In December 2019, a new infectious complication called CoronaVirus Infectious Disease-19, briefly COVID-19, caused by SARS-COV-2, is identified in Wuhan, China. It spread all over the world and became a pandemic. In many individuals who had suffered SARS-COV-2 infection, cytokine storm starts through cytokine overproduction and leads to Acute Respiratory Syndrome (ARS), organ failure, and death. According to the obtained evidence, Vitamin D (VitD) enhances the ACE2/Ang(1-7)/MasR pathway activity, and it also reduces cytokine storms and the ARS risk. Therefore, VitD intake may be beneficial for patients with SARS-COV-2 infection exposed to cytokine storm but do not suffer hypotension. In the present review, we have explained the effects of VitD on the renin-angiotensin system (RAS) function and angiotensin-converting enzyme2 (ACE2) expression. Furthermore, we have reviewed the biochemical and immunological effects of VitD on immune function in the underlying diseases and its role in the COVID-19 pandemic.

IntroductionCeliac disease (CD) is a chronic inflammatory intestinal disorder. Different immunological factors, including inflammatory cytokines, may play an important role in disease susceptibility.AimTo investigate the relationship between -174G/C and -572G/C gene polymorphisms and the serum level of interleukin 6 (IL-6) and susceptibility to CD in the Iranian population.Material and methodsIn this case-control study blood samples were collected of 105 patients with CD and 106 healthy subjects randomly in 2016 and evaluated by polymerase chain reaction-restriction fragments length polymorphism (PCR-RFLP) method. A sequence was also used to confirm the results of both polymorphisms. The IL-6 concentration was measured using ELISA.ResultsThe results showed a significant relationship between polymorphism -572G in CD patients when compared with control subjects by genotype (p = 0.001) and alleles (p = 0.022), respectively. There was no significant relationship between polymorphism 174G and frequency of genotype, but an association of this polymorphism with the frequency of alleles (p = 0.034), age (p = 0.001), and body mass index (p = 0.003) was seen. The serum level of interleukin-6 was significantly associated only with rs1800796 (p < 0.001).ConclusionsThe results confirm previous studies in different parts of the world and indicate that IL-6 (572G/C) polymorphism may play a role in susceptibility to CD in the Iranian population.

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Background & Objective: The present study was conducted to determine testosterone and ferritin levels in women with polycystic ovary syndrome (PCOS) and investigate its relationship with body mass index (BMI) Materials & Methods: In this case-control study, 104 PCOS cases and 99 controls were included. The concentration of testosterone, ferritin, lipid profile, insulin, glucose, and androgen was measured in fasting blood samples. Results: Testosterone level was equal to 1.08 ± 0.50 and 0.85 ± 0.42 in the case and control groups, respectively (P< 0.001). Values of ferritin (123.45 ± 18.21ng/dl vs. 92.14 ± 17.74 ng/dl in control group, p< 0.001), insulin (11.41 ± 3.84 µU/ml vs. 7.02 ± 3.29 µU/ml in control group, p< 0.001), and insulin resistance (11.41 ± 3.84 vs.7.02 ± 3.29 in control group, p< 0.001) were also measured. There was a significant relationship between serum concentration of testosterone and ferritin with BMI) p<0.001). The role of ferritin to predict PCOS was significant (ß:-1.1, P< 0.001). Conclusion: According to the findings of the present study, the levels of testosterone and ferritin were increased in patients with PCOS. Although elevated testosterone levels are effective in PCOS, ferritin concentration is an important factor in predicting and exacerbating the disease.

The Coronavirus disease 2019 (COVID-19) virus spread from Wuhan, China, in 2019 and is spreading rapidly around the world. COVID-19 victims are almost associated with cardiovascular disease, high blood pressure, diabetes, and other underlying diseases. Concerning the high prevalence of these disorders, widespread mortality threatens global society, and its fatality rate may increase with increasing COVID-19 prevalence in countries with older populations. Therefore, evaluating patients' clinical status with severe COVID-19 infection and their medical history can help manage treatment. Currently, one of the considered treatments is angiotensin-converting enzyme 2 (ACE2) inhibition. This study investigated virus entry mechanisms through membrane receptors, their role in the pathogenesis of COVID-19 and underlying diseases, and treatment methods based on the viral entrance inhibition. According to existing studies, inhibition of ACE2 can increase oxidative stress, inflammation, fibrosis and ultimately exacerbate underlying diseases such as cardiovascular disease, kidney disease, diabetes, and hypertension in individuals with COVID-19. The ACE2 inhibition is not suitable for patients with COVID-19 with underlying diseases, but it seems that the recombinant ACE2 solution is more appropriate for inhibiting the virus in these patients if hypotension would be monitored.

Celiac disease is a chronic autoimmune disease that is associated with genetic, environmental and immunological factors. The disease is closely associated with genes that code for human leukocyte antigens DQ2 and DQ8 haplotypes. In general, celiac disease has been recognized as a T lymphocyte associated disorders in which proteins derived gliadins, in the form of naive or deamidated by tissue Transglutaminase, activate T lymphocytes and as a result, release proinflammatory cytokines Such as IFNγ, IL-17, IL-21 and etc. These cytokines lead to histopathological changes like villous atrophy and crypt hyperplasia In addition, celiac disease has a specific antibody against gluten and an autoantigen of the transglutaminase 2(TG2) that provides strong opportunities to fully understand the adaptive immune response leading to disease. In this review, we investigated the role of Th1 and Th17 as an important mediators in pathogenesis of celiac disease.

Background: There is an association between inflammatory factors and polycystic ovary syndrome (PCOS) and most of women with PCOS experience the symptoms of hirsutism. The purpose of this study was to evaluate the role of obesity in PCOS occurrence, which is linked with inflammation and hirsutism. Methods: This study was designed as a case-control research. It was performed on 102 women with PCOS and 102 healthy women as controls who were age-matched. Serum concentrations of testosterone, estradiol (E2), IL-1, IL-6, high-sensitivity c-reactive protein (hs-CRP), and aromatase activity were measured in blood samples. Statistical tests including unpaired t-tests, Mann-Whitney U test, Kruskal-Wallis, Spearman’s correlation, and Chi-square tests were used for data analysis. Statistical significance was set at p<0.05. Results: A significant difference was found between hs-CRP, IL-1, and IL-6 in PCOS patients and healthy individuals (p<0.001). Aromatase activity was markedly lower in PCOS cases. The serum level of IL-1 (p=0.392) and IL-6 (p=0.764) was not different between overweight and normal weight women. In both studied groups (case and control), hirsutism frequency was markedly higher in individuals with BMI ≥25 kg/m2 (p<0.05). Inflammatory factors significantly affected the PCOS group (p<0.05). However, logistic regression showed that hs-CRP increment is more effective on increasing the risk of PCOS (OR: 6.324, p<0.001). Conclusion: In this study, hs-CRP, IL-1, and IL-6 levels increased in all PCOS women. Although the incidence of hirsutism in PCOS is associated with obesity, in PCOS pathogenesis, only IL-1 and IL-6 were independent of BMI.

Background & Objective:  Polycystic ovary syndrome (PCOS) is a complex endocrine and metabolic disorder, which is characterized by ovulatory dysfunction and hyperandrogenism. This study was done to evaluate insulin and estradiol (E2) in women with PCOS and its relationship with Body mass index (BMI). Materials & Methods: This case-control study included, 104 women with polycystic ovary syndrome as a case group and 100 women without polycystic ovary syndrome as a control group. Concentrations of insulin, glucose and E2 were measured in fasting blood samples. Results: Insulin level was 7.02 ± 3.29 in control group, 11.41 ± 3.84 in the case group. FBS level was 82.75 ± 7.18 in control group versus 84.03 ± 5.82 in case group. E2 level was 70.74 ± 53.03 in control group and 60.21 ± 40.58 in case group. The insulin resistance level was 1.45 ± 0.74 in the control group versus 2.37 ± 0.83 in case group. According to correlation analysis, the insulin variable had a significant positive association with BMI (p < 0.0001, r=.245), although no significant correlation was seen between E2 and BMI (p-value = 0.245, r=.092) Conclusion: Present data showed that E2 levels were not different in PCOS and non-PCOS patients, but insulin levels in PCOS were significantly increased and PCOS women had significant insulin resistance which is dependent on BMI.