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Article Open Access

Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome

  • Authors:
    • Fabio Timeus
    • Nicoletta Crescenzio
    • Giuseppina Baldassarre
    • Alessandra Doria
    • Stefano Vallero
    • Luiselda Foglia
    • Sara Pagliano
    • Cesare Rossi
    • Margherita Cirillo Silengo
    • Ugo Ramenghi
    • Franca Fagioli
    • Luca Cordero di Montezemolo
    • Giovanni Battista Ferrero
  • View Affiliations / Copyright

    Affiliations: Pediatric Hematology-Oncology, Regina Margherita Children's Hospital, 10126 Turin, Italy, Department of Pediatrics, University of Turin, 10126 Turin, Italy, Department of Genetics, University of Bologna, Policlinico S. Orsola-Malpighi, 40138 Bologna, Italy
    Copyright: © Timeus et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].
  • Pages: 553-559
    |
    Published online on: June 11, 2013
       https://doi.org/10.3892/or.2013.2535
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Abstract

Noonan syndrome (NS) is an autosomal dominant disorder, characterized by short stature, multiple dysmorphisms and congenital heart defects. A myeloproliferative disorder (NS/MPD), resembling juvenile myelomonocytic leukemia (JMML), is occasionally diagnosed in infants with NS. In the present study, we performed a functional evaluation of the circulating hematopoietic progenitors in a series of NS, NS/MPD and JMML patients. The different functional patterns were compared with the aim to identify a possible NS subgroup worthy of stringent hematological follow-up for an increased risk of MPD development. We studied 27 NS and 5 JMML patients fulfilling EWOG-MDS criteria. The more frequent molecular defects observed in NS were mutations in the PTPN11 and SOS genes. The absolute count of monocytes, circulating CD34+ hematopoietic progenitors, their apoptotic rate and the number of circulating CFU-GMs cultured in the presence of decreasing concentrations or in the absence of granulocyte-macrophage colony-stimulating factor (GM-CSF) were evaluated. All JMML patients showed monocytosis >1,000/µl. Ten out of the 27 NS patients showed monocytosis >1,000/µl, which included the 3 NS/MPD patients. In JMML patients, circulating CD34+ cells were significantly increased (median, 109.8/µl; range, 44-232) with a low rate of apoptosis (median, 2.1%; range, 0.4-12.1%), and circulating CFU-GMs were hyper-responsive to GM-CSF. NS/MPD patients showed the same flow cytometric pattern as the JMML patients (median, CD34+ cells/µl, 205.7; range, 58-1374; median apoptotic rate, 1.4%; range, 0.2-2.4%) and their circulating CFU-GMs were hyper-responsive to GM-CSF. These functional alterations appeared 10 months before the typical clinical manifestations in 1 NS/MPD patient. In NS, the CD34+ absolute cell count and circulating CFU-GMs showed a normal pattern (median CD34+ cells/µl, 4.9; range, 1.3-17.5), whereas the CD34+ cell apoptotic rate was significantly decreased in comparison with the controls (median, 8.6%; range, 0-27.7% vs. median, 17.6%; range, 2.8-49.6%), suggesting an increased CD34+ cell survival. The functional evaluation of circulating hematopoietic progenitors showed specific patterns in NS and NS/MPD. These tests are a reliable integrative tool that, together with clinical data and other hematological parameters, could help detect NS patients with a high risk for a myeloproliferative evolution.
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Copy and paste a formatted citation
Spandidos Publications style
Timeus F, Crescenzio N, Baldassarre G, Doria A, Vallero S, Foglia L, Pagliano S, Rossi C, Silengo MC, Ramenghi U, Ramenghi U, et al: Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome. Oncol Rep 30: 553-559, 2013.
APA
Timeus, F., Crescenzio, N., Baldassarre, G., Doria, A., Vallero, S., Foglia, L. ... Ferrero, G.B. (2013). Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome. Oncology Reports, 30, 553-559. https://doi.org/10.3892/or.2013.2535
MLA
Timeus, F., Crescenzio, N., Baldassarre, G., Doria, A., Vallero, S., Foglia, L., Pagliano, S., Rossi, C., Silengo, M. C., Ramenghi, U., Fagioli, F., Cordero di Montezemolo, L., Ferrero, G. B."Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome". Oncology Reports 30.2 (2013): 553-559.
Chicago
Timeus, F., Crescenzio, N., Baldassarre, G., Doria, A., Vallero, S., Foglia, L., Pagliano, S., Rossi, C., Silengo, M. C., Ramenghi, U., Fagioli, F., Cordero di Montezemolo, L., Ferrero, G. B."Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome". Oncology Reports 30, no. 2 (2013): 553-559. https://doi.org/10.3892/or.2013.2535
Copy and paste a formatted citation
x
Spandidos Publications style
Timeus F, Crescenzio N, Baldassarre G, Doria A, Vallero S, Foglia L, Pagliano S, Rossi C, Silengo MC, Ramenghi U, Ramenghi U, et al: Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome. Oncol Rep 30: 553-559, 2013.
APA
Timeus, F., Crescenzio, N., Baldassarre, G., Doria, A., Vallero, S., Foglia, L. ... Ferrero, G.B. (2013). Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome. Oncology Reports, 30, 553-559. https://doi.org/10.3892/or.2013.2535
MLA
Timeus, F., Crescenzio, N., Baldassarre, G., Doria, A., Vallero, S., Foglia, L., Pagliano, S., Rossi, C., Silengo, M. C., Ramenghi, U., Fagioli, F., Cordero di Montezemolo, L., Ferrero, G. B."Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome". Oncology Reports 30.2 (2013): 553-559.
Chicago
Timeus, F., Crescenzio, N., Baldassarre, G., Doria, A., Vallero, S., Foglia, L., Pagliano, S., Rossi, C., Silengo, M. C., Ramenghi, U., Fagioli, F., Cordero di Montezemolo, L., Ferrero, G. B."Functional evaluation of circulating hematopoietic progenitors in Noonan syndrome". Oncology Reports 30, no. 2 (2013): 553-559. https://doi.org/10.3892/or.2013.2535
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