cholecalciferol and Staphylococcal-Infections

Turkey osteomyelitis complex (TOC) is defined by the US Food Safety Inspection Service (FSIS) to include normal-appearing processed turkey carcasses that contain lesions including green discoloration of the liver, arthritis/synovitis, soft-tissue abscesses, and osteomyelitis of the proximal tibia. The lesions are associated with many different opportunistic organisms, mainly Staphylococcus aureus and Escherichia coli, suggesting that TOC incidence may be influenced more by deficiencies in the host immune response rather than by the virulence of any one organism. This syndrome is primarily a disease of adolescent male turkeys, and birds with TOC lesions have decreased indices of cell-mediated immunity, leading to the hypothesis that defects in the immune response of individuals within flocks of male turkeys may be responsible for the occurrence of these opportunistic infections. We have developed an experimental model for this disease in which treatment with dexamethasone (DEX), either with or without air sac inoculation with Escherichia coli, produces all of the lesions associated with TOC. These studies suggest that TOC is a result of stress-induced immunosuppression in a subpopulation of male turkeys that respond to the stressors in modern poultry production in a detrimental manner. Supplemental vitamin D3 treatment protected male turkeys from the immunosuppression induced by multiple treatments with DEX and resulted in decreased incidence of mortality, TOC, green liver, and isolation of bacteria from tissues, lower air sacculitis scores, and lower heterophil to lymphocyte ratios than nonsupplemented controls. Vitamin D3 also protected BW; relative weights of the liver, heart, spleen, and bursa; and clinical chemistry values from the effects of DEX treatment. The ability of vitamin D3 supplementation to protect turkeys from the immunosuppressive effects of severe stress emphasizes its role as a prohormone that affects health and disease resistance in turkeys and suggests that variation in the vitamin D receptor genotype may be involved in this disease process. This model has potential value in the identification of other nutritional and physiological immunomodulators that can decrease TOC incidence and will provide a means for the divergent selection of birds more resistant to the stressors of turkey production. In addition, this model will provide justification for management options designed to minimize stress.

Topics: Animals; Cholecalciferol; Dexamethasone; Escherichia coli Infections; Female; Glucocorticoids; Immunosuppression Therapy; Male; Osteomyelitis; Poultry Diseases; Staphylococcal Infections; Turkeys

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) caused a global pandemic of severe coronavirus disease 2019 (COVID-19).. The RA dataset (GSE93272) and the. A total of 199 DEGs were extracted from the GSE93272 and GSE33341 datasets. KEGG analysis of enrichment pathways were NLR signaling pathway, cell membrane DNA sensing pathway, oxidative phosphorylation, and viral infection. Positive/negative regulation of the immune system, regulation of the interferon-I (IFN-I; IFN-α/β) pathway, and associated pathways of the immunological response to viruses were enriched in GO and ClueGO analyses. PPI network and Cytoscape platform identified the top 10 hub genes: RSAD2, IFIT3, GBP1, RTP4, IFI44, OAS1, IFI44L, ISG15, HERC5, and IFIT5. The pathways are mainly enriched in response to viral and bacterial infection, IFN signaling, and 1,25-dihydroxy vitamin D3. IFI44, OAS1, IFI44L, ISG15, and HERC5 are the five hub genes shared by RA, COVID-19, and SAB. The pathways are primarily enriched for response to viral and bacterial infections. The TF-hub gene network and miRNA-hub gene network identified YY1 as a key TF and hsa-mir-1-3p and hsa-mir-146a-5p as two important miRNAs related to IFI44. IFI44 was identified as a hub gene by validating GSE17755, GSE55235, and GSE13670. Immune cell infiltration analysis showed a strong positive correlation between activated dendritic cells and IFI44 expression.. IFI144 was discovered as a shared biomarker and disease target for RA, COVID-19, and SAB by this study. IFI44 negatively regulates the IFN signaling pathway to promote viral replication and bacterial proliferation and is an important molecular target for SARS-CoV-2 and

Topics: Antigens; Arthritis, Rheumatoid; Biomarkers; Cholecalciferol; COVID-19; Cytoskeletal Proteins; Humans; Immune Evasion; Interferons; MicroRNAs; SARS-CoV-2; Staphylococcal Infections; Staphylococcus aureus

In humans and other primates, 1,25(OH)

Topics: Animals; Antimicrobial Cationic Peptides; Cathelicidins; Cholecalciferol; Female; Gene Expression Profiling; Gene Expression Regulation; Humans; Immunity, Innate; Lipopolysaccharides; Macrophages; Male; Mice; Mice, Inbred C57BL; Mice, Inbred DBA; Mice, Transgenic; Phagocytes; Phagocytosis; Salmonella typhimurium; Signal Transduction; Skin; Staphylococcal Infections; Staphylococcus aureus; Transgenes; Vitamin D; Vitamin D Response Element

Staphylococcus aureus is a major pathogen of subclinical bovine mastitis that usually is chronic and recurrent, which has been related to its ability to internalize into bovine mammary epithelial cells (bMECs). Previously, we reported that short and medium fatty acids and cholecalciferol reduce S. aureus internalization into pretreated-bMECs with these molecules suggesting a role as immunomodulatory agents. Hence, we assessed the role of sodium butyrate (NaB), sodium octanoate (NaO) and cholecalciferol on S. aureus adhesin expression and its internalization into bMECs. S. aureus pre-treated 2 h with 0.5 mM or 2 mM NaB showed a reduction in internalization into bMECs (∼35% and ∼55%; respectively), which coincided with a down-regulated expression of clumping factor B (ClfB). Also, the S. aureus internalization reduction by 2 mM NaB (2 h) agreed with a down-regulated expression of sdrC. Moreover, the 2 mM NaB (24 h) pre-treatment induced bacterial internalization (∼3-fold), which was related with an up-regulation of spa, clfB and sdrC genes. Also, NaO (0.25 mM and 1 mM) only reduced S. aureus internalization when bacteria were grown 2 h with this molecule but there was no relationship with adhesin expression. In addition, cholecalciferol (50 nM) reduced bacteria internalization at similar levels (∼50%) when bacteria were grown 2 and 24 h in broth supplemented with this compound, which correlated with spa and sdrC mRNA expression down-regulated at 2 h, and fnba and clfB mRNA expression decreased at 24 h. In conclusion, our data support the fact that fatty acids and cholecalciferol regulate adhesin gene expression as well as bacteria internalization in nonprofessional phagocytic cells, which may lead to development of anti-virulence agents for control of pathogens.

Topics: Adhesins, Bacterial; Animals; Bacterial Proteins; Butyric Acid; Caprylates; Cattle; Cell Line; Cholecalciferol; Down-Regulation; Epithelial Cells; Fatty Acids; Female; Gene Expression Regulation, Bacterial; Gentamicins; Immunity, Innate; Immunologic Factors; Immunomodulation; Mammary Glands, Animal; Mastitis, Bovine; RNA, Messenger; Staphylococcal Infections; Staphylococcus aureus; Virulence Factors

Bone and soft tissue infections are difficult problems in orthopedic surgery. Infections resulting in chronic osteomyelitis if established are difficult to eradicate. The delivery of local antibiotics for the treatment of open infected wounds of the musculo skeletal system is a more logical approach to treat these infections. Antibiotics given systemically are unable to achieve minimum inhibitory concentration in areas of infected wounds which are ischemic or relatively avascular. And also these antibiotics given over a prolonged period lead to significant toxicity and side effects and emergence of resistant bacteria. The author has been treating difficult cases of infected wounds sustained in road accidents, wounds (diabetic ulcers) in Diabetes Mellitus with necrotizing fasciitis and post operative infections with discharging sinuses with infected implants inside by his own innovative method of antibiotic delivery. The infected open wounds have been treated by application of Vitamin D3 granules impregnated with Tobramycin or Tobramycin and Vancomycin combined. All the patients responded successfully to this novel method of treatment which is extremely simple, effective, low cost, without any complications or side effects and has shown excellent results. Not only the Vitamin D

Topics: Administration, Topical; Adult; Anti-Bacterial Agents; Cholecalciferol; Cohort Studies; Drug Carriers; Female; Fractures, Open; Humans; Male; Middle Aged; Osteomyelitis; Prognosis; Retrospective Studies; Risk Assessment; Severity of Illness Index; Soft Tissue Infections; Staphylococcal Infections; Tobramycin; Vancomycin; Wound Healing; Wound Infection

Vitamin D has been found have various biological effects that may be potent in preventing bovine mastitis. Two forms of vitamin D, vitamin D

Topics: Animals; Cattle; Cell Survival; Cholecalciferol; Epithelial Cells; Ergocalciferols; Female; Mastitis, Bovine; Staphylococcal Infections; Staphylococcus aureus; Vitamin D; Vitamins

Vitamin D has immunomodulatory functions regulating the expression of host defense genes. The aim of this study was to determine the effect of cholecalciferol (vitamin D3) on S. aureus internalization into bovine mammary epithelial cells (bMEC) and antimicrobial peptide (AP) mRNA expression. Cholecalciferol (1-200 nM) did not affect S. aureus growth and bMEC viability; but it reduced bacterial internalization into bMEC (15-74%). Also, bMEC showed a basal expression of all AP genes evaluated, which were induced by S. aureus. Cholecalciferol alone or together with bacteria diminished tracheal antimicrobial peptide (TAP) and bovine neutrophil β-defensin (BNBD) 5 mRNA expression; while alone induced the expression of lingual antimicrobial peptide (LAP), bovine β-defensin 1 (DEFB1) and bovine psoriasin (S100A7), which was inhibited in the presence of S. aureus. This compound (50 nM) increased BNBD10 mRNA expression coinciding with the greatest reduction in S. aureus internalization. Genes of vitamin D pathway (25-hydroxylase and 1 α-hydroxylase) show basal expression, which was induced by cholecalciferol or bacteria. S. aureus induced vitamin D receptor (VDR) mRNA expression, but not in the presence of cholecalciferol. In conclusion, cholecalciferol can reduce S. aureus internalization and differentially regulates AP expression in bMEC. Thus, vitamin D could be an effective innate immunity modulator in mammary gland, which leads to a better defense against bacterial infection.

Topics: Animals; Anti-Infective Agents; beta-Defensins; Cattle; Cells, Cultured; Cholecalciferol; Epithelial Cells; Female; Mammary Glands, Animal; Mastitis, Bovine; Staphylococcal Infections; Staphylococcus aureus