ABSTRAKDiabetes melitus tipe 1 bersifat multifaktorial dan bergantung pada kombinasi kompleks dari elemen genetik, epigenetik, molekular dan selular yang menyebabkan kerusakan dari toleransi perifer sehingga menghasilkan kerusakan pada sel β pankreas. Beberapa penelitian menunjukkan kadar vitamin D yang rendah pada penderita DM tipe 1. Penelitian ini dilakukan secara cross sectional dangan subjek penelitian penderita DM tipe 1 usia 5-18 tahun, dan kontrol subjek sehat dengan usia yang sama. Kadar vitamin D plasma dan C-Peptida diukur dengan metode ELISA sedangkan jumlah sel Tregulator diukur dengan metode flowcytometry. Perbandingan antara kadar vitamin D, jumlah sel T regulator, dan kadar Cpeptida dianalisis dengan uji t tidak berpasangan. Hubungan antara vitamin D plasma, jumlah sel T regulator dan Cpeptida dianalisis dengan uji korelasi Pearson. Penelitian ini menggunakan 15 sampel dan 15 kontrol. Kadar 25(OH)D 3 secara signifikan lebih rendah pada penderita DM tipe 1 (22,07±5,53 vs 32,88±1,81ng/ml; p<0,05). Jumlah sel T regulator pada DM tipe 1 lebih rendah secara bermakna dibandingkan kontrol (6,86±1,20 vs 37,86±9,61; p<0,05), demikian juga kadar C-peptida (0,3±0,11 vs 3,40±1,10; p<0,05). Terdapat korelasi positif yang kuat dan signifikan antara vitamin D3 dengan jumlah sel T regulator dan kadar C-peptida, dan antara jumlah sel T regulator dengan kadar C-peptida pada penderita DM tipe 1. Dapat disimpulkan bahwa penderita DM tipe 1 mempunyai kadar vitamin D yang lebih rendah dibandingkan normal, dan kondisi ini berhubungan dengan jumlah sel Treg dan kadar C-peptida.Kata Kunci: Diabetes mellitus tipe 1, C-peptida, sel T regulator, vitamin D 3 ABSTRACT Diabetes mellitus type 1 is multifactorial and depends on a complex combination of genetic, epigenetic, molecular, and cellular elements that cause damage of peripheral tolerance and resulting damage to pancreatic β cells. Some researches show low level of vitamin D in patients with diabetes mellitus type 1. This cross sectional study was conducted on patients with DM type 1 aged from 5 to 18 years old and healthy subjects of the same age as control. Levels of vitamin D and Cpeptide were measured using ELISA, while the number of regulatory T cells was measured using flowcytometry method. Comparisons among levels of vitamin D, the number of regulatory T cells, and levels of C-peptide were analyzed with unpaired t test. The relationship among plasma vitamin D, the number of regulatory T cells and C-peptide were analyzed with Pearson correlation test. This study used 15 samples and 15 controls. Level of 25(OH)D was significantly lower in3 patients with DM type 1 (22:07 ± 5:53 vs 32,88 ± 1,81ng/ml; p<0,05). The number of regulatory T cells in type 1 diabetes was significantly lower than those in controls (6,86 ± 1,20 vs. 37,86 ± 9,61; p <0,05), as well as C-peptide levels (0,3 ± 0,11 vs 3,40±1,10; p <0,05
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