LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 81

Search options

  1. Article ; Online: Antibody production in mice requires neither vitamin D, nor the vitamin D receptor.

    Plum, Lori A / Blaser, William / Peter, Logan / Prahl, Jean / Seeman, Jeremy / DeLuca, Hector F

    Frontiers in immunology

    2022  Volume 13, Page(s) 960405

    Abstract: The vitamin D receptor as well as its ligand have been localized to various immune tissues and cells. These observations have led researchers to hypothesize a role for vitamin D in the immune system. However, a specific role for vitamin D in immunity has ...

    Abstract The vitamin D receptor as well as its ligand have been localized to various immune tissues and cells. These observations have led researchers to hypothesize a role for vitamin D in the immune system. However, a specific role for vitamin D in immunity has yet to be clearly delineated. The work in this report was undertaken to determine if mounting an antibody response is altered in the face of vitamin D-deficiency or when the signaling pathway is eliminated by removal of the nuclear receptor. This investigation provides direct evidence vitamin D is not necessary for producing antibodies, a process paramount for optimal attack against many foreign organisms. The idea that vitamin D plays a significant role in immunity has been proposed repeatedly for many years. To address this important idea we have carried out studies in mice to determine if vitamin D plays a significant role in antibody production. Two animal models were utilized: mice depleted of vitamin D and mice devoid of the vitamin D receptor. Further, a possible role of hypocalcemia resulting from vitamin D deficiency in antibody production was determined. Neither the absence of vitamin D or the vitamin D receptor nor hypocalcemia affected the ability of mice to mount an antibody response to an antigen challenge. Thus, we found no evidence that vitamin D or normal serum calcium is required for this major form of immunity.
    MeSH term(s) Mice ; Animals ; Vitamin D ; Receptors, Calcitriol/metabolism ; Antibody Formation ; Hypocalcemia ; Vitamin D Deficiency ; Vitamins
    Chemical Substances Vitamin D (1406-16-2) ; Receptors, Calcitriol ; Vitamins
    Language English
    Publishing date 2022-10-20
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2022.960405
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Vitamin D receptor absence does not enhance intestinal tumorigenesis in ApcPirc/+rats.

    Irving, Amy A / Waters, Bayley J / Seeman, Jeremy R / Plum, Lori A / DeLuca, Hector F

    Biology open

    2022  Volume 11, Issue 7

    Abstract: Epidemiological observations have prompted some to posit that elevated circulating vitamin D is responsible for reduced colon cancer in individuals residing near the equator. We have previously demonstrated that vitamin D has no effect on colon cancer in ...

    Abstract Epidemiological observations have prompted some to posit that elevated circulating vitamin D is responsible for reduced colon cancer in individuals residing near the equator. We have previously demonstrated that vitamin D has no effect on colon cancer in two rodent models of intestinal tumorigenesis. We have now extended this line of inquiry to ask whether ablation of vitamin D receptor (VDR) affects tumorigenesis. A VDR null rat was developed using Cas9-CRISPR technology, which allowed us to investigate whether 1,25(OH)D3 signaling through its receptor plays a role in intestinal tumorigenesis. Loss of VDR expression alone did not induce tumorigenesis, even in animals exposed to the inflammatory agent dextran sodium sulfate. These VDR-/- rats were then crossed with ApcPirc/+ rats, which are predisposed to the development of intestinal neoplasms. In combination with the Pirc/+ mutation, VDR loss did not enhance tumor multiplicity, growth, or progression in the colon or small intestine. This study demonstrates that the vitamin D receptor does not impact tumor development, and strongly supports previous findings that vitamin D itself does not play a role in colon cancer development or progression. Alternative explanations are needed for the original latitude hypothesis, as well as observational data in humans. This article has an associated First Person interview with the first author of the paper.
    MeSH term(s) Animals ; Animals, Genetically Modified ; Carcinogenesis/genetics ; Cell Transformation, Neoplastic ; Colonic Neoplasms/genetics ; Colonic Neoplasms/metabolism ; Humans ; Rats ; Receptors, Calcitriol/genetics ; Receptors, Calcitriol/metabolism ; Vitamin D/metabolism
    Chemical Substances Receptors, Calcitriol ; Vitamin D (1406-16-2)
    Language English
    Publishing date 2022-07-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2632264-X
    ISSN 2046-6390 ; 2046-6390
    ISSN (online) 2046-6390
    ISSN 2046-6390
    DOI 10.1242/bio.059290
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Vitamin D esters are the major form of vitamin D produced by UV irradiation in mice.

    Duchow, Elizabeth G / Sibilska-Kaminski, Izabela K / Plum, Lori A / DeLuca, Hector F

    Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

    2022  Volume 21, Issue 8, Page(s) 1399–1404

    Abstract: The primary source of vitamin D3 for humans is that produced in skin by ultraviolet irradiation. Ultraviolet (UV) B (UVB, 280-310 nm) light causes the isomerization of 7-dehydrocholesterol (7-DHC) to pre-vitamin D3 that is thermally isomerized to vitamin ...

    Abstract The primary source of vitamin D3 for humans is that produced in skin by ultraviolet irradiation. Ultraviolet (UV) B (UVB, 280-310 nm) light causes the isomerization of 7-dehydrocholesterol (7-DHC) to pre-vitamin D3 that is thermally isomerized to vitamin D3. In addition to free vitamin D3, it has been previously reported that esterified vitamin D3 is also found in the skin of rats irradiated with UVB. We found that a large fraction of the vitamin D3 precursor, 7-dehydrocholesterol is in the esterified form. Following UVB irradiation, vitamin D3 esters represent the majority of tissue vitamin D3, comprising approximately 80% in mice. Examination of vitamin D3 ester transport from skin in DBP
    MeSH term(s) Animals ; Cholecalciferol ; Esters ; Humans ; Mice ; Rats ; Skin/radiation effects ; Ultraviolet Rays ; Vitamin D/metabolism
    Chemical Substances Esters ; Vitamin D (1406-16-2) ; Cholecalciferol (1C6V77QF41)
    Language English
    Publishing date 2022-04-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 2072584-X
    ISSN 1474-9092 ; 1474-905X
    ISSN (online) 1474-9092
    ISSN 1474-905X
    DOI 10.1007/s43630-022-00230-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Design, synthesis, and biological activity of D-bishomo-1α,25-dihydroxyvitamin D

    Fabisiak, Adrian / Brzeminski, Pawel / Sicinski, Rafal R / Rochel, Natacha / Maj, Ewa / Filip-Psurska, Beata / Wietrzyk, Joanna / Plum, Lori A / DeLuca, Hector F

    European journal of medicinal chemistry

    2024  Volume 271, Page(s) 116403

    Abstract: The biologically active metabolite of vitamin ... ...

    Abstract The biologically active metabolite of vitamin D
    Language English
    Publishing date 2024-04-10
    Publishing country France
    Document type Journal Article
    ZDB-ID 188597-2
    ISSN 1768-3254 ; 0009-4374 ; 0223-5234
    ISSN (online) 1768-3254
    ISSN 0009-4374 ; 0223-5234
    DOI 10.1016/j.ejmech.2024.116403
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Vitamin D binding protein greatly improves bioactivity but is not essential for orally administered vitamin D.

    Duchow, Elizabeth G / Duchow, Mark W / Plum, Lori A / DeLuca, Hector F

    Physiological reports

    2021  Volume 9, Issue 23, Page(s) e15138

    Abstract: ... Vitamin ... ...

    Abstract Vitamin D
    MeSH term(s) Animals ; Calcium/blood ; Cholecalciferol/pharmacology ; Mice ; Mice, Knockout ; Skin/metabolism ; Skin/radiation effects ; Ultraviolet Rays ; Vitamin D-Binding Protein/genetics ; Vitamin D-Binding Protein/metabolism
    Chemical Substances Vitamin D-Binding Protein ; Cholecalciferol (1C6V77QF41) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2021-12-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2724325-4
    ISSN 2051-817X ; 2051-817X
    ISSN (online) 2051-817X
    ISSN 2051-817X
    DOI 10.14814/phy2.15138
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Synthesis and Biological Activity of 2,22-Dimethylene Analogues of 19-Norcalcitriol and Related Compounds.

    Sibilska-Kaminski, Izabela K / Sicinski, Rafal R / Plum, Lori A / DeLuca, Hector F

    Journal of medicinal chemistry

    2020  Volume 63, Issue 13, Page(s) 7355–7368

    Abstract: Continuing our search for vitamin D analogues, we explored the modification of the steroidal side chain and inserted a methylene moiety in position C-22 together with either lengthening the side chain or introducing a ring at the terminal end. Our ... ...

    Abstract Continuing our search for vitamin D analogues, we explored the modification of the steroidal side chain and inserted a methylene moiety in position C-22 together with either lengthening the side chain or introducing a ring at the terminal end. Our conformational studies confirmed that the presence of a methylene group attached to C-22 restricts the conformational flexibility of the side chain, which can result in changes in biological characteristics of a molecule. All synthesized 1α,25-dihydroxy-2,22-dimethylene-19-norvitamin D
    MeSH term(s) Animals ; Binding, Competitive ; Bone and Bones/drug effects ; Bone and Bones/metabolism ; Calcitriol/analogs & derivatives ; Calcitriol/pharmacology ; Calcium/metabolism ; Chemistry Techniques, Synthetic ; Dose-Response Relationship, Drug ; Drug Evaluation, Preclinical/methods ; Gene Expression Regulation/drug effects ; HL-60 Cells ; Humans ; Intestines/drug effects ; Luciferases/genetics ; Male ; Molecular Conformation ; Rats, Sprague-Dawley ; Receptors, Calcitriol/genetics ; Receptors, Calcitriol/metabolism ; Structure-Activity Relationship ; Transcription, Genetic
    Chemical Substances Receptors, Calcitriol ; VDR protein, human ; Luciferases (EC 1.13.12.-) ; Calcitriol (FXC9231JVH) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2020-06-24
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218133-2
    ISSN 1520-4804 ; 0022-2623
    ISSN (online) 1520-4804
    ISSN 0022-2623
    DOI 10.1021/acs.jmedchem.0c00580
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Novel superagonist analogs of 2-methylene calcitriol: Design, molecular docking, synthesis and biological evaluation.

    Sibilska-Kaminski, Izabela K / Fabisiak, Adrian / Brzeminski, Pawel / Plum, Lori A / Sicinski, Rafal R / DeLuca, Hector F

    Bioorganic chemistry

    2021  Volume 118, Page(s) 105416

    Abstract: A new series of highly biologically active (20S,22R)-1α,25-dihydroxy-22-methyl-2-methylene-vitamin ... ...

    Abstract A new series of highly biologically active (20S,22R)-1α,25-dihydroxy-22-methyl-2-methylene-vitamin D
    MeSH term(s) Animals ; Calcitriol/chemical synthesis ; Calcitriol/chemistry ; Calcitriol/pharmacology ; Cell Differentiation/drug effects ; Cell Proliferation/drug effects ; Dose-Response Relationship, Drug ; Drug Design ; HL-60 Cells ; Humans ; Molecular Docking Simulation ; Molecular Structure ; Rats ; Receptors, Calcitriol/agonists ; Recombinant Proteins/metabolism ; Structure-Activity Relationship
    Chemical Substances Receptors, Calcitriol ; Recombinant Proteins ; Calcitriol (FXC9231JVH)
    Language English
    Publishing date 2021-10-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120080-x
    ISSN 1090-2120 ; 0045-2068
    ISSN (online) 1090-2120
    ISSN 0045-2068
    DOI 10.1016/j.bioorg.2021.105416
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article: Analogs of 1α,25-Dihydroxyvitamin D₃ in Clinical Use.

    DeLuca, Hector F / Plum, Lori A

    Vitamins and hormones

    2016  Volume 100, Page(s) 151–164

    Abstract: Biologically active metabolites of vitamin D that have been successfully developed for the clinical market are described. Their properties that resulted in their success in the clinic are also provided. Precursors of the metabolically active 1α,25- ... ...

    Abstract Biologically active metabolites of vitamin D that have been successfully developed for the clinical market are described. Their properties that resulted in their success in the clinic are also provided. Precursors of the metabolically active 1α,25-dihydroxyvitamin D have been prepared and successfully marketed not only for renal failure patients but also for a variety of patients having metabolic bone disorders. Finally, successful analogs of 1α,25-dihydroxyvitamin D in use in the clinic worldwide are presented including properties that have contributed to their success.
    MeSH term(s) Bone and Bones/drug effects ; Bone and Bones/physiology ; Calcitriol/pharmacology ; Calcium/metabolism ; Homeostasis ; Humans ; Vitamin D/analogs & derivatives ; Vitamin D/chemistry ; Vitamin D/pharmacology
    Chemical Substances Vitamin D (1406-16-2) ; Calcitriol (FXC9231JVH) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2016
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 201161-x
    ISSN 2162-2620 ; 0083-6729
    ISSN (online) 2162-2620
    ISSN 0083-6729
    DOI 10.1016/bs.vh.2015.11.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: UV light suppression of EAE (a mouse model of multiple sclerosis) is independent of vitamin D and its receptor.

    Irving, Amy A / Marling, Steven J / Seeman, Jeremy / Plum, Lori A / DeLuca, Hector F

    Proceedings of the National Academy of Sciences of the United States of America

    2019  Volume 116, Issue 45, Page(s) 22552–22555

    Abstract: Vitamin D and sunlight have each been reported to protect against the development of experimental autoimmune encephalomyelitis (EAE), a mouse model of multiple sclerosis (MS). To date, the contribution of each has been unclear as ultra violet (UV) ... ...

    Abstract Vitamin D and sunlight have each been reported to protect against the development of experimental autoimmune encephalomyelitis (EAE), a mouse model of multiple sclerosis (MS). To date, the contribution of each has been unclear as ultra violet (UV) exposure also causes the generation of vitamin D in the skin. To examine whether the UV based suppression of EAE results, at least, in part from the production of vitamin D, we studied the effect of UV light on EAE in mice unable to produce 7-dehydroxycholesterol (7-DHC), the required precursor of vitamin D. Furthermore, we examined UV suppression of EAE in mice devoid of the vitamin D receptor (VDR). Our results demonstrate that UV light suppression of EAE occurs in the absence of vitamin D production and in the absence of VDR. Future investigations will focus on identifying the pathway responsible for the protective action of UV in EAE and presumably human MS.
    MeSH term(s) Animals ; Cholecalciferol/analogs & derivatives ; Cholecalciferol/metabolism ; Disease Models, Animal ; Encephalomyelitis, Autoimmune, Experimental/genetics ; Encephalomyelitis, Autoimmune, Experimental/metabolism ; Encephalomyelitis, Autoimmune, Experimental/therapy ; Female ; Humans ; Male ; Mice ; Mice, Inbred C57BL ; Multiple Sclerosis/genetics ; Multiple Sclerosis/metabolism ; Multiple Sclerosis/therapy ; Phototherapy ; Receptors, Calcitriol/genetics ; Receptors, Calcitriol/metabolism ; Skin/metabolism ; Skin/radiation effects ; Ultraviolet Rays ; Vitamin D/metabolism
    Chemical Substances Receptors, Calcitriol ; Vitamin D (1406-16-2) ; Cholecalciferol (1C6V77QF41) ; previtamin D(3) (HDA46400N5)
    Language English
    Publishing date 2019-10-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1913294116
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Vitamin D binding protein is required to utilize skin-generated vitamin D.

    Duchow, Elizabeth G / Cooke, Nancy E / Seeman, Jeremy / Plum, Lori A / DeLuca, Hector F

    Proceedings of the National Academy of Sciences of the United States of America

    2019  Volume 116, Issue 49, Page(s) 24527–24532

    Abstract: Vitamin D is produced in the skin following exposure to sunlight. Ultraviolet (UV) B (UVB, 280-310 nm) results in isomerization of 7-dehydrocholesterol to previtamin D that spontaneously isomerizes to vitamin D. This pool of skin-derived vitamin D is the ...

    Abstract Vitamin D is produced in the skin following exposure to sunlight. Ultraviolet (UV) B (UVB, 280-310 nm) results in isomerization of 7-dehydrocholesterol to previtamin D that spontaneously isomerizes to vitamin D. This pool of skin-derived vitamin D is the major source of vitamin D for animals. However, the mechanisms by which it becomes available remain undefined. It has been assumed that cutaneous vitamin D is transported into the circulation by vitamin D binding protein (DBP), but experimental evidence is lacking. To determine whether cutaneous vitamin D is transported by DBP, we utilized DBP
    MeSH term(s) Animals ; Hypocalcemia/genetics ; Hypocalcemia/metabolism ; Injections, Intravenous ; Mice, Knockout ; Recombinant Proteins/administration & dosage ; Recombinant Proteins/genetics ; Skin/metabolism ; Skin/radiation effects ; Ultraviolet Rays ; Vitamin D/metabolism ; Vitamin D Deficiency/genetics ; Vitamin D Deficiency/metabolism ; Vitamin D-Binding Protein/administration & dosage ; Vitamin D-Binding Protein/genetics ; Vitamin D-Binding Protein/metabolism
    Chemical Substances Recombinant Proteins ; Vitamin D-Binding Protein ; Vitamin D (1406-16-2)
    Language English
    Publishing date 2019-11-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1915442116
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top