This article is about the disease. For the mushroom, see Scleroderma (fungus).
Not to be confused with scleredema.
| Scleroderma |
|
| A type of localized scleroderma known as morphea |
| Specialty |
Rheumatology |
| Usual onset |
Middle age[1] |
| Types |
Localized, systemic scleroderma[2] |
| Causes |
Unknown[2] |
| Risk factors |
Family history, certain genetic factors, exposure to silica[3][4][5] |
| Diagnostic method |
Based on symptoms, skin biopsy, blood tests[6] |
| Similar conditions |
Mixed connective tissue disease, systemic lupus erythematosus, polymyositis, dermatomyositis[1] |
| Treatment |
Supportive care[1] |
| Medication |
Corticosteroids, methotrexate, non-steroidal anti-inflammatory drugs (NSAIDs)[2] |
| Prognosis |
Localized: Normal life expectancy[7]
Systemic: Decreased life expectancy[3] |
| Frequency |
3 per 100,000 per year (systemic)[3] |
|
[edit on Wikidata]
|
Scleroderma is a group of autoimmune diseases that may result in changes to the skin, blood vessels, muscles, and internal organs.[2][6] The disease can be either localized to the skin or involve other organs in addition to the skin.[2] Symptoms may include areas of thickened skin, stiffness, feeling tired, and poor blood flow to the fingers or toes with cold exposure.[1] One form of the condition, known as CREST syndrome, classically results in calcium deposits, Raynaud's syndrome, esophageal problems, thickening of the skin of the fingers and toes, and areas of small dilated blood vessels.[1]
The cause is unknown, however, some suspect it may be due to an abnormal immune response.[2] Risk factors include family history, certain genetic factors, and exposure to silica.[3][4][5] The underlying mechanism involves the abnormal growth of connective tissue which is believed to occur as a result of the body's immune system attacking healthy tissues.[6] Diagnosis is typically based on a person's symptoms and may be supported by a skin biopsy or blood tests.[6]
While there is no cure, treatments may improve symptoms.[2] Medications used include corticosteroids, methotrexate, and non-steroidal anti-inflammatory drugs (NSAIDs).[2] Outcomes depend on the extent of disease.[3] Those with localized disease generally have a normal life expectancy.[7] In those with systemic disease typical life expectancy is about 11 years from onset.[3] Death is often due to lung, gastrointestinal, or heart complications.[3]
About 3 per 100,000 people develop the systemic form a year.[3] The condition most often begins in middle age.[1] Women are more often affected than men.[1] Scleroderma was likely first described in 1753 by Carlo Curzio[8] and then well documented in 1842.[9] The term is from the Greek "sklerosis" meaning "hardness" and "derma" meaning "skin".[6]
Contents
- 1 Signs and symptoms
- 2 Cause
- 3 Pathophysiology
- 4 Diagnosis
- 4.1 Differential
- 4.2 Classification
- 5 Treatment
- 6 Prognosis
- 7 Epidemiology
- 8 Pregnancy
- 9 See also
- 10 References
- 11 External links
Signs and symptoms
Arm of a person with scleroderma showing skin lesions
Potential signs and symptoms include:[10][11][12]
- Cardiovascular: Raynaud's phenomenon (is the presenting symptom in 30% of affected persons, occurs in 95% of affected individuals at some time during their illness); healed pitting ulcers on the fingertips; skin and mucosal telangiectasis; palpitations, irregular heart rate and fainting due to conduction abnormalities, hypertension and congestive heart failure.
- Digestive: gastroesophageal reflux disease, bloating, indigestion, loss of appetite, diarrhoea alternating with constipation, sicca syndrome and its complications, loosening of teeth and hoarseness (due to acid reflux).
- Pulmonary: progressive worsening of shortness of breath, chest pain (due to pulmonary artery hypertension) and dry, persistent cough due to interstitial lung disease.
- Musculoskeletal: joint, muscle aches, loss of joint range of motion, carpal tunnel syndrome and muscle weakness.
- Genitourinary: erectile dysfunction, dyspareunia, scleroderma renal crises and kidney failure.
- Other: facial pain due to trigeminal neuralgia, hand paresthesias, headache, stroke, fatigue, calcinosis and weight loss.
Cause
Scleroderma is caused by genetic and environmental factors.[13][5][4][14] Mutations in HLA genes seem to play a crucial role in the pathogenesis of some cases (but not all), likewise silica, aromatic and chlorinated solvents, ketones, trichloroethylene, welding fumes and white spirits exposure seems to contribute to the condition in a small proportion of affected persons.[13][5][4][14][15]
Pathophysiology
It is characterised by increased synthesis of collagen (leading to the sclerosis), damage to small blood vessels, activation of T lymphocytes and production of altered connective tissues.[16] Its proposed pathogenesis is the following:[17][18][19][20][21]
- It begins with an inciting event at the level of the vasculature, probably the endothelium. The inciting event is yet to be elucidated but may be a viral agent, oxidative stress or autoimmune. Endothelial cell damage and apoptosis ensue, leading to the vascular leakiness that manifests in early clinical stages as tissue oedema. At this stage it is predominantly a Th1 and Th17-mediated disease.
- After this the vasculature is further compromised by impaired angiogenesis and impaired vasculogenesis (fewer endothelial progenitor cells), likely related to the presence of antiendothelinal cell antibodies (AECA). Despite this impaired angiogenesis, elevated levels of pro-angiogenic growth factors like PDGF and VEGF is often seen in persons with the condition. The balance of vasodilation and vasoconstriction becomes off-balance and the net result is vasoconstriction. The damaged endothelium then serves as a point of origin for blood clot formation and further contributes to ischaemia-reperfusion injury and the generation of reactive oxygen species. These later stages are characterised by Th2 polarity.
- The damaged endothelium upregulates adhesion molecules and chemokines to attract leucocytes, which enables the development of innate and adaptive immune responses, including loss of tolerance to various oxidised antigens, which includes topoisomerase I. B cells mature into plasma cells, which furthers the autoimmune component of the condition. T cells differentiate into subsets, including Th2 cells, which play a vital role in tissue fibrosis. Anti–topoisomerase 1 antibodies, in turn, stimulate type I interferon production.
- Fibroblasts are recruited and activated by multiple cytokines and growth factors to generate myofibroblasts. Dysregulated transforming growth factor β (TGF-β) signalling in fibroblasts and myofibroblasts has been observed in multiple studies of scleroderma-affected individuals. Activation of fibroblasts and myofibroblasts leads to excessive deposition of collagen and other related proteins, leading to fibrosis. B cells are implicated in this stage, IL-6 and TGF-β produced by the B cells decrease collagen degradation and increase extracellular matrix production. Endothelin signalling is implicated in the pathophysiology of fibrosis.[22]
Vitamin D is implicated in the pathophysiology of the disease. An inverse correlation between plasma levels of vitamin D and scleroderma severity has been noted and vitamin D is known to play a crucial role in regulating (usually suppressing) the actions of the immune system.[23]
Diagnosis
Typical scleroderma is classically defined as symmetrical skin thickening, with about 70% of cases also presenting with Raynaud's phenomenon, nail-fold capillary changes and antinuclear antibodies. Affected individuals may or may not experience systemic organ involvement. There is no single test for scleroderma that works all of the time and hence the diagnosis is often a matter of exclusion. Atypical scleroderma may show any variation of these changes without skin changes or with finger swelling only.[24]
Laboratory testing can show antitopoisomerase antibodies, like anti-scl70 (causing a diffuse systemic form), or anticentromere antibodies (causing a limited systemic form and the CREST syndrome). Other autoantibodies can be seen, such as anti-U3 or anti-RNA polymerase.[25]
Differential
Diseases that are often in the differential include:[26]
- Eosinophilia, a condition in which there are too many eosinophils (a type of immune cell that attacks parasites and is involved in certain allergic reactions) in the blood.
- Eosinophilia-myalgia syndrome, a form of eosinophilia that is caused by L-tryptophan supplements.
- Eosinophilic fasciitis, a disease that affects the connective tissues surrounding skeletal muscles, bones, blood vessels and nerves in the arms and legs.
- Graft-versus-host disease, an autoimmune condition that occurs as a result of bone marrow transplants in which the immune cells from the transplanted bone marrow attack the host's body.
- Mycosis fungoides, a type of cutaneous T cell lymphoma, a rare cancer that causes rashes all over the body.
- Nephrogenic systemic fibrosis, a condition usually caused by kidney failure that causes fibrosis (thickening) of the tissues.
- Primary biliary cirrhosis, an autoimmune disease of the liver.
- Primary pulmonary hypertension
- Complex regional pain syndrome
Classification
Scleroderma is characterised by the appearance of circumscribed or diffuse, hard, smooth, ivory-colored areas that are immobile and which give the appearance of hidebound skin, a disease occurring in both localised and systemic forms:[27]
- Localised scleroderma
- Localised morphea
- Morphea-lichen sclerosus et atrophicus overlap
- Generalised morphea
- Atrophoderma of Pasini and Pierini
- Pansclerotic morphea
- Morphea profunda
- Linear scleroderma
- Systemic scleroderma
- CREST syndrome
- Progressive systemic sclerosis
Treatment
There is no cure for scleroderma, although relief of symptoms is often achieved. These include[10][28]
- Raynaud's phenomenon with vasodilators such as calcium channel blockers, alpha blockers, serotonin receptor antagonists, angiotensin II receptor inhibitors, statins, local nitrates or iloprost
- Digital ulcers with phosphodiesterase 5 inhibitors (e.g., sildenafil) or iloprost
- Prevention of new digital ulcers with bosentan
- Malnutrition, secondary to intestinal flora overgrowth with tetracycline antibiotics like tetracycline
- Interstitial lung disease with cyclophosphamide, azathioprine with or without corticosteroids
- Pulmonary arterial hypertension with endothelin receptor antagonists, phosphodiesterase 5 inhibitors and prostanoids
- Gastrooesophageal reflux disease with antacids or prokinetics
- Kidney crises with angiotensin converting enzyme inhibitors and angiotensin II receptor antagonists
Systemic disease-modifying treatment with immunosuppressants is often used.[13][29][30][31][32][33] Immunosuppressants used in its treatment include azathioprine, methotrexate, cyclophosphamide, mycophenolate, intravenous immunoglobulin, rituximab, sirolimus, alefacept and the tyrosine kinase inhibitors, imatinib, nilotinib and dasatinib.[13][28][29][30][31][32][33][34]
Experimental therapies under investigation include endothelin receptor antagonsits, tyrosine kinase inhibitors, beta-glycan peptides, halofuginone, basiliximab, alemtuzumab, abatacept and haematopoietic stem cell transplantation.[35][36]
| Immunomodulatory agents in the treatment of scleroderma |
| INN |
Mechanism of action[37][38] |
Route of administration[37] |
Pregnancy category[37][39] |
Major toxicities[37] |
| Alefacept |
Monoclonal antibody to inhibit T lymphocyte activation by binding to CD2 portion of human leukocyte function antigen-3. |
IM |
B (US) |
Malignancies, injection site reactions, blood clots, lymphopenia, hepatotoxicity and infections. |
| Azathioprine |
Purine analogue that inhibits lymphocyte proliferation via conversion to mercaptopurine |
PO, IV |
D (Au) |
Myelosuppression and rarely malignancy, hepatitis, infection, hepatic sinusoidal obstruction syndrome and hypersensitivity reactions. |
| Cyclophosphamide |
Nitrogen mustard that cross-links DNA base pairs, leading to breakages and triggering apoptosis in haematopoietic cells. |
PO, IV |
D (Au) |
Vomiting, myelosuppression, haemorrhagic cystitis and rarely heart failure, pulmonary fibrosis, hepatic sinusoidal obstruction syndrome, malignancy and SIADH. |
| Dasatinib |
Tyrosine kinase inhibitor against various pro-angiogenic growth factors (including PDGF and VEGF). |
PO |
D (Au) |
Fluid retention, myelosuppression, haemorrhage, infections, pulmonary hypertension, electrolyte anomalies and uncommonly hepatotoxicity, heart dysfunction/failure, myocardial infarction, QT interval prolongation, renal failure and hypersensitivity. |
| Imatinib |
As above. |
PO |
D (Au) |
As above and rarely: GI perforation, avascaular necrosis and rhabdomyolysis. |
| Immunoglobulin |
Immunoglobulin, modulates the immune system. |
IV |
N/A |
Varies. |
| Methotrexate |
Antifolate; inhibits dihydrofolate reductase. |
PO, IV, IM, SC, IT |
D (Au) |
Myeosuppression, pulmonary toxicity, hepatotoxicity, neurotoxicity and rarely kidney failure, hypersensitivity reactions, skin and bone necrosis and osteoporosis. |
| Mycophenolate |
Inosine monophosphate dehydrogenase inhibitor, leading to reduced purine biosynthesis in lymphocytes. |
PO, IV |
D (Au) |
Myelosuppression, blood clots, less commonly GI perforation/haemorrhage and rarely pancreatitis, hepatitis, aplastic anaemia and pure red cell aplasia. |
| Nilotinib |
As per dasatinib. |
PO |
D (Au) |
As per imatinib. |
| Rituximab |
Monoclonal antibody against CD20 which is expressed on B lymphocytes. |
IV |
C (Au) |
Infusion-related reactions, infection, neutropenia, reduced immunoglobulin levels, arrhythmias, less commonly anaemia, thrombocytopenia, angina, myocardial infarction, heart failure and rarely haemolytic anaemia, aplastic anaemia, serum sickness, severe skin conditions, pulmonary infiltrates, pneumonitis, cranial neuropathy (vision or hearing loss) and progressive multifocal leucoencephalopathy. |
| Sirolimus |
mTOR inhibitor, thereby reducing cytokine-induced lymphocyte proliferation. |
PO |
C (Au) |
Neutropenia, hypokalaemia, interstitial lung disease, pericardial effusion, pleural effusion, less commonly pulmonary haemorrhage, nephrotic syndrome and rarely hepatotoxicity and lymphoedema. |
|
PO = Oral. IV = Intravenous. IM = Intramuscular. SC = Subcutaneous. IT = Intrathecal.
The preferred pregnancy category, above, is Australian, if available. If unavailable an American one is substituted.
|
Prognosis
The 5-year survival rate for scleroderma is about 85%, whereas the 10-year survival rate is less than 70%.[40] This varies according to the subtype; for instance, persons with limited skin disease have a 10-year survival rate of 71%, whereas the outlook for patients with systemic scleroderma has generally improved over the years. Ten-year survival rates rose from 54% in 1972 to 66% in 2001[41] The major causes of death in persons with scleroderma are: pulmonary hypertension, pulmonary fibrosis and scleroderma renal crisis.[25] People with scleroderma are also at a heightened risk for contracting cancers (especially liver, lung, haematologic and bladder cancers) and, perhaps, cardiovascular disease.[42][43][44][45][46][47]
Epidemiology
Scleroderma most commonly first presents between the ages of 20 and 50 years, although any age group can be affected.[25][10] Women are four to nine times more likely to develop scleroderma than men.[25]
This disease is found worldwide.[25] In the United States, prevalence is estimated at 240 per million and the annual incidence of scleroderma is 19 per million people.[25] Likewise in the United States, it is slightly more common in African Americans than in their white counterparts, Scleroderma occurs much more often in women than it does in men. Choctaw Native Americans are more likely than Americans of European descent to develop the type of scleroderma that affects internal organs.[25] In Germany, the prevalence is between 10 and 150 per million people, and the annual incidence is between 3 and 28 per million people.[40] In South Australia, the annual incidence is 23 per million people, and the prevalence 233 per million people.[48] Scleroderma is less common in the Asian population.[49]
Pregnancy
Scleroderma in pregnancy is a complex situation; it increases the risk to both mother and child.[50] Overall scleroderma is associated with reduced fetal weight for gestational age.[50] The treatment for scleroderma often includes known teratogens such as cyclophosphamide, methotrexate, mycophenolate, etc. and hence careful avoidance of such drugs during pregnancy is advised.[50] In these cases hydroxychloroquine and low-dose corticosteroids might be used for disease control.[50]
See also
- Congenital fascial dystrophy
References
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External links
| Classification |
V · T · D
- ICD-10: L94.0-L94.1, M34
- ICD-9-CM: 701.0 710.1
|
| External resources |
|
- Handout on Health: Scleroderma - US National Institute of Arthritis and Musculoskeletal and Skin Diseases
|
Cutaneous keratosis, ulcer, atrophy, and necrobiosis (L82–L94, 700–701.5)
|
| Epidermal thickening |
- keratoderma: Keratoderma climactericum
- Paraneoplastic keratoderma
- Acrokeratosis paraneoplastica of Bazex
- Aquagenic keratoderma
- Drug-induced keratoderma
- psoriasis
- Keratoderma blennorrhagicum
- keratosis: Seborrheic keratosis
- Clonal seborrheic keratosis
- Common seborrheic keratosis
- Irritated seborrheic keratosis
- Seborrheic keratosis with squamous atypia
- Reticulated seborrheic keratosis
- Dermatosis papulosa nigra
- Keratosis punctata of the palmar creases
- other hyperkeratosis: Acanthosis nigricans
- Confluent and reticulated papillomatosis
- Callus
- Ichthyosis acquisita
- Arsenical keratosis
- Chronic scar keratosis
- Hyperkeratosis lenticularis perstans
- Hydrocarbon keratosis
- Hyperkeratosis of the nipple and areola
- Inverted follicular keratosis
- Lichenoid keratosis
- Multiple minute digitate hyperkeratosis
- PUVA keratosis
- Reactional keratosis
- Stucco keratosis
- Thermal keratosis
- Viral keratosis
- Warty dyskeratoma
- Waxy keratosis of childhood
- other hypertrophy: Keloid
- Hypertrophic scar
- Cutis verticis gyrata
|
| Necrobiosis/granuloma |
| Necrobiotic/palisading |
- Granuloma annulare
- Perforating
- Generalized
- Subcutaneous
- Granuloma annulare in HIV disease
- Localized granuloma annulare
- Patch-type granuloma annulare
- Necrobiosis lipoidica
- Annular elastolytic giant cell granuloma
- Granuloma multiforme
- Necrobiotic xanthogranuloma
- Palisaded neutrophilic and granulomatous dermatitis
- Rheumatoid nodulosis
- Interstitial granulomatous dermatitis/Interstitial granulomatous drug reaction
|
| Foreign body granuloma |
- Beryllium granuloma
- Mercury granuloma
- Silica granuloma
- Silicone granuloma
- Zirconium granuloma
- Soot tattoo
- Tattoo
- Carbon stain
|
| Other/ungrouped |
|
|
Dermis/
localized CTD |
Cutaneous lupus
erythematosus |
- chronic: Discoid
- Panniculitis
- ungrouped: Chilblain
- Lupus erythematosus–lichen planus overlap syndrome
- Tumid
- Verrucous
- Rowell's syndrome
|
Scleroderma/
Morphea |
- Localized scleroderma
- Localized morphea
- Morphea–lichen sclerosus et atrophicus overlap
- Generalized morphea
- Atrophoderma of Pasini and Pierini
- Pansclerotic morphea
- Morphea profunda
- Linear scleroderma
|
Atrophic/
atrophoderma |
- Lichen sclerosus
- Anetoderma
- Schweninger–Buzzi anetoderma
- Jadassohn–Pellizzari anetoderma
- Atrophoderma of Pasini and Pierini
- Acrodermatitis chronica atrophicans
- Semicircular lipoatrophy
- Follicular atrophoderma
- Linear atrophoderma of Moulin
|
| Perforating |
- Kyrle disease
- Reactive perforating collagenosis
- Elastosis perforans serpiginosa
- Perforating folliculitis
- Acquired perforating dermatosis
|
| Skin ulcer |
|
| Other |
- Calcinosis cutis
- Sclerodactyly
- Poikiloderma vasculare atrophicans
- Ainhum/Pseudo-ainhum
|
|
|
Systemic connective tissue disorders (M32–M36, 710)
|
| General |
| Systemic lupus erythematosus |
- Drug-induced SLE
- Libman–Sacks endocarditis
|
| Inflammatory myopathy |
- Myositis
- Dermatopolymyositis
- Dermatomyositis/Juvenile dermatomyositis
- Polymyositis* Inclusion body myositis
|
| Scleroderma |
- Systemic scleroderma
- Progressive systemic sclerosis
- CREST syndrome
|
- Overlap syndrome / Mixed connective tissue disease
|
|
| Other hypersensitivity/autoimmune |
|
| Other |
- Behçet's disease
- Polymyalgia rheumatica
- Eosinophilic fasciitis
- Eosinophilia–myalgia syndrome
- fibrillin
- Marfan syndrome
- Congenital contractural arachnodactyly
|