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1.
Int Urol Nephrol ; 56(4): 1449-1463, 2024 Apr.
Article in English | MEDLINE | ID: mdl-37815664

ABSTRACT

OBJECTIVE: The etiopathogenesis of diabetes nephropathy (DN) has not yet been fully clarified. Finding effective treatments to prevent renal failure in DN patients has become the main focus of research in recent years. Circular RNA (circRNA) has been shown to play a momentous role in DN progression. Based on this, we aimed to investigate the potential mechanism by which urine-derived stem cell (USC)-derived exosome circRNA ATG7 (Exo-ATG7) mediates DN progression. METHODS: Exosomes from USCs were isolated and identified. The DN rat model was established by intraperitoneally injecting 60 mg/kg streptozotocin. The protein expression levels were measured by Western blot and immunofluorescence. HE and Masson staining were used to evaluate renal injury, and the expression of related genes was detected by RT-qPCR. RESULTS: CircRNA ATG7 was significantly downregulated in the DN rat model, and the extracellular vesicles of USCs improved renal function and reduced inflammation in DN rats. However, after knocking down the USCs-derived exosome circRNA ATG7, improvement and therapeutic effect on renal function in DN rats were lost. In addition, overexpression of ATG7 facilitated the switching of macrophages from the pro-inflammatory M1 phenotype to the anti-inflammatory M2 phenotype both in vivo and in vitro. Mechanistically, upregulation of circRNA ATG7 expression can alleviate renal damage in DN rats. Importantly, the USCs-derived exosome circRNA ATG7 promotes macrophage M2 polarization by regulating the SOCS1/STAT3 signaling pathway through miR-4500. In addition, animal experiments also confirmed that after knocking down ATG7 in USC cells, the extracted exosome-treated DN rats could weaken the therapeutic effect of USC exosomes. CONCLUSION: Our research results indicate that USC-derived exosomal circRNA ATG7 facilitates macrophage phenotype switching from M1 to M2 through the SOCS1/STAT3 signaling pathway mediated by miR-4500, thereby inhibiting DN progression.


Subject(s)
Diabetes Mellitus , Diabetic Nephropathies , Exosomes , MicroRNAs , Animals , Humans , Rats , Diabetes Mellitus/metabolism , Diabetic Nephropathies/metabolism , Exosomes/metabolism , Macrophages , MicroRNAs/genetics , RNA, Circular/genetics , RNA, Circular/metabolism , RNA, Circular/pharmacology , Signal Transduction , STAT3 Transcription Factor , Stem Cells/metabolism , Suppressor of Cytokine Signaling 1 Protein/genetics , Suppressor of Cytokine Signaling 1 Protein/metabolism , Suppressor of Cytokine Signaling 1 Protein/pharmacology
2.
Macromol Biosci ; 23(9): e2300237, 2023 09.
Article in English | MEDLINE | ID: mdl-37337867

ABSTRACT

Macrophages modulate the wound healing cascade by adopting different phenotypes such as pro-inflammatory (M1) or pro-wound healing (M2). To reduce M1 activation, the JAK/STAT pathway can be targeted by using suppressors of cytokine signaling (SOCS1) proteins. Recently a peptide mimicking the kinase inhibitory region (KIR) of SOCS1 has been utilized to manipulate the adaptive immune response. However, the utilization of SOCS1-KIR to reduce pro-inflammatory phenotype in macrophages is yet to be investigated in a biomaterial formulation. This study introduces a PEGDA hydrogel platform to investigate SOCS1-KIR as a macrophage phenotype manipulating peptide. Immunocytochemistry, cytokine secretion assays, and gene expression analysis for pro-inflammatory macrophage markers in 2D and 3D experiments demonstrate a reduction in M1 activation due to SOCS1-KIR treatment. The retention of SOCS1-KIR in the hydrogel through release assays and diffusion tests is demonstrated. The swelling ratio of the hydrogel also remains unaffected with the entrapment of SOCS1-KIR. This study elucidates how SOCS1-KIR peptide in PEGDA hydrogels can be utilized as an effective therapeutic for macrophage manipulation.


Subject(s)
Janus Kinases , Macrophage Activation , Cytokines/metabolism , Janus Kinases/metabolism , Peptides/pharmacology , Peptides/metabolism , Signal Transduction , STAT Transcription Factors/metabolism , STAT Transcription Factors/pharmacology , Suppressor of Cytokine Signaling 1 Protein/metabolism , Suppressor of Cytokine Signaling 1 Protein/pharmacology , Suppressor of Cytokine Signaling Proteins/genetics , Suppressor of Cytokine Signaling Proteins/metabolism
3.
Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi ; 39(3): 220-229, 2023 Mar.
Article in Chinese | MEDLINE | ID: mdl-36946346

ABSTRACT

Objective To explore the effects of microRNA-155-5p (miR-155-5p) on lipopolysaccharide (LPS)-induced neuroinflammatory damage of human SH-SY5Y neuroblastoma cells. Methods SH-SY5Y cells line was overexpressed miR-155-5p or transfected with negative control (miR-155-5p mimic group, mimic-NC group), down-expressed miR-155-5p or transfected with its negative control (miR-155-5p inhibitor group, inhibitor-NC group). The cells with successful transfection in the above groups were treated with LPS for 24 hours. The cells without SH-SY5Y cells transfection and those with LPS treatment were included into control group and LPS group, respectively. The activity of SH-SY5Y cells was detected by MTT assay. The apoptosis rate was detected by flow cytometry. The mRNA levels of tumor necrosis factor α (TNF-α), interleukin 1ß (IL-1ß), interleukin 6 (IL-6) and interleukin 10 (IL-10), and expression of miR-155-5p were detected by reverse transcription PCR. The levels of cleaved caspase-3 (c-caspase-3), B-cell lymphoma/leukemia-2 (Bcl2), Bcl2-associated X protein (BAX), phosphorylated nuclear factor κB p65/nuclear factor κB p65 (p-NF-κB p65/NF-κB p65) and phosphorylated p38 mitogen-activated protein kinase/p38 mitogen-activated protein kinase (p-p38 MAPK/p38 MAPK) were detected by Western blot analysis. The expression of miR-155-5p in SH-SY5Y cells was regulated by miR-155-5p mimic and miR-155-5p inhibitor. The target relationship between miR-155-5p and suppressor of cytokine signaling 1(SOCS1) was predicted by bioinformatics, which was verified by luciferase assay. SH-SY5Y cells with down-regulation of both miR-155-5p and SOCS1 were constructed (miR-155-5p inhibitor/si-SOCS1 group). The cells activity, apoptosis, mRNA expressions of inflammatory cytokines, expression of SOCS1 protein, ratios of p-NF-κB p65/NF-κB p65 and p-p38 MAPK/p38 MAPK were detected by the above methods. Results Compared with control group, activity of SH-SY5Y cells, expression of Bcl2 protein, level of IL-10 mRNA and expression of SOCS1 protein decreased in LPS group while apoptosis rate, expressions of c-caspase-3 and BAX proteins, and levels of TNF-α, IL-1ß and IL-6 mRNA were increased, along with the increased miR-155-5p level and ratios of p-NF-κB p65/NF-κB p65 and p-p38 MAPK/p38 MAPK. The activity of SH-SY5Y cells, expression of Bcl2 protein, level of IL-10 mRNA and expression of SOCS1 protein increased in miR-155-5p inhibitor group, compared with LPS group, whereas decreased miR-155-5p level, apoptosis rate, expressions of c-caspase-3 and BAX proteins, levels of TNF-α, IL-1ß and IL-6 mRNA, and expressions of p-NF-κB p65/NF-κB p65 and p-p38 MAPK/p38 MAPK proteins were observed. Compared with LPS group, activity of SH-SY5Y cells, expression of Bcl2 protein, level of IL-10 mRNA and expression of SOCS1 protein were decreased in miR-155-5p mimic group, while miR-155-5p level, apoptosis rate, expressions of c-caspase-3 and BAX proteins, levels of TNF-α, IL-1ß and IL-6 mRNA, and ratios of p-NF-κB p65/NF-κB p65 and p-p38 MAPK/p38 MAPK proteins were increased. Targeted relationship was identified between miR-155-5p and SOCS1. Compared with miR-155-5p inhibitor group, cells activity and level of IL-10 mRNA decreased in miR-155-5p inhibitor/si-SOCS1 group, while apoptosis rate, ratios of p-NF-κB p65/NF-κB p65 and p-p38 MAPK/p38 MAPK, and levels of TNF-α, IL-1ß and IL-6 mRNA increased. Conclusion Inhibiting miR-155-5p can alleviate neuroinflammatory damage induced by LPS, which may be related to down-regulating SOCS1 level.


Subject(s)
MicroRNAs , Neuroblastoma , Humans , NF-kappa B/metabolism , Lipopolysaccharides/pharmacology , Interleukin-10/metabolism , Signal Transduction , bcl-2-Associated X Protein/metabolism , Caspase 3/metabolism , MicroRNAs/metabolism , Tumor Necrosis Factor-alpha/metabolism , Interleukin-6/metabolism , Suppressor of Cytokine Signaling 1 Protein/genetics , Suppressor of Cytokine Signaling 1 Protein/metabolism , Suppressor of Cytokine Signaling 1 Protein/pharmacology , Proto-Oncogene Proteins c-bcl-2/genetics , Proto-Oncogene Proteins c-bcl-2/metabolism , p38 Mitogen-Activated Protein Kinases/genetics , p38 Mitogen-Activated Protein Kinases/metabolism , RNA, Messenger
4.
Eur J Histochem ; 67(1)2023 01 02.
Article in English | MEDLINE | ID: mdl-36546418

ABSTRACT

Recurrent implantation failure (RIF) is defined as failure to achieve clinical pregnancy after at least 3 transfers of good-quality embryos by natural or artificial means. RIF is often a complex problem with a wide variety of etiologies and mechanisms as well as treatment options. In this study, using immunohistochemistry and Western blot, we demonstrated that the expression of leukemia inhibitory factor (LIF), Janus kinase 1 (JAK1), and signal transducer and activator of transcription 3 (STAT3) was increased, while that of suppressor of cytokine signaling 1 (SOCS1) was decreased in RIF patients. Growth hormone (GH) administration proved to have positive effects on embryo implantation in RIF patients, but the action mechanism of GH has not been elucidated yet. To this aim, we studied the effects of GH on the proliferation in vitro of endometrial adenocarcinoma Ishikawa cells. GH stimulated the expression of LIF and SOCS1, and through SOCS1 inhibits the expression of phosphorylated STAT3, and finally inhibits the occurrence of RIF. Excessive phosphorylation of STAT can lead to decreased endometrial receptivity and abnormal embryo implantation. We also examined the effects of LIF overexpression and an LIF inhibitor (EC330) on the JAK/STAT pathway. LIF promoted cell proliferation, and the up-regulation of LIF increased the expression of SOCS1 and JAK1/STAT3 pathway-related genes in Ishikawa cells. As GH can inhibit the JAK1/STAT3 pathway through LIF, we hypothesize that upregulating SOCS1 may be a potential approach to treat RIF at the molecular level. GH can inhibit the JAK1/STAT3 pathway through LIF, up-regulating SOCS1 to treat RIF at the molecular level.


Subject(s)
Growth Hormone , Signal Transduction , Pregnancy , Female , Humans , Growth Hormone/metabolism , Growth Hormone/pharmacology , Janus Kinases/metabolism , Janus Kinases/pharmacology , STAT3 Transcription Factor/metabolism , STAT Transcription Factors/metabolism , STAT Transcription Factors/pharmacology , Suppressor of Cytokine Signaling 1 Protein/metabolism , Suppressor of Cytokine Signaling 1 Protein/pharmacology
5.
Phytother Res ; 36(11): 4230-4243, 2022 Nov.
Article in English | MEDLINE | ID: mdl-35817562

ABSTRACT

Wogonoside (WG) is a flavonoid chemical component extracted from Scutellaria baicalensis, which exerts therapeutic effects on liver diseases. Ferroptosis, a novel form of programmed cell death, regulates diverse physiological/pathological processes. In this study, we attempted to investigate a novel mechanism by which WG mitigates liver fibrosis by inducing ferroptosis in hepatic stellate cells (HSCs). A CCl4 -induced mouse liver fibrosis model and a rat HSC line were employed for in vivo and in vitro experiments, both treated with WG. Firstly, the levels of the fibrotic markers α-smooth muscle actin (α-SMA) and α1(I)collagen (COL1α1) were effectively decreased by WG in CCl4 -induced mice and HSC-T6 cells. Additionally, mitochondrial condensation and mitochondrial ridge breakage were observed in WG-treated HSC-T6 cells. Furthermore, ferroptotic events including depletion of SLC7A11, GPX4 and GSH, and accumulation of iron, ROS and MDA were discovered in WG-treated HSC-T6 cells. Intriguingly, these ferroptotic events did not appear in hepatocytes or macrophages. WG-elicited HSC ferroptosis and ECM reduction were dramatically abrogated by ferrostatin-1 (Fer-1), a ferroptosis inhibitor. Importantly, our results confirm that SOCS1/P53/SLC7A11 is a signaling pathway which promotes WG attenuation of liver fibrosis. On the contrary, WG mitigated liver fibrosis and inducted HSC-T6 cell ferroptosis were hindered by SOCS1 siRNA and pifithrin-α (PFT-α). These findings demonstrate that SOCS1/P53/SLC7A11-mediated HSC ferroptosis is associated with WG alleviating liver fibrosis, which provides a new clue for the treatment of liver fibrosis.


Subject(s)
Ferroptosis , Hepatic Stellate Cells , Animals , Mice , Rats , Liver , Liver Cirrhosis/drug therapy , Suppressor of Cytokine Signaling 1 Protein/metabolism , Suppressor of Cytokine Signaling 1 Protein/pharmacology , Suppressor of Cytokine Signaling 1 Protein/therapeutic use , Tumor Suppressor Protein p53/metabolism
6.
Sci Rep ; 11(1): 6354, 2021 03 18.
Article in English | MEDLINE | ID: mdl-33737712

ABSTRACT

Autoimmune diseases are driven largely by a pathogenic cytokine milieu produced by aberrantly activated lymphocytes. Many cytokines, including interferon gamma (IFN-γ), utilize the JAK/STAT pathway for signal propagation. Suppressor of Cytokine Signaling-1 (SOCS1) is an inducible, intracellular protein that regulates IFN-γ signaling by dampening JAK/STAT signaling. Using Fas deficient, MRL/MpJ-Faslpr/J (MRL/lpr) mice, which develop lupus-like disease spontaneously, we tested the hypothesis that a peptide mimic of the SOCS1 kinase inhibitory region (SOCS1-KIR) would inhibit lymphocyte activation and modulate lupus-associated pathologies. Consistent with in vitro studies, SOCS1-KIR intraperitoneal administration reduced the frequency, activation, and cytokine production of memory CD8+ and CD4+ T lymphocytes within the peripheral blood, spleen, and lymph nodes. In addition, SOCS1-KIR administration reduced lymphadenopathy, severity of skin lesions, autoantibody production, and modestly reduced kidney pathology. On a cellular level, peritoneal SOCS1-KIR administration enhanced Foxp3 expression in total splenic and follicular regulatory T cells, reduced the effector memory/naïve T lymphocyte ratio for both CD4+ and CD8+ cells, and reduced the frequency of GL7+ germinal center enriched B cells. Together, these data show that SOCS1-KIR treatment reduced auto-reactive lymphocyte effector functions and suggest that therapeutic targeting of the SOCS1 pathway through peptide administration may have efficacy in mitigating autoimmune pathologies.


Subject(s)
Autoimmune Diseases/drug therapy , Forkhead Transcription Factors/genetics , Lupus Erythematosus, Systemic/drug therapy , Peptides/pharmacology , Suppressor of Cytokine Signaling 1 Protein/genetics , Animals , Autoimmune Diseases/genetics , Autoimmune Diseases/immunology , Autoimmune Diseases/pathology , B-Lymphocytes/drug effects , Biomimetics , CD4-Positive T-Lymphocytes/drug effects , CD8-Positive T-Lymphocytes/drug effects , Cytokines/genetics , Interferon-gamma/genetics , Janus Kinases/genetics , Lupus Erythematosus, Systemic/genetics , Lupus Erythematosus, Systemic/immunology , Lymph Nodes/drug effects , Lymph Nodes/immunology , Lymphocytes/drug effects , Lymphocytes/immunology , Mice, Inbred MRL lpr , Peptides/chemical synthesis , STAT Transcription Factors/genetics , Spleen/drug effects , Spleen/immunology , Suppressor of Cytokine Signaling 1 Protein/pharmacology , T-Lymphocytes, Regulatory/drug effects , T-Lymphocytes, Regulatory/immunology , fas Receptor/genetics
7.
Int J Mol Sci ; 20(15)2019 Jul 24.
Article in English | MEDLINE | ID: mdl-31344857

ABSTRACT

Current treatments for diabetic retinopathy (DR) target late stages when vision has already been significantly affected. Accumulating evidence suggests that neuroinflammation plays a major role in the pathogenesis of DR, resulting in the disruption of the blood-retinal barrier. Suppressors of cytokine signaling (SOCS) are cytokine-inducible proteins that function as a negative feedback loop regulating cytokine responses. On this basis, the aim of the present study was to evaluate the effect of a SOCS1-derived peptide administered by eye drops (2 weeks) on retinal neuroinflammation and early microvascular abnormalities in a db/db mouse model. In brief, we found that SOCS1-derived peptide significantly reduced glial activation and neural apoptosis induced by diabetes, as well as retinal levels of proinflammatory cytokines. Moreover, a significant improvement of electroretinogram parameters was observed, thus revealing a clear impact of the histological findings on global retinal function. Finally, SOCS1-derived peptide prevented the disruption of the blood-retinal barrier. Overall, our results suggest that topical administration of SOCS1-derived peptide is effective in preventing retinal neuroinflammation and early microvascular impairment. These findings could open up a new strategy for the treatment of early stages of DR.


Subject(s)
Diabetes Mellitus, Experimental/drug therapy , Diabetic Retinopathy/drug therapy , Inflammation/drug therapy , Suppressor of Cytokine Signaling 1 Protein/pharmacology , Animals , Diabetic Retinopathy/genetics , Diabetic Retinopathy/pathology , Disease Models, Animal , Electroretinography , Humans , Inflammation/genetics , Inflammation/pathology , Mice , Ophthalmic Solutions/pharmacology , Peptides/chemistry , Peptides/pharmacology , Retina/drug effects , Retina/pathology , Suppressor of Cytokine Signaling 1 Protein/chemistry
8.
Exp Eye Res ; 177: 12-22, 2018 12.
Article in English | MEDLINE | ID: mdl-30048621

ABSTRACT

We describe an immunosuppressive peptide corresponding to the kinase inhibitory region (KIR) of the intracellular checkpoint protein suppressor of cytokine signaling 1 (SOCS-1) that binds to the phospho-tyrosine containing regions of the tyrosine kinases JAK2 and TYK2 and the adaptor protein MAL, and thereby inhibits signaling downstream from these signaling mediators. The peptide, SOCS1-KIR, is thus capable of downregulating overactive JAK/STAT or NF-kB signaling in somatic cells, including those in many compartments of the eye. Attachment of poly-arginine to this peptide (R9-SOCS1-KIR) allows it to penetrate the plasma membrane in aqueous media. R9-SOCS1-KIR was tested in ARPE-19 cells and was found to attenuate mediators of inflammation by blocking the inflammatory effects of IFNγ, TNFα, or IL-17A. R9-SOCS1-KIR and also protected against TNFα or IL-17A mediated damage to the barrier properties of ARPE-19 cells, as evidenced by immunostaining with the tight junction protein, zona occludin 1 (ZO-1), and measurement of transepithelial electrical resistance (TEER). Experimental autoimmune uveitis (EAU) was generated in B10. RIII mice using a peptide of interphotoreceptor retinal binding protein (IRBP161-180) as immunogen. Topical administration of R9-SOCS1-KIR, 2 days before (prophylactic), or 7 days after immunization (therapeutic) protected ocular structure and function as seen by fundoscopy, optical coherence tomography (OCT), and electroretinography (ERG). The ability R9-SOCS1-KIR to suppress ocular inflammation and preserve barrier properties of retinal pigment epithelium makes it a potential candidate for treatment of autoimmune uveitis.


Subject(s)
Autoimmune Diseases/drug therapy , Eye Proteins/pharmacology , Immunosuppressive Agents/pharmacology , Protein Kinase Inhibitors/pharmacology , Suppressor of Cytokine Signaling 1 Protein/pharmacology , Uveitis/drug therapy , Animals , Autoimmune Diseases/immunology , Cell-Penetrating Peptides , Disease Models, Animal , Interleukin-17/metabolism , Mice , Tumor Necrosis Factor-alpha/metabolism , Uveitis/immunology
9.
Inflammation ; 41(4): 1557-1567, 2018 Aug.
Article in English | MEDLINE | ID: mdl-29907905

ABSTRACT

Smoke inhalation leads to acute lung injury (ALI), a devastating clinical problem associated with high mortality rates. Suppressor of cytokine signaling-1 (SOCS-1) is a negative regulator of proinflammatory cytokine signaling. We have found that adenoviral gene transfer of SOCS-1 ameliorates smoke inhalation-induced lung injury in C57BL/6 mice. We also found that the release of adenosine triphosphate (ATP) was increased post smoke exposure, while oxidized ATP, an inhibitor of purinergic P2X7 receptor, suppressed smoke-induced NALP3 inflammasome assembly, caspase-1 activation, and K+ efflux. Similar to oxidized ATP, high protein level of SOCS-1 dampened the formation of NALP3 inflammasome and the activation of caspase-1 and IL-1ß induced by smoke exposure in mouse alveolar macrophages. In conclusion, SOCS-1 relieves smoke inhalation-induced pulmonary inflammation and injury by inhibiting NALP3 inflammasome formation.


Subject(s)
Acute Lung Injury/chemically induced , Inflammasomes/antagonists & inhibitors , Pneumonia , Smoke/adverse effects , Suppressor of Cytokine Signaling 1 Protein/pharmacology , Animals , Mice , Mice, Inbred C57BL , NLR Family, Pyrin Domain-Containing 3 Protein , Suppressor of Cytokine Signaling 1 Protein/administration & dosage , Suppressor of Cytokine Signaling 1 Protein/therapeutic use , Suppressor of Cytokine Signaling Proteins
10.
Int J Cancer ; 140(11): 2608-2621, 2017 06 01.
Article in English | MEDLINE | ID: mdl-28233302

ABSTRACT

Chronic inflammation is involved in cancer growth in esophageal squamous cell carcinoma (ESCC), which is a highly refractory cancer with poor prognosis. This study investigated the antitumor effect and mechanisms of SOCS1 gene therapy for ESCC. Patients with ESCC showed epigenetics silencing of SOCS1 gene by methylation in the CpG islands. We infected 10 ESCC cells with an adenovirus-expressing SOCS1 (AdSOCS1) to examine the antitumor effect and mechanism of SOCS1 overexpression. SOCS1 overexpression markedly decreased the proliferation of all ESCC cell lines and induced apoptosis. Also, SOCS1 inhibited the proliferation of ESCC cells via multiple signaling pathways including Janus kinase (JAK)/signal transducer and activator of transcription (STAT) and focal adhesion kinase (FAK)/p44/42 mitogen-activated protein kinase (p44/42 MAPK). Additionally, we established two xenograft mouse models in which TE14 ESCC cells or ESCC patient-derived tissues (PDX) were subcutaneously implanted. Mice were intra-tumorally injected with AdSOCS1 or control adenovirus vector (AdLacZ). In mice, tumor volumes and tumor weights were significantly lower in mice treated with AdSOCS1 than that with AdLacZ as similar mechanism to the in vitro findings. The Ki-67 index of tumors treated with AdSOCS1 was significantly lower than that with AdLacZ, and SOCS1 gene therapy induced apoptosis. These findings demonstrated that overexpression of SOCS1 has a potent antitumor effect against ESCC both in vitro and in vivo including PDX mice. SOCS1 gene therapy may be a promising approach for the treatment of ESCC.


Subject(s)
Antineoplastic Agents/pharmacology , Carcinoma, Squamous Cell/drug therapy , Carcinoma, Squamous Cell/genetics , Esophageal Neoplasms/drug therapy , Esophageal Neoplasms/genetics , Suppressor of Cytokine Signaling 1 Protein/genetics , Suppressor of Cytokine Signaling 1 Protein/pharmacology , Animals , Apoptosis/drug effects , Apoptosis/genetics , Cell Line, Tumor , Cell Proliferation/drug effects , Cell Proliferation/genetics , Esophageal Squamous Cell Carcinoma , Female , Genetic Therapy/methods , Humans , Janus Kinases/genetics , Mice , Mice, Inbred ICR , Mice, Nude , Signal Transduction/drug effects , Signal Transduction/genetics , Xenograft Model Antitumor Assays/methods
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