Summary
Morphologic changes in a rat skeletal muscle cell line (L6) exposed for 1 h to the parenteral antibiotics amphotericin B (AMP), tetracycline-HCl (TET), erythromycin lactobionate (ERY), and cephaloridine (CEP) were characterized by transmission and scanning electron microscopy and compared to cellular release of creatine phosphokinase (CRK). AMP (0.05, 0.1, 0.5 mg/ml) caused a concentration-related swelling of nuclei, endoplasmic reticulum, and mitochondria. Loss of membrane integrity associated with AMP exposure was evident at the middle concentration and extensive at the high concentration, which correlated well with the 43 and 90% depletion of CPK from the muscle cells, respectively. TET (0.25, 1.0, 2.5 mg/ml) caused dilation of endoplasmic reticulum and cytoplasmic blebbing at the low concentration but had no effect on the cytoplasmic membrane or CPK. Cells exposed to the high concentration of TET had extensive damage to the cytoplasmic membrane, and CPK was completely depleted. ERY (2.5, 5.0, 25 mg/ml) caused a pattern of morphologic changes and CPK depletion similar to TET. CEP (4.0, 20, 50 mg/ml) had no effect on membrane integrity or CPK; however, membranous whorls were prominent in the cytoplasm. A good correlation between CPK release and cytoplasmic membrane integrity was evident and the ability of these agents to release CPK from muscle cells in culture correlated with the known irritancy potential of these parenteral antibiotics. Furthermore, CPK depletion seems to be a reliable indicator of muscle cell damage after cytoplasmic membrane perturbation and is therefore an appropriate index of toxicity in this in vitro muscle irritation model.
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Laska, D.A., Williams, P.D., White, S.L. et al. In vitro correlation of ultrastructural morphology and creatine phosphokinase release in L6 skeletal muscle cells after exposure to parenteral antibiotics. In Vitro Cell Dev Biol 26, 393–398 (1990). https://doi.org/10.1007/BF02623831
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DOI: https://doi.org/10.1007/BF02623831