Application of amniotic membrane as xenograft for urethroplasty in rabbit

Shakeri, Saeed; Haghpanah, Abdolreza; Khezri, Abdolaziz; Yazdani, Maryam; Monabbati, Ahmad; Haghpanah, Sezaneh; Malekmakan, Leila; Ayrempour, Soroush

doi:10.1007/s11255-009-9532-2

Cited by 26 publications

(18 citation statements)

References 39 publications

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“…The overall low complication rate was comparable to previous reports 26-32. One animal in the treated group (5.6%) died due to sepsis.…”

Section: Discussionsupporting

confidence: 87%

“…The technique of applying HAMs in reconstructive urology was introduced for the first time in 1955 although only a few groups applied AM to repair the urinary tract wall 25. Reconstruction of urethrae with HAMs in a rabbit model showed a proper re-epithelialization, and even better results could be achieved with a denuded human amniotic scaffold inoculated with primary rabbit urethral epithelial cells 26, 27. A Polish group described a technique to supplement long ureteral wall strictures (5.5 cm) by using folded HAM allografts and presented good, sustainable results after an average follow-up period of 25.2 months 28.…”

Section: Discussionmentioning

confidence: 99%

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Bladder Reconstruction with Human Amniotic Membrane in a Xenograft Rat Model: A Preclinical Study

Barski¹,

Gerullis²,

Ecke³

et al. 2017

Int. J. Med. Sci.

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Background: Human amniotic membranes (HAMs) are assumed to have a number of unique characteristics including durability, hypoallergenic and anti-inflammatory properties.Materials and Methods: Multilayer HAMs from caesarian sections were applied to repair defined bladder defects in male Sprague-Dawley rats. The animals were sacrificed at 7, 21 and 42 days after implantation. Bladder volume capacity after grafting was measured. Histological analyses were performed to asses a number of parameters including HAM degradation, inflammatory reaction, graft rejection and smooth muscle ingrowth.Results: One rat died from sepsis in the treated group. No severe complications or signs of leakage were observed. Bladder capacity did not change over time. The initially increased inflammation in the HAM group diminished significantly over time (p<0.05). No signs of HAM degradation were observed and smooth muscle staining increased over time.Conclusions: HAMs appear to be durable and hypoallergenic grafts. The assumed suitability for the reconstruction of urinary tract justifies further research on detailed immunological process in larger grafts.

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“…The overall low complication rate was comparable to previous reports 26-32. One animal in the treated group (5.6%) died due to sepsis.…”

Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Bladder Reconstruction with Human Amniotic Membrane in a Xenograft Rat Model: A Preclinical Study

Barski¹,

Gerullis²,

Ecke³

et al. 2017

Int. J. Med. Sci.

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“…The amniotic membrane has been recently used widely and successfully in ophthalmology for corneal and conjunctival reconstructions (16), burn dressing (17), urethroplasty (18), vestibuloplasty (19), surgical dressings (20), myelomeningocele (21), long ureteral stricture construction (22), bladder reconstruction (23), and other modalities. The amniotic membrane is composed of the connective tissue with a significant collagen and extracellular matrix composition.…”

Section: Discussionmentioning

confidence: 99%

Application of Human Amniotic Membrane in Canine Penile Tunica Albuginea Defect: First Step toward an Innovating New Method for Treatment of Peyronie?s Disease

et al. 2014

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ARTICLE INFO ______________________________________________________________ ______________________Purposes: To evaluate the efficacy of human amniotic membrane (AM) grafting in the canine penile tunica albuginea defect; we developed an animal model as the first step toward an innovating new method for the treatment of Peyronie's disease, penile cancers, and congenital deformities of the penis. Material and Methods:From August to September 2011, ten healthy male dogs were selected. A rhomboid incision about 3x2cm over the tunica albuginea and its overlying squamous epithelium was made and then excised. The amniotic membrane was folded twice on itself and grafted on the defect. After 8 weeks, artificial erection was made for 5 dogs and for the other 5 dogs after 12 weeks. After artificial erection, partial penectomy was done and histopathological evaluation was performed on the grafts. Results: Artificial erection performed successfully in all of the dogs. No infection or any other complication was seen. Histopathological examination showed complete re-epithelialization with squamous epithelium and collagen fiber deposition. Also, no dysplasia was seen. Conclusions:The amniotic membrane can be used as a suitable substitution for tunica albuginea. It is safe, inexpensive, biodegradable, and available and may be used for the treatment of Peyronie's disease, penile cancers, congenital penile deformities, and penile reconstructive surgery.

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“…The surgical procedures of urethral injury model and urethroplasty have been described in detail elsewhere [ 15 ]. Briefly, after i.p.…”

Section: Methodsmentioning

confidence: 99%

Urethral Reconstruction with Tissue-Engineered Human Amniotic Scaffold in Rabbit Urethral Injury Models

Yuan

2014

Med Sci Monit

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BackgroundMitigating urethral injury remains a great challenge for urologists due to lack of ideal biomaterials for urethroplasty. The application of amniotic membrane (AM) over other synthetic materials makes it a better potential source for urethral reconstruction. We separated the basement layer of AM to obtain denuded human amniotic scaffold (dHAS) and then inoculated primary rabbit urethral epithelial cells on the surface of dHAS to determine whether this strategy minimizes potential rejection and maximizes the biocompatibility of human AM.Material/MethodsAfter the successful acquisition of dHAS from AM, cell-seeded dHAS were prepared and characterized. Both cell-seeded dHAS and acellular dHAS were subcutaneously implanted. Immune responses were compared by histological evaluation and CD4+ cell and CD8+ cell infiltrations. Then they were applied as urethroplastic materials in the rabbit models of urethral injury to fully explore the feasibility and efficacy of tissue-engineered dHAS xenografts in urethral substitution application.ResultsMild inflammatory infiltration was observed in cell-seeded dHAS grafts, as revealed by fewer accumulations of CD4+ cells and CD8+ cells (or neutrophils or other immune cells). Urethral defects of rabbits in the urethroplastic group with dHAS implantation (n=6) were completely resolved in 1 month, while there were 1 infection and 1 fistula in the control group with acellular dHAS patches (n=6). Histopathological analysis revealed mild immune response in the cell-seeded dHAS group (P<0.05).ConclusionsTissue-engineered dHAS minimizes potential rejection and maximizes the biocompatibility of AM, which makes it a potential ideal xenograft for urethral reconstruction.

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Application of amniotic membrane as xenograft for urethroplasty in rabbit

Abstract: The result from this study suggests that amniotic membrane is an inexpensive, easy, and biodegradable graft with very little antigen effect which seems to be the ideal solution for urethroplasty.

Cited by 26 publications

References 39 publications

Bladder Reconstruction with Human Amniotic Membrane in a Xenograft Rat Model: A Preclinical Study

Bladder Reconstruction with Human Amniotic Membrane in a Xenograft Rat Model: A Preclinical Study

Application of Human Amniotic Membrane in Canine Penile Tunica Albuginea Defect: First Step toward an Innovating New Method for Treatment of Peyronie?s Disease

Urethral Reconstruction with Tissue-Engineered Human Amniotic Scaffold in Rabbit Urethral Injury Models

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