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Dexamethasone-Loaded Lipomers: Development, Characterization, and Skin Biodistribution Studies.

Eloy Pena-Rodríguez1, Maria Lajarin-Reinares1, Aida Mata-Ventosa2,3,4

  • 1Topical & Oral Development R+D Reig Jofre Laboratories, 08970 Barcelona, Spain.

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New lipomer nanoparticles effectively target hair follicles for topical drug delivery. These dexamethasone-loaded lipomers show potential for treating hair follicle-related diseases with reduced inflammation.

Keywords:
alopecia areatabiodistributiondexamethasoneethyl cellulosefollicular targetinglipid polymer hybrid nanocapsuleslipomersskin

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Area of Science:

  • Pharmaceutics
  • Nanotechnology
  • Dermatology

Background:

  • Follicular targeting is crucial for topical drug delivery, offering depot effects and treatment for hair follicle diseases.
  • Lipid core ethyl cellulose lipomers present a promising nanocarrier system for enhanced follicular delivery.

Purpose of the Study:

  • To develop and characterize dexamethasone-loaded lipomers for follicular targeting.
  • To evaluate the in vitro release, skin biodistribution, and anti-inflammatory efficacy of the lipomers.

Main Methods:

  • Lipomer formulation and physicochemical characterization (size, polydispersity, Z-potential).
  • In vitro drug release studies using Franz diffusion cells.
  • Confocal microscopy and immunofluorescence for skin biodistribution analysis.
  • In vitro anti-inflammatory assay (TNFα) and cytotoxicity testing.

Main Results:

  • Optimized lipomers (115 nm, PDI 0.24, +30 mV) successfully encapsulated dexamethasone.
  • Lipomers demonstrated sustained in vitro drug release and significant accumulation in pig skin hair follicles.
  • Dexamethasone-loaded lipomers exhibited potent in vitro anti-inflammatory effects and good safety profiles.

Conclusions:

  • Dexamethasone-loaded lipid core ethyl cellulose lipomers are effective for follicular targeting and topical delivery.
  • This nanoformulation holds significant potential for treating inflammatory hair follicle-related conditions.