MIA is a potential biomarker for tumour load in neurofibromatosis type 1
- Mateusz Kolanczyk1, 2Email author,
- Victor Mautner3,
- Nadine Kossler1, 2,
- Rosa Nguyen3,
- Jirko Kühnisch2,
- Tomasz Zemojtel4,
- Aleksander Jamsheer5, 6,
- Eike Wegener1, 2,
- Boris Thurisch1, 2,
- Sigrid Tinschert7,
- Nikola Holtkamp8, 9,
- Su-Jin Park9,
- Patricia Birch10,
- David Kendler11,
- Anja Harder12,
- Stefan Mundlos1, 2, 9 and
- Lan Kluwe3, 13
© Kolanczyk et al; licensee BioMed Central Ltd. 2011
Received: 11 January 2011
Accepted: 4 July 2011
Published: 4 July 2011
Neurofibromatosis type 1 (NF1) is a frequent genetic disease characterized by multiple benign tumours with increased risk for malignancy. There is currently no biomarker for tumour load in NF1 patients.
In situ hybridization and quantitative real-time polymerase reaction were applied to investigate expression of cartilage-specific genes in mice bearing conditional inactivation of NF1 in the developing limbs. These mice do not develop tumours but recapitulate aspects of NF1 bone dysplasia, including deregulation of cartilage differentiation. It has been recently shown that NF1 tumours require for their growth the master regulator of cartilage differentiation SOX9. We thus hypothesized that some of the cartilage-specific genes deregulated in an Nf1Prx1 mouse model might prove to be relevant biomarkers of NF1 tumours. We tested this hypothesis by analyzing expression of the SOX9 target gene product melanoma-inhibitory activity/cd-rap (MIA) in tumour and serum samples of NF1 patients.
Increased expression of Mia was found in Nf1-deficient cartilage in mice. In humans, MIA was expressed in all NF1-related tumours and its serum levels were significantly higher in NF1 patients than in healthy controls. Among NF1 patients, MIA serum levels were significantly higher in those with plexiform neurofibromas and in those with large number of cutaneous (> 1,000) or subcutaneous (> 100) neurofibromas than in patients without such tumours. Most notably, MIA serum levels correlated significantly with internal tumour burden.
MIA is a potential serum biomarker of tumour load in NF1 patients which could be useful in following the disease course and monitoring the efficacy of therapies.
Neurofibromatosis type 1 (NF1) is a genetic disorder resulting from mutations in the NF1 tumour suppressor gene. Susceptibility to neoplastic transformation is the main feature of the disease . The most frequent tumours in NF1 are dermal neurofibromas, which can be found in more than 90% of adult patients . Approximately 50% of NF1 patients develop plexiform neurofibromas (pNFs), which can undergo malignant transformation into malignant peripheral nerve sheath tumours (MPNSTs) [3–6]. MPNSTs are highly malignant tumours with a poor prognosis. The lifetime risk of developing MPNSTs in the NF1 patient is 8% to 13% .
Major challenges in clinical practice are to determine tumour burden and to monitor the disease course. While cutaneous neurofibromas are visible on physical examination, the diagnosis of pNFs, especially internal ones, depends on magnetic resonance imaging (MRI), which is costly and laborious. Furthermore, early diagnosis is crucial for complete resection of MPNSTs, which is up to now the only curative treatment . A biomarker for assessment of tumour burden and detection of malignant transformation would therefore be of interest.
Previously, we and others have shown that loss of Nf1 gene function during murine embryogenesis causes defects of bone and cartilage development [9, 10]. One of the observed molecular changes in Nf1-deficient embryonic cartilage was an upregulation and persistently nuclear localization of the transcription factor SOX9. Interestingly, SOX9 was also recently found to be expressed in NF1-related tumours, where it supports cellular survival . As a master regulator of cartilage differentiation, SOX9 regulates expression of various downstream target genes, including collagen type 2a1, collagen type 11a2, aggrecan and melanoma-inhibitory activity (MIA). The last, MIA, is also known as cartilage-derived retinoic acid sensitive protein (cd-rap) and was originally isolated as a secretory factor from supernatants of melanoma cell cultures . MIA serum level was found to correlate with melanoma spreading  and was proposed as a biomarker for monitoring the course of disease and the efficacy of therapies . Various other tumours, predominantly those of neuroectodermal, glial origin, also express MIA . Recombinant MIA inhibits melanoma cell growth and cell attachment in vitro . Subsequent studies revealed that MIA interacts with extracellular matrix components, laminin and fibronectin, as well as with cellular matrix receptors integrin α5, integrin α4  and cadherin 7 .
In the present study, we examined expression of MIA in Nf1-deficient mouse cartilage, in human cutaneous and plexiform neurofibromas and MPNSTs, and in sera of NF1 patients with these tumours. MIA in the serum of healthy probands was examined as a control.
Mouse breeding and tissue processing
The mice were continuously back-crossed to wild-type C57BL/6J to minimize the variation of genetic background. The female Nf1flox mice were crossed to male Nf1flox heterozygous Prx1-Cre-positive males and the offspring genotyped as previously described . Embryos and postnatal tissue samples were fixed overnight at 4°C in 4% paraformaldehyde, dehydrated through an ethanol/xylol series, and embedded in paraffin blocks. Six-micrometer sections were cut and processed for haematoxylin and eosin/Alcian blue staining and in situ hybridization.
Patients and samples
The study was conducted with a cohort of 42 NF1 patients and 22 healthy individuals. The diagnosis of NF1 was made using National Institutes of Health criteria. The study protocol was approved by the local institutional review board, and all patients gave their informed consent. Cutaneous and subcutaneous tumours were counted or estimated in case the number was larger than 100. Plexiform neurofibromas, including internal ones, were detected by means of whole-body MRI in 30 of the 42 patients. Because of the limited resolution of whole-body MRI, lesions smaller than 3 cm in the longest diameter, which is often the case for spinal tumours, were not included. Tumour sizes were calculated using a semiautomated volumetric method, and the total internal tumour load was obtained subsequently, including PNs (Plexiform Neurofibromas), spinal tumours and internal nodule neurofibromas, but excluding cutaneous and subcutaneous tumours . An age effect for cutaneous, subcutaneous and internal tumours was examined using a nonparametric Spearman's rank-correlation test.
All serum samples were prepared using a standardized protocol in the laboratory of the Department of Maxillofacial Surgery at the University Medical Center Hamburg-Eppendorf. Whole blood of each patient was kept at room temperature for 30 minutes before being spun down at 4,500 rpm for 10 minutes using a benchtop centrifuge. The supernatant was stored at -80°C in 100-μL aliquots.
In situ hybridization was performed on paraffin sections according to standard protocol . Images were collected using a DMR HC microscope (Leica, Wetzlar, Germany) equipped with an AxioCam HRc camera (Zeiss, Jena, Germany) and evaluated using AxioVision 4.1 software (Zeiss, Jena, Germany).
Immunohistochemical detection of MIA
Sections of six cutaneous and three plexiform neurofibromas, as well as seven MPNSTs, from a total of sixteen NF1 patients were stained with monoclonal anti-human MIA antibody (R&D Systems, McKinley Place NE, Minneapolis) diluted at 1:40. Sections were boiled in citrate buffer (pH 6.1) for antigen retrieval. The streptavidin-biotin method was performed using an automated staining system TechMate (Dako, Hamburg, Germany) with an implemented counterstaining. Negative controls were carried out with normal serum without the primary antibody or with antibody preincubated in access (25 ng/μl) of recombinant human MIA (Peprotech GmbH, Hamburg, Germany). Stained sections were analyzed using the BX51 microscope (Olimpus, Hamburg, Germany) and analySIS 5.0 software (Soft imaging system GmbH, Münster, Germany).
Quantitative real-time polymerase chain reaction
RNA was isolated from the knee cartilage of two wild-type and two Nf1Prx1 mice using peqGOLD TriFast (PeqLab Biotechnologie GmbH, Erlangen, Germany) according to the supplied protocol. cDNA was synthesized from 1 μg of total RNA with MuLV Reverse Transcriptase (Applied Biosystems, Carlsbad, CA, USA). TaqMan Universal PCR Master Mix was then performed on an ABI PRISM 7900 Cycler (Applied Biosystems) using the SYBR Green method (Invitrogen, Darmstad, Germany) according to the manufacturer's instructions. The expression level of Mia was determined in Nf1Prx1 and wild-type tissues and was equilibrated against expression of glyceraldehyde 3-phosphate dehydrogenase (GAPDH). The following primers were used: mGAPDH: 5' GGGAAGCCCATCACCATCTT 3', 5' CGGCCTCACCCCATTTG 3'; mMIA: 5' GGAGGACCTGACTCTGAAACC 3'; 5' ACTGCAGGGATAGCGGTAG 3'.
The MIA ELISA kit was purchased from (Roche Diagnostics, Indianapolis, IN, USA) and the measurements were conducted in duplicate according to the supplied protocol. Internal negative and positive quality controls were provided in each enzyme-linked immunosorbent assay (ELISA) kit and were run in triplicate in each assay.
Mia expression is elevated in Nf1-deficient murine cartilage
MIAis expressed in NF1-associated tumours
Serum concentration of MIA in NF1 patients correlates with tumour load
MIA serum level was determined in the 42 NF1 patients and in 22 healthy individuals. The patients' ages ranged from 14 to 72 years (mean age, 36 years). The control group's ages ranged between 19 and 67 years (mean age, 40 years). An age effect was seen in the NF1 patients for the number of cutaneous tumours (P = 0.023), but not for subcutaneous tumours (P = 0.842) or internal tumours (P = 0.449). Additionally, linear regression analysis revealed an association between total internal tumour load and the number of subcutaneous tumours (P value 8.19E-17 for the F test), but not between internal tumour load and the number of cutaneous tumours.
In this study, we found increased Mia expression in Nf1-deficient cartilage of Nf1Prx1 mice where SOX9 expression and nuclear localization were previously shown . MIA promoter was previously shown to be regulated by SOX9 in a dose-dependent manner in cultured chondrocytes . It thus appears likely that MIA expression in NF1 tumours is also regulated by SOX9, as this transcription factor was reported to be required for the survival of MPNST cells . Our finding of MIA expression in various NF1-related tumours is consistent with the findings of previous reports that MIA is expressed in glial tumours .
The major finding of the present study is that MIA serum levels correlate with the internal tumour load in NF1 patients. Provided that this correlation can be confirmed in a larger cohort of NF1 patients, MIA would be a valuable biomarker for the internal tumour load.
In malignant melanoma cells, MIA was shown to bind integrin α5 and reduce ERK activity . MIA/cadherin-7 interactions were shown to regulate cell-cell adhesion of malignant melanoma cells, influencing their migration . It was also reported that MIA augmented transforming growth factor-β-mediated chondrogenic differentiation of human mesenchymal cells in vitro  and inhibited articular cartilage mineralization in vivo . It will be interesting to examine whether any of these effects of MIA play a role in NF1-related tumorigenesis and skeletal dysplasia. While more studies are needed to understand the contribution of MIA to NF1 pathology, the presented correlation of MIA serum level with the internal tumour load suggests that it is a promising candidate as a biomarker of the tumour load in NF1.
MIA is a potential biomarker of tumour load in NF1 patients and should be further evaluated for application in monitoring the clinical course and therapy outcomes of patients.
MK and NK were supported by the Young Investigator Award from the Children's Tumour Foundation (New York, NY), grant 2007-01-038, and by Bundesministerium für Bildung und Forschung (BMBF) grant NF1-01GM0844 (to MK, SM and VFM). This study was in part supported by the US Army NF 043115 (to VFM) and Rudolph-Bartling-Stiftung II/85 (to VFM and AK). LK was supported in part by BMBF grant 01GM0841. This work was also supported by the Sixth Framework of the European Commission, EuroGrow Project LSHM-CT-2007-037471, and by a grant from Berlin-Brandenburg Center for Regenerative Therapies ("Optimisation and application of a mouse cortical injury system for the survey of new bone anabolic therapies and delivery systems"; Platform A nr-30). We thank Monika Osswald and Carola Dietrich for excellent technical assistance. We want to acknowledge Ms. Jessica Knoblauc for her technical assistance, especially in preparing patient sera.
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