Meclocycline is a tetracycline antibiotic with broad antimicrobial activity. Meclocycline inhibits lactate dehydrogenase (LDH) release and cell toxicity induced by expression of htt-N63-148Q, a mutant form of the huntingtin gene, without altering htt-N63-148Q protein levels in PC12 cells.
Demeclocycline calcium is a semisynthetic tetracycline antibiotic which was derived from a strain of Streptomyces aureofaciens. Demeclocycline binds to bacterial 30S ribosomal subunit and prevents binding of aminoacyl-tRNA to the mRNA-ribosome complex, thereby inhibiting protein synthesis. Demeclocycline also inhibits the effect of vasopressin on the renal tubules, thereby causing diuresis.