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p21-Activated kinases as promising therapeutic targets in hematological malignancies

Abstract

The p21-Activated Kinases (PAKs) are a family of six serine/threonine kinases that were originally identified as downstream effectors of the Rho GTPases Cdc42 and Rac. Since the first PAK was discovered in 1994, studies have revealed their fundamental and biological importance in the development of physiological systems. Within the cell, PAKs also play significant roles in regulating essential cellular processes such as cytoskeletal dynamics, gene expression, cell survival, and cell cycle progression. These processes are often deregulated in numerous cancers when different PAKs are overexpressed or amplified at the chromosomal level. Furthermore, PAKs modulate multiple oncogenic signaling pathways which facilitate apoptosis escape, uncontrolled proliferation, and drug resistance. There is growing insight into the critical roles of PAKs in regulating steady-state hematopoiesis, including the properties of hematopoietic stem cells (HSC), and the initiation and progression of hematological malignancies. This review will focus on the most recent studies that provide experimental evidence showing how specific PAKs regulate the properties of leukemic stem cells (LSCs) and drug-resistant cells to initiate and maintain hematological malignancies. The current understanding of the molecular and cellular mechanisms by which the PAKs operate in specific human leukemia or lymphomas will be discussed. From a translational point of view, PAKs have been suggested to be critical therapeutic targets and potential prognosis markers; thus, this review will also discuss current therapeutic strategies against hematological malignancies using existing small-molecule PAK inhibitors, as well as promising combination treatments, to sensitize drug-resistant cells to conventional therapies. The challenges of toxicity and non-specific targeting associated with some PAK inhibitors, as well as how future approaches for PAK inhibition to overcome these limitations, will also be addressed.

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Fig. 1: Group I and Group II p21-Activated Kinase Structure and Mechanisms of Activation.
Fig. 2: Role of PAK Kinases in Hematological Malignancies.
Fig. 3: Structures of PAK Small Molecule Inhibitors Commonly Used Against Hematological Malignancies.

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Acknowledgements

XJ is generously supported by the Canadian Institutes of Health Research (CIHR), the Canadian Cancer Society, and the Leukemia & Lymphoma Society of Canada. AW received a MITACS Accelerate Fellowship. We also acknowledge many colleagues whose relevant research we were not able to cite due to space limitations.

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AW reviewed the literature and wrote the manuscript and XJ edited the manuscript.

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Correspondence to Xiaoyan Jiang.

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Wu, A., Jiang, X. p21-Activated kinases as promising therapeutic targets in hematological malignancies. Leukemia 36, 315–326 (2022). https://doi.org/10.1038/s41375-021-01451-7

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