Quantification of nanoparticle uptake into hair follicles in pig ear and human forearm.
Drug delivery via the hair follicle (HF) especially with nanoparticles (NP) recently gained attention due to a depot effect and facilitated absorption conditions within the lower HF. With the prospect of transdermal drug delivery, it is of interest to optimize the follicular uptake of NP. In this study, a method was developed to quantify NP uptake into HF and applied in vitro in a pig ear model and in vivo in human volunteers. The influence of NP material on HF uptake was investigated using fluorescence-labeled NP based on poly(D,L-lactide-co-glycolide) (PLGA). All NP had similar hydrodynamic sizes (163-170 nm) but different surface modifications: (i) plain PLGA, (ii) chitosan-coated PLGA (Chit.-PLGA), and (iii) Chit.-PLGA coated with different phospholipids (PL) (DPPC (100), DPPC:Chol (85:15), and DPPC:DOTAP (92:8). Differential stripping was performed, including complete mass balance. The samples were extracted for fluorescence quantification. An effect of the PL coating on follicular uptake was observed as DPPC (100) and DPPC:DOTAP (92:8) penetrated into HF to a higher extent than the other tested NP. The effect was observed both in the pig ear model as well as in human volunteers, although it was statistically significant only in the in vitro model. An excellent in vitro-in vivo correlation (IVIVC, r(2)=0.987) between both models was demonstrated, further supporting the suitability of the pig ear model as a surrogate for the in vivo situation in humans for quantifying NP uptake into HF. These findings may help to optimize NP for targeting the HF and to improve transdermal delivery.
Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbruecken, Germany.
A S
AS
Raber
Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbruecken, Germany.
A
A
Mittal
Philipps University Marburg, Pharmaceutical Technology and Biopharmacy, Marburg, Germany.
J
J
Schäfer
Philipps University Marburg, Pharmaceutical Technology and Biopharmacy, Marburg, Germany.
U
U
Bakowsky
Department of Dermatology, Saarland University Hospital, Homburg/Saar, Germany.
J
J
Reichrath
Department of Dermatology, Saarland University Hospital, Homburg/Saar, Germany.
T
T
Vogt
Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbruecken, Germany.
U F
UF
Schaefer
Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbruecken, Germany; Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research, Saarbruecken, Germany. Electronic address: steffihansen@web.de.
S
S
Hansen
Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbruecken, Germany; Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research, Saarbruecken, Germany.
C-M
CM
Lehr
D000279:Administration, Cutaneous; D000818:Animals; D048271:Chitosan / Q000378:metabolism; D004337:Drug Carriers; D004423:Ear; D005260:Female; D005456:Fluorescent Dyes / Q000378:metabolism; D005542:Forearm; D018859:Hair Follicle / Q000378:metabolism*; D006801:Humans; D019344:Lactic Acid / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D008297:Male; D053758:Nanoparticles; D010316:Particle Size; D010743:Phospholipids / Q000378:metabolism; D011100:Polyglycolic Acid / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D012869:Skin Absorption; D013499:Surface Properties; D013552:Swine
D004337:Drug Carriers; D005456:Fluorescent Dyes; D010743:Phospholipids; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D048271:Chitosan
Hair follicle; In vitro–in vivo correlation; Nanoparticle; Phospholipid coating; Pig ear skin