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Matsumoto T, Mukohara A. Effects of Whole-Body Vibration on Breast Cancer Bone Metastasis and Vascularization in Mice. Calcif Tissue Int 2022; 111:535-545. [PMID: 35896728 DOI: 10.1007/s00223-022-01009-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 07/07/2022] [Indexed: 11/12/2022]
Abstract
We evaluated whether whole-body vibration (WBV) prevented bone loss induced by breast cancer (BC) metastasis and the involvement of bone marrow vasculature. One day after orthotopic transplantation of mammary 4T1 tumor cells, 8-week-old BALB/c mice were subjected to 0.3 g/90 Hz vertical vibration for 20 min/day for 5 days/week (BC-WBV) or sham-handled (BC-Sham) over 3 weeks. Age-matched intact mice (Intact) were also sham-handled. Both tibiae were harvested from BC-WBV (n = 7), BC-Sham (n = 9), and Intact (n = 5) mice for bone structure imaging by synchrotron radiation-based computed tomography (SRCT) and hematoxylin and eosin staining, whereas right tibiae were harvested from other BC-WBV and BC-Sham (n = 6 each) mice for vascular imaging by SRCT. Tumor cells were similarly widespread in the marrow in BC-WBV and BC-Sham mice. In BC-Sham mice, cortical bone volume, trabecular volume fraction, trabecular thickness, trabecular number density, and bone mineral density were smaller, and marrow volume and trabecular separation were larger than in Intact mice. However, although trabecular thickness was smaller in BC-WBV than Intact mice, the others did not differ between the two groups. Serum osteocalcin tended to be higher in BC-WBV than BC-Sham mice. Compared with BC-Sham mice, BC-WBV mice had a smaller vessel diameter, a trend of a larger vessel number density, and smaller vessel diameter heterogeneity. In conclusion, WBV mitigates bone loss in BC bone metastasis, which may be partly due to increased bone anabolism. The alteration of marrow vasculature appears to be favorable for anti-tumor drug delivery. Further studies are needed to clarify the multiple actions of WBV on bone, tumor, and marrow vasculature and how they contribute to bone protection in BC metastasis.
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Affiliation(s)
- Takeshi Matsumoto
- Biomedical Engineering Laboratory, Tokushima University Graduate School of Technology, Industrial and Social Sciences, 770-8506, Tokushima, Japan.
| | - Akihiro Mukohara
- Biomedical Engineering Laboratory, Tokushima University Faculty of Science and Technology, 770-8506, Tokushima, Japan
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Schroeder M, Viezens L, Sündermann J, Hettenhausen S, Hauenherm G, Wellbrock J, Mussawy H, Kossow K, Schaefer C. Preclinical Quantification of Prostate Cancer-Associated Vascular Alterations in the Bone Microenvironment in vivo. Eur Surg Res 2021; 61:188-200. [PMID: 33626542 DOI: 10.1159/000514224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 01/04/2021] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Prostate cancer has a special predilection to form bone metastases. Despite the known impact of the microvascular network on tumour growth and its dependence on the organ-specific microenvironment, the characteristics of the tumour vasculature in bone remain unknown. METHODS The cell lines LNCaP, DU145, and PC3 were implanted into the femurs of NSG mice to examine the microvascular properties of prostate cancer in bone. Tumour growth and the functional and morphological alterations of the microvasculature were analysed for 21 days in vivo using a transparent bone chamber and fluorescence microscopy. RESULTS Vascular density was significantly lower in tumour-bearing bone than in non-tumour-bearing bone, with a marked loss of small vessels. Accelerated blood flow velocity led to increased volumetric blood flow per vessel, but overall perfusion was not affected. All of the prostate cancer cell lines had similar vascular patterns, with more pronounced alterations in rapidly growing tumours. Despite minor differences between the prostate cancer cell lines associated with individual growth behaviours, the same overall pattern was observed and showed strong similarity to that of tumours growing in soft tissue. DISCUSSION The increase in blood flow velocity could be a specific characteristic of prostate cancer or the bone microenvironment.
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Affiliation(s)
- Malte Schroeder
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany, .,Department of Spine Surgery, Klinikum Bad Bramstedt, Bad Bramstedt, Germany,
| | - Lennart Viezens
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Trauma, Hand and Reconstructive Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jördis Sündermann
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Svenja Hettenhausen
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Gerrit Hauenherm
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jasmin Wellbrock
- Department of Haematology, Oncology and Stem Cell Transplantation with Section Pneumology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Haider Mussawy
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kai Kossow
- Centre of Psychosocial Medicine, Institute and Policlinics of Medical Psychology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Schaefer
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Spine Surgery, Klinikum Bad Bramstedt, Bad Bramstedt, Germany
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Mussawy H, Viezens L, Schroeder M, Hettenhausen S, Sündermann J, Wellbrock J, Kossow K, Schaefer C. The bone microenvironment promotes tumor growth and tissue perfusion compared with striated muscle in a preclinical model of prostate cancer in vivo. BMC Cancer 2018; 18:979. [PMID: 30326868 PMCID: PMC6192198 DOI: 10.1186/s12885-018-4905-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 10/05/2018] [Indexed: 12/21/2022] Open
Abstract
Background Prostate cancer-related morbidity is associated with its preferential spread to the bone. Although the molecular interactions between the bone microenvironment and cancer cells have been researched extensively, the relevance of the microvascular properties of prostate cancer bone metastases remains largely unknown. Most preclinical studies focusing on microvascular analyses are based on heterotopic tumor implantation, whereas the impact of the microenvironment on site-specific growth behavior and angiogenesis is rarely addressed. Methods The microvascular changes associated with tumor growth in bone and soft tissue were characterized by implanting single cell suspensions of LnCap, Du145, and Pc3 cells into the femur (femur window) or striated muscle (dorsal skinfold chamber) of NSG mice. Tumor growth and the local microvasculature were analyzed for 21 days using intravital fluorescence microscopy. Results The results showed a higher engraftment of tumor cells in bone than in striated muscle associated with accelerated growth of LnCap cells and Pc3 cells. Permeability, blood flow, and tissue perfusion rates were greater in bone than in striated muscle. Du145 cells showed similar growth behavior in both tissues with similar vascular properties. The bone microenvironment facilitated tumor engraftment and growth. Increased microvascular density in striated muscle led to a higher tumor burden during early growth, whereas the increased perfusion promoted later prostate cancer growth in bone. Conclusions Monitoring prostate cancer microcirculation in bone and soft tissue may be useful to evaluate the organ-specific efficacy of new treatments. Electronic supplementary material The online version of this article (10.1186/s12885-018-4905-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Haider Mussawy
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany.
| | - Lennart Viezens
- Department of Trauma, Orthopaedic, and Plastic Surgery, University Medical Center Goettingen, Goettingen, Germany
| | - Malte Schroeder
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany.,Department of Spine Surgery, Klinikum Bad Bramstedt, 24576, Bad Bramstedt, Germany
| | - Svenja Hettenhausen
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Jördis Sündermann
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Jasmin Wellbrock
- Department of Hematology, Oncology and Stem Cell Transplantation with Section Pneumology, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Kai Kossow
- Center of Psychosocial Medicine, Institute and Policlinics of Medical Psychology, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany
| | - Christian Schaefer
- Department of Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, 20246, Hamburg, Germany.,Department of Spine Surgery, Klinikum Bad Bramstedt, 24576, Bad Bramstedt, Germany
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Mussawy H, Viezens L, Hauenherm G, Schroeder M, Schaefer C. In vivo functional and morphological characterization of bone and striated muscle microcirculation in NSG mice. PLoS One 2017; 12:e0183186. [PMID: 28800593 PMCID: PMC5553939 DOI: 10.1371/journal.pone.0183186] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Accepted: 07/30/2017] [Indexed: 11/18/2022] Open
Abstract
Organ-specific microcirculation plays a central role in tumor growth, tumor cell homing, tissue engineering, and wound healing. Mouse models are widely used to study these processes; however, these mouse strains often possess unique microhemodynamic parameters, making it difficult to directly compare experiments. The full functional characterization of bone and striated muscle microcirculatory parameters in non-obese diabetic-severe combined immunodeficiency/y-chain; NOD-Prkds IL2rg (NSG) mice has not yet been reported. Here, we established either a dorsal skinfold chamber or femur window in NSG mice (n = 23), allowing direct analysis of microcirculatory parameters in vivo by intravital fluorescence microscopy at 7, 14, 21, and 28 days after chamber preparation. Organ-specific differences were observed. Bone had a significantly lower vessel density but a higher vessel diameter than striated muscle. Bone also showed higher effective vascular permeability than striated muscle. The centerline velocity values were similar in the femur window and dorsal skinfold chamber, with a higher volumetric blood flow in bone. Interestingly, bone and striated muscle showed similar tissue perfusion rates. Knowledge of physiological microhemodynamic values of bone and striated muscle in NSG mice makes it possible to analyze pathophysiological processes at these anatomic sites, such as tumor growth, tumor metastasis, and tumor microcirculation, as well as the response to therapeutic agents.
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Affiliation(s)
- Haider Mussawy
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- * E-mail:
| | - Lennart Viezens
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- Department of Trauma-, Hand-, and Reconstructive Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Gerrit Hauenherm
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Malte Schroeder
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- Department of Spine Surgery, Klinikum Bad Bramstedt, Bad Bramstedt, Germany
| | - Christian Schaefer
- Department of Orthopaedic Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
- Department of Spine Surgery, Klinikum Bad Bramstedt, Bad Bramstedt, Germany
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Kim J, Kim DH, Jung SJ, Gil HJ, Yoon SZ, Kim YI, Soh KS. Monitoring the primo vascular system in lymphatic vessels by using window chambers. BIOMEDICAL OPTICS EXPRESS 2016; 7:1251-1259. [PMID: 27446651 PMCID: PMC4929637 DOI: 10.1364/boe.7.001251] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 01/28/2016] [Accepted: 03/08/2016] [Indexed: 06/06/2023]
Abstract
This study aims to develop a window chamber system in the skin of rats and to monitor the primo vascular system (PVS) inside the lymphatic vessels along the superficial epigastric vessels. The PVS in lymphatic vessels has been observed through many experiments under in vivo conditions, but monitoring the in vivo PVS in situ inside lymphatic vessels for a long time is difficult. To overcome the obstacles, we adapted the window chamber system for monitoring the PVS and Alcian blue (AB) staining dye solution for the contrast agent. The lymphatic vessels in the skin on the lateral side of the body, connecting the inguinal lymph nodes to the axillary lymph nodes, were the targets for setting the window system. After AB had been injected into the inguinal lymph nodes with a glass capillary, the morphological changes of the stained PVS were monitored through the window system for up to twenty hours, and the changes in the AB intensity in the PVS were quantified by using image processing. The results and histological images are presented in this study.
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Affiliation(s)
- Jungdae Kim
- Nano Primo Research Center, Advanced Institute of Convergence Technology, Seoul National University, Suwon 443-270, South Korea
- Pharmacopuncture Medical Research Center, Korean Pharmacopuncture Institute, Seoul 157-801, South Korea
| | - Dong-Hyun Kim
- Department of Nano-Optical Engineering, Korea Polytechnic University, Siheung 429-793, South Korea
| | - Sharon Jiyoon Jung
- Nano Primo Research Center, Advanced Institute of Convergence Technology, Seoul National University, Suwon 443-270, South Korea
- Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Suwon 443-270, South Korea
| | - Hyun-Ji Gil
- Nano Primo Research Center, Advanced Institute of Convergence Technology, Seoul National University, Suwon 443-270, South Korea
| | - Seung Zhoo Yoon
- Department of Anesthesiology, College of Medicine, Korea University, Seoul 02841, South Korea
| | - Young-Il Kim
- Department of Nano-Optical Engineering, Korea Polytechnic University, Siheung 429-793, South Korea
| | - Kwang-Sup Soh
- Nano Primo Research Center, Advanced Institute of Convergence Technology, Seoul National University, Suwon 443-270, South Korea
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Schroeder M, Viezens L, Wellbrock J, Fiedler W, Rüther W, Algenstaedt P, Hansen-Algenstaedt N, Schaefer C. Sunitinib treatment reduces tumor growth and limits changes in microvascular properties after minor surgical intervention in an in vivo model of secondary breast cancer growth in bone. J Surg Oncol 2016; 113:515-21. [DOI: 10.1002/jso.24185] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 01/13/2016] [Indexed: 01/10/2023]
Affiliation(s)
- Malte Schroeder
- Department of Trauma, Hand, and Reconstructive Surgery; University Medical Center Hamburg-Eppendorf; Hamburg Germany
- Department of Orthopaedics; University Medical Center Hamburg-Eppendorf; Hamburg Germany
| | - Lennart Viezens
- Department of Trauma, Hand, and Reconstructive Surgery; University Medical Center Hamburg-Eppendorf; Hamburg Germany
- Department of Orthopaedics; University Medical Center Hamburg-Eppendorf; Hamburg Germany
| | - Jasmin Wellbrock
- Department of Oncology and Hematology With The Sections Pneumonology and Bone Marrow Transplantation; Hubertus Wald Tumor Center; University Cancer Center Hamburg; University Medical Center Hamburg-Eppendorf; Hamburg Germany
| | - Walter Fiedler
- Department of Oncology and Hematology With The Sections Pneumonology and Bone Marrow Transplantation; Hubertus Wald Tumor Center; University Cancer Center Hamburg; University Medical Center Hamburg-Eppendorf; Hamburg Germany
| | - Wolfgang Rüther
- Department of Orthopaedics; University Medical Center Hamburg-Eppendorf; Hamburg Germany
| | - Petra Algenstaedt
- Department of Internal Medicine; University Medical Center Hamburg-Eppendorf; Germany
- Medicum Eppendorf; Hamburg Germany
| | - Nils Hansen-Algenstaedt
- Department of Orthopaedics; University Medical Center Hamburg-Eppendorf; Hamburg Germany
- OrthoCentrum Hamburg; Parkklinik Manhagen; Hamburg Germany
| | - Christian Schaefer
- Department of Orthopaedics; University Medical Center Hamburg-Eppendorf; Hamburg Germany
- Department of Spine Surgery; Klinikum Bad Bramstedt; Bad Bramstedt Germany
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The role of internal fixation for long bone metastasis prior to impending fracture: an experimental model. J Orthop Sci 2013; 18:659-66. [PMID: 23553542 DOI: 10.1007/s00776-013-0380-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 03/08/2013] [Indexed: 02/03/2023]
Abstract
BACKGROUND Patients with long bone metastasis have many therapeutic options, including surgery. However, the appropriate time for surgical intervention and the use of internal fixation prior to impending fracture remains controversial. The purpose of this study was to establish a long bone metastatic model with internal fixation, and to determine whether prophylactic internal fixation for long bone metastasis prior to impending fracture would affect bone destruction, tumor progression, and mortality. MATERIALS AND METHODS We implanted VX2 tumor cells into the tibiae of 45 rabbits divided equally into three groups: internal fixation, control, and sham groups. Rabbits were monitored by X-ray and computed tomography, and blood serum levels were examined every 2 weeks. RESULTS Computed tomography data revealed significantly higher bone destruction in rabbit tibiae in the sham and control groups compared with those in the fixation group; there were volumetric bone losses of 0.2, 0.4, and 2.3% in the fixation, sham, and control groups, respectively, at 3 weeks, which increased to 1.2, 2.5, and 6.1% at 5 weeks. Rabbits in the fixation group showed significantly prolonged survival (64.5 ± 13.5 days) in comparison with rabbits in the sham group (50.3 ± 11.6 days) and control group (38.2 ± 4.9 days). CONCLUSION Our results suggest that prophylactic internal fixation may hinder bone destruction and tumor progression, thus extending the survival period for patients with long bone metastasis.
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Narcisi R, Quarto R, Ulivi V, Muraglia A, Molfetta L, Giannoni P. TGF β-1 administration during ex vivo expansion of human articular chondrocytes in a serum-free medium redirects the cell phenotype toward hypertrophy. J Cell Physiol 2012; 227:3282-90. [PMID: 22105490 DOI: 10.1002/jcp.24024] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Cell-based cartilage resurfacing requires ex vivo expansion of autologous articular chondrocytes. Defined culture conditions minimize expansion-dependent phenotypic alterations but maintenance of the cells' differentiation potential must be carefully assessed. Transforming growth factor β-1 (TGF β-1) positively regulates the expression of several cartilage proteins, but its therapeutic application in damaged cartilage is controversial. Thus we evaluated the phenotypic outcomes of cultured human articular chondrocytes exposed to TGF β-1 during monolayer expansion in a serum-free medium. After five doublings cells were transferred to micromass cultures to assess their chondrogenic differentiation, or replated in osteogenic medium. Immunocytostainings of micromasses of TGF-expanded cells showed loss of aggrecan and type II collagen. Positivity was evidenced for RAGE, IHH, type X collagen and for apoptotic cells, paralleling a reduction of BCL-2 levels, suggesting hypertrophic differentiation. TGF β-1-exposed cells also evidenced increased mRNA levels for bone sialoprotein, osteopontin, matrix metalloproteinase-13, TIMP-3, VEGF and SMAD7, enhanced alkaline phosphatase activity and pyrophosphate availability. Conversely, SMAD3 mRNA and protein contents were reduced. After osteogenic induction, only TGF-expanded cells strongly mineralized and impaired p38 kinase activity, a contributor of chondrocytes' differentiation. To evaluate possible endochondral ossification progression, we seeded the chondrocytes on hydroxyapatite scaffolds, subsequently implanted in an in vivo ectopic setting, but cells failed to reach overt ossification; nonetheless, constructs seeded with TGF-exposed cells displayed blood vessels of the host vascular supply with enlarged diameters, suggestive of vascular remodeling, as in bone growth. Thus TGF-exposure during articular chondrocytes expansion induces a phenotype switch to hypertrophy, an undesirable effect for cells possibly intended for tissue-engineered cartilage repair.
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Affiliation(s)
- R Narcisi
- Stem Cell Laboratory, Advanced Biotechnology Center, Genova, Italy
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Schaefer C, Schroeder M, Fuhrhop I, Viezens L, Otten J, Fiedler W, Rüther W, Hansen-Algenstaedt N. Primary tumor dependent inhibition of tumor growth, angiogenesis, and perfusion of secondary breast cancer in bone. J Orthop Res 2011; 29:1251-8. [PMID: 21381098 DOI: 10.1002/jor.21402] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2010] [Accepted: 02/10/2011] [Indexed: 02/04/2023]
Abstract
The systemic balance of angiogenic and anti-angiogenic factors has been proposed to play a key-role in primary tumor growth dependent growth suppression of secondary tumors. Despite the importance of the organ microenvironment to angiogenesis and microcirculation, the influence of a primary tumor on secondary bone tumors has not been investigated so far. Since breast cancer has a high propensity to spread to bone, we used an in vivo xenograft model to determine the impact of growing breast cancer cells (MCF-7) in the mammary fat pad on the microvascular properties of subsequently inoculated secondary breast cancer tumors in bone. Mice were either treated with a resection of the primary tumor (n = 10) or no surgery (n = 9) and intravital microscopy was performed over 25 days in bone tumors. Tumor growth in bone was temporarily suppressed by the primary tumor on days 10 and 14. While microvascular permeability and vascular diameter decreased in both groups over time, the presence of the primary tumor was accompanied by a decreased tumor perfusion on days 8 and 10 through a reduction in vessels with diameters between 5 and 20 µm. The results imply a potential benefit of a therapeutic regime in which the resection of the primary tumor is combined with an anti-angiogenic therapy in the perioperative or direct postoperative period. This might result in reduced progression of bone metastasis subsequent to excision of the primary tumor.
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Affiliation(s)
- Christian Schaefer
- Orthopaedic Spine Surgery, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany.
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Proschek D, Tonak M, Kafchitsas K, Zangos S, Mack M, Theisen A, Kurth A. Direct Implantation of VX-2 Carcinoma: A New Rabbit Bone Model Using a Three-Dimensional Matrix as a Carrier for the Tumor Cells. Eur Surg Res 2011; 47:154-8. [DOI: 10.1159/000330451] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Accepted: 06/15/2011] [Indexed: 11/19/2022]
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Schaefer C, Fuhrhop I, Schroeder M, Viezens L, Otten J, Fiedler W, Rüther W, Hansen-Algenstaedt N. Microcirculation of secondary bone tumors in vivo: the impact of minor surgery at a distal site. J Orthop Res 2010; 28:1515-21. [PMID: 20872590 DOI: 10.1002/jor.21166] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Microcirculatory properties of tumors play a pivotal role in tumor progression and inefficacy of therapies. It has been hypothesized that surgical interventions result in an accelerated tumor growth by increasing the level of pro-angiogenic cytokines with subsequent amplification of tumor angiogenesis. To characterize the microvascular properties of secondary bone tumors in vivo and determine the impact of minor surgery on the microcirculation, we performed intravital microscopy over 25 days using a xenograft model of breast cancer tumor growth (MCF-7) in bone. After engraftment of tumors the mice were treated with a mastectomy versus no surgery. Tumor growth was accompanied by angiogenic sprouting and decreased vascular diameters while blood flow rate and tumor perfusion remained constant. Mastectomy initially led to a significant reduction of functional vascular density, increased vascular diameter, and decreased blood flow velocities. However, neither tumor growth nor tissue perfusion was different between the groups. The presented study corroborates the assumption that tumor microcirculation in bone exhibits similar time-dependent alterations compared to soft tissue tumors. A minor surgical intervention did not change tumor growth kinetics however microcirculatory properties were altered. Whether major surgery has an impact on tumor growth in bone should be clarified in further studies.
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Affiliation(s)
- Christian Schaefer
- Orthopaedic Spine Surgery, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany.
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Hughes EL, Gavins FN. Troubleshooting methods: Using intravital microscopy in drug research. J Pharmacol Toxicol Methods 2010; 61:102-12. [DOI: 10.1016/j.vascn.2010.01.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2009] [Revised: 01/12/2010] [Accepted: 01/14/2010] [Indexed: 12/30/2022]
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