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Site-specific methylene blue delivery to pilosebaceous structures using highly porous nylon microspheres: an
Serge Mordon1, Chryslain Sumian, Jean Marie Devoisselle
1UPRES EA 2689 INSERM-IFR 114, Pavillon Vancostenobel, Lille University Hospital, 59037 Lille, France. mordon@lille.inserm.fr
Purpose:
This study aimed to evaluate the penetration of methylene blue (MB)-loaded microspheres into pilosebaceous structures of rats.
Materials And Methods:
MB was incorporated into 5 microm highly porous nylon microspheres. The microspheres were dispersed into fluid silicone. Male hairless rats were used to evaluate the penetration of MB into hair follicles. After formulation application, MB diffusion was induced and skin biopsies were realized immediately, 2 and 26 hours after MB loaded microspheres application. MB fluorescence was observed with a microscope expanded for fluorescence microscopy.
Results:
Position of microspheres and MB diffusion was dependent on delay between microspheres application and harvest. Inside the skin, MB was seen exclusively in the hair follicle and the sebaceous glands. MB diffusion varied from 160+/-50 microm (2 hours after application) to 410+/-70 microm (26 hours after application). MB was also found in the sebaceous glands.
Discussion:
This study confirms that 5 micro m microspheres are optimally deposited deep within the pilosebaceous structure. In agreement with the literature, when microspheres are topically applied on the skin, they penetrate via a "lipid-rich channel" coating the hair follicles. MB is exclusively distributed in the hair follicles and their accessories.
Conclusion:
This report presents evidence of MB pilosebaceous delivery through the use of microsphere formulation. This is obtained thanks to topical enhancement via the follicular route. This drug delivery system aims to transport MB into the pilosebaceous unit specifically and deeply. Various other applications could derive from this work. For example, such a method might be used to increase the therapeutic index of drugs directed at hair sebaceous gland disorders. Laser treatment of acne or laser hair removal could also benefit of this technique.
Insights
Highly porous nylon microspheres effectively deliver methylene blue (MB) deep into rat pilosebaceous units. This topical drug delivery system targets hair follicles and sebaceous glands for enhanced therapeutic applications.
Area of Science:
- Dermatology
- Drug Delivery Systems
- Nanotechnology
Background:
- The pilosebaceous unit is a key target for various dermatological treatments.
- Effective delivery of therapeutic agents to the pilosebaceous unit remains a challenge.
- Microsphere formulations offer potential for targeted drug delivery.
Purpose of the Study:
- To evaluate the penetration of methylene blue (MB)-loaded microspheres into the pilosebaceous structures of rats.
- To assess the efficacy of microspheres for topical drug delivery via the follicular route.
Main Methods:
- Methylene blue (MB) was incorporated into 5 µm highly porous nylon microspheres.
- Microspheres were dispersed in fluid silicone and applied to the skin of male hairless rats.
- Skin biopsies were analyzed for MB fluorescence at various time points post-application using fluorescence microscopy.
Main Results:
- MB-loaded microspheres demonstrated deep penetration into the pilosebaceous structures.
- MB fluorescence was exclusively observed within hair follicles and sebaceous glands.
- Diffusion depth of MB increased from 160±50 µm at 2 hours to 410±70 µm at 26 hours post-application.
Conclusions:
- 5 µm microspheres are optimally deposited within the pilosebaceous unit.
- Topical application of microspheres facilitates penetration via lipid-rich channels along hair follicles.
- This microsphere formulation enables targeted and deep delivery of MB to the pilosebaceous unit, with potential applications for various skin disorders.