hypervitaminosis a/phosphatase

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Alterations in kidney enzyme pattern in acute hypervitaminosis A.

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The relation of excessive doses of vitamin A with various kidney pathologies is well known however, information concerning the relation of kidney enzyme activity with acute hypervitaminosis A is rather scarce. In this study we describe the kidney enzymatic alterations observed in rats that received

[Effect of high doses of retinol acetate on the 3-beta-ol-steroid dehydrogenase and alkaline phosphatase content in mouse ovaries].

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The author reports on the effects of different doses of retinol acetate on ovarian steroidogenesis. Two groups of CBA/C57BL mice with a mean body weight of 18-20 g received 3.44% oily retinol acetate per os in daily doses of 50 000 and 80 000 IU for 10 days. After completion of the experiments the

Hypervitaminosis A inducing intra-hepatic cholestasis--a rare case report.

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The use of over-the-counter supplements is commonplace in today's health conscious society. We present an unusual case of intrahepatic cholestasis caused by vitamin A intoxication. The patient consumed one Herbalife shake with two multivitamin tablets of the same brand for 12 years. When calculated

Retinoic acid induces rapid mineralization and expression of mineralization-related genes in chondrocytes.

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Numerous studies of experimental hypo- and hypervitaminosis A have long suggested that retinoic acid (RA) is involved in chondrocyte maturation during endochondral ossification and skeletogenesis. However, the specific and direct roles of RA in these complex processes remain unclear. Based on recent

Early effects of high doses of retinol (vitamin A) on the in situ cellular metabolism in rat liver.

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Understanding of the possible toxicity associated with hypervitaminosis A becomes increasingly important in view of the popularity of vitamin A supplementation. Hypervitaminosis A for many years may eventually lead to hepatocellular damage. In the present study, rats were treated for 7 days with

Preliminary toxicity profile of arotinoids SMR-2 and SMR-6 in male B6D2F1 mice.

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Arotinoids, which are analogs of retinoic acid (RA) and retinol (RO) with the carbon skeleton in a rigid conformation, have more favorable therapeutic indices relative to all-trans-RA and all-trans-RO. The purpose of this investigation was to obtain preliminary in vivo toxicity data on SMR-2(analog

Retinoic acid cross-talk with calcitriol activity in Atlantic salmon (Salmo salar).

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Vitamins A (VA) and D (VD) are metabolised by vertebrates to bioactive retinoic acid (RA) and calcitriol (CTR). RA and CTR involvement in bone metabolism requires fine-tuned regulation of their synthesis and breakdown. In mammals antagonism of VA and VD is observed, but the mechanism of interaction

Effect of vitamin A in enteral formulae for burned guinea-pigs.

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A burned guinea-pig model (30 per cent body surface area) was used to study the effects of dietary vitamin A. Sixty-five female guinea-pigs were infused enterally via gastrostomy feeding tubes with identical formulate (175 kcal/kg/day, 20 per cent of calories as protein) containing varying amounts

The Antagonist of Retinoic Acid Receptor α, ER-50891 Antagonizes the Inhibitive Effect of All-Trans Retinoic Acid and Rescues Bone Morphogenetic Protein 2-Induced Osteoblastogenic Differentiation.

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Hypervitaminosis A, alcoholism or medical treatment for acute promyelocytic leukaemia may cause unphysiologically high accumulation of all-trans retinoic acid (ATRA), which could inhibit osteoblastogenesis, thereby triggering osteoporosis. We have shown that bone morphogenetic

Excessive dietary intake of vitamin A reduces skull bone thickness in mice.

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Calvarial thinning and skull bone defects have been reported in infants with hypervitaminosis A. These findings have also been described in humans, mice and zebrafish with loss-of-function mutations in the enzyme CYP26B1 that degrades retinoic acid (RA), the active metabolite of vitamin A,

Lack of an effect of multivitamins containing vitamin A on serum retinyl esters and liver function tests in healthy women.

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Two hundred eighty-four female adults (aged 40-70 years) were longitudinally studied to investigate the relationship between dietary supplemental vitamin A and serum biochemical markers of vitamin A toxicity. Serum retinol, retinyl esters, and retinol-binding protein (RBP), alkaline phosphatase and

Fine structure and cytochemistry of lysosomes in the Ito cells of the rat liver.

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Ultracytochemical studies of the performic acid-phosphotungstic acid (PFP) reaction and acid phosphatase (ACPase) activity in the Ito cells (fat-storing cells) of the rat liver revealed two kinds of lipid droplets: one surrounded by a structure giving PFP- and ACPase-positive reactions, recognized

Heterodimeric BMP-2/7 antagonizes the inhibition of all-trans retinoic acid and promotes the osteoblastogenesis.

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OBJECTIVE Hypervitaminosis A and alcoholism can result in a low mineral density and compromised regenerative capacity of bone, thus delaying implant osteointegration. The inhibitory effect of all-trans retinoic acid on osteoblastogenesis is considered to be one of the mechanisms. We hypothesized

Retinoids and cancer: antitumor effect of ATRA and of a new derivative of retinoic acid, IIF, on colon carcinoma cell lines CaCo-2 and HT-29.

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Vitamin A and its metabolic forms, like all-trans retinoic acid (ATRA), are used with promising results in the treatment of many tumors. Two major problems in the clinical use of retinoids are that the doses needed for successful treatment are often toxic, leading to "hypervitaminosis A syndrome"

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