25(OH)D(3) affects the maturation and function of mouse bone marrow-derived dendritic cells stimulated by Mycobacterium bovis BCG

Effect of vitamin D3 on maturation and antigen-presenting function of dendritic cells treated with Mycobacterium tuberculosis

OBJECTIVE

To investigate the phenotypic characteristics and functional capability differences of mouse bone marrow-derived dendritic cells after stimulation with Mycobacterium tuberculosis in the presence or absence of vitamin D3.

METHODS

Mouse bone marrow-derived cells were cultured with GM-CSF (20 ng/mL). Then, one was added with 100 nmol/L of 25(OH)D3, while the other did not. On day 6, 5 μg/mL of BCG was added to stimulate the cells for 24 h. On day 7, suspension cells were harvested for phenotypic and functional analyses.

RESULTS

The percentages of CD86 dendritic cells (DCs) in the control group and 25(OH)D3 group were 66.97% ± 8.29% and 52.18% ± 8.52%, respectively; the mean fluorescence intensities of MHC-II in the control group and 25(OH)D3 group were 1 102.16 ± 371.02 and 681.62 ± 292.71. The expression levels of MHC- II and CD86 on the surface of the DCs in 25(OH)D3 group were significantly lower than those of the control group. The ability of the DCs to stimulate proliferation of T-lymphocytes was also significantly lower than that of the control group.

CONCLUSIONS

These findings suggest that 25(OH)D3 modulates the immune response by affecting the maturation and function of DCs in Mycobacterium tuberculosis period.

Levels of 1,25(OH)2D3 for patients with pulmonary tuberculosis and correlations of 1,25(OH)2D3 with the clinical features of TB

BACKGROUND

To determine the 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] concentrations to patients with tuberculosis (TB) and whether it influenced the patient's clinical features.

METHODS

For the first part, a total of 153 healthy adults and 74 patients with pulmonary TB (PTB) were enrolled. Serum concentrations of 1,25(OH)2D3 were determined by liquid chromatography-tandem mass spectroscopy to examine the 1,25(OH)2D3 concentrations of the two groups from the peripheral blood. If there are differences between the two groups, what follow will increase the experimental group numbers to examine the relationship among the 1,25(OH)2D3 concentrations with the numbers of the lesion area, the tubercule bacilli in sputum and the CD4/CD8 ratio of T lymphocytes in the peripheral blood.

RESULTS

In the first part, the 1,25(OH)2D3 concentrations was lower in patients with TB than in those healthy adults [365.9 (SD 235.7) vs. 464.3 (SD 335.6), P<0.05]. In the second part, we increased the sample size to 134 (male 91 cases, female 43 cases). we found that the plasma levels of 1,25(OH)2D3 are not correlated with the numbers of the lesion area and the tubercule bacilli in sputum, but the 1,25(OH)2D3 levels can interact the ratio of CD4/CD8 T lymphocytes, it shows a positive correlation with the ratio of CD4/CD8 T lymphocytes.

CONCLUSIONS

The 1,25(OH)2D3 concentrations in TB patients lower than the healthy adults, it might exist as a risk factor during the development of TB or TB might affect the levels of 1,25(OH)2D3. But the different status vitamin D concentration might not affect the numbers of the lesion area, the tubercule bacilli in sputum. It shows a positive correlation with the ratio of CD4/CD8 T lymphocytes. The study will have a significance value to clinical medicine, but further study will need to study the levels of 1,25(OH)2D3 with the TB.

Vitamin D receptor and CD86 expression in the skin of vitamin D-deficient swine

The immunomodulatory role of vitamin D in many diseases is well established. However, the relationship between vitamin D status and skin cancers is unclear. In this study, we examined the effect of vitamin D deficiency and sufficiency on VDR, NF-κB, and CD86 in the epidermis of Yucatan microswine tragi. All of these proteins have known roles in the pathogenesis of cutaneous malignancies such as melanoma and non-melanoma skin cancer. There was weaker and less discrete nuclear staining for VDR and weaker CD86 immunoreactivity with patchy membranous expression in the epidermis of vitamin D-deficient compared to vitamin D-sufficient swine. There was no difference in the immunostaining for NF-κB. Since VDR and CD86 expression are decreased in the setting of melanoma and non-melanoma skin cancers, our findings suggest a potential role of vitamin D-deficiency in the progression of skin malignancies.