Andrzej Kutner

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We characterized a structure-function relationships of four analogs of vitamin D(2) with extended and branched side-chains. We tested their ability to induce differentiation of human acute myeloid leukemia (AML) cells both in vitro and ex vivo. Our experiments on five human cell lines revealed substantial differences among tested analogs. Analogs with(More)
Active vitamin D analogs that are less toxic than calcitriol can be useful in the combined treatment of patients suffering from colon cancer. In the present study we demonstrate, for the first time in an in vivo model system, the biological effect of combined therapy using 5-fluorouracil (5-FU) along with vitamin D analog PRI-2191 (tacalcitol,(More)
Synthetic analogs of vitamin D for potential use in differentiation therapy should selectively regulate genes necessary for differentiation without inducing any perturbations in calcium homeostasis. PRI-1906, an analog of vitamin D2, and PRI-2191, an analog of vitamin D3 bind nuclear vitamin D receptor (nVDR) with substantially lower affinity than(More)
A series of 24-homologated 1,25-dihydroxyvitamin D3 compounds have been chemically synthesized and studied with regard to their activity in inducing differentiation of human promyelocyte HL-60 cells to monocytes and in calcium mobilizing activity in vitamin D deficient rats. Homologation of 1,25-dihydroxyvitamin D3 or its delta 22 analogue by one or two(More)
Besides its calcium mobilizing activity in vivo, 1,25-dihydroxyvitamin D3 has the ability to induce differentiation of human promyelocytic leukemia cells in vitro. We studied the cell differentiating activity of four novel analogues of 1,25-dihydroxyvitamin D3, using the HL60 cell line as a model. We also analyzed the influence of these compounds on the(More)
The results of our studies on the biological activity of side-chain modified analogues of vitamin D are reviewed. These analogues appeared to be effective in induction of cell differentiation, inhibition of tumour cell proliferation in vitro and in increasing of antitumour effect of cytostatics. On the other hand, inhibition of cytostatic-induced apoptosis(More)
Calcitriol is a potent antiproliferative agent against various tumour cells in vitro. Its biological activity is mediated by the vitamin D receptors (VDRs). Here, we present the results of a study on vitamin D3 compounds (calcitriol and its analogue PRI-2191) as potential agents in combined antitumour therapy in vitro. Applying antiproliferative SRB and MTT(More)
The antiproliferative in vitro activity of side-chain modified analogues of 1,25-dihydroxyvitamin D3 was examined in order to select compounds with potential antitumour activity. Analogues PRI-1906, PRI-1907, PRI-1909, PRI-2191, PRI-2192, PRI-2193 and PRI-2194 were examined for their antiproliferative activity in vitro against a spectrum of various human(More)
The evidence for the promising potential for derivatives of Vitamin D (deltanoids) in the treatment of myeloid leukemias is increasing, but currently is not matched by the understanding of the precise mechanisms by which these anti-neoplastic effects are achieved. Unlike solid tumors in which growth retardation by deltanoids appears to result from(More)
Human myeloid leukemia cell lines are induced to terminal differentiation into monocyte lineage by 1,25-dihydroxyvitamin D3 (1,25D3) or its analogs (deltanoids). However, translation of these findings to the clinic is limited by calcemic effects of deltanoids. Strategies to overcome this problem include combination of deltanoids with other compounds to(More)