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Effect of Stabilizers on Bioactivity of Peptide-24 in PLGA Microspheres

[ Vol. 9 , Issue. 8 ]


Mingbo Wang, XiaoDong Guo, Rongwei Tan, Zhending She and Qingling Feng   Pages 1123 - 1128 ( 6 )


In the present study, Poly (D,L-lactide-co-glycolide) microspheres (PLGA MSs) were prepared for delivering a novel oligopeptide derived from rhBMP-2 (Peptide-24). Hydroxypropyl-β-cyclodextrin (HP-β-CD) and Bovine serum albumin (BSA) were used as stabilizers for retaining bioactivity of the oligopeptide. The morphology, diameter, drugloading rates and encapsulation rates of the PLGA MSs were detected and compared. The PLGA MSs were incubated for 3 and 30 days respectively to obtain the release supernatant containing Peptide-24. The structure and bioactivity of released Peptide-24 from PLGA MSs were evaluated through physicochemical detections and cell culture. The structure integrity of the Peptide-24 was confirmed by Far-UV circular dichroism and matrix-assisted laser desorption/ionization time-of-flight Mass Spectrometer (MALDI-TOF-MS) analysis. The interaction between PLGA matrix and loaded Peptide- 24 was verified through Raman. The results showed that the diameter of PLGA MSs was from 8.62 to 15.34 μm, the loading rate was 0.7-0.8%, and the encapsulation rate was 69.3-85.3%. The released Peptide-24 from PLGA MSs was proved to retain original bioactivity by the cellular activity and alkaline phosphatase (ALP) test. HP-β-CD is a kind of excellent stabilizer for retaining the bioactivity of Peptide-24 in PLGA MSs.


Poly (D, L-lactide-co-glycolide), microencapsulation, peptides, stabilization, cell culture, bioactivity.


Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

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