1
|
Kim S, Bae H, Kim HS. Dedifferentiated Leiomyosarcoma of the Uterine Corpus with Heterologous Component: Clinicopathological Analysis of Five Consecutive Cases from a Single Institution and Comprehensive Literature Review. Diagnostics (Basel) 2024; 14:160. [PMID: 38248037 PMCID: PMC10814992 DOI: 10.3390/diagnostics14020160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/04/2024] [Accepted: 01/08/2024] [Indexed: 01/23/2024] Open
Abstract
Dedifferentiation is a very rare phenomenon in uterine leiomyosarcoma (LMS). The aim of this study was to comprehensively analyze the clinicopathological characteristics of uterine dedifferentiated LMS (DDLMS). We reviewed electronic medical records and pathology slides from five patients with uterine DDLMS and performed immunostaining. The mean age of the patients was 56 years. Two patients presented with abdominal discomfort, while in three cases the uterine tumors were detected on routine medical examination. The mean size of the tumors was 17.0 cm. Four patients underwent hysterectomy. The initial stages were distributed as IB (2/5), IIIC (2/5), and IVC (1/5). Post-operative concurrent chemoradiation therapy, radiation therapy, and chemotherapy were administered in one, one, and two patients, respectively. Despite post-operative treatment, three patients developed metastatic recurrences in the abdominal and pelvic organs. Recurrence-free survival time ranged between 4 and 30 months. Histologically, the differentiated areas demonstrated the classic morphology of malignant smooth muscle differentiation, whereas the dedifferentiated areas resembled undifferentiated pleomorphic sarcoma and were characterized by large pleomorphic tumor cells admixed with haphazardly arranged atypical cells with marked nuclear pleomorphism. All cases also exhibited heterologous components, including chondrosarcoma (CSA; 3/5) and rhabdomyosarcoma (2/5). In two cases, the heterologous components were initially detected in primary tumors. In three cases, the primary tumors did not exhibit any dedifferentiated or heterologous components. Instead, more than half of the recurrent tumors consisted of heterologous components. Three cases showed a sharp demarcation between the LMS and CSA components, while in two cases the dedifferentiated area imperceptibly merged with the differentiated component. Immunostaining revealed that the dedifferentiated components exhibited a lack of desmin immunoreactivity in three of the four examined cases. A subset of uterine LMS represents various amounts and types of dedifferentiation and heterologous components in both primary and recurrent tumors. Routine recognition of DDLMS and distinction from its mimickers are required for accurate diagnosis and further characterization of these rare tumors.
Collapse
Affiliation(s)
- Suyeon Kim
- Department of Pathology and Translational Genomics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea;
| | - Hyunsik Bae
- Pathology Center, Seegene Medical Foundation, Seoul 04805, Republic of Korea
| | - Hyun-Soo Kim
- Department of Pathology and Translational Genomics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea;
| |
Collapse
|
2
|
Liao CM, Luo T, von der Ohe J, de Juan Mora B, Schmitt R, Hass R. Human MSC-Derived Exosomes Reduce Cellular Senescence in Renal Epithelial Cells. Int J Mol Sci 2021; 22:13562. [PMID: 34948355 PMCID: PMC8709122 DOI: 10.3390/ijms222413562] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/10/2021] [Accepted: 12/14/2021] [Indexed: 12/23/2022] Open
Abstract
Cellular senescence of renal tubular cells is associated with chronic diseases and age-related kidney disorders. Therapies to antagonize senescence are, therefore, explored as novel approaches in nephropathy. Exosomes derived from human mesenchymal stroma-/stem-like cells (MSC) entail the transfer of multiple bioactive molecules, exhibiting profound regenerative potential in various tissues, including therapeutic effects in kidney diseases. Here, we first demonstrate that exosomes promote proliferation and reduce senescence in aged MSC cultures. For potential therapeutic perspectives in organ rejuvenation, we used MSC-derived exosomes to antagonize senescence in murine kidney primary tubular epithelial cells (PTEC). Exosome treatment efficiently reduced senescence while diminishing the transcription of senescence markers and senescence-associated secretory phenotype (SASP) factors. Concomitantly, we observed less DNA damage foci and more proliferating cells. These data provide new information regarding the therapeutic property of MSC exosomes in the development of renal senescence, suggesting a contribution to a new chapter of regenerative vehicles in senotherapy.
Collapse
Affiliation(s)
- Chieh Ming Liao
- Department of Nephrology and Hypertension, Hannover Medical School, 30625 Hannover, Germany; (C.M.L.); (B.d.J.M.); (R.S.)
| | - Tianjiao Luo
- Biochemistry and Tumor Biology Lab, Department of Gynecology and Obstetrics, Hannover Medical School, 30625 Hannover, Germany; (T.L.); (J.v.d.O.)
| | - Juliane von der Ohe
- Biochemistry and Tumor Biology Lab, Department of Gynecology and Obstetrics, Hannover Medical School, 30625 Hannover, Germany; (T.L.); (J.v.d.O.)
| | - Blanca de Juan Mora
- Department of Nephrology and Hypertension, Hannover Medical School, 30625 Hannover, Germany; (C.M.L.); (B.d.J.M.); (R.S.)
| | - Roland Schmitt
- Department of Nephrology and Hypertension, Hannover Medical School, 30625 Hannover, Germany; (C.M.L.); (B.d.J.M.); (R.S.)
| | - Ralf Hass
- Biochemistry and Tumor Biology Lab, Department of Gynecology and Obstetrics, Hannover Medical School, 30625 Hannover, Germany; (T.L.); (J.v.d.O.)
| |
Collapse
|
3
|
Luo T, von der Ohe J, Hass R. MSC-Derived Extracellular Vesicles in Tumors and Therapy. Cancers (Basel) 2021; 13:cancers13205212. [PMID: 34680359 PMCID: PMC8533755 DOI: 10.3390/cancers13205212] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 10/15/2021] [Indexed: 12/24/2022] Open
Abstract
Simple Summary Therapeutic functions of mesenchymal stroma-/stem-like cells (MSCs) are mediated predominantly through paracrine effects by the release of various different components. Upon recruitment of MSCs to damaged tissue sites or tumors, several bioactive molecules and organelles that are secreted by MSCs among others are cytokines, chemokines, metabolites, and extracellular vesicles including exosomes. The MSC-mediated cargo of released exosomes contains specific proteins and nucleic acids with varying regulatory microRNAs according to the tissue origin and the MSC microenvironment. These MSC-released exosomes are taken up by different target cells in damaged tissues to promote a regulatory network of tissue repair, including immune modulation and induction of angiogenesis. Conversely, in tumors, MSC-derived exosomes can confer predominant signals to suppress neovascularization and to relay further tumor-inhibitory effects. However, MSCs that adapted to the tumor tissue by mutual interaction with cancer cells progressively alter to an aberrant phenotype with the release of exosomes carrying tumor-supportive material. Abstract Exosomes derived from mesenchymal stroma-/stem-like cells (MSCs) as part of extracellular vesicles are considered cell-free biocompatible nanovesicles that promote repair activities of damaged tissues or organs by exhibiting low immunogenic and cytotoxic effects. Contributions to regenerative activities include wound healing, maintenance of stem cell niches, beneficial regenerative effects in various diseases, and reduction of senescence. However, the mode of action in MSC-derived exosomes strongly depends on the biological content like different regulatory microRNAs that are determined by the tissue origin of MSCs. In tumors, MSCs use indirect and direct pathways in a communication network to interact with cancer cells. This leads to mutual functional changes with the acquisition of an aberrant tumor-associated MSC phenotype accompanied by altered cargo in the exosomes. Consequently, MSC-derived exosomes either from normal tissue-originating MSCs or from aberrant tumor-associated MSCs can confer different actions on tumor development. These processes exhibiting tumor-inhibitory and tumor-supportive effects with a focus on exosome microRNA content will be discriminated and discussed within this review.
Collapse
Affiliation(s)
| | | | - Ralf Hass
- Correspondence: ; Tel.: +49-511-532-6070
| |
Collapse
|
4
|
Hass R, von der Ohe J, Dittmar T. Cancer Cell Fusion and Post-Hybrid Selection Process (PHSP). Cancers (Basel) 2021; 13:cancers13184636. [PMID: 34572863 PMCID: PMC8470238 DOI: 10.3390/cancers13184636] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 09/10/2021] [Accepted: 09/10/2021] [Indexed: 12/17/2022] Open
Abstract
Fusion of cancer cells either with other cancer cells (homotypic fusion) in local vicinity of the tumor tissue or with other cell types (e.g., macrophages, cancer-associated fibroblasts (CAFs), mesenchymal stromal-/stem-like cells (MSC)) (heterotypic fusion) represents a rare event. Accordingly, the clinical relevance of cancer-cell fusion events appears questionable. However, enhanced tumor growth and/or development of certain metastases can originate from cancer-cell fusion. Formation of hybrid cells after cancer-cell fusion requires a post-hybrid selection process (PHSP) to cope with genomic instability of the parental nuclei and reorganize survival and metabolic functionality. The present review dissects mechanisms that contribute to a PHSP and resulting functional alterations of the cancer hybrids. Based upon new properties of cancer hybrid cells, the arising clinical consequences of the subsequent tumor heterogeneity after cancer-cell fusion represent a major therapeutic challenge. However, cellular partners during cancer-cell fusion such as MSC within the tumor microenvironment or MSC-derived exosomes may provide a suitable vehicle to specifically address and deliver anti-tumor cargo to cancer cells.
Collapse
Affiliation(s)
- Ralf Hass
- Biochemistry and Tumor Biology Laboratory, Department of Obstetrics and Gynecology, Hannover Medical School, 30625 Hannover, Germany;
- Correspondence: (R.H.); (T.D.); Tel.: +49-511-5326070 (R.H.); +49-2302-926165 (T.D.)
| | - Juliane von der Ohe
- Biochemistry and Tumor Biology Laboratory, Department of Obstetrics and Gynecology, Hannover Medical School, 30625 Hannover, Germany;
| | - Thomas Dittmar
- Institute of Immunology, Center of Biomedical Education and Research (ZABF), Witten/Herdecke University, 58448 Witten, Germany
- Correspondence: (R.H.); (T.D.); Tel.: +49-511-5326070 (R.H.); +49-2302-926165 (T.D.)
| |
Collapse
|
5
|
Grigoryan EN. Study of Natural Longlife Juvenility and Tissue Regeneration in Caudate Amphibians and Potential Application of Resulting Data in Biomedicine. J Dev Biol 2021; 9:2. [PMID: 33477527 PMCID: PMC7838874 DOI: 10.3390/jdb9010002] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/07/2021] [Accepted: 01/12/2021] [Indexed: 12/14/2022] Open
Abstract
The review considers the molecular, cellular, organismal, and ontogenetic properties of Urodela that exhibit the highest regenerative abilities among tetrapods. The genome specifics and the expression of genes associated with cell plasticity are analyzed. The simplification of tissue structure is shown using the examples of the sensory retina and brain in mature Urodela. Cells of these and some other tissues are ready to initiate proliferation and manifest the plasticity of their phenotype as well as the correct integration into the pre-existing or de novo forming tissue structure. Without excluding other factors that determine regeneration, the pedomorphosis and juvenile properties, identified on different levels of Urodele amphibians, are assumed to be the main explanation for their high regenerative abilities. These properties, being fundamental for tissue regeneration, have been lost by amniotes. Experiments aimed at mammalian cell rejuvenation currently use various approaches. They include, in particular, methods that use secretomes from regenerating tissues of caudate amphibians and fish for inducing regenerative responses of cells. Such an approach, along with those developed on the basis of knowledge about the molecular and genetic nature and age dependence of regeneration, may become one more step in the development of regenerative medicine.
Collapse
Affiliation(s)
- Eleonora N Grigoryan
- Kol'tsov Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia
| |
Collapse
|
6
|
Hass R, von der Ohe J, Ungefroren H. Impact of the Tumor Microenvironment on Tumor Heterogeneity and Consequences for Cancer Cell Plasticity and Stemness. Cancers (Basel) 2020; 12:cancers12123716. [PMID: 33322354 PMCID: PMC7764513 DOI: 10.3390/cancers12123716] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/08/2020] [Accepted: 12/08/2020] [Indexed: 12/13/2022] Open
Abstract
Tumor heterogeneity is considered the major cause of treatment failure in current cancer therapies. This feature of solid tumors is not only the result of clonal outgrowth of cells with genetic mutations, but also of epigenetic alterations induced by physical and chemical signals from the tumor microenvironment (TME). Besides fibroblasts, endothelial and immune cells, mesenchymal stroma/stem-like cells (MSCs) and tumor-associated macrophages (TAMs) intimately crosstalk with cancer cells and can exhibit both anti- and pro-tumorigenic effects. MSCs can alter cancer cellular phenotypes to increase cancer cell plasticity, eventually resulting in the generation of cancer stem cells (CSCs). The shift between different phenotypic states (phenotype switching) of CSCs is controlled via both genetic programs, such as epithelial-mesenchymal transdifferentiation or retrodifferentiation, and epigenetic alterations triggered by signals from the TME, like hypoxia, spatial heterogeneity or stromal cell-derived chemokines. Finally, we highlight the role of spontaneous cancer cell fusion with various types of stromal cells. i.e., MSCs in shaping CSC plasticity. A better understanding of cell plasticity and phenotype shifting in CSCs is a prerequisite for exploiting this phenomenon to reduce tumor heterogeneity, thereby improving the chance for therapy success.
Collapse
Affiliation(s)
- Ralf Hass
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, 30625 Hannover, Germany;
- Correspondence: ; Tel.: +49-511-532-6070; Fax: +49-511-532-6071
| | - Juliane von der Ohe
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, 30625 Hannover, Germany;
| | - Hendrik Ungefroren
- First Department of Medicine, University Hospital Schleswig-Holstein, Campus Lübeck, 23538 Lübeck, Germany;
- Department of General Surgery, Visceral, Thoracic, Transplantation and Pediatric Surgery, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany
| |
Collapse
|
7
|
The Intimate Relationship Among EMT, MET and TME: A T(ransdifferentiation) E(nhancing) M(ix) to Be Exploited for Therapeutic Purposes. Cancers (Basel) 2020; 12:cancers12123674. [PMID: 33297508 PMCID: PMC7762343 DOI: 10.3390/cancers12123674] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 12/03/2020] [Accepted: 12/03/2020] [Indexed: 12/12/2022] Open
Abstract
Simple Summary Intratumoral heterogeneity is considered the major cause of drug resistance and hence treatment failure in cancer patients. Tumor cells are known for their phenotypic plasticity that is the ability of a cell to reprogram and change its identity to eventually adopt multiple phenotypes. Tumor cell plasticity involves the reactivation of developmental programs, the acquisition of cancer stem cell properties and an enhanced potential for retro- or transdifferentiation. A well-known transdifferentiation mechanism is the process of epithelial-mesenchymal transition (EMT). Current evidence suggests a complex interplay between EMT, genetic and epigenetic alterations, and various signals from the tumor microenvironment (TME) in shaping a tumor cell’s plasticity. The vulnerabilities exposed by cancer cells when residing in a plastic or stem-like state have the potential to be exploited therapeutically, i.e., by converting highly metastatic cells into less aggressive or even harmless postmitotic ones. Abstract Intratumoral heterogeneity is considered the major cause of drug unresponsiveness in cancer and accumulating evidence implicates non-mutational resistance mechanisms rather than genetic mutations in its development. These non-mutational processes are largely driven by phenotypic plasticity, which is defined as the ability of a cell to reprogram and change its identity (phenotype switching). Tumor cell plasticity is characterized by the reactivation of developmental programs that are closely correlated with the acquisition of cancer stem cell properties and an enhanced potential for retrodifferentiation or transdifferentiation. A well-studied mechanism of phenotypic plasticity is the epithelial-mesenchymal transition (EMT). Current evidence suggests a complex interplay between EMT, genetic and epigenetic alterations, and clues from the tumor microenvironment in cell reprogramming. A deeper understanding of the connections between stem cell, epithelial–mesenchymal, and tumor-associated reprogramming events is crucial to develop novel therapies that mitigate cell plasticity and minimize the evolution of tumor heterogeneity, and hence drug resistance. Alternatively, vulnerabilities exposed by tumor cells when residing in a plastic or stem-like state may be exploited therapeutically, i.e., by converting them into less aggressive or even postmitotic cells. Tumor cell plasticity thus presents a new paradigm for understanding a cancer’s resistance to therapy and deciphering its underlying mechanisms.
Collapse
|
8
|
Altered Tumor Plasticity after Different Cancer Cell Fusions with MSC. Int J Mol Sci 2020; 21:ijms21218347. [PMID: 33172211 PMCID: PMC7664391 DOI: 10.3390/ijms21218347] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 10/30/2020] [Accepted: 11/02/2020] [Indexed: 12/16/2022] Open
Abstract
While cell fusion demonstrates an important pathway during tissue development and regeneration of distinct organs, this process can also contribute to pathophysiological phenotypes during tumor progression. Hybrid cell formation after heterofusion between cancer cells and various other cell types within the tumor microenvironment is observed in vitro and in vivo. In particular, mesenchymal stroma/stem-like cells (MSC) perform diverse levels of communication with cancer cells by exhibiting anti- and pro-tumorigenic effects. During these cellular interactions, MSC can eventually fuse with cancer cells. Thereby, the newly generated disparate hybrid populations display aneuploidy associated with chromosomal instability. Based upon a subsequent post-hybrid selection process (PHSP), fused cancer cells can undergo apoptosis/necroptosis, senescence, dormancy, or a proliferative state by acquisition of new properties. Consequently, PHSP-surviving hybrid cancer cells demonstrate altered functionalities within the tumor tissue. This is accompanied by changes in therapeutic responsiveness and a different metastatic behavior. Accordingly, enhanced tumor plasticity interferes with successful therapeutic interventions and aggravates patient prognoses. The present review article focusses on fusion of MSC with different human cancer cells, in particular breast cancer populations and resulting characteristics of various cancer hybrid cells. Moreover, some mechanisms of cancer cell fusion are discussed together with multiple PHSP pathways.
Collapse
|
9
|
Role of MSC in the Tumor Microenvironment. Cancers (Basel) 2020; 12:cancers12082107. [PMID: 32751163 PMCID: PMC7464647 DOI: 10.3390/cancers12082107] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/24/2020] [Accepted: 07/25/2020] [Indexed: 12/24/2022] Open
Abstract
The tumor microenvironment represents a dynamically composed matrix in which tissue-associated cancer cells are embedded together with a variety of further cell types to form a more or less separate organ-like structure. Constantly mutual interactions between cells of the tumor microenvironment promote continuous restructuring and growth in the tumor. A distinct organization of the tumor stroma also facilitates the formation of transient cancer stem cell niches, thereby contributing to progressive and dynamic tumor development. An important but heterogeneous mixture of cells that communicates among the cancer cells and the different tumor-associated cell types is represented by mesenchymal stroma-/stem-like cells (MSC). Following recruitment to tumor sites, MSC can change their functionalities, adapt to the tumor's metabolism, undergo differentiation and synergize with cancer cells. Vice versa, cancer cells can alter therapeutic sensitivities and change metastatic behavior depending on the type and intensity of this MSC crosstalk. Thus, close cellular interactions between MSC and cancer cells can eventually promote cell fusion by forming new cancer hybrid cells. Consequently, newly acquired cancer cell functions or new hybrid cancer populations enlarge the plasticity of the tumor and counteract successful interventional strategies. The present review article highlights some important features of MSC within the tumor stroma.
Collapse
|
10
|
Hass R, von der Ohe J, Ungefroren H. Potential Role of MSC/Cancer Cell Fusion and EMT for Breast Cancer Stem Cell Formation. Cancers (Basel) 2019; 11:cancers11101432. [PMID: 31557960 PMCID: PMC6826868 DOI: 10.3390/cancers11101432] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 09/20/2019] [Accepted: 09/24/2019] [Indexed: 02/06/2023] Open
Abstract
Solid tumors comprise of maturated cancer cells and self-renewing cancer stem-like cells (CSCs), which are associated with various other nontumorigenic cell populations in the tumor microenvironment. In addition to immune cells, endothelial cells, fibroblasts, and further cell types, mesenchymal stroma/stem-like cells (MSC) represent an important cell population recruited to tumor sites and predominantly interacting with the different cancer cells. Breast cancer models were among the first to reveal distinct properties of CSCs, however, the cellular process(es) through which these cells are generated, maintained, and expanded within neoplastic tissues remains incompletely understood. Here, we discuss several possible scenarios that are not mutually exclusive but may even act synergistically: fusion of cancer cells with MSC to yield hybrid cells and/or the induction of epithelial-mesenchymal transition (EMT) in breast cancer cells by MSC, which can relay signals for retrodifferentiation and eventually, the generation of breast CSCs (BCSCs). In either case, the consequences may be promotion of self-renewal capacity, tumor cell plasticity and heterogeneity, an increase in the cancer cells’ invasive and metastatic potential, and the acquisition of resistance mechanisms towards chemo- or radiotherapy. While specific signaling mechanisms involved in each of these properties remain to be elucidated, the present review article focusses on a potential involvement of cancer cell fusion and EMT in the development of breast cancer stem cells.
Collapse
Affiliation(s)
- Ralf Hass
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, 30625 Hannover, Germany.
| | - Juliane von der Ohe
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, 30625 Hannover, Germany.
| | - Hendrik Ungefroren
- First Department of Medicine, University Hospital Schleswig-Holstein, Campus Lübeck, 23538 Lübeck, Germany.
- Department of General Surgery, Visceral, Thoracic, Transplantation and Pediatric Surgery, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany.
| |
Collapse
|
11
|
Li W, Han Y, Zhao Z, Ji X, Wang X, Jin J, Wang Q, Guo X, Cheng Z, Lu M, Wang G, Wang Y, Liu H. Oral mucosal mesenchymal stem cell‑derived exosomes: A potential therapeutic target in oral premalignant lesions. Int J Oncol 2019; 54:1567-1578. [PMID: 30896790 PMCID: PMC6438436 DOI: 10.3892/ijo.2019.4756] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 01/23/2019] [Indexed: 02/07/2023] Open
Abstract
Emerging evidence indicates that mesenchymal stem cells (MSCs) serve an indispensable role in the tumor microenvironment. However, whether MSCs participate in the development of oral carcinogenesis remains unclear. The present study isolated MSCs from clinical tissues and investigated the differences of MSCs derived from normal oral mucosa (N-MSC), oral leukoplakia with dysplasia (LK-MSC) and oral carcinoma (Ca-MSC). The results revealed that the LK-MSCs exhibited reduced proliferation and migration, compared with the N-MSCs and Ca-MSCs. Furthermore, it was demonstrated that the exosomes secreted by LK-MSCs have significant roles in promoting proliferation, migration and invasion in vitro, which was similar to the Ca-MSC-derived exosomes. The promoting effect was also demonstrated in a 3D coculture model. When the secretion of exosomes was blocked, the promoting effect of LK-MSCs was reversed. Based on a microarray analysis of MSC-derived exosomes, microRNA-8485 (miR-8485) was identified to be ectopically expressed. The exosomal miR-8485 was capable of promoting the proliferation, migration and invasion of tumor cells. Therefore, the present study highlights the significance of MSC-derived exosomes and exosomal miR-8485 in premalignant lesions and carcinogenesis. Intervention with the secretion of MSC-derived-exosomes may be an innovative strategy to retard the carcinogenesis.
Collapse
Affiliation(s)
- Wenwen Li
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Ying Han
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Zhongfang Zhao
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Xiaoli Ji
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Xing Wang
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Jianqiu Jin
- Department of Stomatology, Beijing Hospital, Beijing 100730, P.R. China
| | - Qian Wang
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Xiang Guo
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Zhe Cheng
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Mingxing Lu
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Guodong Wang
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Yixiang Wang
- Department of Central Laboratory, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| | - Hongwei Liu
- Department of Oral Medicine, Peking University School and Hospital of Stomatology, Beijing 100081, P.R. China
| |
Collapse
|
12
|
Melzer C, von der Ohe J, Hass R. Concise Review: Crosstalk of Mesenchymal Stroma/Stem-Like Cells with Cancer Cells Provides Therapeutic Potential. Stem Cells 2018; 36:951-968. [PMID: 29603861 DOI: 10.1002/stem.2829] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 02/26/2018] [Accepted: 03/19/2018] [Indexed: 12/21/2022]
Abstract
Various direct and indirect cellular interactions between multi-functional mesenchymal stroma/stem-like cells (MSCs) and cancer cells contribute to increasing plasticity within the tumor tissue and its microenvironment. Direct and tight communication between MSC and cancer cells is based on membrane protein interactions and the exchange of large plasma membrane fragments also known as trogocytosis. An ultimate but rare direct interaction resumes in fusion of these two cellular partners resulting in the formation of new cancer hybrid cell populations. Alternatively, indirect interactions are displayed by the release of membranous vesicle-encapsulated microRNAs and proteins or soluble components such as molecular growth factors, hormones, chemo-/cytokines, and metabolites. Released single molecules as well as multivesicular bodies including exosomes and microvesicles can form local concentration gradients within the tumor microenvironment and are incorporated not only by adjacent neighboring cells but also affect distant target cells. The present Review will focus on vesicle-mediated indirect communication and on cancer cell fusion with direct contact between MSC and cancer cells. These different types of interaction are accompanied by functional interference and mutual acquisition of new cellular properties. Consequently, alterations in cancer cell functionalities paralleled by the capability to reorganize the tumor stroma can trigger changes in metastatic behavior and promote retrodifferentiation to develop new cancer stem-like cells. However, exosomes and microvesicles acting over long distances may also provide a tool with therapeutic potential when loaded with anti-tumor cargo. Stem Cells 2018;36:951-968.
Collapse
Affiliation(s)
- Catharina Melzer
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, Hannover, Germany
| | - Juliane von der Ohe
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, Hannover, Germany
| | - Ralf Hass
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, Hannover, Germany
| |
Collapse
|
13
|
Cancer stem cell niche models and contribution by mesenchymal stroma/stem cells. Mol Cancer 2017; 16:28. [PMID: 28148265 PMCID: PMC5286787 DOI: 10.1186/s12943-017-0595-x] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 01/18/2017] [Indexed: 02/08/2023] Open
Abstract
Background The initiation and progression of malignant tumors is driven by distinct subsets of tumor-initiating or cancer stem-like cells (CSCs) which develop therapy/apoptosis resistance and self-renewal capacity. In order to be able to eradicate these CSCs with novel classes of anti-cancer therapeutics, a better understanding of their biology and clinically-relevant traits is mandatory. Main body Several requirements and functions of a CSC niche physiology are combined with current concepts for CSC generation such as development in a hierarchical tumor model, by stochastic processes, or via a retrodifferentiation program. Moreover, progressive adaptation of endothelial cells and recruited immune and stromal cells to the tumor site substantially contribute to generate a tumor growth-permissive environment resembling a CSC niche. Particular emphasis is put on the pivotal role of multipotent mesenchymal stroma/stem cells (MSCs) in supporting CSC development by various kinds of interaction and cell fusion to form hybrid tumor cells. Conclusion A better knowledge of CSC niche physiology may increase the chances that cancer stemness-depleting interventions ultimately result in arrest of tumor growth and metastasis.
Collapse
|
14
|
Melzer C, Yang Y, Hass R. Interaction of MSC with tumor cells. Cell Commun Signal 2016; 14:20. [PMID: 27608835 PMCID: PMC5016940 DOI: 10.1186/s12964-016-0143-0] [Citation(s) in RCA: 145] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 09/02/2016] [Indexed: 02/06/2023] Open
Abstract
Tumor development and tumor progression is not only determined by the corresponding tumor cells but also by the tumor microenvironment. This includes an orchestrated network of interacting cell types (e.g. immune cells, endothelial cells, fibroblasts, and mesenchymal stroma/stem cells (MSC)) via the extracellular matrix and soluble factors such as cytokines, chemokines, growth factors and various metabolites. Cell populations of the tumor microenvironment can interact directly and indirectly with cancer cells by mutually altering properties and functions of the involved partners. Particularly, mesenchymal stroma/stem cells (MSC) play an important role during carcinogenesis exhibiting different types of intercellular communication. Accordingly, this work focusses on diverse mechanisms of interaction between MSC and cancer cells. Moreover, some functional changes and consequences for both cell types are summarized which can eventually result in the establishment of a carcinoma stem cell niche (CSCN) or the generation of new tumor cell populations by MSC-tumor cell fusion.
Collapse
Affiliation(s)
- Catharina Melzer
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, Carl-Neuberg-Str. 1, D, 30625, Hannover, Germany
| | - Yuanyuan Yang
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, Carl-Neuberg-Str. 1, D, 30625, Hannover, Germany.,Tongji Hospital Affiliated Tongji University, Shanghai, China
| | - Ralf Hass
- Biochemistry and Tumor Biology Lab, Department of Obstetrics and Gynecology, Hannover Medical School, Carl-Neuberg-Str. 1, D, 30625, Hannover, Germany.
| |
Collapse
|
15
|
Hass R, Otte A. Mesenchymal stem cells as all-round supporters in a normal and neoplastic microenvironment. Cell Commun Signal 2012; 10:26. [PMID: 22943670 PMCID: PMC3444900 DOI: 10.1186/1478-811x-10-26] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 08/28/2012] [Indexed: 02/07/2023] Open
Abstract
Mesenchymal stem cells (MSC) represent a heterogeneous population exhibiting stem cell-like properties which are distributed almost ubiquitously among perivascular niches of various human tissues and organs. Organismal requirements such as tissue damage determine interdisciplinary functions of resident MSC including self-renewal, migration and differentiation, whereby MSC support local tissue repair, angiogenesis and concomitant immunomodulation. However, growth of tumor cells and invasion also causes local tissue damage and injury which subsequently activates repair mechanisms and consequently, attracts MSC. Thereby, MSC exhibit a tissue-specific functional biodiversity which is mediated by direct cell-to-cell communication via adhesion molecule signaling and by a tightly regulated exchange of a multifactorial panel of cytokines, exosomes, and micro RNAs. Such interactions determine either tumor-promoting or tumor-inhibitory support by MSC. Moreover, fusion with necrotic/apoptotic tumor cell bodies contributes to re-program MSC into an aberrant phenotype also suggesting that tumor tissue in general represents different types of neoplastic cell populations including tumor-associated stem cell-like cells. The present work summarizes some functional characteristics and biodiversity of MSC and highlights certain controversial interactions with normal and tumorigenic cell populations, including associated modulations within the MSC microenvironment.
Collapse
Affiliation(s)
- Ralf Hass
- Biochemistry and Tumor Biology Lab, Gynecology Research Unit, Department of Obstetrics and Gynecology (OE 6410), Medical University Hannover, Carl-Neuberg-Str, 1, 30625 Hannover, Germany.
| | | |
Collapse
|
16
|
Mandel K, Otte A, Hass R. Involvement of CD11b integrin in the alteration of metabolic factors after phorbol ester stimulation of human myeloid leukemia cells. Cell Commun Signal 2012; 10:13. [PMID: 22607136 PMCID: PMC3394204 DOI: 10.1186/1478-811x-10-13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 05/20/2012] [Indexed: 11/23/2022] Open
Abstract
Previous work has demonstrated that phorbol ester (TPA)-induced adherence of human U937 myeloid leukemia cells can be blocked upon down-modulation of the β2-integrin CD11b after stable transfection of U937 cells with a pMTH1 vector-containing the CD11b gene in antisense orientation (asCD11b-U937) [Otte et al., (2011)]. In the present study, alterations in metabolism-associated factors, particularly intra- and extracellular proteases were investigated. A measurement of telomerase activity in the leukemic cells revealed continuously decreasing telomere adducts within 72 h of TPA treatment in pMTH1-U937 cells. In contrast, telomerase activity sustained in asCD11b-U937 upon TPA-induced differentiation. Flow cytometric analysis confirmed unchanged CD11b levels in TPA-induced asCD11b-U937 in contrast to elevated levels in pMTH1-U937 whereby the expression of other β2-integrins including CD11a, CD11c and CD18 was increased in both populations after TPA treatment. Moreover, adherent pMTH1-U937 demonstrated the expression of monocytic differentiation markers including F4-80 and CD14 and an increased MIP-1α production which remained at low or undetectable in TPA-induced asCD11b-U937. These effects indicated an altered response of the different cell populations to the TPA-induced differentiation process. Indeed, Western blot analysis revealed differences in the expression levels of intracellular metabolic factors including MnSOD and p97/VCP and after measurement of 20 S proteasomal proteolytic activity. In addition, increased levels of extracellular metabolic factors including the matrix metalloproteinases MMP-1, MMP-7 and MMP-9 were observed in pMTH1-U937 cells in contrast to unaltered levels in asCD11b-U937 cells.
Collapse
Affiliation(s)
- Katharina Mandel
- Biochemistry and Tumor Biology Lab, Gynecology Research Unit, Department of Obstetrics and Gynecology, Medical University, Hannover, Germany.
| | | | | |
Collapse
|
17
|
Black J, Coffin CM, Dehner LP. Fibrohistiocytic tumors and related neoplasms in children and adolescents. Pediatr Dev Pathol 2012; 15:181-210. [PMID: 22420728 DOI: 10.2350/11-03-1001-pb.1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fibrohistiocytic tumors (FHTs) in children and adolescents range from the benign fibrous histiocytoma, or dermatofibroma, to a variety of intermediate and malignant neoplasms, such as dermatofibrosarcoma protruberans and high-grade undifferentiated pleomorphic sarcoma (malignant fibrous histiocytoma). Those tumors as a group are comprised of fibroblasts, myofibroblasts, and histiocytes-dendritic cells with a variably prominent inflammatory infiltrate consisting of lymphocytes and eosinophils. Dendritic cells are also a major constituent of another group of neoplasms that include Langerhans cell histiocytosis, follicular and interdigitating cell sarcomas, and juvenile xanthogranuloma. These latter tumors are considered in this discussion for the sake of differential diagnosis and their possible histogenetic relationship to FHTs. Recent studies have suggested that the relationship between the fibroblast and histiocyte in the FHTs may reflect the intrinsic capacity to transdifferentiate from one to the other morphologic and functional state. The so-called "facultative fibroblast," as a cell with fibroblastic and histiocytic properties, was discussed in the context of the fibrous xanthoma 50 years ago. Possibly the entire histogenetic concept of FHTs should be reconsidered in light of current studies.
Collapse
Affiliation(s)
- Jennifer Black
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University, Nashville, TN, USA.
| | | | | |
Collapse
|
18
|
Otte A, Mandel K, Reinstrom G, Hass R. Abolished adherence alters signaling pathways in phorbol ester-induced human U937 cells. Cell Commun Signal 2011; 9:20. [PMID: 21939515 PMCID: PMC3191470 DOI: 10.1186/1478-811x-9-20] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 09/22/2011] [Indexed: 12/24/2022] Open
Abstract
Phorbol ester (TPA) treatment of human U937 myeloid leukemia cells is associated with increasing adherence and monocyte-like maturation whereby the role of β2 integrin-mediated attachment for subsequent growth properties and the differentiation program remains unclear. Here, stably-transfected U937 cells with a pMTH1 vector containing the β2 integrin gene of CD11b in antisense orientation (asCD11b-U937) demonstrated a significantly reduced proliferative capacity in contrast to control vector transfectants (pMTH1-U937) or wild-type U937 cells. Phorbol ester exposure induced adherence and growth arrest in more than 90% of pMTH1-U937 and wild-type U937 cells after 72 h. In contrast, TPA-treated asCD11b-U937 failed to attach and the proliferation continued in more than 30% of the cells. Moreover, increased apoptosis appeared in asCD11b-U937 after TPA induction in contrast to pMTH1-U937 cells. In addition, non-specific inhibition of adherence on an agarose surface demonstrated internucleosomal DNA fragmentation in both, pMTH1-U937 and asCD11b-U937 after TPA treatment indicating a functional relationship between abolished adherence, regulation of proliferation and induction of apoptosis. Western blot analysis revealed differences in the expression levels and altered phosphorylation patterns of Pyk-2, pp60src and p42/p44 MAP kinases between pMTH1-U937 and asCD11b-U937 following TPA exposure which was also substantiated by Pyk-2 immunoprecipitation. These findings suggested that induced adherence predominantly mediated by a functional CD11b/CD18 integrin in U937 cells is involved in the activation of downstream signaling kinases and contributes to cell cycle regulation and apoptosis during monocytic maturation.
Collapse
Affiliation(s)
- Anna Otte
- Biochemistry and Tumor Biology Lab, Gynecology Research Unit, Dept, of Gynecology and Obstetrics, Medical University, Hannover, Germany.
| | | | | | | |
Collapse
|
19
|
Hass R, Kasper C, Böhm S, Jacobs R. Different populations and sources of human mesenchymal stem cells (MSC): A comparison of adult and neonatal tissue-derived MSC. Cell Commun Signal 2011; 9:12. [PMID: 21569606 PMCID: PMC3117820 DOI: 10.1186/1478-811x-9-12] [Citation(s) in RCA: 1158] [Impact Index Per Article: 89.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Accepted: 05/14/2011] [Indexed: 12/11/2022] Open
Abstract
The mesenchymal stroma harbors an important population of cells that possess stem cell-like characteristics including self renewal and differentiation capacities and can be derived from a variety of different sources. These multipotent mesenchymal stem cells (MSC) can be found in nearly all tissues and are mostly located in perivascular niches. MSC have migratory abilities and can secrete protective factors and act as a primary matrix for tissue regeneration during inflammation, tissue injuries and certain cancers.These functions underlie the important physiological roles of MSC and underscore a significant potential for the clinical use of distinct populations from the various tissues. MSC derived from different adult (adipose tissue, peripheral blood, bone marrow) and neonatal tissues (particular parts of the placenta and umbilical cord) are therefore compared in this mini-review with respect to their cell biological properties, surface marker expression and proliferative capacities. In addition, several MSC functions including in vitro and in vivo differentiation capacities within a variety of lineages and immune-modulatory properties are highlighted. Differences in the extracellular milieu such as the presence of interacting neighbouring cell populations, exposure to proteases or a hypoxic microenvironment contribute to functional developments within MSC populations originating from different tissues, and intracellular conditions such as the expression levels of certain micro RNAs can additionally balance MSC function and fate.
Collapse
Affiliation(s)
- Ralf Hass
- Laboratory of Biochemistry and Tumor Biology, Gynecology Research Unit, Department of Obstetrics and Gynecology, Medical University, Hannover, Carl-Neuberg-Straße 1, 30625 Hannover, Germany.
| | | | | | | |
Collapse
|
20
|
Chaturvedi S, Hass R. Extracellular signals in young and aging breast epithelial cells and possible connections to age-associated breast cancer development. Mech Ageing Dev 2011; 132:213-9. [PMID: 21507328 DOI: 10.1016/j.mad.2011.04.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Revised: 02/07/2011] [Accepted: 04/02/2011] [Indexed: 12/28/2022]
Abstract
Aging of human breast tissue is accompanied by certain structural and functional variations and several studies suggest a possible contribution of these changes to an aging-related breast cancer development. At the cellular level, aging of human mammary epithelial cells is associated with significant morphological and functional alterations such as an increased cell size and a reduced proliferation. Cellular senescence of HMEC cannot be explained by a single mechanism but represents an interaction of numerous extra- and intracellular events and the complexity of such orchestrating pathways is still hardly understood. Besides the contribution of reactive oxygen species and telomere dysfunction to aging, it is the aim of this mini-review, to compare distinct changes to extracellular signals by certain matrix metalloproteinases including MMP-7 and associated growth factor pathways mediated by HB-EGF activation in young and aging HMEC. Such changes can alter hormone receptor levels within aged HMEC, induce tissue fibrosis and promote epithelial-to-mesenchymal transition as a potential prerequisite for breast cancer development. Moreover, an accumulation of aging cells during the normal life span of the breast tissue may also substantially effect and interact with adjacent neighboring populations in the local microenvironment to provide optimized growth conditions which would also support neoplastic cells.
Collapse
Affiliation(s)
- Sukhada Chaturvedi
- Department of Gynecology, Biochemistry and Tumor Biology Lab (OE 6411), Medical School Hannover, Germany.
| | | |
Collapse
|
21
|
Lavrentieva A, Majore I, Kasper C, Hass R. Effects of hypoxic culture conditions on umbilical cord-derived human mesenchymal stem cells. Cell Commun Signal 2010; 8:18. [PMID: 20637101 PMCID: PMC2918620 DOI: 10.1186/1478-811x-8-18] [Citation(s) in RCA: 162] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 07/16/2010] [Indexed: 11/24/2022] Open
Abstract
Following cultivation of distinct mesenchymal stem cell (MSC) populations derived from human umbilical cord under hypoxic conditions (between 1.5% to 5% oxygen (O2)) revealed a 2- to 3-fold reduced oxygen consumption rate as compared to the same cultures at normoxic oxygen levels (21% O2). A simultaneous measurement of dissolved oxygen within the culture media from 4 different MSC donors ranged from 15 μmol/L at 1.5% O2 to 196 μmol/L at normoxic 21% O2. The proliferative capacity of the different hypoxic MSC populations was elevated as compared to the normoxic culture. This effect was paralleled by a significantly reduced cell damage or cell death under hypoxic conditions as evaluated by the cellular release of LDH whereby the measurement of caspase3/7 activity revealed little if any differences in apoptotic cell death between the various cultures. The MSC culture under hypoxic conditions was associated with the induction of hypoxia-inducing factor-alpha (HIF-1α) and an elevated expression of energy metabolism-associated genes including GLUT-1, LDH and PDK1. Concomitantly, a significantly enhanced glucose consumption and a corresponding lactate production could be observed in the hypoxic MSC cultures suggesting an altered metabolism of these human stem cells within the hypoxic environment.
Collapse
Affiliation(s)
- Antonina Lavrentieva
- Institut für Technische Chemie, Leibniz Universität Hannover, Callinstrasse 5, 30167 Hannover, Germany.
| | | | | | | |
Collapse
|
22
|
Zheng PP, Kros JM. Challenge of the gap between the current mania of cancer stem cells and the therapeutic strategy for patients with cancer. Int J Cancer 2010; 126:1529-30. [PMID: 19711343 DOI: 10.1002/ijc.24863] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
23
|
Hass R. Rejuvenation in distinct cell populations - What does it mean? Exp Gerontol 2009; 44:634-8. [PMID: 19638307 DOI: 10.1016/j.exger.2009.07.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Revised: 07/20/2009] [Accepted: 07/22/2009] [Indexed: 11/29/2022]
Abstract
Rejuvenation represents a well organized and tightly regulated cellular process in vitro and in vivo, whereby senescent and/or certain differentiated cells revert specific properties acquired during previous steps of maturation to restore again a younger phenotype. Effects of the microenvironment and cellular mechanisms including asymmetric mitosis or retrodifferentiation can contribute to rejuvenation during a dynamic cellular development in contrast to terminally differentiated cells like unicellular organisms, which appear unable to retrodifferentiate and to rejuvenate. The process of rejuvenation is observed in distinct cell populations and includes a coordinated multistep network of transduction cascades with extracellular signaling and cell-to-cell communication to relay intracellular pathways. This provides a certain tissue homeostasis by a regenerative potential and renewal upon tissue-specific repair requirements in addition to residual stem cells, which can vary among different organs and species to extend their life span. However, dysfunctions within a rejuvenation program may also include the risk of neoplastic growth during such a retrograde development. In contrast to rejuvenation in certain cell types, a life span extension - also termed longevity - does not represent a retrograde development but an overall prolonged function of tissues, organs and/or whole organisms. Thus, rejuvenation of a distinct cell population could contribute to longevity of the corresponding organism but may not necessarily be required since longevity could also be achieved mechanistically by inhibition of the mTOR-mediated signaling pathway or by sufficient supply of anti-oxidative defence compounds, physiologically by nutrient restrictions, genetically by the induction of longevity genes or environmentally by the inhibition of aging.
Collapse
Affiliation(s)
- Ralf Hass
- Clinic of Obstetrics and Gynecology, Medical University Hannover, Germany.
| |
Collapse
|