• Study process
A team of two authors searched the keywords mentioned in the method in web of science, PubMed and Scopus databases respectively. A total of 1580 studies were obtained from all three databases. Both of them removed the comments from the congress, Review, letter to the editor. 867 studies remained, which this two-person team screened titles and abstracts, and non-English and non-free studies that were unstructured or contained incomplete information about the method. they also removed similar titles. 391 studies were left and we studied their summary, the criterion for removing articles at this stage was the basic criteria in our research question, of which 148 studies had the necessary eligibility. Aa well as the studies that investigated the interaction of drugs on the inhibitors were excluded. 26 studies remained and their full text was studied. After a complete study, 20 articles were given to the first and co-authors, and after checking the risk of bias by RoB 2 for in vivo and ex vivo, 17 studies were considered for conclusion (Diagram 1).
All the studies included the culture of human cells in vitro and then evaluation and verification in vivo. Only one clinical study was conducted(17), which due to the lack of free access and of course the lack of cooperation of the responsible author, it is possible to measure the risk of complete bias. It was not, so it was removed.
Treatment based on this inhibition of the JAK/STAT pathway in myeloid leukemias is a more likely choice than the lymphoid type. 41% of our available studies investigated this type of treatment in AML (Acute myeloid leukemia) and 29% in CML (Chronic myeloid leukemia), and the rest of the studies were Lymphoid leukemias arrived( supplementary 1 ).
Figure 1 has categorized the inhibitors of each type of leukemia, based on our studies, some drugs have the ability to limit the JAK/STAT pathway in each type of leukemia. Roxilitinib is a good example of a broad-spectrum drug in leukemia that is both a STAT and JAK inhibitor. On the other hand, some drugs were mentioned only in AML by the articles, which we can mention Ritanserin and Anlotinib, which were used more specifically for acute lymphoid leukemia.Similarities in CML and AML inhibitors can be observed in studies, and it is possible to limit the JAK/STAT pathway in both types with Fedratinib and Thymoquinone, if these similarities are not observed between ALL(Acute lymphoblastic leukemia) and CLL(Chronic lymphoblastic leukemia).
What was evident in our available studies, JAK/STAT inhibitors have the ability to limit the progress of malignant cells in leukemia, the diversity of these inhibitors gives us a suitable choice for each type of leukemia specifically.
Figure 2 shows in detail the target pathway of each of the obtained inhibitors.
Types of T cells in the course of ALL that have become malignant are called Early T-cell precursor and T-ALL, which show high levels of phosphorylated STAT 1, STAT 3 and STAT 5 in the course of ALL. they give. As a cytokine secreted by many cells, especially T cells, IL-17 activates the signaling pathways of T cells, including ETP-ALL((Early T cell Progenitor Acute Lymphoblastic Leukemia) and T-ALL (13, 18), after the expression of this cytokine, the level of JAK-STAT5 pathway is phosphorylated. PI3K-AKT-mTOR and MEKERK are increased in T-ALL of the phosphorylated STAT 5 pathway in ETP-ALL. Treatment of ALL cells from affected children with BEZ-235 and ruxolitinib inhibits this increase in the phosphorylated level of STAT 5 and prevents the growth of ALL cells and their further differentiation. Also, ruxolitinib as a JAK inhibitor reduced the phosphorylated level of STATs 1, 3 and 5 in mice.
The involvement of cytokines in AML is also evident, pro-inflammatory cytokines such as IL-8, IL-1β, IL-6, and IL-10 in AML with increased signaling and expression of STAT3, STAT5 pathways, as well as JAK 1 and 2 kinases in the cell. is the primary leukemia(19), also IL-1β increases the expression of JAK 2 in these cells, ruxolitinib and fedratinib(20, 21), as well as specialized JAK inhibitors such as solcitinib (JAK2), momelotinib (JAK1/2), and tofacitinib (JAK3), phosphorylate the STAT pathway They inhibit them in bone marrow cells and also control and reduce JAK 2 signaling level in bone marrow stem cells of leukemia patients.
Cheng-Jin Ai observed in his measurement that IL-6 activates the JAK1/STAT3 pathway and not p-JAK1, p-STAT3, that Gossypol acetic acid inhibits the effect of IL-6 on the JAK1/STAT3 pathway(22). It neutralizes the self-renewal of leukemia cells. This was in contrast to the phosphorylation pathway that was inhibited by Ruxolitinib. Contrary to this study, ritanserin reduces the brightness of phosphorylated JAK1, JAK3, STAT3, STAT5, MEK1/2 in Kasumi-1 and KG-1α cells(23), it is worth mentioning in this study that the reduction of apoptosis of AML cells and the increase of JAK1 and the level of unphosphorylated STAT3, STAT5 in combination with RO8191. This compound is considered an interferon agonist that induces phosphorylated STAT 1, 3, 5 and 6 pathways as a pro-inflammatory factor. In fact, in the combination treatment of ritanserin with RO8191, in addition to reducing the ability of ritanserin to limit JAK/STAT, other signaling pathways will intensify in the development of malignancy. sodium metaarsenite (KML001) and anlotinib decrease the level of phosphorylated STAT1, STAT3 and STAT5 in Leukemia stem cells (LSCs) (14, 21).
Al-Rawashde showed in comprehensive research that Thymoquinone, as a high penetration inhibitor in leukemia, has the ability to limit STAT3, STAT5a, and STAT5b(24). In this research, JAK2 was severely decreased in MV4-11 cells, this group of cells in bone marrow affected by leukemia is considered as a marker of myeloid leukemia. What is noteworthy is that Thymoquinone also reduced the non-phosphorylated level of these pathways, although it should be noted that this inhibitor can also be used in CML.
Thymoquinone increases the apoptosis of CML cells and limits the growth of damaged cells, also this time in K562 cells it reduces the levels of STAT 3 and 5 in addition to JAK 2(24). The difference in the function of this inhibitor is in the target cell in AML and CML, which, of course, K562 cells are the target cells of other inhibitors such as Imatinib, Fedratinib and Dehydrocostus lactone to limit JAK 2(25, 26).
Fedratinib limits the proliferation of K562 cells and shows a noticeable decrease in the level of phosphorylated STAT 5(27). These types of cells are recognized as the first cell line in CLL and thus have a diagnostic value for this type of leukemia, which of course are enhanced with HS-5 stem cells. The presence of HS-5 in the culture medium of K562 does not allow the treatment with Fedratinib and imatinib, as inhibition of STAT and kinases in the presence of this type of stem cells cannot be done by inhibitors. This topic alone has the potential for further research that restricting some stem cells in one of the sources of stem cells, namely the bone marrow, may be able to prevent the growth of malignant cells. Dehydrocostus lactone decreases both p-STAT3, p-STAT5 and p-JAK2 levels in K562 cells, since JAK 2 is considered an important signaling pathway in bone marrow cells in CML(25), an important therapeutic pathway will form by Dehydrocostus lactone.
The combination of several inhibitors gives the ability to cover more signaling pathways than monotherapy, the combination of ruxolitinib and nilotinib(28), in addition to reducing the level of p-STAT5 and JAK2, also controls and limits the transplantable leukemogenic activity of CML CD34+. Imatinib alone was able to limit phosphorylation of JAK2, JAK3, and STAT3, but combination with JAK inhibitors such as ruxolitinib and tofacitinib provides a treatment that does not affect JAK2/3, or STAT3/5 phosphorylation(26, 29).
By activating the signaling pathway, pro-inflammatory cytokines reduce the body's natural apoptosis for malignant cells and increase survival in tuberculosis. IL-4 and IL-6 elevate the expression of STAT3 or STAT6 pathways(19), CLL enables the growth and differentiation of leukemic cells, and cerdulatinib inhibits the phosphorylation of JAK1, JAK3 and STAT6 in the IL-4 pathway and JAK1, JAK2 and STAT3 in the IL-6 pathway, and induce cell apoptosis(30). Ailin Guo was able to prevent the proliferation of leukemia cells that showed resistance to ibrutinib with cerdulatinib, this point will be important from the point of view that the inhibitors will not transfer resistance. If several inhibitors are used as multitherapy, or if there is no response to monotherapy and another inhibitor is selected, a complete response can be expected from the treatment. As we see an increase in CLL cell death rate up to 50% in the combination of ibrutinib and AG490, choosing combined treatments will be preferable over monotherapies(31).