1,25(OH)(2)-16-ENE-VITAMIN-D-3 IS A POTENT ANTILEUKEMIC AGENT WITH LOW POTENTIAL TO CAUSE HYPERCALCEMIA

Compounds that induce cancer cells to differentiate are clinically effective for several types of malignancies. The 1,25-dihydroxyvitamin D-3[1,25(OH)(2)D-3(C)] induces leukemic cells, including HL-60, to differentiate and/or no longer proliferate, but it causes hypercalcemia. Development of vitamin D analogs that are more potent in their abilities to affect leukemic cells without causing greater hypercalcemia, may be useful therapeutically. A novel analog [1,25(OH)(2)-16ene-D-3(HM)] has a double bond between C-16 and C-17; it appears to be an extremely effective antileukemic agent with the same or fewer effects on serum calciums. We define the potency of this compound and compare it with seven, previously reported, potent analogs of 1,25(OH)(2)D-3. HM inhibited clonal growth of HL-60 cells by 50% at 1.5 x 10(-11) M. This was about equipotent to 1,25(OH)(2)-16ene-23yne-D-3(V), about 100-fold more potent than many of the other analogs, and 1000-fold more potent than 1,25(OH)(2)D-3. The rank order of leukemic inhibitory activity was: 1,25(OH)(2)-16ene-D-3(HM) greater than or equal to 1,25(OH)(2)-16ene-23yne-D-3(V) > 1,25(OH)(2)-23ene-D-3(EX) = 1,24(OH)(2)-22ene-24-cyclopropyl-D-3(BT) = 22-oxa-1,25(OH)(2)D-3(EU) = 1,25(OH)(2)-24-homo-D-3(ER) > 1,25(OH)(2)D-3(C) > 1,25(OH)(2)-24-dihomo-D-3(ES). The rank order of their effects on induction of differentiation of HL-60 cells, as measured by superoxide production and nonspecific esterase activity, was similar to their antiproliferative activities. In contrast, each analog slightly stimulated proliferation of normal human myeloid clonal growth. Serum calcium levels were the same or slightly less when either 1,25(OH)(2)-16ene-D-3(HM) or 1,25(OH)(2)D-3 (0.0625, 0.125, or 0.25 mu g) was given intraperitoneally to mice for 5 weeks. HM bound to 1,25(OH)(2)D-3 receptors about 1.5-fold more avidly than 1,25(OH)(2)D-3. In fact, this vitamin D-3 appears to be the most avid binder to 1,25(OH)(2)D-3 receptors that has been identified to date. In contrast, HM had a greater than 50-fold lower affinity for the D-binding proteins as corn pared with 1,25(OH)(2)D-3, thus increasing the availability of the compound for target tissues. Further differentiation experiments showed that HM was more potent than 1,25(OH)(2)D-3 in the presence of serum, but was equipotent in serum-free conditions. Taken together, our experiments suggest that 1,25(OH)(2)-16ene-D-3(HM) may be more potent than 1,25(OH)(2)D-3(C) because of its higher affinity to the 1,25(OH)(2)D-3 receptors and its low affinity to the D-binding proteins present in serum. HM is an ideal compound for clinical studies including patients with preleukemia and other neoplasia, as well as several skin disorders, such as psoriasis.