Role of JNK and Contribution of p53 into Growth Potential of Mesenchymal Progenitor Cells In Vitro

Antitumor Effects of JAK3 Inhibitor on the Model of Transplantable Lewis Lung Carcinoma and Mechanisms of Their Development

Mice with Lewis lung carcinoma were used to study the antitumor and antimetastatic effects of JAK3 inhibitor. The study revealed no effect of JAK3 inhibitor on the growth of primary tumor node, but found a pronounced inhibition of hematogenous spread of the pathologic process into the lungs. In vitro blockade of JAK3 in cultured Lewis lung carcinoma produced no effect on the count of the stem tumor cells and stimulated functions of committed elements. In addition, blockade of JAK3 significantly elevated maturation index of the tumor tissue.

Role of JNK and Involvement of p53 in Stimulation of Growth Potential Realization of Mesenchymal Precursor Cells by Alkaloid Songorine

The role of JNK-mediated signal pathway and participation of p53 transcription factor in stimulation of realization of the growth potential of the mesenchymal precursor cells by alkaloid songorine were examined in vitro. Specific inhibitors of JNK and p53 enhanced stimulation of fibroblast colony/cluster formation and proliferative activity of mesenchymal precursor cells. Under these conditions, more pronounced effects were observed with early precursors of fibroblast CFU and in both cases were accompanied by a decrease in differentiation index of progenitor elements.