Different effects of oxytetracycline and doxycycline on mitochondrial protein synthesis in rat liver after long-term treatment.

Abstract:

:The tetracyclines inhibit specifically mitochondrial (mt) and bacterial protein synthesis when they are present in low concentrations (2-10 micrograms/ml). There is no difference between the various members of this group of antibiotics in this respect. In the present study, however, it is shown that the inhibitory effect of doxycycline on mt-protein synthesis in rat liver is partially lost after continuous treatment for more than 1 week, whereas oxytetracycline continues to inhibit mt-protein synthesis effectively after 1 week of treatment. To find an explanation for this difference between doxycycline and oxytetracycline, a detailed study was made of the distribution and the effects on mt-protein synthesis of both tetracyclines under various conditions in rat liver. The results of the studies lead to the hypothesis that doxycycline treatment induces the formation of a doxycycline complex, and thus to a reduced amount of free doxycycline. This may explain the loss of effective inhibition of mt-protein synthesis.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

van den Bogert C,Holtrop M,Melis TE,Roefsema PR,Kroon AM

doi

10.1016/0006-2952(87)90126-2

subject

Has Abstract

pub_date

1987-05-01 00:00:00

pages

1555-9

issue

9

eissn

0006-2952

issn

1873-2968

pii

0006-2952(87)90126-2

journal_volume

36

pub_type

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