Medicinal technology developments have several goals,
depending on the application. In some cases, the goal is to develop a
completely new therapy which did not exist before. In other cases, it is to
take an existing therapy and reformulate it to improve either efficacy or
convenience. Oral formulations are well known to be more convenient for both
patient and practitioner as, unlike parental injections, they can be easily
self-administered by a patient, are not painful, and do not require handling/safe-disposal
of blood-exposed syringes which could potential spread bloodborne pathogens. Diabetes,
notably, requires a great deal of injection-based therapy as part of its
treatment. One type of this therapy is Exanatide, a glucagen-like peptide 1
receptor which acts to treat type 2 diabetes. Currently Exanatide is only
available as an injectable formulation (Bydureon) as oral uptake is very poor.
Recently, researchers at Binzhou Medical University, Yantai University, Luye
Pharmaceutical Co, and Peking University (China) use PLGA-PEG-Mal (PolyVivo
AI020) and mPEG-PLGA (AK037, AK102) from PolySciTech (www.polyscitech.com) to develop Fc
decorated nanoparticles capable of crossing the intestinal mucosa for more
effective delivery. This research holds promise to provide for a more
convenient and effective therapy for diabetes. Read more: Shi, Yanan, Xinfeng
Sun, Liping Zhang, Kaoxiang Sun, Keke Li, Youxin Li, and Qiang Zhang.
"Fc-modified exenatide-loaded nanoparticles for oral delivery to improve
hypoglycemic effects in mice." Scientific Reports 8, no. 1 (2018): 726. https://www.nature.com/articles/s41598-018-19170-y
“Abstract: To improve the oral efficiency of exenatide, we
prepared polyethylene glycol-poly(lactic-co-glycolic acid) (PEG-PLGA) NPs
modified with Fc (NPs-Fc) for exenatide oral delivery. Exenatide was
encapsulated into the NPs by the w/o/w emulsion-solvent evaporation method. The
particle size of the NPs-Fc was approximately 30 nm larger than that of the
unmodified NPs with polydispersity indices in a narrow range (PDIs;
PDI < 0.3) as detected by DLS, and the highest encapsulation efficiency of
exenatide in the NPs was greater than 80%. Fc-conjugated NPs permeated Caco-2
cells faster and to a greater extent compared to unmodified NPs, as verified by
CLSM and flow cytometry. Hypoglycemic effect studies demonstrated that oral
administration of exenatide-loaded PEG-PLGA NPs modified by an Fc group
extended the hypoglycemic effects compared with s.c. injection of the exenatide
solution. Fluorescence-labeled NPs were used to investigate the effects of Fc
targeting, and the results demonstrated that the NPs-Fc stayed in the gastrointestinal
tract for a longer time in comparison with the unmodified NPs, as shown by the
whole-body fluorescence images and fluorescence images of the dissected organs
detected by in vivo imaging in live mice. Therefore, Fc-targeted nano-delivery systems
show great promise for oral peptide/protein drug delivery.”
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