Polycaprolactone/Testicular Extracellular Matrix/Graphene Oxide-Based Electrospun Tubular Scaffolds for Reproductive Medicine: Biomimetic Architecture of Seminiferous Tubules

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Researchers fabricated electrospun tubular scaffolds from polycaprolactone, testicular extracellular matrix, and graphene oxide to mimic seminiferous tubules, finding the 0.5% GO formulation offered superior morphology, mechanical properties, and biocompatibility.

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The paper studies the fabrication and evaluation of biomimetic, electrospun tubular scaffolds intended for reproductive medicine by decellularizing testicular tissue to extract extracellular matrix (ECM) and incorporating it into polycaprolactone (PCL) fibers with varying graphene oxide (GO) concentrations (0.5%, 1%, 2%). They assess decellularization efficacy (DAPI, H&E, DNA quantification), confirm ECM component presence (Alcian blue, Orcein, Masson’s trichrome), and characterize scaffold physicochemical, structural, degradation, mechanical, and cytocompatibility performance (FTIR, SEM, degradation tests, mechanical testing, MTT assay) plus in vivo biocompatibility. The PCL/decellularized ECM scaffold with 0.5% GO shows the best fiber morphology, improved mechanical properties, and higher in vitro biocompatibility than other formulations, and is presented as a candidate platform for in vitro spermatogenesis with spermatogonial cells. The paper does not state specific limitations beyond the described evaluations, and it focuses on scaffold performance rather than demonstrating functional sperm production in the reported text. Relevance to endometriosis: endometrium/endometriosis research is referenced in author affiliations and at least one co-author is affiliated with an “Endometrium and Endometriosis Research Center,” though the scaffold topic is testicular seminiferous tubule bioengineering rather than endometriosis or adenomyosis mechanisms or therapies.

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Abstract

Numerous scaffolds are developed in the field of testicular bioengineering. However, effectively replicating the spatial characteristics of native tissue, poses a challenge in maintaining the requisite cellular arrangement essential for spermatogenesis. In order to mimic the structural properties of seminiferous tubules, the objective is to fabricate a biocompatible tubular scaffold. Following the decellularization process of the testicular tissue, validation of cellular remnants' elimination from the specimens is conducted using 4',6-diamidino-2-phenylindole staining, hematoxylin and eosin staining, and DNA content analysis. The presence of extracellular matrix (ECM) components is confirmed through Alcian blue, Orcein, and Masson's trichrome staining techniques. The electrospinning technique is employed to synthesize the scaffolds using polycaprolactone (PCL), extracted ECM, and varying concentrations of graphene oxide (GO) (0.5%, 1%, and 2%). Subsequently, comprehensive evaluations are performed to assess the properties of the synthetic scaffolds. These evaluations encompass Fourier-transform infrared spectroscopy, scanning electron microscopy imaging, scaffold degradation testing, mechanical behavior analysis, methylthiazolyldiphenyl-tetrazolium bromide assay, and in vivo biocompatibility assessment. The PCL/decellularized extracellular matrix with 0.5% GO formulation exhibits superior fiber morphology and enhanced mechanical properties, and outperforms other groups in terms of in vitro biocompatibility. Consequently, these scaffolds present a viable option for implementation in "in vitro spermatogenesis" procedures, holding promise for future sperm production from spermatogonial cells.
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Polycaprolactone/Testicular Extracellular Matrix/Graphene Oxide-Based Electrospun Tubular Scaffolds for Reproductive Medicine: Biomimetic Architecture of Seminiferous Tubules Amirhossein Mohammadi Stem Cell and Regenerative Medicine Research Center, Iran University of Medical Sciences, Tehran, 88770048 Iran Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran Search for more papers by this authorMorteza Koruji Stem Cell and Regenerative Medicine Research Center, Iran University of Medical Sciences, Tehran, 88770048 Iran Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran Search for more papers by this authorMahmoud Azami Department of Tissue Engineering, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, 1417755469 Iran Joint Reconstruction Research Center (JRRC), Tehran University of Medical Sciences, Tehran, 1417755469 Iran Search for more papers by this authorRonak Shabani Reproductive Sciences and Technology Research Center, Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614535 Iran Search for more papers by this authorSanam Mohandesnezhad Department of Tissue Engineering, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, 1417755469 Iran Search for more papers by this authorZahra Bashiri Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran Endometrium and Endometriosis Research Center, Hamadan University of Medical Sciences, Hamadan, 6517789971 Iran Omid Fertility & Infertility Clinic, Hamedan, 6516796198 Iran Search for more papers by this authorCorresponding Author Hamidreza Asgari Stem Cell and Regenerative Medicine Research Center, Iran University of Medical Sciences, Tehran, 88770048 Iran Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran E-mail: [email protected] Search for more papers by this authorAmirhossein Mohammadi Stem Cell and Regenerative Medicine Research Center, Iran University of Medical Sciences, Tehran, 88770048 Iran Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran Search for more papers by this authorMorteza Koruji Stem Cell and Regenerative Medicine Research Center, Iran University of Medical Sciences, Tehran, 88770048 Iran Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran Search for more papers by this authorMahmoud Azami Department of Tissue Engineering, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, 1417755469 Iran Joint Reconstruction Research Center (JRRC), Tehran University of Medical Sciences, Tehran, 1417755469 Iran Search for more papers by this authorRonak Shabani Reproductive Sciences and Technology Research Center, Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614535 Iran Search for more papers by this authorSanam Mohandesnezhad Department of Tissue Engineering, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, 1417755469 Iran Search for more papers by this authorZahra Bashiri Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran Endometrium and Endometriosis Research Center, Hamadan University of Medical Sciences, Hamadan, 6517789971 Iran Omid Fertility & Infertility Clinic, Hamedan, 6516796198 Iran Search for more papers by this authorCorresponding Author Hamidreza Asgari Stem Cell and Regenerative Medicine Research Center, Iran University of Medical Sciences, Tehran, 88770048 Iran Department of Anatomy, School of Medicine, Iran University of Medical Sciences, Tehran, 1449614525 Iran E-mail: [email protected] Search for more papers by this authorAbstract Numerous scaffolds are developed in the field of testicular bioengineering. However, effectively replicating the spatial characteristics of native tissue, poses a challenge in maintaining the requisite cellular arrangement essential for spermatogenesis. In order to mimic the structural properties of seminiferous tubules, the objective is to fabricate a biocompatible tubular scaffold. Following the decellularization process of the testicular tissue, validation of cellular remnants' elimination from the specimens is conducted using 4′,6-diamidino-2-phenylindole staining, hematoxylin and eosin staining, and DNA content analysis. The presence of extracellular matrix (ECM) components is confirmed through Alcian blue, Orcein, and Masson's trichrome staining techniques. The electrospinning technique is employed to synthesize the scaffolds using polycaprolactone (PCL), extracted ECM, and varying concentrations of graphene oxide (GO) (0.5%, 1%, and 2%). Subsequently, comprehensive evaluations are performed to assess the properties of the synthetic scaffolds. These evaluations encompass Fourier-transform infrared spectroscopy, scanning electron microscopy imaging, scaffold degradation testing, mechanical behavior analysis, methylthiazolyldiphenyl-tetrazolium bromide assay, and in vivo biocompatibility assessment. The PCL/decellularized extracellular matrix with 0.5% GO formulation exhibits superior fiber morphology and enhanced mechanical properties, and outperforms other groups in terms of in vitro biocompatibility. Consequently, these scaffolds present a viable option for implementation in “in vitro spermatogenesis” procedures, holding promise for future sperm production from spermatogonial cells. Conflict of Interest The authors declare no conflict of interest. Data Availability Statement The data that support the findings of this study are available from the corresponding author upon reasonable request. References - 1M. C. Inhorn, P. Patrizio, Hum. Reprod. Update 2015, 21, 411. - 2M. E. Thoma, A. C. Mclain, J. F. Louis, R. B. King, A. 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