Scholarly article on topic 'Caution Should be Used in the Recognition of Adult-Onset Autoinflammatory Disorders: Facts or Fiction?'

Caution Should be Used in the Recognition of Adult-Onset Autoinflammatory Disorders: Facts or Fiction? Academic research paper on "Clinical medicine"

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Academic research paper on topic "Caution Should be Used in the Recognition of Adult-Onset Autoinflammatory Disorders: Facts or Fiction?"

tamferg DOT IMMUNOLOGY

OPiNiON ARTiCLE

published: 23 April 2013 doi: 10.3389/fimmu.2013.00096

Caution should be used in the recognition of adult-onset autoinflammatory disorders: facts or fiction?

Luca Cantarini1*, Orso Maria Lucherini1 and Donato Rigante2

' Research Center of Systemic Autoimmune and Autoinflammatory Diseases, Unit of Rheumatology, Poiiciinico Le Scotte, University of Siena, Siena, Italy 2 Institute of Pediatrics, Université Cattoiica Sacro Cuore, Rome, Italy *Correspondence: cantariniiuca@hotmaii.com Edited by:

Uday Kishore, Brunei University, UK Reviewed by:

Uday Kishore, Brunei University, UK

Autoinflammatory disorders (AIDs) are a group of inherited diseases of innate immunity, characterized by seemingly unprovoked inflammation recurring with variable rhythmicity and involving skin, serosal membranes, synovial membranes, and gastrointestinal tube, with reactive amyloidosis as a potential severe long-term complication (Touitou and Kone-Paut, 2008). They can be categorized in hereditary monogenic disorders and multi-factorial polygenic disorders, encompassing an expanding number of conditions, as the well-known periodic fever, aphthosis, pharyngitis, and adenitis (PFAPA) syndrome (Masters et al., 2009).

Monogenic AIDs are caused by mutations in genes encoding proteins involved in the regulation or activation of the inflammatory response, and include familial Mediterranean fever (FMF), tumor necrosis factor receptor-associated periodic syndrome (TRAPS), mevalonate kinase deficiency syndrome, the family of cryopyrin-associated periodic syndromes (CAPS), which in turn include familial cold autoinflammatory syndrome (FCAS), Muckle-Wells syndrome and neonatal onset multisystem inflammatory disease, NLRP12-associated autoinflammatory disorder (NLRP 12AD), PAPA (pyogenic arthritis, pyoderma gangrenosum, acne) syndrome, Majeed's syndrome, deficiency of interleukin-1 receptor antagonist, and -lastly - Blau's syndrome. Recurrent multidistrict inflammatory flares, which typically alternate with symptom-free intervals characterized by complete well-being and normalization of acute phase reactants, are the most striking marker of AIDs. The vast majority of these conditions are related to the activation of the interleukin-1 pathway, which results in a unifying common pathogenetic mechanism (Rigante, 2012). Table 1

summarizes their genetic characteristics, inheritance patterns, and the most peculiar clinical manifestations. The recognition of AIDs derives from the combination of clinical data, evaluation of acute phase reactants, clinical efficacy in response to specific drugs, and identification of specific mutations in the causative genes (Federici et al., 2006; Gattorno et al., 2008; Cantarini et al., 2010a, 2011, 2012a,b; Muscari et al., 2012). Genetic testing remains a feasible tool to corroborate the clinical diagnosis of AIDs.

Most of these disorders are manifest in childhood, but a certain number of patients may experience disease onset during adulthood. To date, among monogenic AIDs a late disease onset has been described in FMF (Sohar et al., 1967; Sayarlioglu et al., 2005; Cantarini et al., 2010b), TRAPS (Aksentijevich et al., 2001; Dodé et al., 2002; Aganna et al., 2003; Cantarini et al., 2012c), CAPS (Vitale et al., 2012), and NLRP12AD (Borghini et al., 2011).

Adult-onset FMF is fairly rare, however it has been reported as late as age 65 (Cantarini et al., 2010b), and advanced age is not an exclusion criterion (Livneh et al., 1997): this picture is mainly related to low-penetrance mutations, giving rise to a milder disease, generally similar to that of younger patients (Sayarlioglu et al., 2005).

On the contrary, a more significant variability in terms of clinical phenotype may be observed in TRAPS (Aksentijevich et al., 2001; Dodé et al., 2002; Aganna et al., 2003; Ravet et al., 2006; Cantarini et al., 2009, 2010c,d,e,f,g; Rigante et al., 2011; Brizi et al., 2012): this heterogeneity is largely related to the wide spectrum of known TNFRSF1A mutations, which can be distinguished into high-penetrance and low-pen-etrance variants (Touitou et al., 2004). As in FMF, adult-onset of symptoms is usually

related to low-penetrance mutations, which are associated with feeble clinical signs and a lower risk of amyloidosis (Aksentijevich et al., 2001; Dode et al., 2002; Aganna et al., 2003). In addition, TRAPS patients carrying low-penetrance TNFRSF1A variants may show atypical clinical manifestations and symptoms that mimic other AIDs and/or autoimmune diseases, such as idiopathic recurrent acute pericarditis, thus hindering differential diagnosis (Cantarini et al., 2009, 2010d,e,g, 2012a; Rigante et al., 2011). These alleles have also been described in patients with recurrent inflammatory attacks who lack the most typical TRAPS manifestations, even when the duration of fever episodes is short and might resemble FMF, and even in healthy controls (Dode et al., 2002; Ravet et al., 2006; Cantarini et al., 2010a, 2011; Muscari et al., 2012). Their pathogenetic role and the genotype-phenotype correlation are still a huge matter of debate. Moreover, the absence of segregation in some families suggests the existence of other genes with a non-permissive power on AIDs expression (D'Osualdo et al., 2006).

On the other hand, CAPS are primarily characterized by the onset of symptoms during early-infancy: nevertheless, we have recently described a case series of patients presenting FCAS-like symptoms, carrying the low-penetrance Q703K mutation in the NLRP3 gene, all characterized by disease onset during adulthood, and with clinical manifestations triggered or worsened by cold exposure (Vitale et al., 2012). Other NLRP3 mutations of unknown pathoge-netic significance can also be found both in patients with recurrent inflammatory attacks and in healthy controls: thus, their causal role remains doubtful and the question of whether these variants are

Table 1 | Summary of the main genetic and clinical features of monogenic autoinflammatory disorders.

Disease Gene locus Protein Inheritance Prominent clinical features

FMF MEFV 16p13.3 Pyrin AR Fever, serositis, arthralgias or arthritides, erysipelas-like eruption on the legs, amyloidosis in untreated or resistant or non-compliant patients

TRAPS TNFRSF1A Tumor necrosis AD Fever, migrating muscle and joint involvement, arthralgias or arthritides, serosal

12p13 factor receptor 1 involvement, steroid responsiveness of febrile attacks, conjunctivitis, periorbital edema, amyloidosis

MKD MVK 12q24 Mevalonate kinase AR Fever, polymorphous rash, arthralgias, abdominal pain, diarrhea, lymphnode enlargement, headache, splenomegaly, oral aphthosis

FCAS Fever, cold-induced urticaria-like rash, conjunctivitis, arthralgias

MWS NOMID NLRP31q44 Cryopyrin AD Fever, urticaria-like rash, conjunctivitis, arthralgias, neurosensorial deafness, amyloidosis Fever, urticaria-like rash, uveitis, papilledema, deforming arthritides involving large joints (knees), aseptic chronic meningopathy, neurosensorial deafness, amyloidosis

NLRP12AD NLRP12 19q13 Monarch-1 AD Fever, arthralgias, cold-induced urticaria-like rash

BS NOD2 (CARD15 16q12.1-13 NOD2 AD Granulomatous dermatitis with ichthyosis-like changes, granulomatous polyarthritis, camptodactyly, recurrent panuveitis, intermittent fevers

PAPAs PSTPIP1 15q24-q25.1 CD2 antigen-binding protein 1 AD Pyoderma gangrenosum, cystic acne, sterile pyogenic oligoarthritis

MS LPIN2 18p11.31 Lipin 2 AR Recurrent multifocal osteomyelitis, dyserythropoietic anemia, neutrophilic chronic dermatosis

DIRA IL1RN 2q14 Interleukin-1 receptor antagonist AR Multifocal osteomyelitis, diffuse pustular rash with neonatal onset

FMF, familial Mediterranean fever; TRAPS, tumor necrosis factor receptor-associated periodic syndrome; MKD, mevalonate kinase deficiency syndrome; FCAS, familial cold autoinflammatory syndrome; MWS, Muckle-Wells syndrome; NOMID, neonatal onset multisystem inflammatory disease; NLRP12AD, NLRP12-associated autoinflammatory disorder; BS, Blau syndrome; PAPAs, pyogenic arthritis, pyoderma gangrenosum, acne syndrome; MS, Majeed syndrome; DIRA, deficiency of interleukin-1 receptor antagonist: AR, autosomal recessive: AD, autosomal dominant.

low-penetrance disease-associated mutations or asymptomatic polymorphisms has been often raised (Arostegui et al., 2004; Aksentijevich et al., 2007; Verma et al., 2008). As in TRAPS, it has been suggested that these alleles might exert a possible proinflammatory effect, causing an inflammatory phenotype in concomitance with other eventual environmental and/or genetic factors.

Also NLRP12AD has been shown to be characterized by neonatal or early-infancy onset (Goldbach-Mansky, 2012). However, Borghini et al. (2011) have recently described a 32-year-old woman found to be a carrier of the D294E NLRP12 mutation: this patient experienced FCAS-like symptoms since the age of 20. In agreement with these findings, we recently diagnosed a 27-year-old Caucasian woman with NLRP12AD and this patient carried the F402L mutation presenting a daily low-grade fever (<38°C) since the age 22 (unpublished data). Hence, we underscore that patients carrying NLRP12 mutations might undoubtedly display a disease onset during adulthood.

The differential diagnosis of AIDs can be complicated by PFAPA syndrome, which frequently occurs in pediatric patients. This syndrome does not have a documented genetic basis, and spontaneous resolution of fever episodes is commonly observed a few years after symptom onset (Marshall et al., 1987, 1989; Thomas et al., 1999). Recent medical literature has included dozens of suspected cases in adults as well, suggesting that it should be taken into consideration also in adults (Cavuoto and Bonagura, 2008; Padeh et al., 2008; Colotto et al., 2011; Cantarini et al., 2012d,e; Cazzato et al., 2013).

In conclusion, although little data is available in the literature in comparison with the medical amount of clinical notes related to the pediatric population, the increasingly frequent reports of adult patients with AIDs is gradually allowing a more extensive and detailed information regarding their potential belated onset, genotype-phenotype correlations, overall prognosis, and management of therapy. Both a delayed diagnosis during adulthood and adult-onset of symptoms are more and more observed: in these cases the

presence of low-penetrance mutations, giving nuanced clinical pictures in comparison with children, can be advocated. Low-penetrance mutations may also be responsible for oligo-symptomatic diseases in some cases, and for the appearance of atypical clinical manifestations in others, but may even function as susceptibility alleles to inflammation, rather than disease-associated mutations (Dodé et al., 2002; Ravet et al., 2006; Cantarini et al., 2010d, 2012a). Indeed, we suggest caution in the interpretation of low-penetrance mutations in probands with suspected AIDs in order to avoid false positive diagnoses and overtreatment, given the high frequency of healthy carriers and the influence of additional, still unknown, genetic and/or environmental modifying factors.

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Received: 05 March 2013; accepted: 10 April 2013; published online: 23 April 2013.

Citation: Cantarini L, Lucherini OM and Rigante D (2013) Caution should be used in the recognition of adult-onset autoinflammatory disorders: facts or fiction? Front. Immunol. 4:96. doi: 10.3389/fimmu.2013.00096 This article was submitted to Frontiers in Molecular Innate Immunity, a specialty of Frontiers in Immunology. Copyright © 2013 Cantarini, Lucherini and Rigante. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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