共查询到20条相似文献,搜索用时 15 毫秒
1.
Huanlian Tian Feng Chen Yingfang Wang Yixuan Liu Guojing Ma Yuhong Zhao Yanan Ma Tingting Tian Ruze Ma Yang Yu Difei Wang 《Journal of cellular and molecular medicine》2022,26(8):2163
Inflammation is a major risk factor for osteoporosis, and reducing inflammatory levels is important for the prevention of osteoporosis. Although nuclear receptor 77 (Nur77) protects against inflammation in a variety of diseases, its role in osteoporosis is unknown. Therefore, the main purpose of this study was to investigate the osteoprotective and anti‐inflammatory effects of Nur77. The microCT and haematoxylin and eosin staining results indicated that knockout of Nur77 accelerated femoral bone loss in mice. The enzyme‐linked immunosorbent assay (ELISA) results showed that knockout of Nur77 increased the serum levels of hsCRP and IL‐6. The expression levels of NF‐κB, IL‐6, TNF‐α and osteoclastogenesis factors (TRAP, NFATC1, Car2, Ctsk) in the femurs of Nur77 knockout mice were increased significantly. Furthermore, in vitro, shNur77 promoted the differentiation of RAW264.7 cells into osteoclasts by activating NF‐κB, which was confirmed by PDTC treatment. Mechanistically, Nur77 inhibited osteoclast differentiation by inducing IκB‐α and suppressing IKK‐β. In RAW264.7 cells, overexpression of Nur77 alleviated inflammation induced by siIκB‐α, while siIKK‐β alleviated inflammation induced by shNur77. Consistent with the in vivo studies, we found that compared with control group, older adults with high serum hsCRP levels were more likely to suffer from osteoporosis (OR = 1.76, p < 0.001). Our data suggest that Nur77 suppresses osteoclast differentiation by inhibiting the NF‐κB signalling pathway, strongly supporting the notion that Nur77 has the potential to prevent and treat osteoporosis. 相似文献
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Stefania Raimondo Ornella Urzì Serena Meraviglia Marta Di Simone Anna Maria Corsale Nima Rabienezhad Ganji Antonio Palumbo Piccionello Giulia Polito Elena Lo Presti Francesco Dieli Alice Conigliaro Riccardo Alessandro 《Journal of cellular and molecular medicine》2022,26(15):4195
Chronic inflammation is associated with the occurrence of several diseases. However, the side effects of anti‐inflammatory drugs prompt the identification of new therapeutic strategies. Plant‐derived extracellular vesicles (PDEVs) are gaining increasing interest in the scientific community for their biological properties. We isolated PDEVs from the juice of Citrus limon L. (LEVs) and characterized their flavonoid, limonoid and lipid contents through reversed‐phase high‐performance liquid chromatography coupled to electrospray ionization quadrupole time‐of‐flight mass spectrometry (RP‐HPLC–ESI‐Q‐TOF‐MS). To investigate whether LEVs have a protective role on the inflammatory process, murine and primary human macrophages were pre‐treated with LEVs for 24 h and then were stimulated with lipopolysaccharide (LPS). We found that pre‐treatment with LEVs decreased gene and protein expression of pro‐inflammatory cytokines, such as IL‐6, IL1‐β and TNF‐α, and reduced the nuclear translocation and phosphorylation of NF‐κB in LPS‐stimulated murine macrophages. The inhibition of NF‐κB activation was associated with the reduction in ERK1‐2 phosphorylation. Furthermore, the ability of LEVs to decrease pro‐inflammatory cytokines and increase anti‐inflammatory molecules was confirmed ex vivo in human primary T lymphocytes. In conclusion, we demonstrated that LEVs exert anti‐inflammatory effects both in vitro and ex vivo by inhibiting the ERK1‐2/NF‐κB signalling pathway. 相似文献
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Hangjie Ying Min Fang Qing Qing Hang Yamei Chen Xu Qian Ming Chen 《Journal of cellular and molecular medicine》2021,25(18):8662
Radiation‐induced lung injury (RILI) mainly contributes to the complications of thoracic radiotherapy. RILI can be divided into radiation pneumonia (RP) and radiation‐induced lung fibrosis (RILF). Once RILF occurs, patients will eventually develop irreversible respiratory failure; thus, a new treatment strategy to prevent RILI is urgently needed. This study explored the therapeutic effect of pirfenidone (PFD), a Food and Drug Administration (FDA)‐approved drug for (IPF) treatment, and its mechanism in the treatment of RILF. In vivo, C57BL/6 mice received a 50 Gy dose of X‐ray radiation to the whole thorax with or without the administration of PFD. Collagen deposition and fibrosis in the lung were reversed by PFD treatment, which was associated with reduced M2 macrophage infiltration and inhibition of the transforming growth factor‐β1 (TGF‐β1)/Drosophila mothers against the decapentaplegic 3 (Smad3) signalling pathway. Moreover, PFD treatment decreased the radiation‐induced expression of TGF‐β1 and phosphorylation of Smad3 in alveolar epithelial cells (AECs) and vascular endothelial cells (VECs). Furthermore, IL‐4–induced M2 macrophage polarization and IL‐13–induced M2 macrophage polarization were suppressed by PFD treatment in vitro, resulting in reductions in the release of arginase‐1 (ARG‐1), chitinase 3‐like 3 (YM‐1) and TGF‐β1. Notably, the PFD‐induced inhibitory effects on M2 macrophage polarization were associated with downregulation of nuclear factor kappa‐B (NF‐κB) p50 activity. Additionally, PFD could significantly inhibit ionizing radiation‐induced chemokine secretion in MLE‐12 cells and consequently impair the migration of RAW264.7 cells. PFD could also eliminate TGF‐β1 from M2 macrophages by attenuating the activation of TGF‐β1/Smad3. In conclusion, PFD is a potential therapeutic agent to ameliorate fibrosis in RILF by reducing M2 macrophage infiltration and inhibiting the activation of TGF‐β1/Smad3. 相似文献
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Marina Kolesnichenko Nadine Mikuda Uta E Hpken Eva Krgel Bora Uyar Ahmet Bugra Tufan Maja Milanovic Wei Sun Inge Krahn Kolja Schleich Linda von Hoff Michael Hinz Michael Willenbrock Sabine Jungmann Altuna Akalin Soyoung Lee Ruth SchmidtUllrich Clemens A Schmitt Claus Scheidereit 《The EMBO journal》2021,40(6)
6.
Jiansen Lu Hong Guan Dan Wu Zhiqiang Hu Hongbo Zhang Huaji Jiang Jingyao Yu Ke Zeng Hongyu Li Haiyan Zhang Chenglong Pan Daozhang Cai Xiao Yu 《Journal of cellular and molecular medicine》2021,25(14):6664
Synovial macrophage polarization and inflammation are essential for osteoarthritis (OA) development, yet the molecular mechanisms and regulation responsible for the pathogenesis are still poorly understood. Here, we report that pseudolaric acid B (PAB) attenuated articular cartilage degeneration and synovitis during OA. PAB, a diterpene acid, specifically inhibited NF‐κB signalling and reduced the production of pro‐inflammatory cytokines, which further decreased M1 polarization and vessel formation. We further provide in vivo and in vitro evidences that PAB suppressed NF‐κB signalling by stabilizing PPARγ. Using PPARγ antagonist could abolish anti‐inflammatory effect of PAB and rescue the activation of NF‐κB signalling during OA. Our findings identify a previously unrecognized role of PAB in the regulation of OA and provide mechanisms by which PAB regulates NF‐κB signalling through PPARγ, which further suggest targeting synovial inflammation or inhibiting vessel formation at early stage could be an effective preventive strategy for OA. 相似文献
7.
Gunter Maubach Michelle C C Lim Olga Sokolova Steffen Backert Thomas F Meyer Michael Naumann 《EMBO reports》2021,22(9)
Helicobacter pylori infection constitutes one of the major risk factors for the development of gastric diseases including gastric cancer. The activation of nuclear factor‐kappa‐light‐chain‐enhancer of activated B cells (NF‐κB) via classical and alternative pathways is a hallmark of H. pylori infection leading to inflammation in gastric epithelial cells. Tumor necrosis factor receptor‐associated factor (TRAF)‐interacting protein with forkhead‐associated domain (TIFA) was previously suggested to trigger classical NF‐κB activation, but its role in alternative NF‐κB activation remains unexplored. Here, we identify TRAF6 and TRAF2 as binding partners of TIFA, contributing to the formation of TIFAsomes upon H. pylori infection. Importantly, the TIFA/TRAF6 interaction enables binding of TGFβ‐activated kinase 1 (TAK1), leading to the activation of classical NF‐κB signaling, while the TIFA/TRAF2 interaction causes the transient displacement of cellular inhibitor of apoptosis 1 (cIAP1) from TRAF2, and proteasomal degradation of cIAP1, to facilitate the activation of the alternative NF‐κB pathway. Our findings therefore establish a dual function of TIFA in the activation of classical and alternative NF‐κB signaling in H. pylori‐infected gastric epithelial cells. 相似文献
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Gang Pei Joanna Zyla Lichun He Pedro MouraAlves Heidrun Steinle Philippe Saikali Laura Lozza Natalie Nieuwenhuizen January Weiner HansJoachim Mollenkopf Kornelia Ellwanger Christine Arnold Mojie Duan Yulia Dagil Mikhail Pashenkov Ivo Gomperts Boneca Thomas A Kufer Anca Dorhoi Stefan HE Kaufmann 《The EMBO journal》2021,40(13)
Cellular stress has been associated with inflammation, yet precise underlying mechanisms remain elusive. In this study, various unrelated stress inducers were employed to screen for sensors linking altered cellular homeostasis and inflammation. We identified the intracellular pattern recognition receptors NOD1/2, which sense bacterial peptidoglycans, as general stress sensors detecting perturbations of cellular homeostasis. NOD1/2 activation upon such perturbations required generation of the endogenous metabolite sphingosine‐1‐phosphate (S1P). Unlike peptidoglycan sensing via the leucine‐rich repeats domain, cytosolic S1P directly bound to the nucleotide binding domains of NOD1/2, triggering NF‐κB activation and inflammatory responses. In sum, we unveiled a hitherto unknown role of NOD1/2 in surveillance of cellular homeostasis through sensing of the cytosolic metabolite S1P. We propose S1P, an endogenous metabolite, as a novel NOD1/2 activator and NOD1/2 as molecular hubs integrating bacterial and metabolic cues. 相似文献
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Siyu Yuan Can Wei Guofang Liu Lijun Zhang Jiahao Li Lingling Li Shiyi Cai Ling Fang 《Cell proliferation》2022,55(1)
ObjectivesEvidences demonstrate that sorafenib alleviates liver fibrosis via inhibiting HSC activation and ECM accumulation. The underlying mechanism remains unclear. Ferroptosis, a novel programmed cell death, regulates diverse physiological/pathological processes. In this study, we aim to investigate the functional role of HSC ferroptosis in the anti‐fibrotic effect of sorafenib.Materials and MethodsThe effects of sorafenib on HSC ferroptosis and ECM expression were assessed in mouse model of liver fibrosis induced by CCl4. In vitro, Fer‐1 and DFO were used to block ferroptosis and then explored the anti‐fibrotic effect of sorafenib by detecting α‐SMA, COL1α1 and fibronectin proteins. Finally, HIF‐1α siRNA, plasmid and stabilizers were applied to assess related signalling pathway.ResultsSorafenib attenuated liver injury and ECM accumulation in CCl4‐induced fibrotic livers, accompanied by reduction of SLC7A11 and GPX4 proteins. In sorafenib‐treated HSC‐T6 cells, ferroptotic events (depletion of SLC7A11, GPX4 and GSH; accumulation iron, ROS and MDA) were discovered. Intriguingly, these ferroptotic events were not appeared in hepatocytes or macrophages. Sorafenib‐elicited HSC ferroptosis and ECM reduction were abrogated by Fer‐1 and DFO. Additionally, both HIF‐1α and SLC7A11 proteins were reduced in sorafenib‐treated HSC‐T6 cells. SLC7A11 was positively regulated by HIF‐1α, inactivation of HIF‐1α/SLC7A11 pathway was required for sorafenib‐induced HSC ferroptosis, and elevation of HIF‐1α could inhibit ferroptosis, ultimately limited the anti‐fibrotic effect.ConclusionsSorafenib triggers HSC ferroptosis via HIF‐1α/SLC7A11 signalling, which in turn attenuates liver injury and fibrosis. 相似文献
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Song Li Lihua Luo Yan He Ruohan Li Yangfan Xiang Zhenjie Xing Yejian Li Abdullkhaleg Ali Albashari Xiangyan Liao Keke Zhang Liang Gao Qingsong Ye 《Cell proliferation》2021,54(8)
ObjectivesThe study aimed to determine whether dental pulp stem cell‐derived exosomes (DPSC‐Exos) exert protective effects against cerebral ischaemia‐reperfusion (I/R) injury and explore its underlying mechanism.Materials and MethodsExosomes were isolated from the culture medium of human DPSC. Adult male C57BL/6 mice were subjected to 2 hours transient middle cerebral artery occlusion (tMCAO) injury followed by 2 hours reperfusion, after which singular injection of DPSC‐Exos via tail vein was administrated. Brain oedema, cerebral infarction and neurological impairment were measured on day 7 after exosomes injection. Then, oxygen‐glucose deprivation–reperfusion (OGD/R) induced BV2 cells were studied to analyse the therapeutic effects of DPSC‐Exos on I/R injury in vitro. Protein levels of TLR4, MyD88, NF‐κB p65, HMGB1, IL‐6, IL‐1β and TNF‐α were determined by western blot or enzyme‐linked immunosorbent assay. The cytoplasmic translocation of HMGB1 was detected by immunofluorescence staining.ResultsDPSC‐Exos alleviated brain oedema, cerebral infarction and neurological impairment in I/R mice. DPSC‐Exos inhibited the I/R‐mediated expression of TLR4, MyD88 and NF‐κB significantly. DPSC‐Exos also reduced the protein expression of IL‐6, IL‐1β and TNF‐α compared with those of the control both in vitro and in vivo. Meanwhile, DPSC‐Exos markedly decreased the HMGB1 cytoplasmic translocation induced by I/R damage.ConclusionsDPSC‐Exos can ameliorate I/R‐induced cerebral injury in mice. Its anti‐inflammatory mechanism might be related with the inhibition of the HMGB1/TLR4/MyD88/NF‐κB pathway. 相似文献
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Lei Zhang Jing Zhao Xiaodong Mu Sara J. McGowan Luise Angelini Ryan D. O'Kelly Matthew J. Yousefzadeh Ayumi Sakamoto Zaira Aversa Nathan K. LeBrasseur Yousin Suh Johnny Huard Theodore M. Kamenecka Laura J. Niedernhofer Paul D. Robbins 《Aging cell》2021,20(12)
Constitutive NF‐κB activation is associated with cellular senescence and stem cell dysfunction and rare variants in NF‐κB family members are enriched in centenarians. We recently identified a novel small molecule (SR12343) that inhibits IKK/NF‐κB activation by disrupting the association between IKKβ and NEMO. Here we investigated the therapeutic effects of SR12343 on senescence and aging in three different mouse models. SR12343 reduced senescence‐associated beta‐galactosidase (SA‐β‐gal) activity in oxidative stress‐induced senescent mouse embryonic fibroblasts as well as in etoposide‐induced senescent human IMR90 cells. Chronic administration of SR12343 to the Ercc1 −/ ∆ and Zmpste24 −/− mouse models of accelerated aging reduced markers of cellular senescence and SASP and improved multiple parameters of aging. SR12343 also reduced markers of senescence and increased muscle fiber size in 2‐year‐old WT mice. Taken together, these results demonstrate that IKK/NF‐κB signaling pathway represents a promising target for reducing markers of cellular senescence, extending healthspan and treating age‐related diseases. 相似文献
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Pu Chen Jun Zhou Anmin Ruan Hua Guan Jiewei Xie Lingfeng Zeng Jun Liu Qingfu Wang 《Journal of cellular and molecular medicine》2022,26(7):2038
Osteoarthritis (OA) is a whole‐joint disease characterized by synovial inflammation and cartilage degeneration. However, the relationship between synovial inflammation and cartilage degeneration remains unclear. The modified Hulth''s method was adopted to establish a knee OA (KOA) rabbit model. Synovial tissue was collected after 8 weeks, and synovial tissue‐derived extracellular vesicles (ST‐EVs) were extracted by filtration combined with size exclusion chromatography (SECF), followed by identification through transmission electron microscopy (TEM), nanoparticle tracer analysis (NTA) and Western blot (WB). The collagenase digestion method was used to extract normal rabbit chondrocytes, which were then treated with the SF‐EVs to observe the effect and mechanism of SF‐EVs on chondrocytes. The morphology, particle size and labelled protein marker detection confirmed that SECF successfully extract ST‐EVs. The ST‐EVs in the KOA state significantly inhibited chondrocyte proliferation and promoted chondrocytes apoptosis. Moreover, the ST‐EVs also promoted the expression of pro‐inflammatory cytokines (IL‐1β, IL‐6, TNF‐α and COX‐2) and cartilage degradation‐related enzymes (MMP13, MMP9 and ADAMTS5) in the chondrocytes. Mechanistically, the ST‐EVs significantly promoted the activation of NF‐κB signalling pathway in chondrocytes. Inhibition the activation of the NF‐κB signalling pathway significantly rescued the expression of inflammatory cytokines and cartilage degradation‐related enzymes in the ST‐EVs–induced chondrocytes. In conclusion, the ST‐EVs promote chondrocytes inflammation and degradation by activating the NF‐κB signalling pathway, providing novel insights into the occurrence and development of OA. 相似文献
16.
Liqiang Qiu Xiaoxiong Liu Wenjing Li Zhebo Liu Changwu Xu Hao Xia 《Journal of cellular and molecular medicine》2021,25(21):10224
Cardiomyocyte apoptosis is the main reason of cardiac injury after myocardial ischaemia‐reperfusion (I/R) injury (MIRI), but the role of p300/CBP‐associated factor (PCAF) on myocardial apoptosis in MIRI is unknown. The aim of this study was to investigate the main mechanism of PCAF modulating cardiomyocyte apoptosis in MIRI. The MIRI model was constructed by ligation of the rat left anterior descending coronary vessel for 30 min and reperfusion for 24 h in vivo. H9c2 cells were harvested after induced by hypoxia for 6 h and then reoxygenation for 24 h (H/R) in vitro. The RNA interference PCAF expression adenovirus was transfected into rat myocardium and H9c2 cells. The area of myocardial infarction, cardiac function, myocardial injury marker levels, apoptosis, inflammation and oxidative stress were detected respectively. Both I/R and H/R remarkably upregulated the expression of PCAF, and downregulation of PCAF significantly attenuated myocardial apoptosis, inflammation and oxidative stress caused by I/R and H/R. In addition, downregulation of PCAF inhibited the activation of NF‐κB signalling pathway in cardiomyocytes undergoing H/R. Pretreatment of lipopolysaccharide, a NF‐κB pathway activator, could blunt these protective effects of PCAF downregulation on myocardial apoptosis in MIRI. These results highlight that downregulation of PCAF could reduce cardiomyocyte apoptosis by inhibiting the NF‐κB pathway, thereby providing protection for MIRI. Therefore, PCAF might be a promising target for protecting against cardiac dysfunction induced by MIRI. 相似文献
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Jonas Wizenty Stefanie Müllerke Marina Kolesnichenko Julian Heuberger Manqiang Lin AnneSophie Fischer HansJoachim Mollenkopf Hilmar Berger Frank Tacke Michael Sigal 《The EMBO journal》2022,41(13)
Helicobacter pylori is a pathogen that colonizes the stomach and causes chronic gastritis. Helicobacter pylori can colonize deep inside gastric glands, triggering increased R‐spondin 3 (Rspo3) signaling. This causes an expansion of the “gland base module,” which consists of self‐renewing stem cells and antimicrobial secretory cells and results in gland hyperplasia. The contribution of Rspo3 receptors Lgr4 and Lgr5 is not well explored. Here, we identified that Lgr4 regulates Lgr5 expression and is required for H. pylori‐induced hyperplasia and inflammation, while Lgr5 alone is not. Using conditional knockout mice, we reveal that R‐spondin signaling via Lgr4 drives proliferation of stem cells and also induces NF‐κB activity in the proliferative stem cells. Upon exposure to H. pylori, the Lgr4‐driven NF‐κB activation is responsible for the expansion of the gland base module and simultaneously enables chemokine expression in stem cells, resulting in gland hyperplasia and neutrophil recruitment. This demonstrates a connection between R‐spondin‐Lgr and NF‐κB signaling that links epithelial stem cell behavior and inflammatory responses to gland‐invading H. pylori. 相似文献
18.
Mengyuan Li Yu Yan Xinxin Zhang Yidan Zhang Xiaohan Xu Lei Zhang Liangliang Lu Jie Wang Yazhuo Zhang Qiaoling Song Chenyang Zhao 《Journal of cellular and molecular medicine》2021,25(13):6333
JAK/STAT and NFκB signalling pathways play essential roles in regulating inflammatory responses, which are important pathogenic factors of various serious immune‐related diseases, and function individually or synergistically. To find prodrugs that can treat inflammation, we performed a preliminary high‐throughput screening of 18 840 small molecular compounds and identified scaffold compound L971 which significantly inhibited JAK/STAT and NFκB driven luciferase activities. L971 could inhibit the constitutive and stimuli‐dependent activation of STAT1, STAT3 and IκBα and could significantly down‐regulate the proinflammatory gene expression in mouse peritoneal macrophages stimulated by LPS. Gene expression profiles upon L971 treatment were determined using high‐throughput RNA sequencing, and significant differentially up‐regulated and down‐regulated genes were identified by DESeq analysis. The bioinformatic studies confirmed the anti‐inflammatory effects of L971. Finally, L971 anti‐inflammatory character was further verified in LPS‐induced sepsis shock mouse model in vivo. Taken together, these data indicated that L971 could down‐regulate both JAK/STAT and NFκB signalling activities and has the potential to treat inflammatory diseases such as sepsis shock. 相似文献
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Seungjin Ryu Jeehae Han Trina M. NordenKrichmar Quanwei Zhang Seunggeun Lee Zhengdong Zhang Gil Atzmon Laura J. Niedernhofer Paul D. Robbins Nir Barzilai Nicholas J. Schork Yousin Suh 《Aging cell》2021,20(7)
Gene variants associated with longevity are also associated with protection against cognitive decline, dementia and Alzheimer''s disease, suggesting that common physiologic pathways act at the interface of longevity and cognitive function. To test the hypothesis that variants in genes implicated in cognitive function may promote exceptional longevity, we performed a comprehensive 3‐stage study to identify functional longevity‐associated variants in ~700 candidate genes in up to 450 centenarians and 500 controls by target capture sequencing analysis. We found an enrichment of longevity‐associated genes in the nPKC and NF‐κB signaling pathways by gene‐based association analyses. Functional analysis of the top three gene variants (NFKBIA, CLU, PRKCH) suggests that non‐coding variants modulate the expression of cognate genes, thereby reducing signaling through the nPKC and NF‐κB. This matches genetic studies in multiple model organisms, suggesting that the evolutionary conservation of reduced PKC and NF‐κB signaling pathways in exceptional longevity may include humans. 相似文献
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Moein Ala Razieh Mohammad Jafari Mahan Ala Sedigheh Marjaneh Hejazi Seyed Mohammad Tavangar Seied Rabi Mahdavi Ahmad Reza Dehpour 《Journal of cellular and molecular medicine》2022,26(16):4556
Radiation‐induced oral mucositis is a common and dose‐limiting complication of head and neck radiotherapy with no effective treatment. Previous studies revealed that sildenafil, a phosphodiesterase 5 inhibitor, has anti‐inflammatory and anti‐cancer effects. In this study, we investigated the effect of sildenafil on radiation‐induced mucositis in rats. Two doses of radiation (8 and 26 Gy X‐ray) were used to induce low‐grade and high‐grade oral mucositis, separately. A control group and three groups of sildenafil citrate‐treated rats (5, 10, and 40 mg/kg/day) were used for each dose of radiation. Radiation increased MDA and activated NF‐κB, ERK and JNK signalling pathways. Sildenafil significantly decreased MDA level, nitric oxide (NO) level, IL1β, IL6 and TNF‐α. The most effective dose of sildenafil was 40 mg/kg/day in this study. Sildenafil also significantly inhibited NF‐κB, ERK and JNK signalling pathways and increased bcl2/bax ratio. In addition, high‐dose radiation severely destructed the mucosal layer in histopathology and led to mucosal cell apoptosis in the TUNEL assay. Sildenafil significantly improved mucosal structure and decreased inflammatory cell infiltration after exposure to high‐dose radiation and reduced apoptosis in the TUNEL assay. These findings show that sildenafil can improve radiation‐induced oral mucositis and decrease the apoptosis of mucosal cells via attenuation of inflammation and oxidative stress. 相似文献