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Effects of menatetrenone on the decrease in calcium balance induced by vitamin K-deficient diet and sodium loading in
T Tomiuga1, M Kobayashi, Y Nakajima
1Department of Drug Research II, Eisai Co., Ltd, Tokyo, Japan.
Japanese Journal of Pharmacology
|May 1, 1994
Summary
Menatetrenone (MK-4) supplementation significantly improved calcium balance in rats with vitamin K deficiency. MK-4 enhanced calcium absorption, suggesting its potential role in managing calcium homeostasis.
Area of Science:
- Biochemistry
- Nutritional Science
- Physiology
Background:
- Vitamin K is crucial for calcium metabolism.
- Vitamin K deficiency can impair calcium balance.
- Menatetrenone (MK-4) is a synthetic form of vitamin K2.
Purpose of the Study:
- To investigate the effects of menatetrenone (MK-4) on calcium balance in rats.
- To determine if MK-4 can restore calcium balance impaired by vitamin K deficiency and high sodium intake.
- To assess the impact of MK-4 on intestinal calcium absorption.
Main Methods:
- Rats were fed a vitamin K-deficient diet, with some receiving latamoxef to induce deficiency.
- MK-4 was administered orally or subcutaneously in varying doses.
- Calcium balance was measured by analyzing intake and excretion in urine and feces.
- Intestinal calcium transport was assessed using an everted gut-sac technique.
Main Results:
- Vitamin K deficiency and latamoxef treatment reduced calcium balance, which was improved by MK-4.
- A high-sodium, vitamin K-deficient diet significantly decreased calcium balance, dose-dependently restored by MK-4.
- MK-4 administration restored reduced intestinal calcium transport in rats on the deficient diet.
Conclusions:
- Menatetrenone (MK-4) effectively improves calcium balance in rats experiencing vitamin K deficiency.
- MK-4 enhances calcium balance by increasing intestinal calcium absorption.
- These findings suggest MK-4's therapeutic potential for conditions involving impaired calcium homeostasis.