2 research outputs found
Sequence-Controlled Delivery of Peptides from Hierarchically Structured Nanomaterials
Peptide
drugs delivered orally need to be protected from degradation for achieving
their functions. To fulfill the complicated task of oral drug delivery,
we present a hierarchically structured drug-delivery system that can
undertake structural changes, so multiple functions can be triggered
by a sequence of stimuli. Such hierarchical system is achieved in
a nanoparticle-in-nanofiber configuration, in which both the nanofibers
and the nanoparticles are pH-responsive and biocompatible. A model
peptide is efficiently encapsulated under mild condition, and the
nanocarriers are further electrospun with a pH-responsive mucoadhesive
polymer. The nanoparticles are released from the nanofibers, and thereafter
the peptides are released from the nanoparticles in a pH-responsive
manner. The nanoparticles are compatible with caco-2 cells, and the
endocytosis of the nanoparticles is described in detail
Nanocarrier for Oral Peptide Delivery Produced by Polyelectrolyte Complexation in Nanoconfinement
The hydrophilic peptide YY (PYY)
is a promising hormone-based antiobesity
drug. We present a new concept for the delivery of PYY from pH-responsive
chitosan-based nanocarriers. To overcome the drawbacks while retaining
the merits of the polyelectrolyte complex (PEC) method, we propose
a one-pot approach for the encapsulation of a hydrophilic peptide
drug in cross-linked PEC nanocarriers. First, the hydrophilic peptide
is encapsulated via polyelectrolyte complexation within water-in-oil
miniemulsion droplets. In a second step, the PEC surface is reinforced
by controlled interfacial cross-linking. PYY is efficiently encapsulated
and released upon pH change. Such nanocarriers are promising candidates
for the fight against obesity and, in general, for the oral delivery
of protein drugs