- Case Report
- Open Access
Effect of anakinra on arthropathy in CINCA/NOMID syndrome
© Miyamae et al; licensee BioMed Central Ltd. 2010
- Received: 9 September 2009
- Accepted: 16 March 2010
- Published: 16 March 2010
CINCA/NOMID is an autoinflammatory disorder characterized by the triad of neonatal onset of cutaneous symptoms, chronic meningitis, and recurrent fever and it presents with distinctive osteoarthropathy, synovitis mainly of the large joints and overgrowth of epimetaphyseal cartilage, particularly of the long bones. The cartilage overgrowth eventually causes osseous overgrowth and deformity that persists beyond skeletal maturity and leads to limb length discrepancy, joint contracture, and early degenerative arthropathy. Autoinflammation in CAPS/NOMID has been proven to derive from excessive release of interleukin-1 (IL-1). It has been well documented that the IL-1 receptor antagonist anakinra (Kineret(R)) helps mitigate systemic inflammation in the disorder. However, a general consensus has not been reached on its beneficial effect on osteoarthropathy. The case of a girl with CINCA/NOMID syndrome who showed dramatic improvement of osteoarthropathy after anakinra treatment is reported. A 4-year-old girl suffered at the age of 10 months from a generalized urticarial skin lesion with recurrent episodes of fever and growth disorder. Blood examination revealed persistent massive neutrophilia, anemia and intense acute phase response. She manifested knee joint swelling with limited ROM when she was 20 months old and was diagnosed as being CINCA/NOMID based on characteristic findings of radiograph despite negative CIAS1 mutation. Radiological examination demonstrated metaphyseal fraying and cupping and widening of the growth plate in the distal femur. MR imaging showed mottled gadolinium enhancement at the chondrosseous junction. Neither significant joint effusion nor synovitis was identified. At 2 years and 7 months of age, anakinra, 2 mg/kg/day given by regular daily subcutaneous injections, was started. A few days after the initiation of the treatment, her clinical symptoms and laboratory findings of active inflammation were promptly alleviated. She was not able to walk unaided prior to the treatment, but she walked independently 1 month after the treatment. Follow-up radiographs and MR imaging showed that growth plate widening and gadolinium enhancement at the chondrosseous junction were less conspicuous. Furthermore, longitudinal growth of the femur and tibia was identified during 20 months of observation.
- Limb Length Discrepancy
- Autoinflammatory Disorder
- Chronic Meningitis
- Anakinra Treatment
CINCA/NOMID is an autoinflammatory disorder characterized by the triad of neonatal onset of cutaneous symptoms, chronic meningitis, and recurrent fever [1–4] Since many cases are attributed to heterozygous gain-of-function mutations in NLRP3 (CAIS1), the gene encoding cryopyrin [5, 6], it is classified into cryopyrin-associated periodic syndromes (CAPS). CAPS include three allelic variants, ranging in order of increasing severity from Familial Cold Auto-inflammatory Syndrome (FCAS), previously termed Familial Cold Urticaria, through Muckle-Wells Syndrome (MWS) to Chronic Infantile Neurologic Cutaneous Articular Syndrome or Neonatal-Onset Multisystem Inflammatory Disease (CINCA/NOMID) [7, 8]. However, CINCA/NOMID may be heterogeneous, and only 60% of affected individuals have NLRP3 mutations.
CINCA/NOMID presents with distinctive osteoarthropathy, mainly of the large joints and overgrowth of epimetaphyseal cartilage, particularly of the long bones. Histological examination for overgrown cartilage shows complete disorganization of the cartilage cell columns and irregular metachromasia of the cartilage substance, but no inflammatory cell infiltrates . The cartilage overgrowth eventually causes osseous overgrowth and deformity that persists beyond skeletal maturity and leads to limb length discrepancy, joint contracture, and early degenerative arthropathy [3, 9, 10] In particular, osteocartilaginous overgrowth in the patella and distal femur is so characteristic that its presence warrants a diagnosis of CINCA/NOMID.
Autoinflammation in CAPS has been proven to derive from excessive release of interleukin-1β (IL-1β) . Interestingly, deficiency of the IL-1 receptor antagonist due to mutations of IL1RN gives rise to the phenotype sharing some features with CINCA/NOMID but with some clinical peculiarities regarding skin and bone manifestations . It has been well documented that the IL-1 receptor antagonist anakinra (Kineret®) helps mitigate systemic inflammation in both disorders [12–14]. However, a general consensus has not been reached on its beneficial effect on osteoarthropathy. The case of a girl with CINCA/NOMID syndrome who showed dramatic improvement of overgrowth osteoarthropathy after anakinra treatment is reported.
Although no NARLP3 mutations were found in the present case, a diagnosis of CINCA/NOMID was warranted on clinical and radiological grounds. Her dermatological manifestation differed from that of deficiency of the IL-1 receptor antagonist (urticaria-like skin rash vs. pyoderma). Her clinical and radiological evolution following anakinra treatment implied that the therapy was effective not only in mitigating clinical symptoms of autoinflammation but also in preventing progression of osteoarthropathy. The beneficial effect of anakinra on arthropathy has been controversial. The case represented here indicated that the earlier anakinra was initiated, the better arthropathy was overcome. If the treatment had not been introduced, the osteoarthropathy eventually would have led to severe joint deformations, limb length discrepancy, and growth retardation, as previously reported. Once bone deformations develop in patients with CINCA/NOMID, they are very difficult to reverse . However, the tragic consequences can be prevented by early medical intervention in this case.
The imaging findings in the present girl included widening of the growth plate and gadolinium enhancement at the chondrosseous junction. These findings are in a broad sense termed ''metaphyseal dysplasia'', and are consistent with the known histological findings in CINCA/NOMID. According to a previous report, the histological findings for biopsy specimens from a ''bony mass'' were 1) disorganized cartilage at the growth plate and 2) thin metaphyseal trabeculae mixed with relatively acellular cartilage, fibrous tissues, and foci of calcification  The latter finding may correspond with gadolinium enhancement of the chondrosseous junction. In the present case, the anakinra treatment provided remodeling of the ''metaphyseal dysplasia'' with alleviation of gadolinium enhancement. This fact suggests that osteoarthropathy in CINCA/NOMID is caused by overproduction of IL-1β, as are the symptoms of autoinflammation and disappearance of them by specific receptor antagonist of IL-1β.
Osteoarthropathy is significant in approximately 60% of CINCA/NOMID patients, and it is more prevalent in cases with deficiency of the IL-1 receptor antagonist. The mechanism to explain why the excessive production of IL-1β causes distinctive osteocartilaginous overgrowth in CINCA/NOMID still remains unclear. Though it has been reported that IL-1β exerts inhibitory effects on murine ATDC5 chondrocyte dynamics and metatarsal longitudinal growth , recent observation suggested that overgrowth arthropathy in CINCA/NOMID is not driven by IL-1β, but such overgrowth may be due to abnormal apoptosis at the site of enchondral ossification as NALP3 is expressed in cartilage [16, 17].
This report indicated the importance of earlier indication of anakinra for better outcome of arthropathy in CINCA/NOMID syndrome. Once once bone deformations develop in the patients, they are very difficult to reverse even with anakinra.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor in Chief of this journal.
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