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Salt Inducible Kinase Signaling Networks: Implications for Acute Kidney Injury and Therapeutic Potential
1Biochemistry Dept, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, 955 Main Street Suite 4102, Buffalo, NY 14203, USA. biochtau@buffalo.edu.
Abstract:
A number of signal transduction pathways are activated during Acute Kidney Injury (AKI). Of particular interest is the Salt Inducible Kinase (SIK) signaling network, and its effects on the Renal Proximal Tubule (RPT), one of the primary targets of injury in AKI. The SIK1 network is activated in the RPT following an increase in intracellular Na+ (Na+in), resulting in an increase in Na,K-ATPase activity, in addition to the phosphorylation of Class IIa Histone Deacetylases (HDACs). In addition, activated SIKs repress transcriptional regulation mediated by the interaction between cAMP Regulatory Element Binding Protein (CREB) and CREB Regulated Transcriptional Coactivators (CRTCs). Through their transcriptional effects, members of the SIK family regulate a number of metabolic processes, including such cellular processes regulated during AKI as fatty acid metabolism and mitochondrial biogenesis. SIKs are involved in regulating a number of other cellular events which occur during AKI, including apoptosis, the Epithelial to Mesenchymal Transition (EMT), and cell division. Recently, the different SIK kinase isoforms have emerged as promising drug targets, more than 20 new SIK2 inhibitors and activators having been identified by MALDI-TOF screening assays. Their implementation in the future should prove to be important in such renal disease states as AKI.
Insights
Salt Inducible Kinases (SIK) activate in the renal proximal tubule during Acute Kidney Injury (AKI), impacting cellular processes. Targeting SIK isoforms offers a promising therapeutic strategy for AKI treatment.
Area of Science:
- Nephrology
- Molecular Biology
- Biochemistry
Background:
- Acute Kidney Injury (AKI) involves complex signal transduction pathways.
- The Salt Inducible Kinase (SIK) signaling network plays a critical role in the Renal Proximal Tubule (RPT), a key site of AKI.
- Understanding SIK's role is crucial for developing AKI therapies.
Purpose of the Study:
- To elucidate the role of the SIK signaling network in the RPT during AKI.
- To investigate the molecular mechanisms by which SIKs influence cellular processes in AKI.
- To highlight SIK isoforms as potential therapeutic targets for AKI.
Main Methods:
- Analysis of SIK1 network activation in RPT following increased intracellular Na+.
- Investigation of SIK-mediated phosphorylation of Class IIa Histone Deacetylases (HDACs).
- Examination of SIK's repression of CREB-CRTC transcriptional regulation.
Main Results:
- SIK1 activation in RPT increases Na,K-ATPase activity and HDAC phosphorylation.
- SIKs repress CREB-CRTC transcriptional activity, affecting metabolic processes like fatty acid metabolism and mitochondrial biogenesis.
- SIKs regulate apoptosis, Epithelial to Mesenchymal Transition (EMT), and cell division in AKI.
Conclusions:
- The SIK signaling network is a key regulator of cellular events during AKI in the RPT.
- SIK isoforms represent promising therapeutic targets for AKI.
- Over 20 SIK2 inhibitors and activators have been identified, suggesting potential for future renal disease treatments.
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