AGC Kinases and Cancer

A special issue of Cancers (ISSN 2072-6694).

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 16376

Special Issue Editor


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Guest Editor
Department of Microbiology, Immunology & Genetics, University of North Texas Health Science Center, Fort Worth, TX, USA
Interests: signal transduction; Akt; protein kinase C; mechanistic target of rapamycin/S6 kinase; apoptosis; autophagy; senescence; breast cancer
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

AGC kinases are a group of related Ser/Thr protein kinases that acquired the acronym because of the structural similarities with protein kinase A, protein kinase G and protein kinase C at their catalytic domains. There are at least sixty members in the AGC kinase family, including Akt, 3-phosphoinositide-dependent kinase 1 (PDK1), protein kinase C (PKC), S6 kinase (S6K), serum- and glucocorticoid-induced protein kinase (SGK) and Rho-associated coiled-coil containing kinase (ROCK). AGC kinases play important roles in signal transduction and cell regulation. An aberration in several members of the AGC kinase family has been associated with cancer. Many of these AGC kinases exist as several different isoforms that exhibit distinct functions. Proper targeting of AGC kinases for cancer therapy requires a thorough understanding of the structure, function and regulation of different isoforms of a particular AGC kinase and the molecular mechanisms by which they contribute to cancer.  This Special Issue focuses on the involvement of AGC kinases, especially the function of individual isoforms of a particular AGC kinase, in cancer and as potential targets for cancer therapy.

Prof. Dr. Alakananda Basu
Guest Editor

Manuscript Submission Information

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Keywords

  • Akt/PKB
  • PDK1
  • PKC
  • RSK
  • S6K
  • SGK
  • ROCK

Published Papers (4 papers)

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Research

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11 pages, 1043 KiB  
Article
Discovery of a Potent and Highly Isoform-Selective Inhibitor of the Neglected Ribosomal Protein S6 Kinase Beta 2 (S6K2)
by Stefan Gerstenecker, Lisa Haarer, Martin Schröder, Mark Kudolo, Martin P. Schwalm, Valentin Wydra, Ricardo A. M. Serafim, Apirat Chaikuad, Stefan Knapp, Stefan Laufer and Matthias Gehringer
Cancers 2021, 13(20), 5133; https://doi.org/10.3390/cancers13205133 - 13 Oct 2021
Cited by 6 | Viewed by 3255
Abstract
The ribosomal protein S6 kinase beta 2 (S6K2) is thought to play an important role in malignant cell proliferation, but is understudied compared to its closely related homolog S6 kinase beta 1 (S6K1). To better understand the biological function of S6K2, chemical probes [...] Read more.
The ribosomal protein S6 kinase beta 2 (S6K2) is thought to play an important role in malignant cell proliferation, but is understudied compared to its closely related homolog S6 kinase beta 1 (S6K1). To better understand the biological function of S6K2, chemical probes are needed, but the high similarity between S6K2 and S6K1 makes it challenging to selectively address S6K2 with small molecules. We were able to design the first potent and highly isoform-specific S6K2 inhibitor from a known S6K1-selective inhibitor, which was merged with a covalent inhibitor engaging a cysteine located in the hinge region in the fibroblast growth factor receptor kinase (FGFR) 4 via a nucleophilic aromatic substitution (SNAr) reaction. The title compound shows a high selectivity over kinases with an equivalently positioned cysteine, as well as in a larger kinase panel. A good stability towards glutathione and Nα-acetyl lysine indicates a non-promiscuous reactivity pattern. Thus, the title compound represents an important step towards a high-quality chemical probe to study S6K2-specific signaling. Full article
(This article belongs to the Special Issue AGC Kinases and Cancer)
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Review

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16 pages, 4091 KiB  
Review
Targeting Protein Kinase C for Cancer Therapy
by Sijia He, Qi Li, Qian Huang and Jin Cheng
Cancers 2022, 14(5), 1104; https://doi.org/10.3390/cancers14051104 - 22 Feb 2022
Cited by 24 | Viewed by 3947
Abstract
Protein kinase C (PKC) isoforms, a group of serine-threonine kinases, are important regulators in carcinogenesis. Numerous studies have demonstrated that PKC isoforms exert both positive and negative effects on cancer cell demise. In this review, we systematically summarize the current findings on the [...] Read more.
Protein kinase C (PKC) isoforms, a group of serine-threonine kinases, are important regulators in carcinogenesis. Numerous studies have demonstrated that PKC isoforms exert both positive and negative effects on cancer cell demise. In this review, we systematically summarize the current findings on the architecture, activity regulation and biological functions of PKCs, especially their relationship with anti-cancer therapy-induced cell death. Additionally, we elaborate on current knowledge of the effects of PKCs on tumor metabolism and microenvironment, which have gained increasing attention in oncology-related areas. Furthermore, we underscore the basic experimental and clinical implications of PKCs as a target for cancer therapy to evaluate their therapeutic benefits and potential applications. Full article
(This article belongs to the Special Issue AGC Kinases and Cancer)
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17 pages, 2880 KiB  
Review
The Landscape of PDK1 in Breast Cancer
by Na Wang, Jianjiang Fu, Zhihua Li, Ningni Jiang, Yanhong Chen and Juan Peng
Cancers 2022, 14(3), 811; https://doi.org/10.3390/cancers14030811 - 05 Feb 2022
Cited by 13 | Viewed by 3055
Abstract
Given that 3-phosphoinositide-dependent kinase 1 (PDK1) plays a crucial role in the malignant biological behaviors of a wide range of cancers, we review the influence of PDK1 in breast cancer (BC). First, we describe the power of PDK1 in cellular behaviors and characterize [...] Read more.
Given that 3-phosphoinositide-dependent kinase 1 (PDK1) plays a crucial role in the malignant biological behaviors of a wide range of cancers, we review the influence of PDK1 in breast cancer (BC). First, we describe the power of PDK1 in cellular behaviors and characterize the interaction networks of PDK1. Then, we establish the roles of PDK1 in carcinogenesis, growth and survival, metastasis, and chemoresistance in BC cells. More importantly, we sort the current preclinical or clinical trials of PDK1-targeted therapy in BC and find that, even though no selective PDK1 inhibitor is currently available for BC therapy, the combination trials of PDK1-targeted therapy and other agents have provided some benefit. Thus, there is increasing anticipation that PDK1-targeted therapy will have its space in future therapeutic approaches related to BC, and we hope the novel approaches of targeted therapy will be conducive to ameliorating the dismal prognosis of BC patients. Full article
(This article belongs to the Special Issue AGC Kinases and Cancer)
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23 pages, 761 KiB  
Review
Akt Isoforms: A Family Affair in Breast Cancer
by Alakananda Basu and Christoffer Briggs Lambring
Cancers 2021, 13(14), 3445; https://doi.org/10.3390/cancers13143445 - 09 Jul 2021
Cited by 27 | Viewed by 5032
Abstract
Akt, also known as protein kinase B (PKB), belongs to the AGC family of protein kinases. It acts downstream of the phosphatidylinositol 3-kinase (PI3K) and regulates diverse cellular processes, including cell proliferation, cell survival, metabolism, tumor growth and metastasis. The PI3K/Akt signaling pathway [...] Read more.
Akt, also known as protein kinase B (PKB), belongs to the AGC family of protein kinases. It acts downstream of the phosphatidylinositol 3-kinase (PI3K) and regulates diverse cellular processes, including cell proliferation, cell survival, metabolism, tumor growth and metastasis. The PI3K/Akt signaling pathway is frequently deregulated in breast cancer and plays an important role in the development and progression of breast cancer. There are three closely related members in the Akt family, namely Akt1(PKBα), Akt2(PKBβ) and Akt3(PKBγ). Although Akt isoforms share similar structures, they exhibit redundant, distinct as well as opposite functions. While the Akt signaling pathway is an important target for cancer therapy, an understanding of the isoform-specific function of Akt is critical to effectively target this pathway. However, our perception regarding how Akt isoforms contribute to the genesis and progression of breast cancer changes as we gain new knowledge. The purpose of this review article is to analyze current literatures on distinct functions of Akt isoforms in breast cancer. Full article
(This article belongs to the Special Issue AGC Kinases and Cancer)
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