Publications by authors named "Keima Osawa"

Article Synopsis
  • The study focuses on creating dual inhibitors targeting both EGFR and JNK-2, crucial for combating multifactorial diseases like cancer.
  • Five tested compounds, particularly 5b, 5d, and 6h, exhibited strong inhibitory effects on various cancer cell lines, with IC values indicating effective potency.
  • Docking studies confirmed the compounds' binding ability to critical regions of proteins, suggesting potential for inducing apoptosis and halting the cell cycle in cancer cells.
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New 1,5-diarylpyrazole oxime hybrid derivatives (scaffolds and ) were designed, synthesized, and then their purity was verified using a variety of spectroscopic methods. A panel of five cancer cell lines known to express EGFR and JNK-2, including human colorectal adenocarcinoma cell line DLD-1, human cervical cancer cell line Hela, human leukemia cell line K562, human pancreatic cell line SUIT-2, and human hepatocellular carcinoma cell line HepG2, were used to biologically evaluate for their in vitro cytotoxicity for all the synthesized compounds -, -, -, and -. The oxime containing compounds 8a-j and 10a-c were more active as antiproliferative agents than their non-oxime congeners 7a-j and 9a-c.

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The burkholdines are a family of cyclic lipopeptides reported to exhibit antifungal activity. We synthesized a series of 18 burkholdine analogues in good yield by conventional Fmoc-SPPS followed by cyclization with DIPCI/HOBt in the solution phase. Although none of the synthesized peptides exhibited antifungal activity, several did potentiate the antibiotic effect of the antibiotic G418, including the Thr-bearing Bk analogue () and the tartaramide-bearing Bk analogue ().

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