{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSerum‐ and glucocorticoid‐inducible kinase 1 (SGK1) is a versatile serine/threonine kinase whose activation is driven by diverse stimuli—including glucocorticoids, insulin/growth factors, cellular stress, and hormones—and which integrates signals from pathways such as PI3K/PDK1/mTORC2 and the glucocorticoid receptor. Upon activation, SGK1 phosphorylates multiple substrates to modulate fundamental cellular processes. For example, it directly phosphorylates the NDRG family proteins, thereby priming them for subsequent modification by GSK3, and regulates cell cycle and survival through phosphorylation of targets such as p27, IKKα, and FoxO transcription factors. These events contribute to altered gene expression and adjustments in apoptosis and cell‐cycle progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn epithelia—particularly in the kidney—SGK1 is a central regulator of ion channel and transporter activity. By phosphorylating and inhibiting regulatory proteins such as the ubiquitin ligase Nedd4-2, SGK1 enhances the plasma membrane expression of channels including the epithelial sodium channel (ENaC), ROMK, and KCNE1/KCNQ1. This kinase thereby promotes sodium reabsorption and potassium secretion, linking upstream regulators (e.g. aldosterone, glucocorticoids, and PPARγ agonists) to blood pressure control and electrolyte homeostasis. Moreover, SGK1 activation by upstream kinases such as mTORC2 further ensures proper channel trafficking, while genetic studies reinforce its physiological role in blood pressure regulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its homeostatic roles, aberrant SGK1 activity contributes to multiple pathological conditions. In cancer, SGK1 is upregulated in various tumors and supports cell survival by, for instance, promoting p53 degradation and inhibiting apoptosis—mechanisms that can underpin resistance to targeted therapies. In the nervous system, SGK1 modulates neurogenesis, synaptic plasticity, and neuroprotection as demonstrated in Huntington’s disease models, while altered SGK1 expression has been linked to depressive phenotypes and hippocampal atrophy. Furthermore, SGK1 activity influences vascular smooth muscle cell transdifferentiation and calcification, participates in cardiac remodeling during heart failure, and modulates endometrial function—thereby affecting implantation and pregnancy outcomes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "32"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, SGK1 itself is subject to tight post‐translational control. Its protein levels and activity are modulated by processes such as ubiquitination and endoplasmic reticulum–associated degradation—mechanisms that fine‐tune its signaling output. In the immune system, SGK1 influences the balance between pro‐inflammatory Th17 cells and regulatory T cells by altering transcription factor localization, thereby impacting autoimmune responses. 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