Effect of Oxytetracycline on In vitro Mineralization and Demineralization Reactions in the Absence and Presence of CollagenCorrespondence Address :
Dr. Monica Kakkar,
Associate Professor, Department of Biochemistry, Himalayan Institute of Medical Sciences,
SRHU, Swami Ram Nagar Jolly Grant, Dehradun-248001, Uttarakhand, India.
Introduction: Oxytetracycline and its derivatives routinely used to treat various ailments have also been shown to inhibit embryonic bone formation, mineralization in pregnant female rats and parathyroid hormone induced demineralization of bones. Oxytetracycline has also been routinely used as bone fluorochrome to study bone metabolism. However, despite the above observations, its mechanism of action is not clearly understood. Some studies tend to suggest that it acts by inhibiting collagen biosynthesis while others indicate that it acts without influencing collagen metabolism.
Aim: To study the mechanism by which oxytetracycline influences the mineralization and demineralization reactions.
Materials and Methods: Homogeneous and Heterogeneous systems of in vitro mineralization under physiological conditions of temperature, pH and ionic strength were used to investigate the effect of oxytetracycline not only on initial mineral phase formation but also on its subsequent growth or demineralization. In the Homogenous system, supersaturated conditions with respect to calcium and phosphate ions were employed to study their precipitation as mineral phase resembling hydroxyapatite in nature. However, in heterogeneous system, collagen isolated from sheep tendons was used to induce identical mineral phases under saturated conditions with respect to calcium and phosphate ions prevailing in the body fluids.
Results: The study demonstrated that in the homogeneous reaction system (mineralization in the absence of collagen) oxytetracycline inhibited both the initial mineral phase formation and its subsequent growth without influencing its demineralization. Moreover, in the heterogeneous system, oxytetracycline was found to inhibit not only the initial mineralization but also its subsequent growth or demineralization.
Conclusion: Oxytetracycline acted like crystal poisons to inhibit the mineralization and demineralization reactions by tightly associating with the mineral phase.
Bone metabolism, Inhibition, Mineral phase
Monica Kakkar, Rakesh Kakkar, Raj Kumar Jethi, Surinder Kumar Singla. EFFECT OF OXYTETRACYCLINE ON IN VITRO MINERALIZATION AND DEMINERALIZATION REACTIONS IN THE ABSENCE AND PRESENCE OF COLLAGEN. Journal of Clinical and Diagnostic Research [serial online] 2017 November [cited: 2017 Nov 22 ]; 11:BC01-BC04. Available from
Date of Submission: Jun 29, 2017
Date of Peer Review: Jul 24, 2017
Date of Acceptance: Sep 25, 2017
Date of Publishing: Nov 01, 2017
FINANCIAL OR OTHER COMPETING INTERESTS: None.
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