kara kliethermes jim shinaberry december 6, 2012
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Kara Kliethermes Jim ShinaberryDecember 6, 2012
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What is rheumatoid arthritis? What are the underlying
mechanisms?EpidemiologyTriggers and risk factorsWhat leads to the development of
RA?Can RA be effectively treated?ReferencesStudy Questions
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Chronic, inflammatory and often progressive autoimmune disease affecting joints Frequently affects small joints Symmetrical inflammation Stiff/swollen, painful joints
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Results in:Deformity Joint destructionNodulesDisability
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Joint space narrowing
Excessive tissue growth
High levels of synovial fluid
Rheumatoid Joint
Normal Joint
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Begins with inflammation of synovial joints Leads to excessive synovial fluid
production▪ Fluid contains metalloproteinase enzyme▪ Attacks and erodes cartilage
Inflammation caused by infiltration of macrophages, T-helper cells and B-plasma cells
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Worldwide prevalence roughly 1-2% (2012)
Occurs most often between 50-60 years of age May begin around 30 years of age
Life expectancy of RA patients reduced 5-10 years Often resulting from CVD risk factors
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Human leukocyte antigen (HLA) HLA-DRB1 is a significant risk factor
gene
Viruses may be causative agents▪ Epstein Barr Virus (EBV)▪ High levels of EBV in synovial fluid of RA patients
The epitope polypeptide sequence of HLA-DBR1 (or DBR4) is similar to that of EBV and E-coli
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Commonly found in females Remission during pregnancy (hormone surge)
Flare up after birth
Is there a link between RA and hormones? (estrogen/progesterone)
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Sex hormones Estrogen▪ Estrogen activates macrophages
Progesterone
Other Invovled Hormones▪ Testosterone▪ DHEA▪ Prolactin▪ Promotes survival of T-cell dependent autoreactive B-cells
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Unknown causes Genetic predisposition hypothesized▪ Influenced by environmental risk factors
Rheumatoid Factor Autoantibody produced against Fc
region of IgG▪ The Fc regions of free IgG molecules are
accessed easily by these autoantibodies
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No cure
Treatments aim to: Achieve remission/ Control symptoms Preserve structure of joints (prevent damage/deformity)
Improve/maintain quality of life
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Rituximab (intravenous injection) Targets CD 20 on surface of B cells Results in destruction of B cells▪ both normal and dysfunctional
Tocilizumab Monoclonal Ab that blocks interleukin-6
receptors▪ IL-6 is responsible for activating inflammatory
cells
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Disease-modifying antirheumatic drugs (DMARDS) Alleviates symptoms caused by inflammation▪ Lessen joint distruction
Methotrexate (DMARD) Most widely used drug of choice Adenosine (active metabolite)-suppresses
expression of inflammatory cytokines Used in low doses to control inflammation▪ Reduces cytokine production
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HRT (Hormone Replacement Therapy) Initially successful Controversial ▪ Shown to cause endometrial cancer
Prevent bone loss
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Babushetty V, Sultanpur CM. 2012. The role of sex hormones in rheumatoid arthritis. International Journal of Pharmacy and Pharmaceutical Sciences 4(1): 15-21.
Clancy J, Hasthorpe H. 2011. Pathophysiology of rheumatoid arthritis: nature or nurture? Primary Health Care 21(9): 31-38.
Holroyd CR, Edwards CJ. 2009. The effects of hormone replacement therapy on autoimmune disease: rheumatoid arthritis and systemic lupus erythematosus. Climacteric 2: 378-386.
Islander U, Jochems C, Lagerquist MK, Forsblad-d’Elia H, Carlsten H. 2011. Estrogens in rheumatoid arthritis; the immune system and bone. Molecular and Cellular Endocrinology 335: 14-29.
1. http://www.metrohealth.org/body.cfm?id=1611&oTopID=1604 2.http://images.rheumatology.org/viewphoto.php?
imageId=2862487&albumId=75692 3. http://www.medicinenet.com/rheumatoid_arthritis/article.htm 4.http://images.rheumatology.org/viewphoto.php?
imageId=2862491&albumId=75692
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Why does estrogen inhibit Treg cells? A) Treg cells have a greater proportion
of ERα/ERβ receptors causing Treg cell function to be suppressed
B) Estrogen blocks the CD4 receptor on the surface of the Treg cell
C) Estrogen inhibits successful Treg development within the bone marrow
D) Estrogen blocks the binding of B7 on autoreactive T cells to Treg cells, thus inhibiting necessary suppression
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In patients with RA, what specific type of tissue is affected and why?
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