Vitamin D, a fat-soluble vitamin, has many biological consequences. It increases absorption of calcium, phosphate and magnesium in gut. Vitamin D3 and D2 (Cholecalciferol, Ergocalciferol) are essential compounds in our body  . Parkinson’s Disease is widespread neurological ailment of old age with unidentified cause. PD has great financial burden and social status of people universally. Uneven prevalence and incidence rates may be affected by ecological or hereditary components, approaches for case determination, diagnostic criterion, or age disseminations of investigation populaces may affect outcomes. Equivalence of existing researches is restricted  . Vitamin D3 assumes a critical part in pathogenesis of skeletal ailments and calcium homeostasis  . Vitamin D insufficiency likewise predicts expanded danger of other perpetual ailments, malignancy,  , cardiovascular sicknesses  and DM (type 2)  . Constantly deficient vitamin D values promote a constant loss of dopaminergic neurons and propose to assume a major part in the pathogenesis of PD  . The epidemiological confirmation of a relationship among vitamin D and PD is, however, constrained to cross-sectional researches    .
Studies had declared that in America (North), hundreds of populations who suffer from PD are vitamin D deficient. There is connection among PD and D3. These results have a strong correlation in old age peoples and fall risks and intimates additional search into the method essential for this connection  . Subjects with PD have decreased vitamin D concentrations in relation to controls. PD is a noteworthy reason for incapacity in older people. Biological credibility and epidemiological information show that vitamin D inadequacy may add to PD progression  . The recent research explored whether D3 level predicts Parkinson disease occurrence in populace of Pakistan where solar exposure is high from different zones of world. Vitamin D inadequacy had turned into universal issue in the older, kids and grown-ups   . Lack of vitamin D3 can occur from decreased solar contact  . Altered bone mineralization and bony injury are associated with insufficiency leading to softening bony ailments (osteomalacia and rickets)   . This study will help in future to manage PD patients properly by reducing risk, treating and avoiding complications by giving additional supplements of vitamin D as a primary step by adding the basic element to diet and as drug.
2.1. Subjects and Setting
A sum of 243 diagnosed PD subjects from local community enrolled during 2014 to 2016 attending Department of Medicine, People’s Medical University Hospital Nawabshah, Sindh, Pakistan. Sample size calculated by OpenEpi version 3, with population size 1.6 million, hypothesized percent frequency of outcome factor in PD 66/100,000, with confidence level 90% and margin of error 10%. Subjects with other neurodegenerative, thyroid ailments, and new change in lifestyle or nutritional status excluded. A questionnaire based interview and complete clinical examination performed in subjects. All aspects of research updated to subjects and signed consent obtained. Educational situation, routine daylight contact, cigarettes, alcohol, head injury, pesticide exposure and medical history taken by direct questions. This study conducted after authorization of Peoples Medical University Hospital ethical committee.
2.2. Diagnoses of PD and Vitamin D3 Deficiency
Parkinson’s disease was diagnosed through UK PD Society Brain Bank clinical diagnostic criteria,  clinical history and relevant signs on examination of patients. Vitamin D3 deficiency diagnosed through laboratory analysis of blood samples of PD sufferers. Serum 25(OH)D concentrations > 30 ng/ml normal, >20 and <30 ng/ml insufficiency and deficiency < 20 ng/ml  .
A well-versed printed consent dully signed by subjects with diagnosis of PD obtained and gratifying inclusion criterion attending Medical Departments PMC Hospital Nawabshah. The venous blood drawn, sent to laboratory for analysis of serum Vitamin D3 by Mini Vidas Biomerieux Global Company France. Levels < 30 ng/ml were labeled as Hypovitaminosis D. After collection of investigations, serum Vitamin D3 levels in PD subjects were determined and proforma filled accordingly.
2.3. Statistical Analysis
The important outcome of study was assessment of vitamin D levels in subjects of PD. All gathered figures analyzed by Statistical Package for Social Science (SPSS) software, edition 20.0. Frequency & percentages computed for categorical variables like gender, and Vitamin D levels. Mean and standard deviation considered for variables (quantitative) as age and vitamin D3 levels. Significance of serum Vitamin D was seen with age, gender, duration of PD to see the impact of these on outcomes. P value < 0.05 was considered statistically significant. Variables (Clinical) communicated as mean ± standard deviation (SD) or percentage as suitable. Chi-square test utilized to review distinctions in ratios. Affiliation among serum vitamin D3, PD and its duration were investigated by bivarate correlation analysis by changing for the covariates (age, sex, BMI, smoking, liquor utilize, pesticide history, BMI and vitamin D). The relationships between serum 25(OH)D and length of PD were examined by bivarate correlation investigation.
3.1. Analyses of Age and Vitamin D
In recent study there were a total of 243 subjects with PD who were assessed for frequency of vitamin D deficiency. The Mean age of patients was 67.64 with SD ± 6.67 years minimum 56 and maximum 85 years respectively. Mean values of vitamin D3 levels were 27.68 with SD ± 21.72 ng/ml with minimum 08 ng/ml and maximum values 85.50 ng/ml.
3.2. Analyses of Demographic Data
Most participants were males 170 (70%) and 73 (30%) females, 232 (95.5%) married and 11 (4.5%) were unmarried (p = 0.000). A large number of subjects 162 (66.7%) were from rural and 81(33.3%) from urban community (p = 0.000). By occupation 27 (11.1%) have no any occupation, 73 (30%) house-wives, 100 (41.2%) manual workers and 43 (17.7%) were office workers (p = 0.000). Regarding educational status 64 (26.3%) uneducated, 123 (50.6%) primary to matriculation, 48 (19.8%) intermediate to graduation and only 08 (3.3%) were postgraduates (p = 0.000). A large number of study subjects 213 (87.7%) had no any evidence of PD in family, where as positive family history was observed in 30 (12.3%) subjects (p = 0.000). Evaluating risk factors for PD, history of pesticide contact in 09 (3.7%), smoking 61 (25.1%), alcohol abuse 24 (9.9%) and history of head injury observed in 18 (7.4%) subjects (p = 0.000). BMI normal in 143 (58.8%), over weight in 91 (37.4%) and 09 (3.7%) were obese subjects (p = 0.000). Baseline characteristics of participants as tremors, bradykinesia, speech changes, impaired posture and balance, rigidity and writing changes were observed in 67.1%, 10.7%, 6.2%, 5.8%, 5.3% and 4.9% respectively (p = 0.000). Regarding duration of PD 82 (33.7%) were <01 year, 40 (16.5%) 1 - 2 years, 41 (16.9%) 2 - 5 years, 40 (16.5%) 5 - 10 years and 40 (16.5%) had duration > 10 years (p = 0.000). We identified 151 (62.1%) subjects with vitamin 25(OH)D < 30 ng/ml, remaining 92 (37.9%) have normal vitamin D3 values (30 - 150 ng/ml) (p = 0.000). Insufficiency (10 - 30 ng/ml) found in 148 (60.9%) and deficiency (<10 ng/ml) was seen in 03 (1.2%) subjects (p = 0.000). Rest of chi-square values and df were shown in Table 1.
3.3. Analyses of Different Correlations
The correlation of different variables assessed as shown in Table 2. We found that vitamin D3 levels (p = 0.000) were strongly correlated with age (p = 0.000), duration of PD (p = 0.000) these were statistically significant, and the analysis of other risk factors of PD were also assessed there was not significant correlation of various risk factors of PD and vitamin D deficiency like head injury (p = 0.017) alcohol (p = 0.358), smoking (p = 0.566), pesticide contact (p = 0.512), family history (p = 0.840) and BMI (p = 0.572) as shown in Table 2. The p-value of less than 0.05 was considered statistically significant.
Pakistan is underdeveloped country with poor control on population growth and lack of resources. There is lot of hindrances in the health management parameters. Here we had carried out a research on PD and vitamin D3 level. PD is disease of old age. Sun exposure is easily available and prevalent throughout the country except few areas. There is poor concept of sunbath. Our male population remains outdoors most of daytime for earning purpose. Burka/Parda is common hindrances of females for sun exposure. Head injury, pesticide exposure,
Table 1. Frequency, percentage and chi-square values of study variables.
Table 2. Correlation of different variables in Parkinson’s disease subjects. Correlations of low levels of Vitamin D levels with other variables of study.
*Significant Correlation at 0.05 levels (2-tailed). **Significant Correlation at 0.01 levels (2-tailed).
smoking are common in comparison to alcoholism and obesity in PD. Due to lack of health education, most of time peoples ignore health issues. Currentlyan established role of vitamin D and PD was identified. We carried out a study in our population to check the presence of low levels of vitamin D3 in PD. There is described role of vitamin D3 lack in PD, vitamin D3 insufficiency leads or progresses to Parkinson’s disease. These issues were focused in different studies in rest of world. Findings of present study are match-able with previous studies as discussed below.
PD (Parkinson’s disease) is a neurodegenerative disease in a particular zone of the cerebrum called substantia nigra,  characterized by inflexible nature, tremors and dyskinesia along with postural insecurity and dementia. Vitamin D had critical effect on neurological illnesses as PD and Dementia. In cerebrum, hippocampus and substantia nigra neurons show high convergences of VDRs in their core and 1-OHase in their cytosol. In present study mean ± SD values of age were 67.64 ± 6.67 years (age range 56 - 85 years), males 170 (70%) and 73 (30%) were females, our findings are supported in a study by Moghaddasi M et al. in which mean age of the patients were 56.57 ± 11.71 years (age range 24 - 79 years); 3 (75.9%) males and 20 (24.1%) were females. Mean age of symptoms onset was 50.71 ± 12.10 years (range 20 - 77 years)  . With insufficiency of vitamin D, there is hazard of developing PD; this hazard increases to twofold when there is deficiency of vitamin D  . Vitamin D levels were low in subjects with PD and AD in comparison to the normal controls,  current study also determined insufficiency of vitamin D3 in 61.1% of PD subjects. 25(OH)D3 emphatically connected with intellectual execution, especially with measuring its role in elderly populace  . Many of studies (Cross Sectional) had shown the relationship of decreased levels of vitamin D with incident of PD also predicted increased hazard of PD  . Vitamin D levels in high-risk group and matched controls (age, sex) did not differ, and it was suggested that there is no deficiency of vitamin D before diagnosis of PD  . A majority of researches in established PD had shown lower vitamin D values as compared to fit controls  . Serum values of vitamin D decrease as severity of disease increases   as low levels of vitamin D3 were observed in subjects of PD in this study.
Nitric Oxide (free radical) can damage to cells, its synthesis is inhibited by vitamin D, and vitamin D3 also causes formation of glutathione (antioxidant) thus plays a neuro-protective role  . It is assumed that vitamin D3 is involved in initiating the synthesis of N G F (nerve growth factor), Glial cell line derived factor and NT3 (Neurotrophin) and in this way is considered as Neurotrophic Factor    . Peterson et al. in their research found strong relationship of automatic postural responses with serum vitamin D concentrations  . Daily vitamin D3 supplements (1200 IU) for one year showed mild progression of disease and worsening of disease observed in those who did not receive increments.  As there were presence of more than one symptom of PD, VDD was more common as age of patient increases with more than one symptom. Patients with PD had limited outdoor activities so solar exposure is decreased this may contributes to decreasing levels of vitamin D even with incremental intake  .
Juan Wang et al. showed statistically a significant link among vitamin D values and sun exposure; and no involvement among serum vitamin D and daily oral supplements of vitamin D. There study indicated that low values of this vitamin with reduced sun exposure are associated with increase hazard of PD  , above associations of VDD and PD are evident in present study. Yoon JH et al. in their study subjects with early PD, observed the relation among serum vitamin D values and endothelial cell dysfunction  . Probable racial variations in passageway for consumed vitamin D may be dilemma crossways to panel suggestions meant for D3 values as in Inuit. Decreased synthesis of this vitamin is balanced in Inuit through transforming lot of vitamin-D towards its chiefly active type  . A Toronto research on Canadians (young) from various origins had average vitamin D3 values that were fundamentally elevated from authorized proposals  . 22% European, 78% and 77% of Asian (East, South) heritage had vitamin D3 level < 40 nmol/l (15 ng/ml), compared with previous studies. Toronto study in Asians (East) observed decreased vitamin D3 in contrast with White community  .
Rural men around Delhi had average 44 nmol/L of D3, in current study 162 (66.7%) subjects from rural and 81 (33.3%) were urban (p = 0.000), with mean vitamin D3 levels 27.68 ± 21.72 ng/ml, these findings are matching with results of study by Rajasree S et al. Normal Indians have decreased vitamin D3, not much unusual than Canadian Asians (South). South Indians with IHD had tremendously increased (>222.5 nmol/l) D3 values  . In present study with references to above studies we found that 151 (62.1%) subjects have vitamin D3 <30 ng/ml and remaining 92 (37.9%) have sufficient D3 values (30 - 150 ng/ml) (p value 0.000). Insufficiency (10 - 30 ng/ml) in 148 (60.9%) and deficiency (<10 ng/ml) observed in 03 (1.2%) subjects (p = 0.000). Melanin substance demonstrated opposite association with serum 25(OH)D  . Uniformly deficient 25(OH)D values seen in Indians (living in India and China). Noteworthy Hereditary minority of French Canadians didn’t buildup consumed vitamin D3. Vitamin D3 protein binding polymorphisms had a significant part of variety in serum D3 as totaled intake of vitamin D3   . Different methods controlling metabolism with limited extent of vitamin D values in which vascular capacity is streamlined were associated with increased mortality  , abnormal functioning and premature aging  .
Worldwide prevalence of vitamin D deficiency/insufficiency accounts for 1 billion people  where south Asians are uniformly affected despite abundant sunshine  . Pakistan a rising nation of Asia (South) with an area spreading over scope 24˚35' North and longitude 61˚ East to 78˚ East, seriously facing D3 insufficiency in pregnant ladies, neonates, babies, youngsters, teenagers, grown-ups, and elderly individuals regardless of plentiful daylight  . 70% fit volunteers in Pakistan, 84% pregnant ladies in India are distressed by VDD. Sri Lanka and Bangladesh are no exception where 26% boys and 8% girls are victims of VDD  . A study demonstrated 66.32% of PD and 22.62% of healthy individuals had mild to moderate VDD (cutoff value < 30 ng/ml). Pakistani population in general had VDD and vitamin D supplementation assumed to be added after clinical evaluation of population groups  . Mansoor et al. elucidated that 56.9% men and 43.1% normal women had Vitamin D3 < 20 ng/ml  . Sheikh et al. observed in 84.3% of tested healthy subjects (38 - 55 years) in Karachi had 25(OH)D levels < 30 ng/ml suggesting extensive VDD prevalence throughout Pakistan declaring Pakistani population a vitamin D deficient  .
Findings of above studies were considerably in contest with present study where we identified 151 (62.1%) subjects have vitamin D3 < 30 ng/ml. A narrowed danger of death in old age observed with high Vitamin D3 levels while others didn’t benefit  . Taking supplements are valuable or not still unclear  . Increased danger of vitamin D deficiency observed in Blacks comparison to White populace  . Further studies needed to find out reasons for these differences and clarify probable part of vitamin D in pathogenesis and clinical path of PD.
Vitamin D deficiency is commonly associated in patients suffering from Parkinson’s disease. As concluded in present research that as the age advances, risk of Parkinson’s disease increases with simultaneous decrease in vitamin D level. As concluded in our study, 62.1% subjects of Parkinson’s disease were vitamin D deficient.