Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Tyrosine Kinase ALK/LTK Inhibitors Target B Lymphocytes

Version 1 : Received: 23 February 2023 / Approved: 24 February 2023 / Online: 24 February 2023 (09:11:37 CET)

How to cite: Oksenych, V. Tyrosine Kinase ALK/LTK Inhibitors Target B Lymphocytes. Preprints 2023, 2023020423. Oksenych, V. Tyrosine Kinase ALK/LTK Inhibitors Target B Lymphocytes. Preprints 2023, 2023020423.


Autoimmune disorders and some types of blood cancer originate when B lymphocytes malfunction. In particular, when B cells produce antibodies recognizing the body’s proteins, it leads to various autoimmune disorders. And when B cells of various developmental stages transform into cancer cells, it results in blood cancers, including multiple myeloma, lymphoma, and leukemia. Thus, new methods of targeting B cells are required for various patient groups. Here, we used protein kinase inhibitors alectinib, brigatinib, ceritinib, crizotinib, entrectinib, and lorlatinib previously approved as drugs treating anaplastic lymphoma kinase (ALK)-positive lung cancer cells. We hypothesized that the same inhibitors will efficiently target leukocyte tyrosine kinase (LTK)-positive, actively protein-secreting mature B lymphocytes, including plasma cells. We isolated CD19-positive human B cells from the blood of healthy donors and used two alternative methods to stimulate cell maturation toward plasma cells. Using cell proliferation and flow cytometry assays, we found that ceritinib and entrectinib eliminate plasma cells from B cell populations. Alectinib, brigatinib, and crizotinib also inhibited B cell proliferation, while lorlatinib had no or limited effect on B cells. More generally, we concluded that several drugs previously developed to treat ALK-positive malignant cells can be also used to treat LTK-positive B cells.


B-cell; autoimmune disease; drug repurposing


Biology and Life Sciences, Immunology and Microbiology

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