Anti-dsDNA antibodies induce inflammation via endoplasmic reticulum stress in human mesangial cells
- Hui Zhang†1,
- Chunmei Zhao†1, 2,
- Shuang Wang1,
- Yuefang Huang3,
- Hongyue Wang1,
- Jijun Zhao1 and
- Niansheng Yang1Email author
© Zhang et al. 2015
Received: 5 November 2014
Accepted: 14 May 2015
Published: 4 June 2015
Anti-dsDNA antibodies play an important role in the pathogenesis of lupus nephritis (LN). Endoplasmic reticulum (ER) stress is a physical reaction under stressful condition and can cause inflammation when stimulation is sustained. This study investigated the roles of ER stress in anti-dsDNA antibody-induced inflammation response in human mesangial cells (HMCs).
Anti-dsDNA antibodies isolated from LN patients were used to stimulate HMCs. The expression of GRP78, PERK, p-PERK, p-eIF2α, ATF4, p-IRE1α, ATF6 and CHOP in HMCs was measured by western blot. NF-κB activation was detected by examining nuclear translocation of NF-κB p65. The expression and production of IL-1β, TNF-α and MCP-1 were examined by qPCR and ELISA.
Flow cytometry and cellular ELISA showed that anti-dsDNA antibodies can bind to HMCs. The binding was not inhibited by blockage of Fc receptor. Anti-dsDNA antibody stimulation significantly enhanced the expression of GRP78, p-PERK, p-eIF2α and ATF4 in HMCs. However, no significant increase in the expression of p-IRE1α and ATF6 was found. In addition, anti-dsDNA antibodies also significantly increased the activation of NF-κB and upregulated the expression of IL-1β, TNF-α and MCP-1, which were suppressed by pretreatment of HMCs with chemical ER stress inhibitor 4-PBA. Transfection of specific ATF4 siRNA also significantly reduced the activation of NF-κB and expression of proinflammatory cytokines.
Anti-dsDNA antibodies induce NF-κB activation and inflammation in HMCs via PERK-eIF2α-ATF4 ER stress pathway.
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by production of auto-antibodies . Kidney is one of the most frequently involved organs in SLE. Deposition of auto-antibodies in the kidneys triggers inflammation resulting in lupus nephritis (LN), which may progress to end-stage renal failure .
Anti-double-stranded DNA (anti-dsDNA) antibodies are the hallmark auto-antibodies in SLE and correlated with disease activities of LN . Previous study showed that monoclonal anti-dsDNA antibody stimulated the expression and release of inflammatory cytokines from normal human mononuclear cells . Anti-dsDNA antibodies can also bind to human mesangial cell (HMCs) and cause inflammation . However, the specific pathogenesis of anti-dsDNA antibodies in LN remains unclear.
Endoplasmic reticulum (ER) is recognized as a site for biosynthesis, folding, assembly, modification and degradation of proteins in the state of physiology . ER stress is defined as accumulation of unfolded or misfolded proteins in the ER lumen. When the demand for ER function is over its capacity, ER stress arises . In respond to ER stress, unfolded protein response (UPR) pathway was activated to prevent such accumulation in the ER lumen to cope with the stressful conditions [8, 9]. It is now recognized that three ER-localized transmembrane signal transducers including protein kinases IRE1 (inositol-requiring kinase 1), PERK (double-stranded RNA-activated protein kinase-like ER kinase), and the transcription factor ATF6 (activating transcription factor 6) can be activated to initiate adaptive responses in response to ER stress . PERK is one of the three localized transmenbrane transducers. Released from Bip, PERK homodimerization and phosphorylation can phosphorylate eIF2α. The phosphorylation of eIF2α subsequently activates the transcription factor ATF4. At last, ATF4 induces the expression of UPR target genes, which are involved in oxidative stress response and inflammation .
Accumulating evidences indicate that ER stress has a close relation with inflammation and autoimmunity [12, 13]. NF-κB is a key transcription factor that has a central role in the initiation of inflammation . NF-κB remains in cytoplasm in an inactive state and translocates into the nucleus once activated, inducing the transcription of numerous inflammation-associated genes . It has been reported that NF-κB can be activated in response to ER stress , implying that ER stress might cause inflammation through activating NF-κB. In addition, the activation of NF-κB is involved in the pathogenesis of glomerulonephritis, including LN . Extensive upregulation of NF-κB in renal tubular and interstitial cells was observed in LN .
It has been demonstrated that ER stress played important roles in glomerular and tubular damages in kidney diseases . In experimental models of membranoproliferative glomerulonephritis and membranous nephropathy, ER stress has been described in glomerular cells . However, the roles of ER stress in LN remained undefined. In this report, we demonstrated that anti-dsDNA antibodies from LN patients bound to HMCs, inducing ER stress and activated NF-κB through PERK-eIF2α-ATF4 ER stress pathway.
Patients and isolation of polyclonal anti-dsDNA antibodies or healthy serum IgG
HMCs (Science II, USA) were cultured in RMPI1640 culture medium containing 10% fetal bovine serum (FBS). Cells were maintained at 37°C in 5% CO2 in a humidified cell culture incubator. The media were changed every other day. HMCs were used for all experiments when cultured up to 90% confluence and incubated with serum-free medium for up to 12 h prior to use. Cells were plated in 60 mm culture dishes and stimulated with 100 nM of thapsigargin (TG, Sigma, USA), 10 μg/ml of anti-dsDNA antibodies, 10 μg/ml of normal human IgG, or medium alone for selected duration. In some experiments, 10 mM of 4-PBA (Sigma, USA) was included. The number of viable cells was assessed by trypan blue (trypan blue exclusion >90%).
Detection the binding of anti-dsDNA antibodies to HMCs by flow cytometry
HMCs were grown up to 90% confluence and harvested. Cells (1 × 106) were incubated with 20 μg/ml of anti-dsDNA antibodies from LN patients or IgG from healthy control at 4°C for 30 min, with or without blocking Fc receptors with anti-CD16/CD32/CD64 antibodies before incubation. After washed twice, cells were stained with FITC-conjugated anti-human IgG antibody (Abclonal, USA) at 4°C for 30 min. Cells were washed, resuspended in 500 μl staining buffer and analyzed by flow cytometry.
Measurement of the binding of anti-dsDNA antibodies to HMCs by cellular ELISA
HMCs were seeded in 96-well culture plates until 90% confluence. Cells were fixed with 4% formaldehyde at room temperature for 10 min and blocked with 5% BSA at 37°C for 30 min. Then the cells were incubated with hydrogen peroxide solution at room temperature for 30 min. Cells were incubated with 20 μg/ml of anti-dsDNA antibodies from LN patients or IgG from healthy control at 4°C overnight, with or without blocking Fc receptors with anti-CD16/CD32/CD64 antibodies before incubation. Cells were washed and incubated with anti-human horseradish peroxidase conjugated-antibody for 30 min at room temperature. After washing, cells were incubated with o-phenylenediamine (OPD) and OD values were determined at 450 nm.
HMCs were plated in 60-mm dishes, cultured until 50% confluence and transfected with 40 nM ATF4 siRNA (Ruibo-bio, China) complexed with Lipofectamine 2000 (Invitrogen, USA) in 500 μl Opti-MEM I Reduced-Serum Medium (Invitrogen, USA) at 37°C in a CO2 incubator. In control experiments, cells were transfected with 40 nM of negative control siRNA complexed with Lipofectamine 2000. After 6 h of incubation, the RNAi-Lipofectamine complex was removed, and the cells were cultured overnight in 1640 supplemented with 10% FBS. Twenty-four hours after transfection, cells were grow-arrested for 12 h and maintained with serum-free medium for 24 h prior to use. Then HMCs were incubated with 10 μg/ml anti-dsDNA antibodies for 24 h.
Western blot analysis
Proteins were extracted from HMCs and separated by 10% SDS–polyacrylamide gels. Nuclear and cytoplasmic proteins were extracted by using a nuclear protein extraction kit (Pierce, USA) according to the manufacture’s instructions. Then the proteins were electrotransferred onto polyvinylidinedifluoride membranes. After blocking with 5% bovine serum albumin in TBST, the membranes were incubated with anti-GRP78 (Novus, USA), anti-p-PERK (Cell Signaling Technology, USA), anti-PERK (Santa, Cruz, USA), anti-ATF4 (Santa Cruz, USA), anti-p-eIF2α (Cell Signaling Technology, USA), anti-eIF2α (Santa Cruz, USA), anti-IRE1α (Abcam, Hongkong), anti-ATF6 (Santa Cruz, USA), anti-CHOP (Santa Cruz, USA), anti-GAPDH (Kangcheng, China) primary antibodies at 4°C overnight. Nuclear protein was used to measure NF-κB p65 (Santa Cruz, USA) in the nucleus. Anti-fibrillarin (Santa Cruz, USA) was used as control. The membranes were then washed with TBST and incubated with horseradish peroxidase conjugated anti-rabbit IgG or anti-mouse IgG (Cell Signaling Technology, USA) at room temperature for 60 min, washed with TBST and the signal was detected by enhanced chemiluminescence (ECL). Band density was measured by densitometry with image J software.
Total RNA was extracted from cultured cell using Trizol Reagent (Invitrogen, USA). RNA was reverse-transcribed into cDNA using the revert transcriptase (Fermentas, USA). cDNA was amplified in a PCR reaction using recombinant Taq DNA polymerase (Fermentas, USA). The following primers for human MCP-1, TNF-α, IL-1β and GAPDH were used: MCP-1: 5′-GAT CTC AGT GCA GAG GCT CG-3′ (forward), 5′-TGC TTG TCC AGG TGG TCC AT-3′ (reverse), TNF-α: 5′-CCC AGG GAC CTC TCT CTA ATC A-3′ (forward), 5′-GCT ACA GGC TTG TEA CTC GG-3′ (reverse), IL-1β: 5′-CGT CAG TTG TTG TGG CCA T-3′ (forward), 5′-GCG TGC AGT TCA GTG ATC GTA-3′ (reverse), GAPDH:5′-GAA GGT GAA GGT CGG AGT C-3′ (forward), 5′- GAA GAT GGT GAT GGG ATT TC-3′ (reverse). SYBR green-based quantitative real-time PCR were performed in triplicate in a Bio-Rad IQ5. The cDNA were denatured at 95°C for 10 min and 35 cycles at 95°C for 15 s, 60°C for 1 min. Results of comparative real-time PCR were analyzed using IQ5 Software (Bio-Rad, USA). GAPDH was performed as an intracellular control to confirm the quantity of RNA.
HMCs were incubated with 10 μg/ml anti-dsDNA antibodies or control IgG for up to 48 h, after which the supernatant was collected and centrifuged at 2,000 rpm for 10 min to remove cell debris. The levels of IL-1β, MCP-1 and TNF-α in each sample were measured using commercial ELISA kits (Raybiotech, USA) according to the manufacturer’s instructions.
The results are expressed as the mean ± SD. Statistical analysis was performed using SPSS 13.0. The differences were assessed by t test, or one way ANOVA with or without repeated measurements followed by Bonferroni’s multiple comparison post test as appropriate. Two-tailed p < 0.05 was considered statistically significant.
Anti-dsDNA antibodies bound to HMCs
Anti-dsDNA antibodies induced the activation of PERK ER stress pathway in HMCs
Anti-dsDNA antibodies did not induce the activation of IRE1α and ATF6 ER stress pathways in HMCs
Anti-dsDNA antibodies activated NF-κB and up-regulated inflammation in HMCs
Chemical chaperone inhibited anti-dsDNA antibody-induced ER stress in HMCs
Anti-dsDNA antibodies induced the activation of NF-κB in HMCs via PERK-eIF2α-ATF4 pathway
This study demonstrated that anti-dsDNA antibodies can bind to HMCs and result in NF-κB activation and increased the expression of pro-inflammatory cytokines through the induction of ER stress. The anti-dsDNA antibody-induced inflammation in HMCs was mediated through the PERK-eIF2α-ATF4 ER stress pathway.
Although anti-dsDNA antibodies are believed to be involved in the pathogenesis of LN, how they deposit and elicit inflammation in the glomeruli is not fully elucidated. Early study showed that a monoclonal anti-dsDNA antibody PME77 bound to a number of human cell types: erythrocytes, neuroblastoma, a T-lymphoblastoid cell line (HSB2), a B-lymphoblastoid cell line (Ramos) and normal T and B lymphocytes . Subsequent study revealed that anti-dsDNA antibody bind to cell surface protein via nuceleosomes or a DNA-histone complexs in human fibroblast CVI cells . In human mesangial cells (HMCs), affinity-purified polyclonal anti-DNA antibodies from patients with SLE can bind to cultured HMCs , which was mediated though annexin II . It is interesting to note that the binding of anti-DNA antibodies to HMC was increased after the removal of Ig-associated DNA by DNase treatment, but it was unaffected by DNase treatment of HMC membrane . These suggest a direct binding of anti-dsDNA antibodies to HMC rather than mediation through DNA or DNA-histone complex. In the present study, binding of anti-dsDNA antibodies to HMCs was confirmed by flow cytometry and by cellular ELISA. In addition, blocking of Fc receptor did not affect the binding of anti-dsDNA antibodies to HMCs, indicating that anti-dsDNA antibodies bind to HMCs via Fab fragments.
ER stress has been reported to be associated with chronic inflammatory or autoimmune diseases including diabetes and obesity, neurodegenerative and neuromuscular inflammatory diseases, and inflammatory bowel diseases [24–26]. ER stress is also observed in renal inflammation [27, 28]. In a rat anti-Thy1 mesangioproliferative nephritis, there was an increase in the expression of the ER stress-inducible chaperones GRP78 and oxygen-related protein 150 in isolated glomeruli, especially in the glomerular epithelial cells and mesangial cells, after the induction of the disease . In human primary glomerulonephritis (GN), there was pronounced increased expression of GRP78 in proliferative GN compared to non-GN, suggesting that ER stress pathway might be involved in the progression of GN . The role of ER stress in lupus nephritis (LN) is still not clear. It has been shown that homocysteine-induced ER protein (Herp), an ER stress-inducible protein, was able to bind to anti-dsDNA antibodies , and was a potential triggering antigen for anti-DNA response , implying that anti-dsDNA antibodies have a functional connection with ER stress in the pathogenesis of LN. In this study, we found that stimulation of HMCs with anti-dsDNA antibodies resulted in significantly increased expression of GRP78 and increased expression of inflammatory cytokines IL-1β, MCP-1 and TNF-α. These results suggest that anti-dsDNA antibodies can elicit proinflammatory response in HMC via inducing ER stress.
The ER stress response consists of three transmembrane signal transducers including protein kinase IRE1, PERK and the transcription factor ATF6 . Our results showed that the ER stress inducer thapsigargin can activate all three pathways. In contrast, anti-dsDNA antibodies only significantly activate PERK and its downstream molecules, eIF2α and ATF4. There were no significant changes in the expression of p-IRE1α or ATF6, indicating anti-dsDNA antibodies elicit ER stress in HMCs through PERK pathway only. The reason for such a discrepancy is not clear. It is postulated that anti-dsDNA antibodies might bind to the membrane molecule that activates PERK ER stress pathway specifically.
NF-κB, a major transcription factor in regulating inflammatory processes, is involved in the pathogenesis of LN. Inhibition of NF-κB resulted in ameliorated inflammation in the mouse LN model . It has been shown that ER stress induces the activation of NF-κB [34–36]. ER stress inducers including thapsigargin and tunicamycin increase the activity of NF-κB as well as NF-κB-dependent gene expression . PERK and eIF2α were reported to be involved in the activation of NF-κB and the phosphorylation of PERK and eIF2α were in accordance with the activation of IKK/NF-κB . This implies that PERK pathway might play an important role in the activation of NF-κB. In the present study, anti-dsDNA antibodies induced the activation of ER stress accompanied with the activation of NF-κB and up-regulation of IL-1β, TNF-α and MCP-1. Inhibition of ER stress in HMCs with chemical chaperon 4-PBA reduced the activation of NF-κB and the expression of IL-1β, TNF-α and MCP-1. In addition, specific depletion of ATF4 significantly reduced the activation of NF-κB and the expression of proinflammatory cytokines. These indicate that anti-dsDNA antibodies activate NF-κB in HMC via inducing ER stress.
The activation of CHOP in ER stress is recognized to be involved in cell apoptosis . However, CHOP can also be activated by ATF4 and increase the production of inflammatory cytokines . These raise the the possibility that the upregulation of proinflammatory cytokines induced by anti-dsDNA antibodies in HMCs is the result of CHOP activation rather than through NF-κB activation. However, inhibition of ER stress by chemical chaperon or the specific ATF4 silencing did reduce NF-κB activation, suggesting a cross talk between ER stress signaling pathway and NF-κB activation. Indeed, ATF4 is involved in the activation of NF-κB in macrophage induced by saturated fatty acids . The activation of NF-κB was significantly decreased in ATF4 haploinsufficiency macrophage . On the other hand, our results showed that anti-dsDNA antibodies did not induce the expression of CHOP. This study provides new evidences that anti-dsDNA antibodies activate NF-κB and cause inflammation in HMCs via PERK-eIF2α-ATF4 ER stress pathway.
This study demonstrated that anti-dsDNA antibodies induce NF-κB activation and enhanced expression of pro-inflammatory cytokines in HMCs via PERK-eIF2α-ATF4 ER stress pathway. ER stress response may be involved in the development or progression of LN initiated by anti-dsDNA antibodies.
NY, HZ and CZ conceived and designed the study and interpreted the data. SW conducted the in vitro cell culture. YH helped design the study and interpreted data. HW and CZ conducted the flow cytometry, western blot analysis and interpreted data. JZ conducted the qPCR, ELISA and interpreted data. The manuscript was drafted by HZ. All authors read and approved the final manuscript.
This work was supported by Grants from the Guangzhou Science and Technology Planning Program (2012J4100085), National Natural Science Foundation of China (81273278), the PhD Program Foundation of Ministry of Education of China (20120171110064), and Guangdong Natural Science Foundation (S2012010008780, and S2011010004578).
Compliance with ethical guidelines
Competing interests All the authors have no competing interests to declare.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- Sherer Y, Gorstein A, Fritzler MJ, Shoenfeld Y (2004) Autoantibody explosion in systemic lupus erythematosus: more than 100 different antibodies found in SLE patients. Semin Arthritis Rheum 34:501–537PubMedView ArticleGoogle Scholar
- de Salgado Zubiria A, Herrera-Diaz C (2012) Lupus nephritis: an overview of recent findings. Autoimmune Dis 2012:849684Google Scholar
- ter Borg EJ, Horst G, Hummel EJ, Limburg PC, Kallenberg CG (1990) Measurement of increases in anti-double-stranded DNA antibody levels as a predictor of disease exacerbation in systemic lupus erythematosus. A long-term, prospective study. Arthritis Rheum 33:634–643PubMedView ArticleGoogle Scholar
- Sun KH, Yu CL, Tang SJ, Sun GH (2000) Monoclonal anti-double-stranded DNA autoantibody stimulates the expression and release of IL-1beta, IL-6, IL-8, IL-10 and TNF-alpha from normal human mononuclear cells involving in the lupus pathogenesis. Immunology 99:352–360PubMed CentralPubMedView ArticleGoogle Scholar
- Yung S, Cheung KF, Zhang Q, Chan TM (2010) Anti-dsDNA antibodies bind to mesangial annexin II in lupus nephritis. J Am Soc Nephrol 21:1912–1927PubMed CentralPubMedView ArticleGoogle Scholar
- Kaufman RJ (1999) Stress signaling from the lumen of the endoplasmic reticulum: coordination of gene transcriptional and translational controls. Genes Dev 13:1211–1233PubMedView ArticleGoogle Scholar
- Rutkowski DT, Kaufman RJ (2004) A trip to the ER: coping with stress. Trends Cell Biol 14:20–28PubMedView ArticleGoogle Scholar
- Ron D (2001) Hyperhomocysteinemia and function of the endoplasmic reticulum. J Clin Invest 107:1221–1222PubMed CentralPubMedView ArticleGoogle Scholar
- Ron D, Walter P (2007) Signal integration in the endoplasmic reticulum unfolded protein response. Nat Rev Mol Cell Biol 8:519–529PubMedView ArticleGoogle Scholar
- Marciniak SJ, Ron D (2006) Endoplasmic reticulum stress signaling in disease. Physiol Rev 86:1133–1149PubMedView ArticleGoogle Scholar
- Rutkowski DT, Kaufman RJ (2003) All roads lead to ATF4. Dev Cell 4:442–444PubMedView ArticleGoogle Scholar
- Zhang K, Kaufman RJ (2008) From endoplasmic-reticulum stress to the inflammatory response. Nature 454:455–462PubMed CentralPubMedView ArticleGoogle Scholar
- Todd DJ, Lee AH, Glimcher LH (2008) The endoplasmic reticulum stress response in immunity and autoimmunity. Nat Rev Immunol 8:663–674PubMedView ArticleGoogle Scholar
- Tak PP, Firestein GS (2001) NF-kappaB: a key role in inflammatory diseases. J Clin Invest 107:7–11PubMed CentralPubMedView ArticleGoogle Scholar
- Ghosh S, Baltimore D (1990) Activation in vitro of NF-kappa B by phosphorylation of its inhibitor I kappa B. Nature 344:678–682PubMedView ArticleGoogle Scholar
- Kaneko M, Niinuma Y, Nomura Y (2003) Activation signal of nuclear factor-kappa B in response to endoplasmic reticulum stress is transduced via IRE1 and tumor necrosis factor receptor-associated factor 2. Biol Pharm Bull 26:931–935PubMedView ArticleGoogle Scholar
- Zheng L, Sinniah R, Hsu SI (2006) In situ glomerular expression of activated NF-kappaB in human lupus nephritis and other non-proliferative proteinuric glomerulopathy. Virchows Arch 448:172–183PubMedView ArticleGoogle Scholar
- Zheng L, Sinniah R, Hsu SI (2008) Pathogenic role of NF-kappaB activation in tubulointerstitial inflammatory lesions in human lupus nephritis. J Histochem Cytochem 56:517–529PubMed CentralPubMedView ArticleGoogle Scholar
- Inagi R (2010) Endoplasmic reticulum stress as a progression factor for kidney injury. Curr Opin Pharmacol 10:156–165PubMedView ArticleGoogle Scholar
- Cybulsky AV (2010) Endoplasmic reticulum stress in proteinuric kidney disease. Kidney Int 77:187–193PubMedView ArticleGoogle Scholar
- Chan TM, Leung JK, Ho SK, Yung S (2002) Mesangial cell-binding anti-DNA antibodies in patients with systemic lupus erythematosus. J Am Soc Nephrol 13:1219–1229PubMedView ArticleGoogle Scholar
- Jacob L, Tron F, Bach JF, Louvard D (1984) A monoclonal anti-DNA antibody also binds to cell-surface protein(s). Proc Natl Acad Sci USA 81:3843–3845PubMed CentralPubMedView ArticleGoogle Scholar
- Jacob L, Viard JP, Allenet B, Anin MF, Slama FB, Vandekerckhove J et al (1989) A monoclonal anti-double-stranded DNA autoantibody binds to a 94-kDa cell-surface protein on various cell types via nucleosomes or a DNA-histone complex. Proc Natl Acad Sci U S A 86:4669–4673PubMed CentralPubMedView ArticleGoogle Scholar
- Ozcan U, Cao Q, Yilmaz E, Lee AH, Iwakoshi NN, Ozdelen E et al (2004) Endoplasmic reticulum stress links obesity, insulin action, and type 2 diabetes. Science 306:457–461PubMedView ArticleGoogle Scholar
- Nagaraju K, Casciola-Rosen L, Lundberg I, Rawat R, Cutting S, Thapliyal R et al (2005) Activation of the endoplasmic reticulum stress response in autoimmune myositis: potential role in muscle fiber damage and dysfunction. Arthritis Rheum 52:1824–1835PubMedView ArticleGoogle Scholar
- Kaser A, Lee AH, Franke A, Glickman JN, Zeissig S, Tilg H et al (2008) XBP1 links ER stress to intestinal inflammation and confers genetic risk for human inflammatory bowel disease. Cell 134:743–756PubMed CentralPubMedView ArticleGoogle Scholar
- Kitamura M (2008) Endoplasmic reticulum stress and unfolded protein response in renal pathophysiology: Janus faces. Am J Physiol Renal Physiol 295:F323–F334PubMedView ArticleGoogle Scholar
- Cybulsky AV, Takano T, Papillon J, Bijian K (2005) Role of the endoplasmic reticulum unfolded protein response in glomerular epithelial cell injury. J Biol Chem 280:24396–24403PubMedView ArticleGoogle Scholar
- Inagi R, Kumagai T, Nishi H, Kawakami T, Miyata T, Fujita T et al (2008) Preconditioning with endoplasmic reticulum stress ameliorates mesangioproliferative glomerulonephritis. J Am Soc Nephrol 19:915–922PubMed CentralPubMedView ArticleGoogle Scholar
- Markan S, Kohli HS, Joshi K, Minz RW, Sud K, Ahuja M et al (2009) Up regulation of the GRP-78 and GADD-153 and down regulation of Bcl-2 proteins in primary glomerular diseases: a possible involvement of the ER stress pathway in glomerulonephritis. Mol Cell Biochem 324:131–138PubMedView ArticleGoogle Scholar
- Hirabayashi Y, Oka Y, Tada M, Takahashi R, Ishii T (2007) A potential trigger of nephritogenic anti-DNA antibodies in lupus nephritis. Ann NY Acad Sci 1108:92–95PubMedView ArticleGoogle Scholar
- Hirabayashi Y, Oka Y, Ikeda T, Fujii H, Ishii T, Sasaki T et al (2010) The endoplasmic reticulum stress-inducible protein, Herp, is a potential triggering antigen for anti-DNA response. J Immunol 184:3276–3283PubMedView ArticleGoogle Scholar
- Zhao J, Zhang H, Huang Y, Wang H, Wang S, Zhao C et al (2013) Bay11-7082 attenuates murine lupus nephritis via inhibiting NLRP3 inflammasome and NF-kappaB activation. Int Immunopharmacol 17:116–122PubMedView ArticleGoogle Scholar
- Hung JH, Su IJ, Lei HY, Wang HC, Lin WC, Chang WT et al (2004) Endoplasmic reticulum stress stimulates the expression of cyclooxygenase-2 through activation of NF-kappaB and pp38 mitogen-activated protein kinase. J Biol Chem 279:46384–46392PubMedView ArticleGoogle Scholar
- Hu P, Han Z, Couvillon AD, Kaufman RJ, Exton JH (2006) Autocrine tumor necrosis factor alpha links endoplasmic reticulum stress to the membrane death receptor pathway through IRE1alpha-mediated NF-kappaB activation and down-regulation of TRAF2 expression. Mol Cell Biol 26:3071–3084PubMed CentralPubMedView ArticleGoogle Scholar
- Zhang X, Zhang G, Zhang H, Karin M, Bai H, Cai D (2008) Hypothalamic IKKbeta/NF-kappaB and ER stress link overnutrition to energy imbalance and obesity. Cell 135:61–73PubMed CentralPubMedView ArticleGoogle Scholar
- Pahl HL, Baeuerle PA (1995) A novel signal transduction pathway from the endoplasmic reticulum to the nucleus is mediated by transcription factor NF-kappa B. Embo J 14:2580–2588PubMed CentralPubMedGoogle Scholar
- Oyadomari S, Mori M (2004) Roles of CHOP/GADD153 in endoplasmic reticulum stress. Cell Death Differ 11:381–389PubMedView ArticleGoogle Scholar
- Nishitoh H (2012) CHOP is a multifunctional transcription factor in the ER stress response. J Biochem 151:217–219PubMedView ArticleGoogle Scholar
- Iwasaki Y, Suganami T, Hachiya R, Shirakawa I, Kim-Saijo M, Tanaka M et al (2014) Activating transcription factor 4 links metabolic stress to interleukin-6 expression in macrophages. Diabetes 63:152–161PubMedView ArticleGoogle Scholar