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http://dx.doi.org/10.1172/JCI193400 | DOI Listing |
Cancers (Basel)
September 2023
UniSA Clinical and Health Sciences, University of South Australia, Adelaide, SA 5001, Australia.
Vitamin D deficiency or insufficiency is prevalent in childhood cancer patients and survivors after chemotherapy; further studies are needed to investigate the underlying aetiology and effectiveness of vitamin D supplementation in preventing chemotherapy-induced bone loss. This study used a rat model of treatment with antimetabolite methotrexate to investigate whether methotrexate chemotherapy causes vitamin D deficiency and if vitamin D supplementation attenuates the resultant bone loss. Methotrexate treatment (five daily injections) decreased serum vitamin D levels (from 52 to <30 ng/mL), reduced body and bone lengthening and tibial trabecular bone volume, and altered intestinal vitamin D metabolism, which was associated with intestinal mucosal damage known to cause malabsorption of nutrients, including dietary vitamin D and calcium.
View Article and Find Full Text PDFChemosphere
October 2023
School of Medicine, Royal College of Surgeons in Ireland-Medical University of Bahrain, Busaiteen, Bahrain.
Introduction: A class of flame retardants, polybrominated diethyl ethers (PBDEs), are known endocrine disrupters and may induce the hepatic enzymes CYP24 and CYP3A that promote 25-hydroxylation of vitamin D. Therefore, this study examined the association of PBDEs with vitamin D (25(OH)D) and the active 1,25-dihydrovitamin D (1,25(OH)D) in a cohort of non-obese women.
Methods: 58 female participants (age:31.
Sichuan Da Xue Xue Bao Yi Xue Ban
November 2022
Department of Obstetrics, Xiamen Maternal and Child Health Hospital/Women and Children's Hospital Affiliated to Xiamen University , Xiamen Key Laboratory of Basic and Clinical Research on Major Obstetrical Diseases, Xiamen 361000, China.
Objective: To investigate the regulatory effect and mechanism of vitamin D on the local renin-angiotensin system at maternal-fetal interface in the pathological process of preeclampsia (PE).
Methods: The mRNA and protein expression of renin in decidua of normal pregnancy and PE placentas was determined by RT-PCR and Western blot. Normal decidual tissues were treated with active and inactive vitamin D for 48 h and the expressions of renin and vitamin D deactivating enzyme CYP24A1 were determined by RT-PCR and Western blot.
ACS Appl Mater Interfaces
April 2022
BioSeeds Corporation, JAIST venture business laboratory, Ishikawa Create Labo, Asahidai 2-13, Nomi City, Ishikawa 923-1211, Japan.
Overexpression of the vitamin D3-inactivating enzyme CYP24A1 (cytochrome P450 family 24 subfamily and hereafter referred to as CYP24) can cause chronic kidney diseases, osteoporosis, and several types of cancers. Therefore, CYP24 inhibition has been considered a potential therapeutic approach. Vitamin D3 mimetics and small molecule inhibitors have been shown to be effective, but nonspecific binding, drug resistance, and potential toxicity limit their effectiveness.
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