mitogen-activated protein kinase 14

Overview

Mitogen-activated protein kinase 14 (MAPK14), also known as p38α MAPK, is a serine/threonine protein kinase in the p38 mitogen-activated protein kinase signaling family. It is a central component of stress-responsive signaling networks that transmit extracellular and intracellular cues into changes in gene expression, inflammation, cell survival, differentiation, senescence, and apoptosis. In biomedical research, MAPK14 is frequently studied as a pathway node rather than as a standalone disease gene because its activity integrates signals from cytokines, environmental stressors, metabolic perturbations, and tissue injury.

Functionally, MAPK14 is especially relevant in inflammatory and degenerative conditions, where p38 MAPK signaling can regulate matrix remodeling, cytokine production, autophagy, and stress responses. The recent studies summarized below place MAPK14 in contexts including osteoarthritis cartilage damage, gastric cancer immunosuppression, diabetic nephropathy, cerebral ischemia-reperfusion injury, fibroblast senescence, and liver injury, underscoring its broad role in disease-associated signaling.

Focus of Latest Publications

Recent studies document elevated p38 mitogen-activated protein kinase (p38 MAPK) phosphorylation across multiple disease contexts. In osteoarthritis models, TCDD exposure promotes increased p38 MAPK phosphorylation associated with matrix metalloproteinase-9-mediated cartilage damage. In type 2 diabetic nephropathy, elevated p38 MAPK activity correlates with renal fibrosis and inflammation. p38 MAPK phosphorylation is similarly upregulated in cerebral ischemia-reperfusion injury, non-alcoholic fatty liver disease, and lung fibroblast senescence, where it associates with pro-inflammatory cytokine production, oxidative stress, and tissue remodeling.

Multiple therapeutic approaches have demonstrated efficacy in suppressing p38 MAPK signaling. Moderate-intensity resistance training combined with vitamin D supplementation inhibited p38 MAPK and ERK1/2 phosphorylation in diabetic kidney disease, reducing renal fibrosis and proinflammatory cytokine levels. The multikinase inhibitor lenvatinib suppressed PDGFR/FGFR-dependent p38 MAPK and AKT signaling in tumor-associated macrophages, enhancing anti-tumor immunity when combined with pembrolizumab (anti-programmed cell death 1 blockade). Natural compounds also modulated p38 MAPK activity: hesperidin from orange peel demonstrated predicted binding affinity for p38 MAPK and reduced reactive oxygen species production and neutrophil activation in vitro and in vivo, while anthocyanins from purple barley bran inhibited p38 MAPK phosphorylation while activating nuclear factor erythroid 2-related factor 2 signaling in hepatocyte models of metabolic dysfunction–associated steatotic liver disease. The traditional Chinese medicine formulation Yangyin formula suppressed both p38 MAPK and NF-κB in cerebral ischemia-reperfusion injury models, and taurine supplementation restored p38 MAPK inhibition in lung fibroblasts by enhancing peroxisomal function.

Across these diverse therapeutic interventions, p38 MAPK inhibition produced consistent functional benefits: reduced proinflammatory cytokine production, decreased oxidative stress, attenuated tissue fibrosis and cartilage matrix degradation, restored renal function in diabetic models, improved neurological outcomes following ischemic stroke, and mitigated cellular senescence phenotypes. The convergence of p38 MAPK targeting across distinct disease models and mechanistically diverse therapeutic approaches—from lifestyle interventions to kinase inhibitors to natural bioactive compounds—underscores the central role of this kinase in driving inflammation-associated tissue damage and highlights its potential as a rational therapeutic target across multiple chronic disease states.

Key Publications

NEWJul MMP9 mediates 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-induced osteoarthritis cartilage damage via regulating the p38 MAPK pathway: A mechanistic study based on network toxicology and multi-omics. (Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, 2026, PMID 42392495): "These findings indicate that MMP9 may be associated with TCDD-related OA cartilage damage and may participate in cartilage ECM dysregulation through MAPK signaling, particularly the p38 MAPK branch."
NEWJun Biomedical publication details. (PubMed Database, 2026, PMID 42324976)
Jun Synergistic Renoprotective Effects of Moderate-Intensity Resistance Training and Vitamin D Supplementation on a Type 2 Diabetic Nephropathy Rat Model. (FASEB journal : official publication of the Federation of American Societies for Experimental Biology, 2026, PMID 42227748): "Mechanistically, MRV upregulated renal VD receptor (VDR) expression and inhibited the p38 mitogen-activated protein kinase (MAPK) and ERK1/2 signaling pathways, resulting in reduced renal fibrosis and local inflammation."
May Mechanistic insights into the neuroprotective effects of yangyin formula on cerebral ischemia-reperfusion injury via the IL-17A/MAPK/NF-κB signaling pathway. (Journal of molecular histology, 2026, PMID 42101703): "Furthermore, YYF suppressed IL-17A, TNF-α, IL-1β, Caspase-3, p38 MAPK, and NF-κB p65 expression in brain and serum, with effects comparable to IL-17A inhibition."
Jul Lenvatinib Combined with PD-1 Blockade Therapy Benefits Gastric Cancers through Immunosuppressive Macrophage Modulation. (Cancer immunology research, 2026, PMID 42044259): "Mechanistically, lenvatinib inhibited platelet-derived growth factor receptor α (PDGFRα)/fibroblast growth factor receptor (FGFR)-dependent p38 mitogen-activated protein kinase (MAPK) and AKT signaling pathways in F4/80highCD11bint immunosuppressive macrophages, triggering endoplasmic reticulum stress and an unresolved unfolded protein response, resulting in their apoptosis."
May PEX5 integrates the p38 MAPK signaling pathway and taurine metabolism to regulate senescence in lung fibroblasts. (Experimental cell research, 2026, PMID 41794210): "Loss of PEX5 activated p38 mitogen-activated protein kinase (p38 MAPK) signaling, reduced nuclear translocation of the transcription factor EB (TFEB), and impaired autophagic flux, thereby promoting a pro-senescent cellular state."
Apr Hepatoprotective potential of anthocyanins from purple highland barley bran against non-alcoholic fatty liver disease through gut-liver axis. (Food research international (Ottawa, Ont.), 2026, PMID 41794448): "the underlying mechanism was partially involved in the activation of the nuclear factor erythroid-2-related factor 2 (Nrf2) pathway and inhibition of p38 mitogen-activated protein kinase (MAPK) pathway."