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Updated: Feb 13, 2026

Systemic and Local Drug Delivery for Treating Diseases of the Central Nervous System in Rodent Models
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Tetracyclines Inhibit Tissue Collagenases: Effects of Ingested Low-Dose and Local Delivery Systems.

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  • 1Pharmacology Department, Forsyth Dental Center, Boston, MA.

Journal of Periodontology
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Low-dose oral minocycline and tetracycline-loaded fibers effectively inhibit collagenase activity in periodontal disease. These treatments reduce collagen degradation without significantly altering subgingival microflora, offering a targeted approach for managing periodontal conditions.

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Area of Science:

  • Biochemistry
  • Periodontology
  • Pharmacology

Background:

  • Tetracyclines inhibit mammalian collagenases, suggesting therapeutic potential for diseases with excessive collagen degradation, like periodontal disease.
  • Previous studies showed standard tetracycline regimens significantly reduce collagenase activity in gingival crevicular fluid (GCF).

Purpose of the Study:

  • To evaluate the effect of low-dose (LD) oral minocycline on GCF collagenase activity and subgingival microflora.
  • To assess the in vitro efficacy of tetracycline-loaded monolithic fibers (TF) in inhibiting collagenase activity.

Main Methods:

  • Experiment I: Administered LD oral minocycline (40-80 mg/day) and measured GCF collagenase activity and subgingival microflora.
  • Experiment II: Incubated TF of varying lengths in vitro to determine released tetracycline concentrations and their effect on rat polymorphonuclear leukocyte collagenase activity.

Main Results:

  • LD minocycline therapy reduced GCF collagenase activity by 45-80% for at least several weeks post-treatment.
  • No significant changes in the proportions of Gram-positive, Gram-negative, or motile subgingival microorganisms were observed with LD minocycline.
  • In vitro, tetracycline released from TF inhibited rat polymorphonuclear leukocyte collagenase activity by 21% (3mm TF) and 45% (6mm TF).

Conclusions:

  • LD oral minocycline directly inhibits GCF collagenase activity, suggesting a localized effect rather than a broad antimicrobial action.
  • Tetracycline-loaded fibers can achieve therapeutic tetracycline concentrations in periodontal pockets to inhibit both tissue and bacterial collagenases.
  • These findings support the use of LD minocycline and TF as localized treatments for periodontal disease by targeting collagen degradation.