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Yusuke Tarumoto, Bin Lu, Tim D D Somerville, Yu-Han Huang, Joseph P Milazzo, Xiaoli S Wu, Olaf Klingbeil, Osama El Demerdash, Junwei Shi, Christopher R Vakoc
The lineage-specific transcription factor (TF) MEF2C is often deregulated in leukemia. However, strategies to target this TF have yet to be identified. Here, we used a domain-focused CRISPR screen to reveal an essential role for LKB1 and its Salt-Inducible Kinase effectors (SIK3, in a partially redundant manner with SIK2) to maintain MEF2C function in acute myeloid leukemia (AML). A key phosphorylation substrate of SIK3 in this context is HDAC4, a repressive cofactor of MEF2C. Consequently, targeting of LKB1 or SIK3 diminishes histone acetylation at MEF2C-bound enhancers and deprives leukemia cells of the output of this essential TF...
February 28, 2018: Molecular Cell
#2
Wei-Wei Gao, Hei-Man Vincent Tang, Yun Cheng, Ching-Ping Chan, Chi-Ping Chan, Dong-Yan Jin
CRTCs are a group of three transcriptional coactivators required for CREB-dependent transcription. CREB and CRTCs are critically involved in the regulation of various biological processes such as cell proliferation, metabolism, learning and memory. However, whether CRTC1 efficiently induces gluconeogenic gene expression and how CRTC1 is regulated by upstream kinase SIK1 remain to be understood. In this work, we demonstrated SIK1-induced phosphorylation, ubiquitination and degradation of CRTC1 in the context of the regulation of gluconeogenesis...
January 30, 2018: Biochimica et Biophysica Acta
#3
Marion Tanguy, Sophie Gauthier-Clerc, Jocelyne Pellerin, Jean-Michel Danger, Ahmed Siah
The marine mussel Mytilus edulis, tolerant to a wide range of environmental changes, combines a key role as a sentinel species for environmental monitoring programs and a significant economic importance. Mortality events caused by infective agents and parasites have not been described in mussels, which suggests an efficient immune system. This study aims at identifying the molecular mechanisms involved in the early immune responses M. edulis' hemocytes challenged with Vibrio splendidus LGP32 strain during 2, 4 and 6 h...
March 2018: Fish & Shellfish Immunology
#4
EDITORIAL
Tim Sonntag, Joan M Vaughan, Marc Montminy
The salt-inducible kinase (SIK) family regulates cellular gene expression via the phosphorylation of cAMP-regulated transcriptional coactivators (CRTCs) and class IIA histone deacetylases, which are sequestered in the cytoplasm by phosphorylation-dependent 14-3-3 interactions. SIK activity toward these substrates is inhibited by increases in cAMP signaling, although the underlying mechanism is unclear. Here, we show that the protein kinase A (PKA)-dependent phosphorylation of SIKs inhibits their catalytic activity by inducing 14-3-3 protein binding...
February 2018: FEBS Journal
#5
Susan Klaeger, Stephanie Heinzlmeir, Mathias Wilhelm, Harald Polzer, Binje Vick, Paul-Albert Koenig, Maria Reinecke, Benjamin Ruprecht, Svenja Petzoldt, Chen Meng, Jana Zecha, Katrin Reiter, Huichao Qiao, Dominic Helm, Heiner Koch, Melanie Schoof, Giulia Canevari, Elena Casale, Stefania Re Depaolini, Annette Feuchtinger, Zhixiang Wu, Tobias Schmidt, Lars Rueckert, Wilhelm Becker, Jan Huenges, Anne-Kathrin Garz, Bjoern-Oliver Gohlke, Daniel Paul Zolg, Gian Kayser, Tonu Vooder, Robert Preissner, Hannes Hahne, Neeme Tõnisson, Karl Kramer, Katharina Götze, Florian Bassermann, Judith Schlegl, Hans-Christian Ehrlich, Stephan Aiche, Axel Walch, Philipp A Greif, Sabine Schneider, Eduard Rudolf Felder, Juergen Ruland, Guillaume Médard, Irmela Jeremias, Karsten Spiekermann, Bernhard Kuster
Kinase inhibitors are important cancer therapeutics. Polypharmacology is commonly observed, requiring thorough target deconvolution to understand drug mechanism of action. Using chemical proteomics, we analyzed the target spectrum of 243 clinically evaluated kinase drugs. The data revealed previously unknown targets for established drugs, offered a perspective on the "druggable" kinome, highlighted (non)kinase off-targets, and suggested potential therapeutic applications. Integration of phosphoproteomic data refined drug-affected pathways, identified response markers, and strengthened rationale for combination treatments...
December 1, 2017: Science
#6
Maria Stella Lombardi, Corine Gilliéron, Majoska Berkelaar, Cem Gabay
Osteoclasts are large multinucleated cells responsible for bone resorption. Excessive inflammatory activation of osteoclasts leads to bony erosions, which are the hallmark of several diseases such as rheumatoid arthritis (RA). Salt-inducible kinases (SIK) constitute a subfamily of kinases comprising three members (SIK1, -2, and -3). Inhibition of SIK kinase activity induces an anti-inflammatory phenotype in macrophages. Since osteoclasts originate from precursors of macrophage origin, we hypothesized a role of SIK in osteoclastogenesis...
2017: PloS One
#7
Linda M Parsons, Nicola A Grzeschik, Kasun Amaratunga, Peter Burke, Leonie M Quinn, Helena E Richardson
In both Drosophila melanogaster and mammalian systems, epithelial structure and underlying cell polarity are essential for proper tissue morphogenesis and organ growth. Cell polarity interfaces with multiple cellular processes that are regulated by the phosphorylation status of large protein networks. To gain insight into the molecular mechanisms that coordinate cell polarity with tissue growth, we screened a boutique collection of RNAi stocks targeting the kinome for their capacity to modify Drosophila "cell polarity" eye and wing phenotypes...
August 7, 2017: G3: Genes—Genomes—Genetics
#8
Yusuke Nakatsu, Keiichi Mori, Yasuka Matsunaga, Takeshi Yamamotoya, Koji Ueda, Yuki Inoue, Keiko Mitsuzaki-Miyoshi, Hideyuki Sakoda, Midori Fujishiro, Suguru Yamaguchi, Akifumi Kushiyama, Hiraku Ono, Hisamitsu Ishihara, Tomoichiro Asano
The prolyl isomerase Pin1 binds to the phosphorylated Ser/Thr-Pro motif of target proteins and enhances their cis-trans conversion. This report is the first to show that Pin1 expression in pancreatic β cells is markedly elevated by high-fat diet feeding and in ob/ob mice. To elucidate the role of Pin1 in pancreatic β cells, we generated β-cell-specific Pin1 KO (βPin1 KO) mice. These mutant mice showed exacerbation of glucose intolerance but had normal insulin sensitivity. We identified two independent factors underlying impaired insulin secretion in the βPin1 KO mice...
July 14, 2017: Journal of Biological Chemistry
#9
EDITORIAL
Chao-Nan Qian, Yan Mei, Jian Zhang
Metastasis is the major cause of treatment failure in cancer patients and of cancer-related deaths. This editorial discusses how cancer metastasis may be better perceived and controlled. Based on big-data analyses, a collection of 150 important pro-metastatic genes was studied. Using The Cancer Genome Atlas datasets to re-analyze the effect of some previously reported metastatic genes-e.g., JAM2, PPARGC1A, SIK2, and TRAF6-on overall survival of patients with renal and liver cancers, we found that these genes are actually protective factors for patients with cancer...
April 3, 2017: Chinese Journal of Cancer
#10
Nicola J Darling, Rachel Toth, J Simon C Arthur, Kristopher Clark
The salt-inducible kinases (SIKs) control a novel molecular switch regulating macrophage polarization. Pharmacological inhibition of the SIKs induces a macrophage phenotype characterized by the secretion of high levels of anti-inflammatory cytokines, including interleukin (IL)-10, and the secretion of very low levels of pro-inflammatory cytokines, such as tumour necrosis factor α. The SIKs, therefore, represent attractive new drug targets for the treatment of macrophage-driven diseases, but which of the three isoforms, SIK1, SIK2 or SIK3, would be appropriate to target remains unknown...
February 15, 2017: Biochemical Journal
#11
Johanna Säll, Annie M L Pettersson, Christel Björk, Emma Henriksson, Sebastian Wasserstrom, Wilhelm Linder, Yuedan Zhou, Ola Hansson, Daniel P Andersson, Mikael Ekelund, Eva Degerman, Karin G Stenkula, Jurga Laurencikiene, Olga Göransson
AIMS/HYPOTHESIS: Salt-inducible kinases (SIKs) are related to the metabolic regulator AMP-activated protein kinase (AMPK). SIK2 is abundant in adipose tissue. The aims of this study were to investigate the expression of SIKs in relation to human obesity and insulin resistance, and to evaluate whether changes in the expression of SIKs might play a causal role in the development of disturbed glucose uptake in human adipocytes. METHODS: SIK mRNA and protein was determined in human adipose tissue or adipocytes, and correlated to clinical variables...
February 2017: Diabetologia
#12
Marc N Wein, Yanke Liang, Olga Goransson, Thomas B Sundberg, Jinhua Wang, Elizabeth A Williams, Maureen J O'Meara, Nicolas Govea, Belinda Beqo, Shigeki Nishimori, Kenichi Nagano, Daniel J Brooks, Janaina S Martins, Braden Corbin, Anthony Anselmo, Ruslan Sadreyev, Joy Y Wu, Kei Sakamoto, Marc Foretz, Ramnik J Xavier, Roland Baron, Mary L Bouxsein, Thomas J Gardella, Paola Divieti-Pajevic, Nathanael S Gray, Henry M Kronenberg
Parathyroid hormone (PTH) activates receptors on osteocytes to orchestrate bone formation and resorption. Here we show that PTH inhibition of SOST (sclerostin), a WNT antagonist, requires HDAC4 and HDAC5, whereas PTH stimulation of RANKL, a stimulator of bone resorption, requires CRTC2. Salt inducible kinases (SIKs) control subcellular localization of HDAC4/5 and CRTC2. PTH regulates both HDAC4/5 and CRTC2 localization via phosphorylation and inhibition of SIK2. Like PTH, new small molecule SIK inhibitors cause decreased phosphorylation and increased nuclear translocation of HDAC4/5 and CRTC2...
October 19, 2016: Nature Communications
#13
Kimberly E Maxfield, Jennifer Macion, Hariprasad Vankayalapati, Angelique W Whitehurst
Triple-negative breast cancer (TNBC) is a highly heterogeneous disease with multiple, distinct molecular subtypes that exhibit unique transcriptional programs and clinical progression trajectories. Despite knowledge of the molecular heterogeneity of the disease, most patients are limited to generic, indiscriminate treatment options: cytotoxic chemotherapy, surgery, and radiation. To identify new intervention targets in TNBC, we used large-scale, loss-of-function screening to identify molecular vulnerabilities among different oncogenomic backgrounds...
December 15, 2016: Molecular and Cellular Biology
#14
Jinhua Zhou, Albandri Alfraidi, Shu Zhang, Janice M Santiago-O'Farrill, Venkata Krishna Yerramreddy Reddy, Abdulkhaliq Alsaadi, Ahmed A Ahmed, Hailing Yang, Jinsong Liu, Weiqun Mao, Yan Wang, Hiroshi Takemori, Hariprasad Vankayalapati, Zhen Lu, Robert C Bast
Purpose: Salt-inducible kinase 2 (SIK2) is a centrosome kinase required for mitotic spindle formation and a potential target for ovarian cancer therapy. Here, we examine the effects of a novel small-molecule SIK2 inhibitor, ARN-3236, on sensitivity to paclitaxel in ovarian cancer.Experimental Design: SIK2 expression was determined in ovarian cancer tissue samples and cell lines. ARN-3236 was tested for its efficiency to inhibit growth and enhance paclitaxel sensitivity in cultures and xenografts of ovarian cancer cell lines...
April 15, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
#15
REVIEW
Jacob A Galan, Joseph Avruch
The MST1 and MST2 protein kinases comprise the GCK-II subfamily of protein kinases. In addition to their amino-terminal kinase catalytic domain, related to that of the Saccharomyces cerevisiae protein kinase Ste20, their most characteristic feature is the presence near the carboxy terminus of a unique helical structure called a SARAH domain; this segment allows MST1/MST2 to homodimerize and to heterodimerize with the other polypeptides that contain SARAH domains, the noncatalytic polypeptides RASSF1-6 and Sav1/WW45...
October 4, 2016: Biochemistry
#16
(no author information available yet)
A recent study reveals that the kinase SIK2 helps ovarian cancer cells metastasize and establish themselves in the fat-rich tissues of the abdominal cavity by promoting fatty-acid metabolism and cell proliferation. Mice bearing SIK2-overexpressing human ovarian cancer cells had larger, more abundant metastases than those whose tumors bore an inactive form of the kinase.
October 2016: Cancer Discovery
#17
REVIEW
Jinwoo Lee, Takeshi Yamazaki, Hui Dong, Colin Jefcoate
The Steroidogenic acute regulatory protein (StAR) directs mitochondrial cholesterol uptake through a C-terminal cholesterol binding domain (CBD) and a 62 amino acid N-terminal regulatory domain (NTD) that contains an import sequence and conserved sites for inner membrane metalloproteases. Deletion of the NTD prevents mitochondrial import while maintaining steroidogenesis but with compromised cholesterol homeostasis. The rapid StAR-mediated cholesterol transfer in adrenal cells depends on concerted mRNA translation, p37 StAR phosphorylation and controlled NTD cleavage...
February 5, 2017: Molecular and Cellular Endocrinology
#18
Fabrizio Miranda, David Mannion, Shujuan Liu, Yiyan Zheng, Lingegowda S Mangala, Clara Redondo, Sandra Herrero-Gonzalez, Ruoyan Xu, Charlotte Taylor, Donatien Fotso Chedom, Mohammad Karaminejadranjbar, Ashwag Albukhari, Dahai Jiang, Sunila Pradeep, Cristian Rodriguez-Aguayo, Gabriel Lopez-Berestein, Eidarus Salah, Kamal R Abdul Azeez, Jonathan M Elkins, Leticia Campo, Kevin A Myers, Daniel Klotz, Serena Bivona, Sunanda Dhar, Robert C Bast, Hideyuki Saya, Hwan Geun Choi, Nathanael S Gray, Roman Fischer, Benedikt M Kessler, Christopher Yau, Anil K Sood, Takeshi Motohara, Stefan Knapp, Ahmed Ashour Ahmed
The adipocyte-rich microenvironment forms a niche for ovarian cancer metastasis, but the mechanisms driving this process are incompletely understood. Here we show that salt-inducible kinase 2 (SIK2) is overexpressed in adipocyte-rich metastatic deposits compared with ovarian primary lesions. Overexpression of SIK2 in ovarian cancer cells promotes abdominal metastasis while SIK2 depletion prevents metastasis in vivo. Importantly, adipocytes induce calcium-dependent activation and autophosphorylation of SIK2...
August 8, 2016: Cancer Cell
#19
H-H Wang, C-Y Lin, S-H Su, C-T Chuang, Y-L Chang, T-Y Lee, S-C Lee, C-J Chang
Maintaining mesothelial cell viability is critical to long-term successful peritoneal dialysis (PD) treatment. To clarify the viability mechanism of peritoneal mesothelial cells under PD solutions exposure, we examined the mechanisms of cellular response to this stress conditions. Here we report that the proteasome activity is inhibited when treated with PD solutions. Proteasome inhibition-mediated activation of salt-inducible kinase 2 (SIK2), an endoplasmic reticulum-resident protein, is important for mesothelial cell viability...
July 21, 2016: Cell Death & Disease
#20
Yingyi Liu, Sujie Gao, Xuebo Chen, Meihan Liu, Cuiying Mao, Xuedong Fang
MicroRNAs (miRNAs) are short non-coding RNAs that regulate gene expression through the endogenous RNA interference machinery. Treatments with combination of chemotherapy with surgery are essential for advanced-stage colorectal cancer. However, the development of chemoresistance is a major obstacle for clinical application of anticancer drugs. In this study, we report a miR-203-SIK2 axis that involves in the regulation of Taxol sensitivity in colon cancer cells. MiR-203 is downregulated in human colon tumor specimens and cell lines compared with their normal counterparts...
September 2016: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
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