ABSTRACT
OBJECTIVE: To study a role of vitamin D and other indicators of calcium-phosphorus metabolism as possible predictors of Parkinson's disease (PD). MATERIAL AND METHODS: The main group consisted of 138 patients with PD, the control group included 79 patients without PD. Serum levels of 25-hydroxyvitamin D (25[OH]D) were determined by chemo-luminescence immunoassay. Additionally, the following biochemical markers were evaluated: parathyroid hormone, calcitonin, thyroid-stimulating hormone, thyroxine, alkaline phosphatase, inorganic phosphorus, total calcium, ionized calcium, total protein. In addition, densitometry of the spine (1-4 lumbar vertebrae), proximal femurs, and the middle third of the radius was performed. The relationship between the level of vitamin D in blood serum and clinical data was evaluated using correlation analysis. RESULTS: Regression analysis revealed a statistically significant contribution of the levels of parathyroid hormone, vitamin D, alkaline phosphatase and the T-value of the bone density of the neck of the right hip (T-score NRH) to the probability of PD. In the main group, bone mineral density was significantly different between the groups (p=0.028). Also, there was a high incidence of osteopenia (64%) and osteoporosis (73%). Based on the obtained regression equation, the probability of having PD is p=1/(1+exp2.673-0.007x-0.052y-0.037z-0.012k), where «x¼ is the parathyroid hormone level, «y¼ is T-score NRH, «z¼ is the vitamin D level, «k¼ is the activity of alkaline phosphatase, exp is the exponent. CONCLUSION: Vitamin D levels, alkaline phosphatase activity, and T-score NRH have a statistically significant effect on the likelihood of developing PD. With a decrease in the above indicators relative to normal values, the likelihood of having PD increases.
