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PHYTOTHERAPY RESEARCH · 2025 · IF 6.3

Sinomenine Ameliorates Liver Fibrosis by Blocking TGF-β/SMAD and c-JUN Signaling

Yichao Du,Junjie Bai,Tingting Ma,Ziming Wu,Pengru Wang,Xiaolin Zhong,Wenguang Fu,Shuixiang He

Liver fibrosis, a pivotal pathological feature in the progression of chronic liver injury, currently lacks effective therapies. Sinomenine (SIN), a bioactive alkaloid derived from traditional Chinese medicine, demonstrates diverse pharmacological properties. However, its therapeutic potential and mechanisms in liver fibrosis remain inadequately characterized. This study investigates the anti-fibrotic effects of SIN and its underlying molecular mechanisms. The anti-fibrotic efficacy of SIN was evaluated in two murine models of liver fibrosis induced by carbon tetrachloride (CCl 4 ) or bile duct ligation (BDL), along with transforming growth factor-beta 1 (TGF-β1)-stimulated rat hepatic stellate cells (HSC-T6). Serum biochemical markers, histopathological analyses (Hematoxylin–Eosin, Sirius red, and Masson's trichrome staining), immunofluorescence, and immunohistochemistry were employed to assess hepatic injury and collagen deposition. Western blotting elucidated molecular mechanisms. SIN administration significantly attenuated hepatic injury in CCl 4 - or BDL-induced mice, as evidenced by reduced transaminase levels and improved histopathological features. In both in vivo and in vitro models, SIN suppressed fibrogenesis by decreasing collagen deposition and downregulating expression of α-smooth muscle actin (α-SMA), matrix metalloproteinase 2 (MMP2), and collagen I. Mechanistically, SIN inhibited the TGF-β/SMAD pathway through reduced phosphorylation of SMAD2/3 and attenuated c-JUN signaling via diminished phosphorylated c-JUN levels. Pretreatment with TP0427736 (a SMAD2/3 inhibitor) or SP600125 (a c-JUN inhibitor) synergistically enhanced SIN-mediated α-SMA suppression in HSC-T6 cells. SIN ameliorates liver fibrosis through inhibition of TGF-β/SMAD and c-JUN signaling pathways. These findings position SIN as a promising therapeutic candidate for liver fibrotic disorders.

研究领域: 药理学 · 肝脏病学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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Journal of Pharmaceutical Analysis · 2024 · IF 6.1

Aldolase A accelerates hepatocarcinogenesis by refactoring c-Jun transcription

Xin Yang,Guang-Yuan Ma,Xiao-Qiang Li,Na Tang,Yang Sun,Xiao-Wei Hao,Ke-Han Wu,Yu-Bo Wang,Wen Tian,Xin Fan,Zezhi Li,Caixia Feng,Xu Chao,Yu-Fan Wang,Yao Liu,Di Li,Wei Cao

Hepatocellular carcinoma (HCC) expresses abundant glycolytic enzymes and displays comprehensive glucose metabolism reprogramming. Aldolase A (ALDOA) plays a prominent role in glycolysis; however, little is known about its role in HCC development. In the present study, we aim to explore how ALDOA is involved in HCC proliferation. HCC proliferation was markedly suppressed both in vitro and in vivo following ALDOA knockout, which is consistent with ALDOA overexpression encouraging HCC proliferation. Mechanistically, ALDOA knockout partially limits the glycolytic flux in HCC cells. Meanwhile, ALDOA translocated to nuclei and directly interacted with c-Jun to facilitate its Thr93 phosphorylation by P21-activated protein kinase; ALDOA knockout markedly diminished c-Jun Thr93 phosphorylation and then dampened c-Jun transcription function. A crucial site Y364 mutation in ALDOA disrupted its interaction with c-Jun, and Y364S ALDOA expression failed to rescue cell proliferation in ALDOA deletion cells. In HCC patients, the expression level of ALDOA was correlated with the phosphorylation level of c-Jun (Thr93) and poor prognosis. Remarkably, hepatic ALDOA was significantly upregulated in the promotion and progression stages of diethylnitrosamine-induced HCC models, and the knockdown of ALDOA strikingly decreased HCC development in vivo . Our study demonstrated that ALDOA is a vital driver for HCC development by activating c-Jun-mediated oncogene transcription, opening additional avenues for anti-cancer therapies.

CAS / MDL: 55-18-5
研究领域: 肿瘤学 · 分子生物学 · 癌症研究
✓ 已验证 产品关联 DOI PubMed 高影响因子
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY · 2021 · IF 5.279

Promotion Effect of EGCG on the Raised Expression of IL-23 through the Signaling of STAT3-BATF2-c-JUN/ATF2

Yaozhong Hu,Jiaxin Gu,Yi Wang,Jing Lin,Huaning Yu,Feier Yang,Sihao Wu,Jia Yin,Huan Lv,Xuemeng Ji,Shuo Wang

Tea polyphenol of epigallocatechin-3-gallate (EGCG) has been verified to possess multiple biological activities. Interleukin-23 (IL-23) is a heterodimeric cytokine consisting of two subunits of IL-23p19 and IL-12p40, with the functionality in regulating the production of cytokines under physiological or pathological conditions. By serendipity, the raised expression of IL-23 was observed after treating cells with EGCG, whereas the detailed mechanism remains poorly understood. This study was proposed to investigate the signaling related to EGCG-induced IL-23. The raised expression of IL-23 was confirmed primarily by intraperitoneally injecting with different concentrations of EGCG (0, 20, 50, 80 mg/kg) into BALB/c mice, and the raised expression was confirmed by quantitative real-time polymerase chain reaction (qRT-PCR) and western blot. Results from enzyme-linked immunosorbent assay (ELISA) revealed the increase of IL-23 in serum from 116.09 to 153.90 pg/mL after treating with EGCG. The same results were also observed in RAW264.7 and peritoneal macrophages after treating with EGCG (0, 1, 5, 10, 25 μM) with the increased tendency of IL-23 in cultural medium (7.98 to 25.38 pg/mL for RAW264.7; 3.64 to 260.93 pg/mL for peritoneal macrophages). After preliminary exploration of the signaling related to the increased IL-23, the classical signaling pathways and key transcription factors, such as nuclear factor kappa-B (NF-κB), mitogen-activated protein kinase (MAPK) signaling pathways, and interferon regulatory factor 5 (IRF5), were demonstrated with no relevant contribution. A further study revealed the involvement of the key transcription factor of BATF2, which could antagonistically modulate the transcription and translation of IL-23. The signaling of STAT3-BATF2-c-JUN/ATF2-IL-23 has been further verified in RAW264.7 macrophages using the STAT3 inhibitor of AG490 and the activator of Colivelin TFA. The results indicated that EGCG inhibits the phosphorylation of STAT3 to facilitate the decreased level of BATF2, which contributed to the increased level of IL-23 by the enhancing heterodimerization of c-JUN and ATF2.

CAS / MDL: 989-51-5 553-24-2
研究领域: 免疫学 · 药理学 · 分子生物学 · 细胞生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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Communications Biology · 2023 ·Vol. 6 ·期 1 ·1-10 · IF 5.9

Inhibition of c-Jun in AgRP neurons increases stress-induced anxiety and colitis susceptibility

Jiao Fuxin,Hu Xiaoming,Yin Hanrui,Yuan Feixiang,Zhou Ziheng,Wu Wei,Chen Shanghai,Liu Zhanju,Guo Feifan

Psychiatric disorders, such as anxiety, are associated with inflammatory bowel disease (IBD), however, the neural mechanisms regulating this comorbidity are unknown. Here, we show that hypothalamic agouti-related protein (AgRP) neuronal activity is suppressed under chronic restraint stress (CRS), a condition known to increase anxiety and colitis susceptibility. Consistently, chemogenic activation or inhibition of AgRP neurons reverses or mimics CRS-induced increase of anxiety-like behaviors and colitis susceptibility, respectively. Furthermore, CRS inhibits AgRP neuronal activity by suppressing the expression of c-Jun. Moreover, overexpression of c-Jun in these neurons protects against the CRS-induced effects, and knockdown of c-Jun in AgRP neurons ( c-Jun ∆AgRP ) promotes anxiety and colitis susceptibility. Finally, the levels of secreted protein thrombospondin 1 (THBS1) are negatively associated with increased anxiety and colitis, and supplementing recombinant THBS1 rescues colitis susceptibility in c-Jun ∆AgRP mice. Taken together, these results reveal critical roles of hypothalamic AgRP neuron-derived c-Jun in orchestrating stress-induced anxiety and colitis susceptibility.

CAS / MDL: 119-90-4
研究领域: 神经科学 · 免疫学 · 精神病学 · 胃肠病学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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JOURNAL OF PARENTERAL AND ENTERAL NUTRITION · 2021 ·Vol. 46 ·期 6 ·1353-1360 · IF 4.016

Octanoic acid–rich enteral nutrition prevented lipopolysaccharide-induced acute liver injury through c-Jun N-terminal kinase–dependent autophagy

Kaiming He,Chun Cao,Xiangrong Xu,Zhenyu Ye,Xiaoming Ma,Wei Chen,Peng Du

Background Acute liver injury (ALI) is an essential component of sepsis associated with poor outcomes. Octanoic acid (OA), a medium-chain fatty acid, has a protective effect on sepsis-induced organ damage, and autophagy is an adaptive response to sepsis. However, the underlying mechanism by which OA prevents ALI remains unknown. Therefore, we investigated whether OA-rich enteral nutrition (EN) prevented lipopolysaccharide (LPS)-induced ALI through the c-Jun N-terminal kinase (JNK)-dependent autophagy. Methods Firstly, Sprague Dawley rats were randomly divided into four groups (sham, LPS, LPS + EN, and LPS + EN + OA) to detect the effect of OA-rich EN on LPS-induced ALI. Then, rats were randomly divided into five groups (sham, LPS, LPS + EN + OA, LPS + EN + OA + anisomycin (AN), and LPS + SP600125) to explore the mechanism by which OA-rich EN prevented ALI. EN and OA-rich EN were conducted through gastric tubes for 3 days. The liver protective effects were measured by liver histopathological changes, enzymes, inflammatory cytokines of serum and liver, the levels of autophagy, and JNK activity. Results OA-rich EN inhibited JNK activity, up-regulated autophagy and prevented LPS-induced ALI. Inhibition of JNK activity conferred by SP promoted autophagy and prevented LPS-induced ALI. Moreover, the protective effect of autophagy and inhibition of JNK activity conferred by OA-rich EN on ALI was counteracted by AN. Conclusion OA-rich EN prevented LPS-induced ALI through JNK-dependent autophagy. This result suggested that OA-rich EN may be a therapeutic potential for ALI in patients with sepsis.

研究领域: 肝病学 · 免疫学 · 营养学 · 分子生物学
✓ 已验证 DOI PubMed 高影响因子
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY · 2023 · IF 6.7

Synthesis-accessibility-oriented design of c-Jun N-terminal kinase 1 inhibitor

Hewen Qian,Yuanqing Ding,Xingyu Deng,Weiwei Huang,Zhenzhen Li,Fengling Liu,Jie Zhang,Lihui Wang,Junping Liu,Yaxia Yuan,Shurong Hou,Xiabin Chen,Lei Ma

Idiopathic pulmonary fibrosis (IPF) is a severe and progressive lung disease with poor prognosis and limited treatment options. The c -Jun N-Terminal Kinase 1 (JNK1), a key component of the MAPK pathway, has been implicated in the pathogenesis of IPF and represents a potential therapeutic target. However, the development of JNK1 inhibitors has been slowed, partly due to synthetic complexity in medicinal chemistry modification. Here, we report a synthesis-accessibility-oriented strategy for designing JNK1 inhibitors based on computational prediction of synthetic feasibility and fragment-based molecule generation. This strategy led to the discovery of several potent JNK1 inhibitors, such as compound C6 (IC 50  = 33.5 nM), which exhibited comparable activity to the clinical candidate CC-90001 (IC 50  = 24.4 nM). The anti-fibrotic effect of C6 was further confirmed in animal model of pulmonary fibrosis . Moreover, compound C6 could be synthesized in only two steps, compared to nine steps for CC-90001 . Our findings suggest that compound C6 is a promising lead for further optimization and development as a novel anti-fibrotic agent targeting JNK1. In addition, the discovery of C6 also demonstrates the feasibility of synthesis-accessibility-oriented strategy in lead discovery.

CAS / MDL: 22862-76-6
研究领域: 药理学 · 药物化学 · 肺科学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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International Journal of Nanomedicine · 2021 · IF 6.4

Nano-Sized Hydroxyapatite Induces Apoptosis and Osteogenic Differentiation of Vascular Smooth Muscle Cells via JNK/c-JUN Pathway

Qi Liu,Pingping Xiang,Mingyao Chen,Yi Luo,Yun Zhao,Jinyun Zhu,Wangwei Jing,Hong Yu

Purpose: The deposition of hydroxyapatite (HAp) crystals plays an important role in the development of vascular calcification (VC). This study aimed to demonstrate the effects of nanosized HAp (nHAp) on vascular smooth muscle cells (VSMCs) and VC progression.Methods: Transmission electron microscopy (TEM) was used to examine cellular uptake of nHAp. Cell viability was determined using CCK-8 assay kit. Mitochondrial impairment and reactive oxygen species were detected by TEM and fluorescence dye staining, respectively. Cell apoptosis was detected by Western blot analysis and Annexin V staining. Mouse model of VC was built via applying nHAp on the surface of abdominal aorta. Calcification was visualized by Alizarin red and von Kossa staining.Results: We found that nHAp could promote osteogenic transformation of VSMCs by elevating expression of runt-related factor 2 (Runx2), osteopontin (OPN) and alkaline phosphatase (ALP), impairing function and morphology of mitochondria and inducing apoptosis of VSMCs. More phosphorylation of c-Jun N-terminal protein kinase/c-JUN (JNK/c-JUN) in VSMCs was detected after mixing nHAp with VSMCs. HAp-induced osteogenic transformation of VSMCs was blocked by JNK inhibitor SP600125, resulted in decreased ALP activity, less Runx2 and OPN expressions. SP600125 also inhibited apoptosis of VSMCs. Application of nHAp to outside of aorta induced osteogenic transformation and apoptosis of VSMCs, and significant deposition of calcium on the vessel walls of mice, which can be effectively attenuated by SP600125.Conclusion: JNK/c-JUN signaling pathway is critical for nHAp-induced calcification, which could be a potential therapeutic target for controlling the progression of VC.

CAS / MDL: 1306-06-5 12167-74-7
研究领域: 心血管研究 · 细胞生物学 · 分子生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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JOURNAL OF ETHNOPHARMACOLOGY · 2025 · IF 5.4

Bu-zhong-yi-qi decoction regulates JNK/c-JUN signaling pathway to improve skeletal muscle atrophy caused by cancer cachexia

Jia Li,Ying Zhang,Zhe Su,Tangxiaoxiao He,Ze Chen,Zhiwei Pan,Chao Ding,Zhichao Yu,Lei Bi

Ethnopharmacological relevance With a prevalence reaching 80% in terminal cancer patients,Cancer cachexia (CC) manifests as irreversible skeletal muscle wasting. Presently, there exists no effective therapeutic strategy for managing cancer cachexia. Traditional Chinese medicine (TCM) contributes significantly to the management of CC, enhancing quality of life and potentially prolonging survival in affected patients. Bu-zhong-yi-qi decoction (BYD), a classical Chinese formulation, demonstrates therapeutic potential for tumor-associated conditions and muscle-related disorders. However, its precise pharmacological mechanisms remain to be fully elucidated. Aim of the study To systematically investigate the therapeutic effects and underlying mechanisms of BYD on muscle atrophy caused by CC through an integrated approach combining network pharmacology analysis with comprehensive in vivo and in vitro experimental validation. Materials and methods Network pharmacology analysis was employed to recognize‌ bioactive components, potential therapeutic targets, and associated pathways of BYD. Molecular docking simulations were subsequently performed to evaluate the binding affinity between BYD constituents and key target proteins. The skeletal muscle atrophy model of CC in vivo was established by subcutaneous injection of Lewis lung cancer (LLC) cells. The therapeutic efficacy of BYD was systematically evaluated through a comprehensive assessment of multiple parameters, including carcass weight, gastrocnemius muscle mass, histopathological alterations, the cross-sectional area (CSA) of muscle fibers and inflammatory markers. The muscle atrophy model in vitro was established by C2C12 mouse myoblasts and LLC cells to investigate the underlying mechanisms of BYD. qRT-PCR and Western blot analysis were employed to evaluate the regulatory effects of BYD on both mRNA and protein expression levels of MuRF-1, Atrogin-1 and key molecular components of the JNK/c-JUN signaling pathway. Results Network pharmacology analysis identified 146 bioactive components and 331 corresponding potential targets of BYD. KEGG pathway enrichment analysis revealed significant enrichment of BYD component targets in the MAPK signaling pathway. Molecular docking simulations revealed strong binding affinities between BYD's bioactive components and JUN protein. Experiments in vivo demonstrated that BYD could increase the carcass weight, gastrocnemius muscle mass and CSA of muscle fibers in mice with cachexia. Meanwhile, it could increase C2C12 myotube diameters in vitro . Additionally, BYD down-regulated the mRNA and protein expressions of MuRF-1, Atrogin-1 and JNK/c-JUN signaling pathway in vivo . Conclusions BYD might contribute to ameliorate muscle atrophy induced by CC through suppression of JNK/c-JUN signaling pathway and downregulation of muscle atrophy markers MuRF-1 and Atrogin-1. These findings suggested BYD as a potential therapeutic intervention for CC.

CAS / MDL: 9048-46-8
研究领域: 中药学 · 肿瘤学 · 分子生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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PHYTOMEDICINE · 2021 · IF 5.34

Higenamine alleviates allergic rhinitis by activating AKT1 and suppressing the EGFR/JAK2/c-JUN signaling

Xiaohan Wei,Baoping Zhang,Xiao Liang,Changshun Liu,Ting Xia,Yingjie Xie,Xue Deng,Xiaomei Tan

ABSTRACT Background Allergic rhinitis (AR) is an inflammatory, immunoglobulin E (IgE)-mediated disease characterized by the typical symptoms of sneezing, rhinorrhea , nasal itching , and congestion. Higenamine (HG) is a plant-based alkaloid, possesses a wide range of activities, including vascular and tracheal relaxation, antioxidative, antiapoptotic , anti-inflammatory, and immunomodulatory activities. So far, the effect and the underlying mechanism of HG on AR have not been studied. Hypothesis/Purpose The purpose of this study was to evaluate the effects of HG on AR and investigate its underlying mechanism. Methods The effects of HG on AR were evaluated in an ovalbumin-induced AR mouse model. Network pharmacology-based methods such as target prediction, protein-protein interaction (PPI) network analysis, pathway analysis, and molecular docking were used to identify the likely HG targets. Finally, we validated the mechanism of action of HG through its effects on these targets in human nasal epithelial cells (HNEpCs). Results Oral administration of 30, 60, and 120 mg/kg HG significantly alleviated rubbing and sneezing in AR mice and attenuated histopathological changes in the lung and nasal tissues . Additionally, HG reduced the levels of IgE, histamine, and IL-4 in the serum of AR mice, and regulated imbalance in Th1/Th2 cells. Using network pharmacology-based methods, we identified 29 HG targets related to AR. These targets are mainly involved in the PD-L1, relaxin, estrogen, HIF-1, Th1 and Th2 cell differentiation , T cell receptor , and the Th17 cell differentiation signaling pathways . Molecular docking showed that HG may well be suited to the receptor binding pockets of key target AKT1 , EGFR, c-Jun, NOS2 , and JAK2 . In HNEpCs, HG inhibited the histamine-induced mRNA expression and secretion of interleukin (IL)-6, and IL-8, as well as the expression of MUC5AC and the phosphorylation of NF-κB. Moreover, HG affected the changes of AKT1, EGFR, c-Jun, iNOS, and JAK2 induced by histamine. Conclusion Overall, our results suggest that HG may alleviate AR by activating AKT1 and suppressing the EGFR/JAK2/c-JUN signaling. HG, therefore, has great potential as a therapeutic agent for the treatment of AR.

CAS / MDL: 50-02-2
研究领域: 免疫学 · 药理学 · 分子生物学 · 细胞生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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IMMUNOLOGIC RESEARCH · 2025 ·Vol. 73 ·期 1 ·1-20 · IF 3.1

Piceatannol improves autoimmune hepatitis by inhibiting the immune activities of T cells and macrophages through binding with c-Jun

Xu Cong,Lu Chenqi,Wang Wu,Wang Zhimin,Qiu Yang,Han Min,Yang Jun,Li Shanglin

Autoimmune hepatitis (AIH) is an immune-mediated liver disease that currently lacks viable drug treatment methods. This study is to explore the role of piceatannol (PIC) in ConA-induced AIH and the related mechanisms. A mouse model of AIH was established by injecting ConA (i.v.), and PIC was administered as an intervention. The protective effect of PIC was evaluated by the liver function, liver pathology, and serum levels of inflammatory factors. Subsequently, network pharmacology was used to predict the pathways and targets of PIC in the treatment of AIH, and the predicted results were validated using flow cytometry, molecular docking, surface plasmon resonance (SPR) and so on. Finally, the immunosuppressive effect of PIC was further validated in a mouse heart transplantation model. PIC can improve liver function decline and reduce pathological liver damage, as well as inhibit the increase of serum inflammatory factor levels in mice with AIH induced by ConA. The protective effect is achieved by suppressing the immune activity of T cells and macrophages through binding to c-Jun. PIC can also extend the survival of cardiac allografts and inhibit acute rejection reactions. These results indicated that PIC can significantly improve ConA-induced AIH in mice by inhibiting the immune activity of T cells and macrophages through binding to c-Jun. PIC can also extend the survival of cardiac allografts in mice and inhibit acute rejection responses. The above results indicated that PIC may serve as a promising immunosuppressant and be effective for AIH.

CAS / MDL: 56-23-5
研究领域: 免疫学 · 肝病学 · 药理学 · 分子生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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INTERNATIONAL IMMUNOPHARMACOLOGY · 2023 · IF 5.6

Map4k4 is up-regulated and modulates granulosa cell injury and oxidative stress in polycystic ovary syndrome via activating JNK/c-JUN pathway: An experimental study

Lifeng Ding,Lili Jiang,Ze Xing,Huixu Dai,Jingzan Wei

The regulatory mechanism on granulosa cells (GCs) oxidative injury is becoming increasingly important in polycystic ovary syndrome (PCOS) studies. Serine/threonine kinase mitogen-activated protein 4 kinase 4 (Map4k4) is linked with oxidative injury and possibly associated with premature ovarian failure and ovarian dysgenesis. Herein, we investigated the function and mechanism of Map4k4 in a PCOS rat model. A microarray from GEO database identified Map4k4 was up-regulated in the ovarian of PCOS rats, and functional enrichments suggested that oxidative stress-associated changes are involved. We verified the raised Map4k4 expression in an established PCOS rat model and also in the isolated PCOS-GCs, which were consistent with the microarray data. Map4k4 knockdown in vivo contributed to regular estrous cycle, restrained steroid concentrations and ovarian injury in PCOS rats. Both Map4k4 silencing in vivo and in vitro attenuated the PCOS-related GC oxidative stress and apoptosis. Mechanically, Map4k4 activated the JNK/c-JUN signaling pathway. Importantly, a JNK agonist restored the suppressive effects of Map4k4 silencing on PCOS-induced granulosa cell injury and oxidative stress. Besides, Map4k4 may be a target gene of miR-185-5p. In conclusion, Map4k4, a potential target of miR-185-5p, is up-regulated and induces ovarian GC oxidative injury by activating JNK/c-JUN pathway in PCOS. The Map4k4/JNK/c-JUN mechanism may provide a new idea on the treatment of PCOS.

CAS / MDL: 53-43-0 47165-04-8
研究领域: 生殖生物学 · 分子生物学 · 内分泌学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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MOLECULAR HUMAN REPRODUCTION · 2014 ·Vol. 20 ·期 8 ·799-809 · IF 3.483

Dehydroascorbic acid taken up by glucose transporters stimulates estradiol production through inhibition of JNK/c-Jun/AP1 signaling in JAR cells

Wang Yongjie,Tang Chao,Wu Minglan,Pan Yibin,Ruan Hongfeng,Chen Linling,Yao Hongyi,Zhu Haibin,Wu Ximei

We have previously demonstrated that the reduced form of vitamin C (l-ascorbic acid, AA) is able to induce the production of both steroid and peptide hormones in human choriocarcinoma cells. Here, we attempted to investigate the role and underlying mechanism of the oxidized form of vitamin C, dehydroascorbic acid (DHA), in steroidogenesis in primary human cytotrophoblasts and human choriocarcinoma cells. Messenger RNA and protein levels of steroidogenic enzymes including P450 cholesterol side-chain cleavage enzyme (P450scc), 3β-hydroxysteroid dehydrogenase type 1 (3β-HSD1), 17β-hydroxysteroid dehydrogenase type 1 (17β-HSD1) and aromatase were examined by quantitative RT–PCR and western blots, respectively. Progesterone (P4) and estradiol (E2) levels were determined by enzyme immunoassays. Knockdown of c-Jun was achieved by lentivirus-mediated shRNA, and signaling pathways implicated in DHA-induced steroidogenesis were examined by western blots and dual-luciferase assays. DHA dose-dependently induced the expression of steroidogenic enzymes including 3β-HSD1, 17β-HSD1 and aromatase at both mRNA and protein levels, and subsequently increased the production of E2 but not P4. These effects were synergized by diethylmaleate, a glutathione-depleting compound, and α-tocopherol, a reducing agent, but robustly attenuated by inhibition of DHA transportation by phloretin or 2-deoxy-d-glucose. DHA time-dependently inhibited JNK and c-Jun phosphorylation, and dose-dependently reduced AP1 reporter activity. JNK signaling pathway-specific inhibitor SP600125 and c-Jun shRNA both significantly increased the expression of steroidogenic enzymes and E2 production regardless of the presence or absence of DHA. These findings suggest that DHA is able to induce steroidogenesis through inhibition of JNK/c-Jun/AP1 signaling, and may therefore play indispensable roles in pregnancy maintenance.

CAS / MDL: 141-05-9
研究领域: 内分泌学 · 细胞生物学 · 分子生物学 · 生殖生物学
✓ 已验证 产品关联 DOI PubMed 高影响因子
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