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Published on: June 8, 2012
Phenotypic study of human gingival fibroblasts labeled with superparamagnetic anionic nanoparticles
Adrien Naveau1, Pierre Smirnov, Christine Ménager
1Laboratory of Arterial Development Research, Paris Descartes Medicine University, National Institute of Health and Medical Research Combined Team 0016, Paris, France. adrien.naveau@laposte.net
Journal of Periodontology
|February 8, 2006
Summary
Maghemite nanoparticles effectively label human gingival fibroblasts (HGFs) without altering their phenotype. Initial inflammatory responses were observed, but HGFs maintained their characteristics, validating nanoparticle use for cell labeling.
Area of Science:
- Biomaterials Science
- Cell Biology
- Nanotechnology
Background:
- A specific label for human gingival fibroblasts (HGFs) is lacking.
- Anionic maghemite nanoparticles offer a versatile labeling solution for various cell types.
- These nanoparticles are suitable for recognition in cellular, organotypical, and animal models.
Purpose of the Study:
- To investigate the effects of maghemite nanoparticle internalization on HGF phenotype.
- To evaluate the impact on connective tissue remodeling molecules and cytokine expression.
- To determine the suitability of maghemite nanoparticles as HGF labels.
Main Methods:
- Studied HGF phenotype in vitro after nanoparticle labeling.
- Assessed transcription and secretion of matrix metalloproteinases (MMPs), tissue inhibitors of metalloproteinases (TIMPs), and cytokines (TGF-beta1, TNF-alpha, IL-1beta, IL-4) using techniques like RT-PCR, Western blotting, zymography, and ELISA.
- Analyzed cell proliferation, uptake via Perls coloration and magnetophoresis.
Main Results:
- Observed high, heterogeneous nanoparticle distribution in HGFs.
- Detected increased secretion of MMP-1, -2, -3, and TIMP-2 at 24 hours post-labeling.
- Noted increased IL-1beta at day 1 and IL-4 at day 3, while TGF-beta1 and TNF-alpha remained unchanged.
Conclusions:
- Maghemite nanoparticle labeling induced IL-1beta secretion, likely driving MMP and TIMP increases.
- Subsequent IL-4 increase correlated with decreased MMP/TIMP synthesis.
- Despite transient inflammation, HGF phenotype remained unaffected, supporting nanoparticle use as labels.
