Barraquer–Simons syndrome

Barraquer–Simons syndrome
Classification and external resources
ICD-10 272.6
OMIM 608709
DiseasesDB 9697
Orphanet 79087

Barraquer–Simons syndrome (or acquired partial lipodystrophy,[1] cephalothoracic lipodystrophy,[1] and progressive lipodystrophy)[1]) is a rare form of lipodystrophy, which usually first affects the head, and then spreads to the thorax.[2][3]

It is named for Luis Barraquer Roviralta (1855–1928), a Spanish physician, and Arthur Simons (1879–1942), a German physician.[4][5][6]Some evidence links it to LMNB2.[7]

Causes

The etiology of this condition has not been fully elucidated.[8] Lipodystrophy is often associated with glomerulonephritis, low C3 serum complement levels, and the presence of a C3 nephritic factor. C3 nephritic factor is a serum immunoglobulin G that interacts with the C3bBb alternative pathway convertase to activate C3. C3 nephritic factor induces the lysis of adipocytes that secrete adipsin, a product identical to complement factor D. The distribution of the lipoatrophy is postulated to be dictated by the variable amounts of adipsin secreted by the adipocytes at different locations.

Human PTRF mutations may cause secondary deficiency of caveolins, resulting in generalized lipodystrophy in association with in muscular dystrophy. Complement dysfunction may predispose some patients to bacterial infections.[9]

Diagnosis

The diagnosis of the disease is mainly clinical (see diagnostic criteria). A laboratory workup is needed primarily to investigate for the presence of associated disorders (metabolic, autoimmune, and renal diseases).[9]

Laboratory work for associated diseases includes:

As a confirmatory test, whole-body MRI usually clearly demonstrates the extent of lipodystrophy. MRI is not recommended on a routine basis.

Diagnostic criteria and presentation

A review published in 2004, which was based on 35 patients seen by the respective authors over 8 years and also a literature review of 220 cases of acquired partial lipodystrophy (APL), proposed an essential diagnostic criterion.[10] Based on the review and the authors experience, they proposed that APL presents as a gradual onset of bilaterally symmetrical loss of subcutaneous fat from the face, neck, upper extremities, thorax, and abdomen, in the "cephalocaudal" sequence, sparing the lower extremities. The median age of the onset of lipodystrophy was seven years. Several autoimmune diseases, in particular systemic lupus erythematosus and dermatomyositis, were associated with APL. The prevalence rates of diabetes mellitus and impaired glucose tolerance were 6.7% and 8.9%, respectively. Around 83% of APL patients had low complement 3 (C3) levels and the presence of polyclonal immunoglobulin C3 nephritic factor. About 22% of patients developed membranoproliferative glomerulonephritis (MPGN) after a median of about 8 years following the onset of lipodystrophy. Compared with patients without renal disease, those with MPGN had earlier age of onset of lipodystrophy (12.6 ± 10.3 yr vs 7.7 ± 4.4 yr, respectively; p < 0.001) and a higher prevalence of C3 hypocomplementemia (78% vs 95%, respectively; p = 0.02).

The adipose stores of the gluteal regions and lower extremities (including soles) tend to be either preserved or increased, particularly among women.[11] Variable fat loss of the palms, but no loss of intramarrow or retro-orbital fat, has been demonstrated.

Treatment

In general, treatment for acquired partial lipodystrophy is limited to cosmetic, dietary, or medical options.[9] Currently, no effective treatment exists to halt its progression.

Diet therapy has been shown to be of some value in the control of metabolic problems. The use of small, frequent feedings and partial substitution of medium-chain triglycerides for polyunsaturated fats appears to be beneficial.

Plastic surgery with implants of monolithic silicon rubber for correction of the deficient soft tissue of the face has been shown to be effective. False teeth may be useful in some cases for cosmetic reasons. Long-term treatment usually involves therapy for kidney and endocrine dysfunction.

Data on medications for APL are very limited. Thiazolidinediones have been used in the management of various types of lipodystrophies. They bind to peroxisome proliferator-activator receptor gamma (PPAR-gamma), which stimulates the transcription of genes responsible for growth and differentiation of adipocytes. A single report has suggested a beneficial effect from treatment with rosiglitazone on fat distribution in acquired partial lipodystrophy; however, preferential fat gain was in the lower body.

Direct drug therapy is administered according to the associated condition. Membranoproliferative glomerulonephritis and the presence of renal dysfunction largely determine the prognosis of acquired partial lipodystrophy. Standard guidelines for the management of renal disease should be followed. The course of membranoproliferative glomerulonephritis in acquired partial lipodystrophy has not been significantly altered by treatment with corticosteroids or cytotoxic medications. Recurrent bacterial infections, if severe, might be managed with prophylactic antibiotics.

Prognosis

Estimating the mortality rate based on the available literature is difficult.[9] Several case reports have revealed an association between acquired partial lipodystrophy and other diseases.

Nephropathy, in the form of membranoproliferative glomerulonephritis, occurs in about 20% of patients. Usually, patients do not have clinically evident renal disease or abnormalities in renal function until they have had the disease for 8 or more years. Membranoproliferative glomerulonephritis usually presents with asymptomatic proteinuria or hematuria.

The disease may gradually progress. About 40-50% of patients develop end-stage renal disease over the course of 10 years. This condition is responsible for most recurrent hospital admissions in patients with acquired partial lipodystrophy. Rapid progression of renal disease in a pregnant patient was reported. Recurrent disease in transplanted kidneys is common, although there have been reports of successful transplantations.

Associated autoimmune diseases (e.g., systemic lupus erythematosus, thyroiditis) contribute significantly to increased morbidity in these patients compared with the general population. Although uncommon, insulin resistance increases cardiovascular risk. Susceptibility to bacterial infections probably results from a C3 deficiency (due to complement activation and consumption of C3). Low C3 levels may impair complement-mediated phagocytosis and bacterial killing.

Epidemiology

Around 250 cases have been reported since the recognition of this syndrome.[9] It is a rare syndrome with no known prevalence, although it is more common than the generalized form of acquired lipodystrophy (Lawrence syndrome).

See also

References

  1. 1 2 3 Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0.
  2. Ferrarini A, Milani D, Bottigelli M, Cagnoli G, Selicorni A (2004). "Two new cases of Barraquer–Simons syndrome". Am. J. Med. Genet. A. 126 (4): 427–429. PMID 15098243. doi:10.1002/ajmg.a.20623.
  3. Brniteanu DD, Zbranca E (2000). "Barraquer–Simons syndrome. Report of a case and review of the literature". Revista medico-chirurgical a Societii de Medici i Naturaliti din Iai. 104 (2): 155–158. PMID 12089983.
  4. synd/1565 at Who Named It?
  5. L. Barraquer Roviralta. Histoire clinique d'un cas d'atrophie du tissue cellulo-adipeux. Barcelona, 1906.
  6. A. Simons. Eine seltene Trophoneurose ("Lipodystrophia progressiva"). Zeitschrift fr die gesamte Neurologie und Psychiatrie, Berlin, 1911, 5: 29–38.
  7. Hegele RA, Cao H, Liu DM, et al. (2006). "Sequencing of the reannotated LMNB2 gene reveals novel mutations in patients with acquired partial lipodystrophy". Am. J. Hum. Genet. 79 (2): 383–389. PMC 1559499Freely accessible. PMID 16826530. doi:10.1086/505885.
  8. Schwartz Robert. "eMedicine – Lipodystrophy, Progressive". Retrieved 2013-05-03.
  9. 1 2 3 4 5 Griffing, George T. "eMedicine- Acquired Partial Lipodystrophy". Retrieved 2013-05-03.
  10. Misra A.; Peethambaram A.; Garg A. (2004). "Clinical features and metabolic and autoimmune derangements in acquired partial lipodystrophy: report of 35 cases and review of the literature". Medicine (Baltimore). 83 (1): 18–34. PMID 14747765. doi:10.1097/01.md.0000111061.69212.59.
  11. Hegele RA, Joy TR, Al-Attar SA, Rutt BK (Jul 2007). "Thematic review series: Adipocyte Biology. Lipodystrophies: windows on adipose biology and metabolism". J Lipid Res. 48 (7): 1433–44. PMID 17374881. doi:10.1194/jlr.R700004-JLR200.
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