thyroid cancer cells harboring mutations that can activate the PI3K/Akt pathway.
Journal The Journal of clinical endocrinology and metabolism
Vol 96
Issue 4
Date 2011 Apr
URL
Abstract Text The phosphoinositide 3-kinase (PI3K)/Akt pathway is widely postulated to be an effective therapeutic target in thyroid cancer.The aim of the study was to test the therapeutic potential of the novel Akt inhibitor MK2206 for thyroid cancer.We examined the effects of MK2206 on thyroid cancer cells with respect to the genotypes of the PI3K/Akt pathway.Proliferation of thyroid cancer cells OCUT1, K1, FTC133, C643, Hth7, and TPC1, which harbored PIK3CA, PTEN, Ras, or RET/PTC mutations that could activate the PI3K/Akt pathway, was potently inhibited by MK2206 with IC(50) values mostly below or around 0.5 μm. In contrast, no potent inhibition by MK2206 was seen in most of the Hth74, KAT18, SW1736, WRO, and TAD2 cells that did not harbor mutations in the PI3K/Akt pathway. The inhibition efficacy was also genetic-selective. Specifically, the average inhibition efficacies were 59.2 ± 11.3 vs. 36.4 ± 8.8% (P = 0.005) at 1 μm MK2206 and 64.4 ± 11.5 vs. 38.5 ± 18.9% (P = 0.02) at 3 μm MK2206 for cells with mutations vs. cells without. The SW1736 cell, lacking mutations in the PI3K/Akt pathway, had minimal response to MK2206, but transfection with exogenous PIK3CA mutants, PIK3CA H1047R and E545K, significantly increased its sensitivity to MK2206. MK2206 also completely overcame the feedback activation of Akt from temsirolimus-induced mammalian target of rapamycin suppression, and the two inhibitors synergistically inhibited thyroid cancer cell growth.Our study demonstrates a genetic selectivity of MK2206 in inhibiting thyroid cancer cells by targeting the PI3K/Akt pathway, supporting a clinical trial in thyroid cancer.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
PIK3CA E545K thyroid gland cancer sensitive MK2206 Preclinical - Cell culture Actionable In a preclinical study, expression of PIK3CA E545K in a thyroid cancer cell line resulted in increased sensitivity to MK2206 in culture (PMID: 21289267). 21289267
PIK3CA E542K thyroid gland papillary carcinoma sensitive MK2206 Preclinical - Cell culture Actionable In a preclinical study, MK2206 inhibited AKT activation, proliferation, and growth of thyroid cancer cell lines with PI3K/AKT pathway alterations in culture, including a papillary thyroid cancer cell line harboring PIK3CA E542K (PMID: 21289267). 21289267
PIK3CA H1047R thyroid gland cancer sensitive MK2206 Preclinical - Cell culture Actionable In a preclinical study, MK2206 inhibited AKT activation, proliferation, and growth of thyroid cancer cell lines with PI3K/AKT pathway alterations in culture, including an anaplastic thyroid cancer cell line harboring PIK3CA H1047R (PMID: 21289267). 21289267
NRAS Q61R thyroid gland cancer sensitive MK2206 Preclinical - Cell culture Actionable In a preclinical study, MK2206 inhibited AKT activation, proliferation, and growth of thyroid cancer cell lines with PI3K/AKT pathway alterations in culture, including an anaplastic thyroid cancer cell line harboring NRAS Q61R (PMID: 21289267). 21289267
PIK3CA E542K thyroid gland papillary carcinoma sensitive MK2206 + Temsirolimus Preclinical - Cell culture Actionable In a preclinical study, MK2206 suppressed activation of AKT induced by Torisel (temsirolimus), and MK2206 and Torisel (temsirolimus) demonstrated synergy in inhibiting growth of a papillary thyroid cancer cell line harboring PIK3CA E542K in culture (PMID: 21289267). 21289267
HRAS G13R thyroid gland cancer sensitive MK2206 Preclinical - Cell culture Actionable In a preclinical study, MK2206 inhibited AKT activation, proliferation, and growth of thyroid cancer cell lines with PI3K/AKT pathway alterations in culture, including an anaplastic thyroid cancer cell line harboring HRAS G13R (PMID: 21289267). 21289267
PIK3CA H1047R thyroid gland cancer sensitive MK2206 + Temsirolimus Preclinical - Cell culture Actionable In a preclinical study, MK2206 and Torisel (temsirolimus) demonstrated synergy in inhibiting growth of an anaplastic thyroid cancer cell line harboring PIK3CA H1047R in culture (PMID: 21289267). 21289267