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Related Experiment Videos

Enzymatic activity toward poly(L-lactic acid) implants.

J M Schakenraad1, M J Hardonk, J Feijen

  • 1University of Groningen, Department of Histology and Cell Biology, The Netherlands.

Journal of Biomedical Materials Research
|May 1, 1990
PubMed
Summary
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Biodegradable poly(L-lactic acid) implants show good tissue compatibility. Enzyme activity patterns confirm a mild foreign body response and the polymer's biodegradable nature, indicated by lactic acid release.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Enzymology

Background:

  • Assessing tissue response to biodegradable implants is crucial for medical applications.
  • Poly(L-lactic acid) (PLLA) is a widely used biodegradable polymer in biomedical devices.
  • Understanding cellular enzymatic activity provides insights into implant-tissue interactions.

Purpose of the Study:

  • To investigate the enzymatic profiles of cellular responses to PLLA implants.
  • To differentiate between normal wound healing and foreign body reactions.
  • To confirm the biodegradability of PLLA through enzymatic markers.

Main Methods:

  • Implantation of PLLA in a study model.
  • Monitoring of seven key enzyme activities (alkaline phosphatase, acid phosphatase, esterase, beta-glucuronidase, ATP-ase, NADH-reductase, lactate dehydrogenase) over time.

Related Experiment Videos

  • Cell type identification using enzyme patterns, morphology, and location.

    • Main Results:

    • Early influx of granulocytes with specific enzyme activities (alkaline phosphatase, beta-glucuronidase).
    • Macrophages exhibiting ATP-ase, acid phosphatase, and esterase from day 3.
    • Increased lactate dehydrogenase (LDH) and NADH-reductase in macrophages and fibroblasts from day 7, exceeding levels seen with inert materials.
    • Overall, a mild foreign body reaction with minor macrophage and giant cell activity observed over 3 weeks.

    Conclusions:

    • PLLA demonstrates good tissue compatibility.
    • The observed enzyme patterns are primarily indicative of wound healing.
    • Elevated LDH and NADH-reductase levels suggest lactic acid release, confirming PLLA biodegradability.