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Event: 1714

Key Event Title

The KE title should describe a discrete biological change that can be measured. It should generally define the biological object or process being measured and whether it is increased, decreased, or otherwise definably altered relative to a control state. For example “enzyme activity, decreased”, “hormone concentration, increased”, or “growth rate, decreased”, where the specific enzyme or hormone being measured is defined. More help

Exacerbation of systemic lupus erythematosus (SLE)

Short name
The KE short name should be a reasonable abbreviation of the KE title and is used in labelling this object throughout the AOP-Wiki. The short name should be less than 80 characters in length. More help
Exacerbation of SLE

Biological Context

Structured terms, selected from a drop-down menu, are used to identify the level of biological organization for each KE. Note, KEs should be defined within a particular level of biological organization. Only KERs should be used to transition from one level of organization to another. Selection of the level of biological organization defines which structured terms will be available to select when defining the Event Components (below). More help
Level of Biological Organization

Key Event Components

Further information on Event Components and Biological Context may be viewed on the attached pdf.Because one of the aims of the AOP-KB is to facilitate de facto construction of AOP networks through the use of shared KE and KER elements, authors are also asked to define their KEs using a set of structured ontology terms (Event Components). In the absence of structured terms, the same KE can readily be defined using a number of synonymous titles (read by a computer as character strings). In order to make these synonymous KEs more machine-readable, KEs should also be defined by one or more “event components” consisting of a biological process, object, and action with each term originating from one of 22 biological ontologies (Ives, et al., 2017; See List). Biological process describes dynamics of the underlying biological system (e.g., receptor signalling). The biological object is the subject of the perturbation (e.g., a specific biological receptor that is activated or inhibited). Action represents the direction of perturbation of this system (generally increased or decreased; e.g., ‘decreased’ in the case of a receptor that is inhibited to indicate a decrease in the signalling by that receptor).Note that when editing Event Components, clicking an existing Event Component from the Suggestions menu will autopopulate these fields, along with their source ID and description. To clear any fields before submitting the event component, use the 'Clear process,' 'Clear object,' or 'Clear action' buttons. If a desired term does not exist, a new term request may be made via Term Requests. Event components may not be edited; to edit an event component, remove the existing event component and create a new one using the terms that you wish to add. More help

Key Event Overview

AOPs Including This Key Event

All of the AOPs that are linked to this KE will automatically be listed in this subsection. This table can be particularly useful for derivation of AOP networks including the KE. Clicking on the name of the AOP will bring you to the individual page for that AOP. More help
AOP Name Role of event in AOP Point of Contact Author Status OECD Status
Binding to ER-α leading to exacerbation of SLE AdverseOutcome Yasuharu Otsubo (send email) Under development: Not open for comment. Do not cite Under Development


This is a structured field used to identify specific agents (generally chemicals) that can trigger the KE. Stressors identified in this field will be linked to the KE in a machine-readable manner, such that, for example, a stressor search would identify this as an event the stressor can trigger. NOTE: intermediate or downstream KEs in one AOP may function as MIEs in other AOPs, meaning that stressor information may be added to the KE description, even if it is a downstream KE in the pathway currently under development.Information concerning the stressors that may trigger an MIE can be defined using a combination of structured and unstructured (free-text) fields. For example, structured fields may be used to indicate specific chemicals for which there is evidence of an interaction relevant to this MIE. By linking the KE description to a structured chemical name, it will be increasingly possible to link the MIE to other sources of chemical data and information, enhancing searchability and inter-operability among different data-sources and knowledgebases. The free-text section “Evidence for perturbation of this MIE by stressor” can be used both to identify the supporting evidence for specific stressors triggering the MIE as well as to define broad chemical categories or other properties that classify the stressors able to trigger the MIE for which specific structured terms may not exist. More help

Taxonomic Applicability

Latin or common names of a species or broader taxonomic grouping (e.g., class, order, family) can be selected from an ontology. In many cases, individual species identified in these structured fields will be those for which the strongest evidence used in constructing the AOP was available in relation to this KE. More help

Life Stages

The structured ontology terms for life-stage are more comprehensive than those for taxa, but may still require further description/development and explanation in the free text section. More help
Life stage Evidence
All life stages

Sex Applicability

The authors must select from one of the following: Male, female, mixed, asexual, third gender, hermaphrodite, or unspecific. More help
Term Evidence

Key Event Description

A description of the biological state being observed or measured, the biological compartment in which it is measured, and its general role in the biology should be provided. For example, the biological state being measured could be the activity of an enzyme, the expression of a gene or abundance of an mRNA transcript, the concentration of a hormone or protein, neuronal activity, heart rate, etc. The biological compartment may be a particular cell type, tissue, organ, fluid (e.g., plasma, cerebrospinal fluid), etc. The role in the biology could describe the reaction that an enzyme catalyses and the role of that reaction within a given metabolic pathway; the protein that a gene or mRNA transcript codes for and the function of that protein; the function of a hormone in a given target tissue, physiological function of an organ, etc. Careful attention should be taken to avoid reference to other KEs, KERs or AOPs. Only describe this KE as a single isolated measurable event/state. This will ensure that the KE is modular and can be used by other AOPs, thereby facilitating construction of AOP networks. More help

SLE is an autoimmune disease characterized by overproduction of a variety of anti-cell nuclear and other pathogenic autoantibodies.  It is characterized by B-cell hyperactivity, polyclonal hypergammaglobulinemia, and glomerulonephritis as immune complex deposition.  Once SLE is suspected, the initial evaluation should include an antinuclear antibody (ANA) test. This is a highly sensitive test, with positive results in about 94% of patients with SLE. However, it also has low specificity, and may be positive in healthy patients. If ANA results show a 1:40 titer or higher, more specific tests should be performed, including measurement of anti–double-stranded DNA (anti-dsDNA), anti-Smith, anti-RNP, anticardiolipin, beta-2 glycoprotein antibodies and lupus anticoagulant; elevated levels of one or more of these biomarkers increase the likelihood of SLE (Nguyet-Cam VL. 2016).  In the Systemic Lupus International Collaborating Clinics 2012 classification for SLE, biopsy-proven lupus nephritis plus positive ANA or anti-dsDNA is sufficient to fulfil SLE classification criteria (Bernard T. 2017).  SLE is the prototypic multisystem autoimmune disorder with a broad spectrum of clinical presentations encompassing almost all organs and tissues including skin, kidney, heart, lungs, and joints.  The pathogenesis of SLE includes both genetic and environmental components with female sex strongly influencing pathogenesis.  These factors lead to an irreversible break in immunological tolerance manifested by immune responses against endogenous nuclear antigens (Daniel P. 2011).

It has been determined in a murine model of SLE that ERα is required for disease progression and that ERα deficiency impedes the course of the disease (Bynote KK. 2008).  There is increased ERα mRNA expression in PBMCs of SLE patients (Inui A. 2007).  It is considered that MIE affect later events and result in SLE.

How It Is Measured or Detected

One of the primary considerations in evaluating AOPs is the relevance and reliability of the methods with which the KEs can be measured. The aim of this section of the KE description is not to provide detailed protocols, but rather to capture, in a sentence or two, per method, the type(s) of measurements that can be employed to evaluate the KE and the relative level of scientific confidence in those measurements. Methods that can be used to detect or measure the biological state represented in the KE should be briefly described and/or cited. These can range from citation of specific validated test guidelines, citation of specific methods published in the peer reviewed literature, or outlines of a general protocol or approach (e.g., a protein may be measured by ELISA).Key considerations regarding scientific confidence in the measurement approach include whether the assay is fit for purpose, whether it provides a direct or indirect measure of the biological state in question, whether it is repeatable and reproducible, and the extent to which it is accepted in the scientific and/or regulatory community. Information can be obtained from the OECD Test Guidelines website and the EURL ECVAM Database Service on Alternative Methods to Animal Experimentation (DB-ALM). ?

[in vivo assay]

Murine lupus models such as New Zealand Black (NZB)×New Zealand White (NZW) F1 (NZB/W F1), NZB.H-2bm12, NZB×SWR F1 (SNF1), MRL.lpr/lpr, and BXSB mice have led to a better understanding of the pathogenic mechanisms of lupus.  All of these species of mice develop anti-dsDNA antibody, which is a characteristic of lupus, and die of uremia in early life.  Among these murine lupus models, the natural course of NZB/W F1 mice is closer to human lupus than MRL.lpr/lpr and BXSB mice (Zhang DH. 1997, Pai SY. 2004, Daniel P. 2011).

For the disease onset, mice can monitor by proteinuria levels, body weights, blood urea nitrogen and appearance over time. (Gabriela T. 2019, John LS. 2008, Wang Y.1996).  The major cause of death in the NZB/W F1 female is chronic glomerulonephritis with heavy mesangial deposits, tubular cast formation, proliferation of glomerular cells, prominent crescent formation, and a significant periglomerular and interstitial monocytic infiltrate.  Extraglomerular renal deposits of IgG2a and C3 are present in the peritubular tissue and arterioles, and increase in frequency with age.  Histological alterations in the kidney were assessed by Hematoxylin Eosin (H&E) and Periodic acid-Schiff (PAS) staining, expression of IgG and C3 was detected by immunohistochemistry (Gabriela T. 2019, Brian S. 1978).

To examine the relationship between oral contraceptive (OC) use and the development of SLE, analyzed data (1976 - 1990) from the Nurses’ Health Study cohort.  The questionnaire used to assemble biennially the group sought information on a variety of health conditions and exposures, such as use of OCs, use of post-menopausal hormones (PMH), current and past cigarette smoking habits and other health practices.  Incidence of SLE was defined by; 1) strict American College of Rheumatology (ACR) classification criteria (> or = 4 ACR criteria), 2) > or = 4 ACR criteria and any physician's diagnosis, 3) > or = 4 ACR criteria and diagnosis by an ACR-certified rheumatologist, 4) > or = 3 ACR criteria, or 5) diagnosis by a physician even if the patient did not meet the ACR criteria. (Bertsias G. 2012, Sanchez-Guerrero J.1997). 

Typical clinical symptoms include combinations of renal disease, swollen joints, skin rash, hematologic disorders, respiratory, and neurologic dysfunction.

Domain of Applicability

This free text section should be used to elaborate on the scientific basis for the indicated domains of applicability and the WoE calls (if provided). While structured terms may be selected to define the taxonomic, life stage and sex applicability (see structured applicability terms, above) of the KE, the structured terms may not adequately reflect or capture the overall biological applicability domain (particularly with regard to taxa). Likewise, the structured terms do not provide an explanation or rationale for the selection. The free-text section on evidence for taxonomic, life stage, and sex applicability can be used to elaborate on why the specific structured terms were selected, and provide supporting references and background information.  More help

Exacerbation of SLE is common in humans and rodents, and is considered likely to occur in other animal species, as well.  SLE is an autoimmune disease that occurs primarily in women (9:1 compared to men) (Rider V. 2001).  SLE is an autoimmune disease that affects predominantly women during reproductive years, and its evolution is altered by hormonal events such as menses, menopause, and especially pregnancy (Luis JJ. 2014).  The incidence of SLE is markedly increased in females of child-bearing age (Grainne M. 2013).  Th1/Th2 shift is one of the most important immunologic changes during gestation.  It is due to the progressive increase of estrogens, which reach peak level in the third trimester of pregnancy.  At these high levels, estrogens suppress the Th1-mediated responses and stimulate Th2-mediated immunologic responses.  For this reason, Th1-mediated diseases, such as rheumatoid arthritis, tend to improve, while Th2-mediated diseases, such as SLE tend to worsen during pregnancy (Doria A. 2006).

Female MRL/lpr mice that developed lymphadenopathy and a lupus-like disease also exhibited a 50% higher mortality rate than males at 5 months of age.  In (NZB×NZW) F1 mice too, females develop signs of SLE several months before males, with severe autoimmune hemolytic anemia, glomerulonephritis, and autoantibodies to single-stranded DNA, doublestranded DNA, and histones (Carlsten H. 1992).

The effects of estrogen receptor signaling on T cells also appear to be dose dependent (Melissa, and Gary 2011).  Low serum levels (60‑100 pg/mL or 0.26‑0.43 nM) of estradiol have been shown to increase Th1 T-cell development in vitro through an ERα mediated mechanism (Maret A. 2003).  In contrast of SLE exacerbated by Th2, treatment with low doses of estrogen (25 pg/ml or 0.1 nM) ameliorated autoimmune diseases (multiple sclerosis; MS, rheumatoid arthritis; RA, and experimental autoimmune encephalomyelitis; EAE, etc.) caused by Th1, while high doses (>1000 pg/ml or 4.3 nM), which mimic pregnancy levels, prevented EAE onset polarized T-cells to a Th2 phenotype in the EAE model (Bebo BF. 2001).

Evidence for Perturbation by Stressor


The NZB/W F1 mouse is the oldest classical model of lupus generated by the F1 hybrid between the NZB and NZW strains.  In both NZB/W F1 and MRL/lpr mice, estrogen treatment exacerbates the lupus disease (Grimaldi CM. 2002, Peeva E. 2000).  In postmenopausal women there was an increase in number of mild flares in women receiving estrogen supplementation suggesting that the addition of estrogen to a low estrogen state enhances flare rate (Buyon JP. 1998).

Regulatory Significance of the Adverse Outcome

An AO is a specialised KE that represents the end (an adverse outcome of regulatory significance) of an AOP. For KEs that are designated as an AO, one additional field of information (regulatory significance of the AO) should be completed, to the extent feasible. If the KE is being described is not an AO, simply indicate “not an AO” in this section.A key criterion for defining an AO is its relevance for regulatory decision-making (i.e., it corresponds to an accepted protection goal or common apical endpoint in an established regulatory guideline study). For example, in humans this may constitute increased risk of disease-related pathology in a particular organ or organ system in an individual or in either the entire or a specified subset of the population. In wildlife, this will most often be an outcome of demographic significance that has meaning in terms of estimates of population sustainability. Given this consideration, in addition to describing the biological state associated with the AO, how it can be measured, and its taxonomic, life stage, and sex applicability, it is useful to describe regulatory examples using this AO. More help

There are concerns about the increase in autoimmune diseases caused by estrogen-like substances, and its accurate in vitro toxicity assessment system is required in international regulations.  The OECD has published a revised version of the guidance document on standardized test guidelines for evaluating ED (OECD. 2019).


List of the literature that was cited for this KE description. Ideally, the list of references, should conform, to the extent possible, with the OECD Style Guide ( (OECD, 2015). More help
  1. Nguyet-Cam Vu Lam, Maria V. Ghetu and Marzena L. BIENIEK. Systemic Lupus Erythematosus: Primary Care Approach to Diagnosis and Management. American Family Physician, 2016; 94 (4): 284-294.
  2. Bernard Thong and Nancy J. Olsen. Systemic lupus erythematosus diagnosis and management. Rheumatology 2017; 56: i3-i13.
  3. Daniel, P., Allison, S., Yiming, Y., Ying-Yi, Z. and Laurence, M. Murine Models of Systemic Lupus erythematosus. Journal of Biomedicine and Biotechnology 2011: ArticleID 271694
  4. Bynote, KK, Hackenberg, JM., Korach, K.S., Lubahn, D. B., Lane, P. H. and Gould, K. A. (2008). Estrogen receptor-alpha deficiency attenuates autoimmune disease in (NZB xNZW) F1 mice. Genes and Immunity. 9: 137-152.
  5. Inui A, Ogasawara H, Ogawa H, et al. Estrogen receptor expression by peripheral blood mononuclear cells of patients with systemic lupus erythematosus. Clin Rheumatol. 2007;26(10):1675-8.
  6. Zhang DH, Cohn L, Ray P, Bottomly K, Ray A. Transcription factor GATA-3 is differentially expressed in murine Th1 and Th2 cells and controls Th2-specific expression of the interleukin-5 gene. J Biol Chem. 1997. 22;272(34):21597-603.
  7. Pai SY, Truitt ML, Ho IC. GATA-3 deficiency abrogates the development and maintenance of T helper type 2 cells. Proc Natl Acad Sci U S A. 2004 Feb 17;101(7):1993-8.
  8. Gabriela, T., Yessia, H., Maria, R. B. and Mario, R. (2019), A Spontaneous Mouse Model of Lupus: Physiology and Therapy. IntechOpen Limited: 1-24.
  9. John, L. S., Jackie, E., Phil, R., Kenneth, S. K. and Gary, S. G. (2008), Impact of estrogen receptor deficiency on disease expression in the NZM2410 lupus prone mouse. Clin Immunol. 128(2): 259-268.
  10. Wang, Y., Hu, Q., Madri, J. A., Rollins, S.A., Chodera, A, and Matis, L. A. (1996), Amelioration of lupus-like autoimmune disease in NZB/W F1 mice after treatment with a blocking monoclonal antibody specific for complement component C5. Proc Natl Acad Sci U S A. 93(16):8563-8568.
  11. Brian S. Andrews, Robert A. Eisenberg, Argyrios N. Theofilopoulos, S Izui, Curtis B. Wilson, Patricia J. McConahey, Edwin D. Murphy, John B. Roths and Frank J. Dixon. Spontaneous Murine Lupus-Like Syndromes. Clinical and Immunopathological Manifestations in Several Strains. J. EXP. Med. 1978; 148(5):1198-215
  12. Bertsias G, Ricard Cervera and Dimitrios T. Boumpas. Systemic Lupus Erythematosus: Pathogenesis and Clinical Features. 20_Eular_Fpp.indd. 2012; 476-505.
  13. Sanchez-Guerrero J. Karlson EW. Liang MH. Hunter DJ,. Speizer F. E, and Colditz. G. A. Past Use of Oral Contraceptives and the Risk of Developing Systemic Lupus Erythematosus. Arthritis Rheum. 1997; 40 (5): 804-808.
  14. Rider, V. and Abdou, N. I. (2001). Gender differences in autoimmunity: molecular basis for estrogen effects in systemic lupus erythematosus. International Immunopharmacology 1(6): 1009-1024.
  15. Luis, J. J., Gabriela, M., Pilar, C.-D., Carmen, N., Olga V.-L. and Miguel., A. S. (2014). Risk factors of systemic lupus erythematosus flares during pregnancy. Immunologic Research 60: 184-192
  16. Grainne, M. and David, I. (2013). Effect of gender on clinical presentation in systemic lupus erythematosus. Rheumatology 52: 2108-2115
  17. Doria, A., Iaccarino, L., Sarzi-Puttini, P., Ghirardello, A., Zampieri, S., Arienti, S., Cutolo, M. and Todesco, S. (2006). Estrogens in pregnancy and systemic lupus erythematosus. Annals of the New York Academy of Sciences 1069: 247-256.
  18. Carlsten H, Nilsson N, Tarkowski A, et al. Estrogen accelerates immune complex glomerulonephritis but ameliorates T cell-mediated vasculitis and sialadenitis in autoimmune MRL lpr/lpr mice. Cell Immunol. 1992;144(1):190-202.
  19. Melissa, C and Gary, G (2011). Estrogen Receptors in Immunity and Autoimmunity. Clinical Reviews in Allergy & Immunology 40: 66-73.
  20. Maret, A., Coudert, J. D., Garidou, L., Foucras, G., Gourdy, P., Krust, A., Dupont, S., Chambon, P., Druet, P., Bayard, F. and Guéry, J. C. (2003). Estradiol enhances primary antigen-specific CD4 T cell responses and Th1 development in vivo. Essential role of estrogen receptor α expression in hematopoietic cells. The European Journal of Immunology 33: 512-521.
  21. Bebo, B. F. Jr., Fyfe-Johnson, A., Adlard, K., Beam, A. G., Vandenbark, A. A.and Offner, H. Low-Dose Estrogen Therapy Ameliorates Experimental Autoimmune Encephalomyelitis in Two Different Inbred Mouse Strains. (2001). The Journal of Immunology. 166: 2080-2089.
  22. Grimaldi CM, Cleary J, Dagtas AS, Moussai D, Diamond B. Estrogen alters thresholds for B cell apoptosis and activation. J Clin Invest. 2002;109(12):1625-33.
  23. Peeva E, Grimaldi C, Spatz L, Diamond B. Bromocriptine restores tolerance in estrogen-treated mice. J Clin Invest. 2000;106(11):1373-9.
  24. Buyon JP. Hormone replacement therapy in postmenopausal women with systemic lupus erythematosus. J Am Med Womens Assoc (1998) 53(1):13-17.
  25. OECD Series on Testing and Assessment [Revised Guidance Document 150 on Standardised Test Guidelines for Evaluating Chemicals for Endocrine Disruption. 2019].