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Ascorbic acid regulates mouse spermatogonial stem cell proliferation in a Wnt/β-catenin/ROS signaling dependent manner. Theriogenology 2022; 184:61-72. [DOI: 10.1016/j.theriogenology.2022.02.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 02/28/2022] [Accepted: 02/28/2022] [Indexed: 11/17/2022]
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Photodynamic Activity of Protoporphyrin IX-Immobilized Cellulose Monolith for Nerve Tissue Regeneration. Int J Mol Sci 2022; 23:ijms23031035. [PMID: 35162958 PMCID: PMC8835291 DOI: 10.3390/ijms23031035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 01/14/2022] [Accepted: 01/14/2022] [Indexed: 12/11/2022] Open
Abstract
The development of nerve conduits with a three-dimensional porous structure has attracted great attention as they closely mimic the major features of the natural extracellular matrix of the nerve tissue. As low levels of reactive oxygen species (ROS) function as signaling molecules to promote cell proliferation and growth, this study aimed to fabricate protoporphyrin IX (PpIX)-immobilized cellulose (CEPP) monoliths as a means to both guide and stimulate nerve regeneration. CEPP monoliths can be fabricated via a simple thermally induced phase separation method and surface modification. The improved nerve tissue regeneration of CEPP monoliths was achieved by the activation of mitogen-activated protein kinases, such as extracellular signal-regulated kinases (ERKs). The resulting CEPP monoliths exhibited interconnected microporous structures and uniform morphology. The results of in vitro bioactivity assays demonstrated that the CEPP monoliths with under 0.54 ± 0.07 μmol/g PpIX exhibited enhanced photodynamic activity on Schwann cells via the generation of low levels of ROS. This photodynamic activation of the CEPP monoliths is a cell-safe process to stimulate cell proliferation without cytotoxic side effects. In addition, the protein expression of phospho-ERK increased considerably after the laser irradiation on the CEPP monoliths with low content of PpIX. Therefore, the CEPP monoliths have a potential application in nerve tissue regeneration as new nerve conduits.
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Cao Y, Dai Z, Lao H, Zhao H. Dimethyloxaloylglycine promotes spermatogenesis activity of spermatogonial stem cells in Bama minipigs. J Vet Sci 2022; 23:e35. [PMID: 35363442 PMCID: PMC8977544 DOI: 10.4142/jvs.21308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/20/2022] [Accepted: 01/27/2022] [Indexed: 12/03/2022] Open
Abstract
Background The testis has been reported to be a naturally O2-deprived organ, dimethyloxaloylglycine (DMOG) can inhibit hypoxia inducible factor-1alpha (HIF-1α) subject to degradation under normal oxygen condition in cells. Objectives The objective of this study is to detect the effects of DMOG on the proliferation and differentiation of spermatogonial stem cells (SSCs) in Bama minipigs. Methods Gradient concentrations of DMOG were added into the culture medium, HIF-1α protein in SSCs was detected by western blot analysis, the relative transcription levels of the SSC-specific genes were analyzed using quantitative reverse transcription polymerase chain reaction (qRT-PCR). Six days post-induction, the genes related to spermatogenesis were detected by qRT-PCR, and the DNA content was determined by flow cytometry. Results Results revealed that the levels of HIF-1α protein increased in SSCs with the DMOG treatment in a dose-dependent manner. The relative transcription levels of SSC-specific genes were significantly upregulated (p < 0.05) by activating HIF-1α expression. The induction results showed that DMOG significantly increased (p < 0.05) the spermatogenesis capability of SSCs, and the populations of haploid cells significantly increased (p < 0.05) in DMOG-treated SSCs when compared to those in DMOG-untreated SSCs. Conclusion We demonstrate that DMOG can promote the spermatogenesis activity of SSCs.
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Affiliation(s)
- Yaqi Cao
- College of Life Science and Technology, Guangxi University, Nanning 530005, China
| | - ZiFu Dai
- College of Life Science and Technology, Guangxi University, Nanning 530005, China
| | - Huizhen Lao
- College of Life Science and Technology, Guangxi University, Nanning 530005, China
| | - Huimin Zhao
- College of Life Science and Technology, Guangxi University, Nanning 530005, China
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Singh SP, Kharche SD, Pathak M, Ranjan R, Soni YK, Singh MK, Pourouchottamane R, Chauhan MS. Low oxygen tension potentiates proliferation and stemness but not multilineage differentiation of caprine male germline stem cells. Mol Biol Rep 2021; 48:5063-5074. [PMID: 34148207 DOI: 10.1007/s11033-021-06501-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 06/15/2021] [Indexed: 11/29/2022]
Abstract
The milieu of male germline stem cells (mGSCs) is characterized as a low-oxygen (O2) environment, whereas, their in-vitro expansion is typically performed under normoxia (20-21% O2). The comparative information about the effects of low and normal O2 levels on the growth and differentiation of caprine mGSCs (cmGSCs) is lacking. Thus, we aimed to investigate the functional and multilineage differentiation characteristics of enriched cmGSCs, when grown under hypoxia and normoxia. After enrichment of cmGSCs through multiple methods (differential platting and Percoll-density gradient centrifugation), the growth characteristics of cells [population-doubling time (PDT), viability, proliferation, and senescence], and expression of key-markers of adhesion (β-integrin and E-Cadherin) and stemness (OCT-4, THY-1 and UCHL-1) were evaluated under hypoxia (5% O2) and normoxia (21% O2). Furthermore, the extent of multilineage differentiation (neurogenic, adipogenic, and chondrogenic differentiation) under different culture conditions was assessed. The survival, viability, and proliferation were significantly (p < 0.05) improved, thus, yielding a significantly (p < 0.05) higher number of viable cells with larger colonies under hypoxia. Furthermore, the expression of stemness and adhesion markers were distinctly upregulated under lowered O2 conditions. Conversely, the differentiated regions and expression of differentiation-specific genes [C/EBPα (adipogenic), nestin and β-tubulin (neurogenic), and COL2A1 (chondrogenic)] were significantly (p < 0.05) reduced under hypoxia. Overall, the results demonstrate that culturing cmGSCs under hypoxia augments the growth characteristics and stemness but not the multilineage differentiation of cmGSCs, as compared with normoxia. These data are important to develop robust methodologies for ex-vivo expansion and lineage-committed differentiation of cmGSCs for clinical applications.
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Affiliation(s)
- Shiva Pratap Singh
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, Uttar Pradesh, 281122, India.
| | - Suresh Dinkar Kharche
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, Uttar Pradesh, 281122, India
| | - Manisha Pathak
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, Uttar Pradesh, 281122, India
| | - Ravi Ranjan
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, Uttar Pradesh, 281122, India
| | - Yogesh Kumar Soni
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, Uttar Pradesh, 281122, India
| | - Manoj Kumar Singh
- Animal Genetics and Breeding Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, Uttar Pradesh, 281122, India
| | - Ramasamy Pourouchottamane
- Animal Physiology and Reproduction Division, ICAR-Central Institute for Research on Goats, Makhdoom, Farah, Mathura, Uttar Pradesh, 281122, India
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The effect of extracellular vesicles on the regulation of mitochondria under hypoxia. Cell Death Dis 2021; 12:358. [PMID: 33824273 PMCID: PMC8024302 DOI: 10.1038/s41419-021-03640-9] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 03/12/2021] [Accepted: 03/15/2021] [Indexed: 02/07/2023]
Abstract
Mitochondria are indispensable organelles for maintaining cell energy metabolism, and also are necessary to retain cell biological function by transmitting information as signal organelles. Hypoxia, one of the important cellular stresses, can directly regulates mitochondrial metabolites and mitochondrial reactive oxygen species (mROS), which affects the nuclear gene expression through mitochondrial retrograde signal pathways, and also promotes the delivery of signal components into cytoplasm, causing cellular injury. In addition, mitochondria can also trigger adaptive mechanisms to maintain mitochondrial function in response to hypoxia. Extracellular vesicles (EVs), as a medium of information transmission between cells, can change the biological effects of receptor cells by the release of cargo, including nucleic acids, proteins, lipids, mitochondria, and their compositions. The secretion of EVs increases in cells under hypoxia, which indirectly changes the mitochondrial function through the uptake of contents by the receptor cells. In this review, we focus on the mitochondrial regulation indirectly through EVs under hypoxia, and the possible mechanisms that EVs cause the changes in mitochondrial function. Finally, we discuss the significance of this EV-mitochondria axis in hypoxic diseases.
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Shu H, Yuan B, Huang Y, Wang L, He B, Sun Q, Sun L. High expression of ABCG2 is associated with chemotherapy resistance of osteosarcoma. J Orthop Surg Res 2021; 16:85. [PMID: 33509236 PMCID: PMC7842061 DOI: 10.1186/s13018-021-02204-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 01/04/2021] [Indexed: 12/18/2022] Open
Abstract
Objectives Previous studies showed overexpression of ABCG2 in a variety of tumor tissues, which could potentially indicate the probability of chemotherapy resistance. This study aimed to reveal the role of ABCG2 in the development of chemotherapy resistance and the prognosis of osteosarcoma (OS). Methods Sixty-eight OS patients were included in this study. Tumor tissues were collected for each patient during surgery. DOX-resistant OS cell lines were induced by consecutive exposure of gradually increasing concentration of DOX to the parental cell lines. Lentivirus was used for the knockdown of ABCG2 in OS cells. Cells were treated with the gradient concentration of DOX, and the viability was assessed by CCK8 assay. Total RNA was isolated from the tumor tissues or tumor cells, and the expression of ABCG2 was analyzed by qPCR. The relationship between ABCG2 expression and clinicopathological characteristics of the patients was analyzed using Student’s t test or the Chi-square test. The overall survival time was calculated by the Kaplan-Meier method and analyzed by the log-rank test. p < 0.05 was considered statistically significant. Results DOX-resistant OS cells were successfully established through continuous exposure to DOX. Forty-eight hours after DOX exposure, the IC 50 value of DOX-resistant HOS cells and DOX-resistant U2OS was 3.5 μM and 3.25 μM, respectively. By contrast, those of the untreated HOS and U2OS cells were 1.15 μM and 0.93 μM, respectively (p < 0.01). The mRNA expression level of ABCG2 was significantly increased in DOX-resistant cell lines. The CCK-8 assay showed that the DOX-resistant HOS cells and DOX-resistant U2OS cells transfected with ShABCG2 were more sensitive to the DOX treatment than those transfected with ShCtrl. Analysis of gene expression in OS tissues showed remarkably higher expression of ABCG2 as compared with adjacent normal tissues (p < 0.01). Patients with high expression level of ABCG2 had obviously decreased overall survival time than the patients with normal expression (p < 0.01). Conclusions ABCG2 expression level was significantly associated with the resistance to chemotherapy and the overall survival of OS patients. ABCG2 may be a promising therapeutic target for OS patients. Supplementary Information The online version contains supplementary material available at 10.1186/s13018-021-02204-z.
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Affiliation(s)
- Hao Shu
- Department of Orthopedics, Sports Medicine Center, Affiliated Hospital of Nanjing University of Chinese Medicine, Hanzhong Road 115, Nanjing, 210029, China
| | - Bin Yuan
- Department of Orthopedics, Sports Medicine Center, Affiliated Hospital of Nanjing University of Chinese Medicine, Hanzhong Road 115, Nanjing, 210029, China
| | - Yao Huang
- Department of Orthopedics, Sports Medicine Center, Affiliated Hospital of Nanjing University of Chinese Medicine, Hanzhong Road 115, Nanjing, 210029, China
| | - Lei Wang
- Department of Orthopedics, Sports Medicine Center, Affiliated Hospital of Nanjing University of Chinese Medicine, Hanzhong Road 115, Nanjing, 210029, China
| | - Bing He
- Department of Orthopedics, Sports Medicine Center, Affiliated Hospital of Nanjing University of Chinese Medicine, Hanzhong Road 115, Nanjing, 210029, China
| | - Qi Sun
- Department of Pathology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Luning Sun
- Department of Orthopedics, Sports Medicine Center, Affiliated Hospital of Nanjing University of Chinese Medicine, Hanzhong Road 115, Nanjing, 210029, China.
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