We examined the effects of CI-973 (supplied by Parke-Davis) on several human leukemia cell lines and a Chinese hamster ovary (CHO) line and their drug-resistant counterparts. The cell lines used were HL-60, HL-60/mAMSA, HL-60/DOX, KBM3, KBM3/mAMSA 6, KBM3/mAMSA 6(85), CHO, and CHO/AC-7. DOX, mAMSA, and AC-7 indicate resistance to doxorubicin, amsacrine, or 1-beta-D-arabinofuranosylcytosine, res...

The mammalian target of rapamycin (mTOR) is a key regulator of growth and survival in many cell types. Its constitutive activation has been involved in the pathogenesis of various cancers. In this study, we show that mTOR inhibition by rapamycin strongly inhibits the growth of the most immature acute myeloid leukemia (AML) cell lines through blockade in G0/G1 phase of the cell cycle. Accordingl...

In chronic myeloid leukemia (CML), mechanisms of resistance to imatinib mesylate (Glivec), a selective Bcr-Abl kinase inhibitor, have been traced to Bcr-Abl reactivation, most frequently by mutations in the kinase domain of Bcr-Abl, or to BCRABL amplification. Bcr-Abl overexpression not only directly modulates sensitivity to imatinib, it may also indirectly influence treatment response by influ...

Interleukin 4 (IL-4) suppresses the growth of acute lymphoblastic leukemia (ALL) cells, but its clinical usefulness is limited by proinflammatory activity due mainly to the interaction of cytokine with endothelial cells and fibroblasts. Stroma-supported cultures of leukemic lymphoblasts were used to test the antileukemic activity of an IL-4 variant, BAY 36-1677, in which the mutations Arg 121 t...

Recently, interest in studying pigments from lichens has been aroused due to their bioactive properties and health benefits. The Geolashon (Teloschistes flavicans) is a thousand-year-old lichen the Peruvian Andes characterized by its yellow filaments, traditionally used inhabitants as natural pigment for making handicrafts medicinal purposes. In this sense, article aims compile all studies on s...

Infections may require discontinuation of antineoplastic chemotherapy, which, in turn, renders patients vulnerable to disease progression or relapse. We identified six patients with acute leukemia in whom antineoplastic treatment had to be discontinued because of chronic disseminated candidiasis (CDC). However, despite minimal antileukemic treatment, all patients remained in complete remission....