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Method Article
Here we describe the model and approach to study functions of pulmonary alveolar macrophages in cancer metastasis. To demonstrate the role of these cells in metastasis, the syngeneic (4T1) model of breast cancer in conjunction with the depletion of alveolar macrophage with clodronate liposomes was used.
This paper describes the application of the syngeneic model of breast cancer (4T1) to the studies on a role of pulmonary alveolar macrophages in cancer metastasis. The 4T1 cells expressing GFP in combination with imaging and confocal microscopy are used to monitor tumor growth, track metastasizing tumor cells, and quantify the metastatic burden. These approaches are supplemented by digital histopathology that allows the automated and unbiased quantification of metastases. In this method the routinely prepared histological lung sections, which are stained with hematoxylin and eosin, are scanned and converted to the digital slides that are then analyzed by the self-trained pattern recognition software. In addition, we describe the flow cytometry approaches with the use of multiple cell surface markers to identify alveolar macrophages in the lungs. To determine impact of alveolar macrophages on metastases and antitumor immunity these cells are depleted with the clodronate-containing liposomes administrated intranasally to tumor-bearing mice. This approach leads to the specific and efficient depletion of this cell population as confirmed by flow cytometry. Tumor volumes and lung metastases are evaluated in mice depleted of alveolar macrophages, to determine the role of these cells in the metastatic progression of breast cancer.
The premetastatic niche is an important process in cancer metastasis defined as a set of alterations that occur in the organs that are targets for metastases prior to arrival of tumor cells1,2. Therefore, therapeutic targeting of this step of cancer progression may prevent metastases to the vital organs that cause approximately 90% of cancer-associated deaths. Although the concept of the premetastatic niche, also known as the "seed and soil" theory, was introduced more than a century ago, no experimental proof has been provided until recently, when the bone marrow-derived cells were demonstrated to contribute to the premetastatic soil1,3-7. Despite these developments, the premetastatic niche remains a largely understudied aspect of cancer pathophysiology and further research to identify cellular players and mechanisms involved is needed.
Here we report the in vivo approaches to study the role of alveolar macrophages in breast cancer metastases and the lung premetastatic niche. The alveolar macrophages arrive to the lungs early during the embryonic development and self-renew there during adulthood8. They also have important immunomodulatory and homeostatic functions including the protection of this organ from undesired inflammatory responses to the environmental innocuous antigens9. Therefore, we hypothesize that tumors exploit this physiological immunosuppression, imposed by alveolar macrophages, and, consequently, alveolar macrophages contribute to the lung premetastatic niche by suppressing antitumor immunity. This hypothesis is supported by our recent report demonstrating that the specific depletion of these cells reduces lung metastases and enhances antitumor T cell responses10.
For these studies we apply a well-established syngeneic model of breast cancer (4T1), which mimics stage IV metastatic breast cancer11; and has been previously reported in studies of the premetastatic niche6. To track metastasizing tumor cells in vivo we use 4T1 cells expressing GFP (4T1-GFP) in conjunction with animal imaging and confocal microscopy. We focus on the lung premetastatic niche, since this organ is one of the most common targets of hematogenous metastases of human malignancies12. To investigate functions of alveolar macrophages in the premetastatic niche, we use clodronate liposomes to deplete these cells13; and evaluate impact of this depletion on lung metastases. Of note, this method specifically depletes alveolar macrophages but no other phagocytic cells in the lungs or in circulation10.
כל במחקרים בבעלי חיים אושרו על ידי טיפול בבעלי חיים מוסדיים ועדת שימוש של מרכז למדעי הבריאות באוניברסיטת טקסס טק ועקב אחר ההנחיות המתוארות בסעיף "מדריך לטיפול ושימוש בחיות מעבדה" שפורסם על ידי המכון הלאומי לבריאות. השתמש שמונה עד תריסר בשבוע עכברי BALB נקבה בת / ג כי הם זמינים מסחריים. להזריק 1 x 10 5 4T1 או 1 x 10 5 4T1 תאים להביע GFP, אשר ניתן לרכוש מיצרנים שונים, לתוך כרית שומן החלב.
1. תרבות של 4T1 ו 4T1-GFP תאים & הכנת תרחיף תא גידול עבור זריקות 14
2. מינהל אפי של ליפוזומים 10
הערה: בצע את כל השלבים באמצעות פתרונות סטריליים זרימת אוויר למינרית (LAF) קבינט ביו-בטיחות אלא אם צוין אחרת.
3. קורבן עכבר אוסף רקמות
הערה: השתמש autoclaved ומכשירים סטרילי לנתיחת עכבר. להרדים עכברים לאחר הרדמה דרך exsanguination והסרה של איברים חיוניים.
4. הערכה גרור ריאות
5. Cytometry זרימה (FACS) ניתוח של מקרופאגים מכתשיים בריאות
6. ניתוח של נתוני FACS: אסטרטגיות Gating ואת זיהוי של תת-אוכלוסיות ניידות
ההזרקה של תאים סרטניים 4T1-GFP לתוך כרית שומן החלב מובילה להיווצרות של גידולי עכבר (איור 1 א) כי לשחזר את ההתפשטות גרורתית של סרטן השד אנושי, כמו גרורות נוצרות במהירות בתוך הריאות (איור 2), כבד, עצמות והמוח של עכברים 11. Transfection יציב ש...
The recent insights into cancer biology and causative factors involved in carcinogenesis and tumor progression lead to development of genetically engineered mouse (GEM) models of cancer, in which tumors grow spontaneously, usually over a period of several months15. Although these tumor models appear to reflect better the natural history of human malignancies than xenografts or syngeneic models, much time required for tumor development and various degrees of malignant phenotype penetrance limit the use of these...
החוקרים מצהירים כי אין להם אינטרסים כלכליים מתחרים.
מחקר זה כבר נתמך על ידי משרד ההגנה להעניק TSA 140,010 לח"כ ו- BC 111,038 ל MMM דעות של, והמלצות על ידי המחבר (ים) לא משקפות את אלו של צבא ארה"ב או משרד ההגנה.
Name | Company | Catalog Number | Comments |
4T1 cell line | American Type Culture Collection, Manassas, VA, USA | CRL 2539 | Tumor cells |
4T1-GFP cell line | Caliper life sciences/ Perkin Elmer, Waltham, MA, USA | BW128090 | Tumor cells |
RPMI | Corning, Corning, NY, USA | 10-040-CM | Media |
Heat inactivated FBS | Gibco (Thermo Scientific), USA | 10082147 | Media |
Penicillin Streptomycin | Fisher Scientific, Waltham, MA, USA | MT-300-02-CI | Media |
PBS | Fisher Scientific, Waltham, MA, USA | BP399-20 | Dilute with distilled water |
Trypsin 0.25% with EDTA | Hyclone, Logan, Utah, USA | SH30042.02 | Tissue culture supplies |
T75 cm2 flask | Fisher Scientific, Waltham, MA, USA | 12-565-32 | Tissue culture supplies |
15 ml conical tube | BD falcon, Franklin Lakes, NJ, USA | 352096 | Tissue culture supplies |
50 ml conical tube | BD falcon, Franklin Lakes, NJ, USA | 352098 | Tissue culture supplies |
60 mm2 Petri dish | Fisher Scientific, Waltham, MA, USA | AS4052 | For lung imaging |
Isoflurane (Isothesia) | Butler Schein Animal health, Dublin, OH, USA | NDC 11695-6776-2 | Mouse anesthesia |
Clodronate liposomes | Formumax Scientific Inc, Palo Alto, CA, USA | F70101C-N | Macrophages depletion |
Control liposomes | Formumax Scientific Inc, Palo Alto, CA, USA | F70101-N | Control PBS-liposomes |
29 gauge insulin syringes (12.7 mm and 0.5 ml capacity)- Reli-On | Walmart, Bentonville, AR, USA | For tumor cell injection | |
Hair removal cream (Nair) | Walmart, Bentonville, AR, USA | ||
Paraformaldehyde solution (4%) | Affymetrix, Santa Clara, CA, USA | 19943-I Lt | Dilute to 4% or 1% using 1x PBS |
OCT compound | Fisher Scientific, Waltham, MA, USA | 230-730-571 | For freezing tissue in cryomolds |
Fluoro-Gel-II with DAPI | Electron Microscopy Sciences, Hatfield, PA, USA | 17985-51 | Mounting medium |
Sucrose | Sigma, St. Louis, MO, USA | S-9378 | Cryopreservation |
Collagenase P | Roche, Basel, Switzerland | 11249002001 | Components of tissue digestion buffer |
Dnase I | Roche, Basel, Switzerland | 10104159001 | Components of tissue digestion buffer |
Trypsin inhibitor | Sigma, St. Louis, MO, USA | T9253 | Components of tissue digestion buffer |
40 micron cell strainers | Fisher Scientific, Waltham, MA, USA | 22-363-547 | Used in tissue digestion to remove clumps |
Trustain FcX-Fc Block (CD16/CD32) | Biolegend, San Diego, CA, USA | 101320 | Antibodies for flow cytometry |
BV605 CD45 | Biolegend, San Diego, CA, USA | 103139 | Antibodies for flow cytometry |
PE CD11b | Biolegend, San Diego, CA, USA | 101207 | Antibodies for flow cytometry |
PE Cy7 F4/80 | Biolegend, San Diego, CA, USA | 123113 | Antibodies for flow cytometry |
APC/Cy7 CD11c | Biolegend, San Diego, CA, USA | 117323 | Antibodies for flow cytometry |
PerCPcy5.5 IA/IE (MHCII) | Biolegend, San Diego, CA, USA | 107625 | Antibodies for flow cytometry |
PE CD80 | Biolegend, San Diego, CA, USA | 104707 | Antibodies for flow cytometry |
AF647 CD86 | Biolegend, San Diego, CA, USA | 105019 | Antibodies for flow cytometry |
Fixable viability Dye eflour 506 | eBioscience, San Diego, CA,USA | 65-0866 | Antibodies for flow cytometry |
Cryostat | Leica Biosystems, Buffalo Grove, IL, USA | CM1850 | Cryosectioning |
UVP iBox Explorer | UVP Inc, Upland, CA, USA | Mouse and lung fluorescent imaging | |
Aperio Scanscope CS | Leica Biosystems, Buffalo Grove, IL, USA | Digital pathology | |
BD LSRFortessa | BD Biosciences, Franklin Lakes, NJ, USA | Flow cytometry/data acquisition | |
Nikon A1 confocal TE2000 microscope | Nikon Instruments Inc., Melville, NY 11747-3064, U.S.A. | Imaging and quantifying GFP fluorescence in lung cryosections | |
UVP visionworks software (Version 7.1RC3.38) | UVP Inc, Upland, CA, USA | Imaging software for iBOX | |
Aperio Imagescope software (v12.1.0.5029) | Leica Biosystems, Buffalo Grove, IL, USA | Imaging software for analysis of digital slides | |
Flow JO software (version 9.8.1) | Flow JO LLC, Ashland, OR, USA | Analysis of flow cytometric data | |
NIS Elements AR (version 4.20.01) 64 Bit | Nikon Instruments Inc., Melville, NY 11747-3064, U.S.A. | Acquisition and analysis of lung cryosections for GFP |
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