PURPOSE: The genetic alteration of the janus kinases (JAKs), non-receptor tyrosine kinase, is related to the development of human cancers. However, little is known about how the sequence variation of JAK3 contributes to the development of lung cancer. This study investigated whether polymorphisms at the promoter region of the JAK3 gene are associated with the risk of lung cancer in the Korean population. MATERIALS AND METHODS: A total of 819 subjects, including 409 lung cancer patients and 410 healthy controls were recruited. The SNaPshot assay and polymerase chain reaction-restriction fragment length polymorphism analysis were used, and logistic regression analyses were performed to characterize the association between polymorphisms of JAK3 and lung cancer risk. RESULTS: Three polymorphisms (-672 G>A, +64 A>G and +227 G>A) of JAK3 were analyzed for large-scale genotyping (n=819). Statistical analyses revealed that polymorphisms and haplotypes in the JAK3 gene were not significantly associated with lung cancer. CONCLUSION: JAK3 gene was not significantly associated with the risk of lung cancer in the Korean population.
Haplotypes ; Humans ; Janus Kinase 3 ; Janus Kinases ; Korea ; Logistic Models ; Lung ; Lung Neoplasms ; Promoter Regions, Genetic ; Protein-Tyrosine Kinases

Common Variable Immunodeficiency/genetics* ; Humans ; Janus Kinase 3/genetics* ; Mutation ; Severe Combined Immunodeficiency

OBJECTIVETo study the inhibitive effect of exogenous carbon monoxide-releasing molecules 2 (CORM-2) on the activation of Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway in sepsis.

METHODSRAW264.7 cells were divided into normal control group, LPS group (10 mg/mL LPS, the same concentration below), LPS + inactive CORM-2 (iCORM-2) group, LPS + 50 mmol/L CORM-2 group, and LPS + 100 mmol/L CORM-2 group. TNF-alpha level in the supernatant was determined with ELISA, and the phosphorylation levels of JAK1 and JAK3 were determined with Western blot. Thirty-five male BALB/c mice were divided into normal control group, cecal ligation and puncture (CLP) group, CLP + iCORM-2 (8.0 mg/kg) group and CLP + CORM-2 group (8.0 mg/kg) according to the random number table. Mice in CLP + CORM-2 group were treated the same as mice in CLP group except for administration of CORM-2 after CLP. The plasma levels of TNF-alpha, IL-1beta, and the phosphorylation levels of JAK1, JAK3 in liver tissue were determined with ELISA 24 hours post CLP. Data were processed with t test.

RESULTSCompared with that of normal control group [(1.9 +/- 0.3) pg/mL], the TNF-alpha level [(8.2 +/- 2.7) pg/mL, t = 2.844, P < 0.01] and phosphorylation levels of JAK1, JAK3 in LPS group increased significantly; while TNF-alpha levels in LPS + 50 mmol/L CORM-2 and LPS + 100 mmol/L CORM-2 groups decreased obviously as compared with that of LPS group [(5.7 +/- 1.4), (3.2 +/- 0.9) pg/mL, with t value respectively 2.104 and 2.363, P values all below 0.05], and it was the same with phosphorylation levels of JAK1, JAK3 in a dose-dependent manner. Compared with those of normal control group, plasma levels of TNF-alpha and IL-1beta and phosphorylation levels of JAK1, JAK3 in liver tissue significantly increased in CLP group (with t value respectively 2.916 and 2.796, and P values all below 0.05); while plasma levels of TNF-alpha and IL-1beta and the phosphorylation levels of JAK1, JAK3 in liver tissue decreased significantly in CLP + CORM-2 group (with t value respectively 2.115 and 2.398, and P values all below 0.05).

CONCLUSIONSExogenous CORM-2 can obviously inhibit the phosphorylation of JAKs molecules and then inhibit the activation of JAK/STAT signal pathway in sepsis, and decrease the expression of downstream cytokines to effectively prevent cascade reaction in the inflammatory response after severe infection.

Animals ; Carbon Monoxide ; pharmacology ; Cells, Cultured ; Interleukin-1beta ; blood ; Janus Kinase 1 ; metabolism ; Janus Kinase 3 ; metabolism ; Male ; Mice ; Mice, Inbred BALB C ; Organometallic Compounds ; pharmacology ; Phosphorylation ; Sepsis ; metabolism ; Signal Transduction ; Tumor Necrosis Factor-alpha ; blood

The present study was aimed to investigate the effect of Janus kinase 3 (JAK3) on the migration of breast cancer cells and the underlying mechanism. The expression of JAK3 in breast cancer MCF-7 cells was silenced by siRNA (siJAK3). The migration ability of MCF-7 cells was detected by scratch test. The activity of store-operated calcium channel (SOCC) was detected by fluorescence calcium imaging. The expression levels of Orai1 and STIM1, key molecules in the process of store-operated calcium entry (SOCE) were detected by Western blot and RT-PCR. The results showed that 2-APB, an inhibitor of SOCC, could inhibit the migration ability of MCF-7 cells. siJAK3 transfection significantly inhibited the migration ability of MCF-7 cells, decreased the activity of SOCC, and down-regulated mRNA and protein expression levels of Orai1 and Stim1. Over-expression of Orai1 or STIM1 in JAK3-silenced cells restored their migration ability. These results suggest that JAK3 facilitates the migration of breast cancer cells by SOCC.
Breast Neoplasms ; enzymology ; Calcium ; metabolism ; Calcium Channels ; metabolism ; Cell Movement ; physiology ; Gene Expression Regulation, Neoplastic ; Humans ; Janus Kinase 3 ; genetics ; metabolism ; MCF-7 Cells ; ORAI1 Protein ; genetics

Based on the Janus kinase 2/signal transducer and activator of transcription 3(JAK2/STAT3) signaling pathway, this study investigated the effect of medicated serum of Sparganii Rhizoma(SR) and Curcumae Rhizoma(CR) on the proliferation, apoptosis, migration, and secretion of inflammatory factors of ectopic endometrial stromal cells(ESCs). Specifically, human ESCs were primary-cultured. The effect of different concentration(5%, 10%, 20%) of SR-, CR-, and SR-CR combination-medicated serum, and AG490 solution(50 μmol·L~(-1)) on the proliferation of ESCs was detected by methyl thiazolyl tetrazolium(MTT) assay, and the optimal dose was selected accordingly for further experiment. The cells were classified into normal serum(NS) group, SR group(10%), CR group(10%), combination(CM) group(10%), and AG490 group. The apoptosis level of ESCs was detected by flow cytometry, and the migration ability was examined by wound healing assay. The secretion of interleukin(IL)-1β, IL-6, and tumor necrosis factor(TNF)-α was determined by enzyme-linked immunosorbent assay(ELISA). The protein levels of cysteinyl aspartate specific protei-nase-3(caspase-3), B-cell lymphoma(Bcl-2), and Bcl-2-associated X protein(Bax) and the levels of phosphorylated(p)-JAK2 and p-STAT3 were detected by Western blot. The results showed that the viability of ESCs cells was lowered in the administration groups compared with the blank serum group(P<0.01), especially the 10% drug-medicated serum, which was selected for further experiment. The 10% SR-medicated serum, 10% CR-medicated serum, and 10% CM-medicated serum could increase the apoptosis rate(P<0.01), up-regulate the protein expression of caspase-3 and Bax in cells(P<0.05 or P<0.01), down-regulate the expression of Bcl-2(P<0.01), decrease the cell migration rate(P<0.05 or P<0.01), and reduce the secretion levels of IL-1β, IL-6, and TNF-α(P<0.05 or P<0.01), and levels of p-JAK2 and p-STAT3(P<0.05 or P<0.01). Compared with the SR and CR groups, CM group showed low cell viability(P<0.01), high protein expression of caspase-3 and Bax(P<0.05 or P<0.01), and low protein expression of Bcl-2 and p-JAK2(P<0.05). After incubation with CM, the apoptosis rate was higher(P<0.05) and the migration rate was lower(P<0.01) than that of the CR group. The p-STAT3 protein level of CM group was lower than that of the RS group(P<0.05). The mechanism of SR, CR, and the combination underlying the improvement of endometriosis may be that they blocked JAK2/STAT3 signaling pathway, inhibited ESC proliferation, promoted apoptosis, weakened cell migration, and reduced the secretion of inflammatory factors. The effect of the combination was better than that of RS alone and CR alone.
Female ; Humans ; Janus Kinase 2 ; Caspase 3 ; bcl-2-Associated X Protein ; Interleukin-6/genetics* ; Apoptosis ; Signal Transduction ; Cell Proliferation ; STAT3 Transcription Factor/genetics*

Adolescent ; Adult ; Aged ; Female ; Humans ; Janus Kinase 2 ; genetics ; Karyotyping ; Male ; Middle Aged ; Mutation ; Myelodysplastic Syndromes ; genetics ; Nuclear Proteins ; genetics ; Proto-Oncogene Proteins c-kit ; genetics ; Young Adult ; fms-Like Tyrosine Kinase 3 ; genetics

This study was purposed to explore the effects of a methylation inhibitor arsenic trioxide (As2O3, ATO) and 5-Aza-2'-deoxycytidine (5-aza-CdR) on the expression of JAK-STAT signal transduction pathway in family members JAK3, TYK2 and hematopoietic cell phosphatase SHP-1 in chronic myeloid leukemia cell line K562 and their roles in pathogenesis of leukemia. The K562 cells were divided into 3 groups:single drug-treated group, combined 2 drugs-treated group, group without drug treatment as control. The concentration of 5-aza-CdR were 0.5, 1, 2 µmol/L; the concentration of ATO was 1, 2.5, 5 µmol/L; the concentration of combined drugs was ATO 1 µmol/L + 5-aza-CdR 0.5 µmol/L, ATO 2.5 µmol/L + 5-aza-CdR 1 µmol/L, and ATO 5 µmol/L + 5-aza-CdR 2 µmol/L. The K562 cells were treated with above-mentioned concentration of drugs for 24, 48 and 72 hours, then the total RNA of cells was extracted, the JAK3, TYK2 and SHP-1 expressions were detected by real-time quantitative-PCR. The results showed that after the K562 cells were treated with ATO and 5-aza-CdR alone and their combination, the expression of SHP-1 mRNA increased, the expressions of JAK3 mRNA and TYK2 mRNA decreased along with increasing of concentration and prolonging of time, displaying the concentration and time-dependency. The SHP-1 negatively related with JAK3 and TYK2. The effect of SHP-1 on JAK3 was significantly higher than that on TYK2. It is concluded that when the K562 cells are treated with ATO and 5-aza-CdR alone and their combination, the expression of SHP-1 is up-regulated and the expressions of JAK3, TYK2 are down-regulated in concentration-and time-dependent manners, moreover the ATO and 5-aza-CdR show synergies demethylation effect. The SHP-1 gene exert effect possibly through inhibiting the JAK/STAT pathway, the JAK3 is affected more than TYK2, the JAK3 may exert more important role in TAK/STAT pathway.
Arsenicals ; pharmacology ; Azacitidine ; administration & dosage ; analogs & derivatives ; pharmacology ; DNA Methylation ; Gene Expression Regulation, Leukemic ; drug effects ; Humans ; Janus Kinase 3 ; metabolism ; K562 Cells ; Oxides ; pharmacology ; Protein Tyrosine Phosphatase, Non-Receptor Type 6 ; metabolism ; TYK2 Kinase ; metabolism

This study was aimed to investigate the status of c-KIT, Fms-like tyrosine kinase 3 (FLT3) and Janus kinase 2 (JAK2) mutations in acute myeloid leukemia (AML) patients with t (8; 21) and to analyze their relation to clinical feature and prognosis. PCR, AS-PCR, restriction and sequencing methods were used respectively to detect the FLT3, JAK 2 and c-KIT mutations in 8 cases of de novo AML with t (8; 21) and 6 cases of relapsed AML with t (8; 21). The results showed that the c-KIT mutation was found in 2 cases out of 14 AML patients with t (8; 21) (14.3%), among them 1 case had c-KIT D816V mutation, the other had c-KIT D816Y mutation. The FLT3-ITD mutation was detect in 1 out of 14 patients (7.1%), but JAK2 mutation could not be detected in all 14 cases. In conclusion, tyrosine kinase mutation relates to AML with t (8; 21), patients with tyrosine kinase mutation may have higher relapse, extramedullary infiltration and poor prognosis. The screening c-KIT, FLT3 mutations may play an important role in evaluating prognosis and guiding treatment of t (8; 21) AML.
Adolescent ; Adult ; Child ; Child, Preschool ; Female ; Humans ; Janus Kinase 2 ; genetics ; Leukemia, Myeloid, Acute ; genetics ; Male ; Middle Aged ; Mutation ; Proto-Oncogene Proteins c-kit ; genetics ; Tandem Repeat Sequences ; Young Adult ; fms-Like Tyrosine Kinase 3 ; genetics

Specific gene expressions of host cells by spontaneous STAT6 phosphorylation are major strategy for the survival of intracellular Toxoplasma gondii against parasiticidal events through STAT1 phosphorylation by infection provoked IFN-γ. We determined the effects of small molecules of tyrosine kinase inhibitors (TKIs) on the growth of T. gondii and on the relationship with STAT1 and STAT6 phosphorylation in ARPE-19 cells. We counted the number of T. gondii RH tachyzoites per parasitophorous vacuolar membrane (PVM) after treatment with TKIs at 12-hr intervals for 72 hr. The change of STAT6 phosphorylation was assessed via western blot and immunofluorescence assay. Among the tested TKIs, Afatinib (pan ErbB/EGFR inhibitor, 5 µM) inhibited 98.0% of the growth of T. gondii, which was comparable to pyrimethamine (5 µM) at 96.9% and followed by Erlotinib (ErbB1/EGFR inhibitor, 20 µM) at 33.8% and Sunitinib (PDGFR or c-Kit inhibitor, 10 µM) at 21.3%. In the early stage of the infection (2, 4, and 8 hr after T. gondii challenge), Afatinib inhibited the phosphorylation of STAT6 in western blot and immunofluorescence assay. Both JAK1 and JAK3, the upper hierarchical kinases of cytokine signaling, were strongly phosphorylated at 2 hr and then disappeared entirely after 4 hr. Some TKIs, especially the EGFR inhibitors, might play an important role in the inhibition of intracellular replication of T. gondii through the inhibition of the direct phosphorylation of STAT6 by T. gondii.
Antiparasitic Agents/pharmacology ; Blotting, Western ; Cell Line ; Enzyme Activation/drug effects ; Fluorescent Antibody Technique ; Humans ; Janus Kinase 1/metabolism ; Janus Kinase 3/metabolism ; Phosphorylation/drug effects ; Quinazolines/*pharmacology ; STAT6 Transcription Factor/*metabolism ; Signal Transduction/*drug effects ; Toxoplasma/*drug effects/physiology ; Toxoplasmosis/physiopathology

PURPOSE: IGFBP-3 leads to the induction of insulin resistance in 3T3-L1 adipocytes. We carried out a series of experiments to elucidate the effects of IGFBP-3 on adipokines and gene expressions. METHODS: We treated fully-differentiated 3T3-L1 adipocytes with IGFBP-3 (0.5, 1, and 2 microg/mL) for one day and measured the mRNA levels of adiponectin, leptin, resistin, and TNF-alpha by RT-PCR, and adiponectin, leptin, resistin, and IL-6 protein levels in the culture supernatant were measured using multiplex adipokine assay ELISA Kits (Linco Research, St. Charles, Missouri). Gene expression in 3T3-L1 adipocyte cells using a microarray method was performed. RESULTS: IGFBP-3 inhibited the expression of adiponectin, leptin, resistin, and TNF-alpha mRNA. IGFBP-3 at 0.5 and 1 micro/mL decreased adiponectin release, but IL-6 release was increased at 2 micro/mL IGFBP-3. A dose-dependent inhibition of leptin was released by IGFBP-3 at 50%. Resistin release was decreased by 40%. The effect of IGFBP-3 on the gene expression in 3T3-L1 adipocyte cells using a microarray assay related to an increase of agouti-realted proteins (Agrp) and Janus kinase 2 (JAK2), and a decrease of the ras homolog gene family (Rhoq), acyl-CoA synthetase long-chain family member 6 (Acsl6), and the interleukin-1 receptor-associated kinase 1 (Irak1). CONCLUSION: IGFBP-3 regulates several adipokines gene expressions that are known to modulate insulin sensitivity, and this regulation may be attributable to the insulin resistance effect of IGFBP-3 on adipocytes.
Adipocytes ; Adipokines ; Adiponectin ; Enzyme-Linked Immunosorbent Assay ; Gene Expression ; Humans ; Insulin Resistance ; Insulin-Like Growth Factor Binding Protein 3 ; Interleukin-1 Receptor-Associated Kinases ; Interleukin-6 ; Janus Kinase 2 ; Leptin ; Ligases ; Proteins ; Resistin ; RNA, Messenger ; Tumor Necrosis Factor-alpha