A biodegradable long-term contraceptive implant with steady levonorgestrel release based on PLGA microspheres embedded in PCL-coated implant

Author(s):  
Baolin Zhu ◽  
Yifan Chen ◽  
Wenjie Lu ◽  
Qing Zhang ◽  
Song Gao ◽  
...  
2020 ◽  
Vol 7 (5) ◽  
pp. 515-525
Author(s):  
Yuzhu He ◽  
Yahui Jin ◽  
Xiaoxia Ying ◽  
Qiong Wu ◽  
Shenglian Yao ◽  
...  

Abstract The repair of infective bone defects is a great challenge in clinical work. It is of vital importance to develop a kind of bone scaffold with good osteogenic properties and long-term antibacterial activity for local anti-infection and bone regeneration. A porous mineralized collagen (MC) scaffold containing poly(d,l-lactide-co-glycolic acid) (PLGA) microspheres loaded with two antibacterial synthetic peptides, Pac-525 or KSL-W was developed and characterized via scanning electron microscopy (SEM), porosity measurement, swelling and mechanical tests. The results showed that the MC scaffold embedded with smooth and compact PLGA microspheres had a positive effect on cell growth and also had antibacterial properties. Through toxicity analysis, cell morphology and proliferation analysis and alkaline phosphatase evaluation, the antibacterial scaffolds showed excellent biocompatibility and osteogenic activity. The antibacterial property evaluated with Staphylococcus aureus and Escherichia coli suggested that the sustained release of Pac-525 or KSL-W from the scaffolds could inhibit the bacterial growth aforementioned in the long term. Our results suggest that the antimicrobial peptides-loaded MC bone scaffold has good antibacterial and osteogenic activities, thus providing a great promise for the treatment of infective bone defects.


2016 ◽  
Vol 36 (10) ◽  
pp. 1124-1129 ◽  
Author(s):  
Stefano Pompei ◽  
Dora Evangelidou ◽  
Floriana Arelli ◽  
Gianluigi Ferrante

2006 ◽  
Vol 105 (5) ◽  
pp. 745-752 ◽  
Author(s):  
Anne Sapin ◽  
Anne Clavreul ◽  
Emmanuel Garcion ◽  
Jean-Pierre Benoit ◽  
Philippe Menei

Object Irradiated autologous tumor cells are commonly used as a source of antigens in antiglioma vaccinations to activate the immune system. As cell number is often a limiting factor in these cells’ preparation, the aim of the present study was to find a means that can lower the amount of cells required. Among strategies currently developed, adjuvant particulate systems offer a promising means to improve the antitumor immune response. In this study, the authors were interested in evaluating the role of particulate systems containing biodegradable microspheres that carry tumor cell fractions on their surfaces in the induction of a protective immunity in the 9L/Fischer 344 rat glioma model. The efficiency of these particulate systems was compared to that of irradiated 9L cells. Methods Particulate systems composed of poly(d,l-lactide-co-glycolide) (PLGA) microspheres that support 9L cell fractions on their surfaces (cell lysates or plasma membranes) or irradiated 9L cells alone were injected subcutaneously into the flanks of syngeneic Fischer 344 rats. Eighteen days later, the rats were intracranially injected with nonirradiated 9L cells. A study of survival in these animals and an analysis of the resulting immune response were then conducted. For the same amount of protein (50 μg) injected, irradiated 9L cells provided long-term survival in 30% of animals, whereas 9L plasma membranes adsorbed onto PLGA microspheres provided long-term survival in 10% of animals and cell lysates adsorbed onto microspheres provided long-term survival in 0%. Accordingly, particulate systems induced a lower T helper cell Type 1 (Th1) peripheral immune response than irradiated 9L cells. However, greater secretion of Th1 cytokines was observed when particulate systems were used than when cell fractions separated from microspheres were used, indicating the adjuvant property of these particulate systems. Conclusions Particulate systems have adjuvant properties but are still less efficient than irradiated whole tumor cells for vaccinations. Encapsulation of an activating molecule in the microsphere will be the next developmental step in the search for efficient antiglioma vaccinations.


Contraception ◽  
2014 ◽  
Vol 90 (3) ◽  
pp. 313
Author(s):  
M. Steiner ◽  
R. Callahan ◽  
D. Taylor ◽  
D. Jenkins ◽  
D. Owen ◽  
...  

2021 ◽  
Vol 10 (43) ◽  
pp. 3689-3693
Author(s):  
Dalya Thamer Ahmed

BACKGROUND Nexplanon is a pregnancy-prevention device that is both safe and reliable. It is a novel reversible long-term contraceptive technique. It's a modern long-acting contraceptive device with a subcutaneous implant that releases etonogestrel (ENG). The main objective of this research was to determine the distribution, tolerability, and adverse reactions of Nexplanon among females who used it in Baghdad and find any relationship between these side effects and the acceptability of the device among contraceptive users. METHODS This study was done via the participation of 80 women who were using Nexplanon at the time of study or had recently removed the implant; the data was obtained from a direct interview and medical records. RESULTS The total number of women enrolled for the study was 80. The mean age of contributors was 33.24 (± 2.69) years. None of the participants was nulliparous; 15 % had two children, 85 % had three or more children. Of the participants, 26.25 % and 65 % had secondary and higher education degrees respectively, while only 7 % had primary education and none of the participants had any education. 6.25 % were smokers, only 28.75 % had irregular cycle and the remaining percentage had a regular one. 57 (71.25 %) of them underwent adverse events while using the contraceptive implant, the most common one was bleeding disorders most likely in the form of light intermittent bleeding. 69 (86.25 %) from those only 18 (26.08 %) removed implant because of this irritant bleeding, the next common adverse event was headache 44 (55 %), 8 (18.18 %) of them removed the implant because of headache, 41 (51.25 %) underwent variable mood swing changes, 36 (45 %) suffered from weight gain with use of the implant, 33 (41.25 %) nausea and bowel habits changes, androgenic effects presented in 19 (23.75 %) and 10 (12.5 %) in the form of acne and hirsutism, respectively. 3 (10.34 %) of them removed the device as they could not cope with this complication, only 6 (7.5 %) suffered from low sexual desire. CONCLUSIONS Nexplanon can be a suitable alternative for women who have been adequately informed about long-term contraception but bleeding disturbances and cycle durations (> 8 days) are also key indicators for early removal. The process of consulting the patient and giving them the appropriate educational advice on this subject should be a priority before using the implant, in addition to establishing special induction and educational programs. KEY WORDS Nexplanon, Contraception Method Contraception Method, A Subcutaneous Implant and Etonogestrel.


Drug Delivery ◽  
2021 ◽  
Vol 28 (1) ◽  
pp. 2427-2446
Author(s):  
MJ Rodrigo ◽  
D Garcia-Herranz ◽  
A Aragón-Navas ◽  
M Subias ◽  
T Martinez-Rincón ◽  
...  

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