Low levels of 25-hydroxyvitamin D3 and 1,25-dihydroxyvitamin D3 in patients with newly diagnosed type 1 diabetes

Paolo Pozzilli, Silvia Manfrini, Antonio Crinò, Antonio Picardi, Cesarea Leomanni, V. Cherubini, Luciana Valente, Manon Khazrai, Natalia Visalli, Elvira Fioriti, Giusy Coppolino, Chiara Guglielmi, Giuseppina Beretta Anguissola, Flavia Costanza, Anna Lisa Montemari, Gisella Cavallo, Riccardo Schiaffini, Angelo Lauria, Laura Cipolloni, Maria C. MatteoliPatrizia Patera, Stefania Corbi, Sabrina Spera, Concetta Suraci, Marco Cervoni, Giancarlo De Mattia, Maria R. Cassone Faldetta, Maria L. Manca Bitti, Carla Bizzarri, Marco Cappa, Dario Pitocco, Giovanni Ghirlanda

Research output: Contribution to journalArticlepeer-review


Background and aims: An epidemiological retrospective study and a recent prospective study from Finland have both concluded that vitamin D3 supplementation at birth protects individuals from type 1 diabetes later in life. Moreover, it is thought that vitamin D3 supplementation, in particular its activated form, 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3], may act as an immunomodulator, facilitating the shift from a Th1 to a Th2 immune response. The aim of this surveillance study was to measure levels of both 25-hydroxyvitamin D3 (25OHD3) and 1,25- dihydroxyvitamin D3 in patients with newly diagnosed type 1 diabetes as compared to normal subjects. Methods: We measured plasma levels of 25-hydroxyvitamin D3 [25OHD3] and 1,25-dihydroxyvitamin D3 by radioimmunoassay in 88 consecutive patients with newly diagnosed type 1 diabetes (mean age 14.6 years; diagnosis within the last week), and in 57 healthy age and sex-matched subjects (mean age 16.5 years) born and residing in the Lazio region of continental Italy. Results: Mean levels of both 25OHD3 and 1,25-(OH)2D3 were significantly lower in patients compared to controls (p <0.01 and p <0.03, respectively). There was no correlation between 1,25-(OH) 2D3 plasma level and metabolic control status at disease diagnosis, age, gender, or most importantly, seasonality of disease diagnosis. This new observation endorses the findings of the Finnish study, even though Italy is a geographic area with more hours of sunlight than Finland. Conclusions: These findings suggest that vitamin D3 may be an important pathogenic factor in type 1 diabetes independent of geographical latitude, and that its supplementation should be considered not only at birth, but also at diagnosis of type 1 diabetes with the aim of favouring a Th2 immune response and protecting residual beta cells from further destruction.

Original languageEnglish
Pages (from-to)680-683
Number of pages4
JournalHormone and Metabolic Research
Issue number11
Publication statusPublished - Nov 2005


  • Immune response
  • Type 1 diabetes
  • Vitamin D

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology


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