Een eenvoudige en snelle protocol bij niet-enzymatisch distantiëren Verse menselijke weefsels voor de Analyse van Infiltrating Lymfocyten
Summary
This protocol describes the rapid non-enzymatic dissociation of fresh human tissue fragments for qualitative and quantitative assessment of CD45+ cells (lymphocytes/leukocytes) present in various normal and malignant human tissues. Additionally, the supernatant obtained from the primary tissue homogenate can be collected and stored for further analysis or experimentation.
Abstract
Het vermogen van maligne cellen aan het immuunsysteem, gekenmerkt door tumor ontsnappen van zowel aangeboren en adaptieve immuunreacties ontwijken nu aanvaard als een belangrijk kenmerk van kanker. Ons onderzoek op borstkanker richt zich op de actieve rol die tumor-infiltrerende lymfocyten spelen in tumorprogressie en prognose van de patiënt. Naar dit doel hebben we een methode voor de snelle isolatie van intacte lymfoïde cellen van normale en abnormale weefsels in een poging om hen nabij hun natieve toestand te evalueren. Homogenaten bereid met een mechanische dissociator geven beide verhoogde levensvatbaarheid en cel herstel met behoud van oppervlakte receptor expressie in vergelijking met enzym-verteerd weefsels. Bovendien, enzymatische digestie van de overblijvende onoplosbare materiaal geen bijkomende CD45 + cellen aangeeft dat kwantitatieve en kwalitatieve metingen in de primaire homogenaat waarschijnlijke gezondheidstoestand van infiltrerende subpopulaties in het weefsel Fragm herstellenent. De lymfoïde cellen in deze homogenaten kunnen gemakkelijk worden gekarakteriseerd met behulp van immunologische (fenotype, proliferatie, etc.) en moleculaire (DNA, RNA en / of eiwit) nadert. CD45 + cellen kunnen ook worden gebruikt voor subpopulatie zuivering, in vitro uitbreiding of cryopreservatie. Een bijkomend voordeel van deze benadering is dat het primaire weefsel supernatant van de homogenaten worden gebruikt om te karakteriseren en te vergelijken cytokinen, chemokinen, immunoglobulinen en antigenen aanwezig in normale en maligne weefsels. Dit protocol functioneert uitstekend voor menselijk borstweefsel en dienen voor een breed scala van normale en abnormale weefsels.
Introduction
The tumor microenvironment is composed of various cell types with numerous studies showing they each play distinct and important roles in tumorigenesis1,2. These include, but are not limited to, infiltrating immune cells, stromal cells, endothelial cells and tumor cells3. Ex vivo studies of tumor infiltrating lymphocytes (TIL; CD45+ cells or leukocytes, which are predominantly lymphocytes in breast tumors) from fresh human tissue samples is made difficult by their low frequency, the small sample sizes often available for research and the potential for loss of viability during extraction. Because immune cells infiltrating tumors are usually present as passengers rather than permanent residents in general they are easier to release from the tissue matrix.
Dissociating tumor tissue while maintaining cellular integrity is technically challenging and has traditionally been performed using a combination of mechanical and enzymatic steps to prepare single cell suspensions4-8. This approach involves lengthy incubation periods and is associated with a significant reduction in cell viability as well as the loss of cell surface receptors by enzymatic cleavage. High quality flow cytometric studies characterizing TIL in the tumor microenvironment as well as clean purifications of CD45+ subpopulations by flow cytometry or antibody-coated beads are more difficult to achieve from enzyme-digested tumor tissue. In addition, the supernatant (SN) from the resulting tumor homogenate is not amenable to further analysis including quantification of secreted proteins (cytokines, chemokines, immunoglobulins or tumor antigens) or experimental treatment of normal cells, because of the potential for protein degradation in the enzymatic digests.
In our search for a method to prepare single cell homogenates from breast tissues [including tumor, non-adjacent non-tumor (NANT) and normal (from mammary reductions) breast tissues] without enzymatic digestion, we tested a variety of mechanical homogenization techniques. Homogenates prepared using a mechanical dissociator had increased cell viability (2-fold) and total cell recovery (2-fold) while preserving surface receptor expression. Enzymatic digestion of the remaining insoluble material did not recover additional CD45+ cells suggesting they were all released in the initial homogenate. Thus, this rapid and simple approach allows both qualitative and quantitative assessment of the CD45+ subpopulations present in various normal and malignant human tissues. An added advantage of this approach is that the SN from the initial homogenate (primary tissue SN) can be collected and stored for further analysis or experimentation.
Protocol
Representative Results
Discussion
Deze studie beschrijft een geoptimaliseerde werkwijze voor de snelle bereiding van normaal en kwaadaardig borstweefsel homogenaten zonder enzymatische digestie voor daaropvolgende celsortering, extractie, cryopreservatie en / of fenotypische analyse van CD45 + subpopulaties. Het doel van deze experimentele aanpak is om beelden van de TIL die nauw geven hun in vivo staat en ze te vergelijken met normale weefsels met een minimum aan manipulatie van de weefsels vers van de operatiekamer te produceren. T…
Divulgazioni
The authors have nothing to disclose.
Acknowledgements
Dit werk werd ondersteund door subsidies fromthe Belgisch Fonds voor Wetenschappelijk Onderzoek (FNRS), Les Amis de l'Institut Bordet, FNRS-Opération Televie, Plan Cancer van België, Fonds Lambeau-Marteaux, Fonds JC Heuson en Fonds Barsy.
Materials
| Equipment | Company | Catalog Number | Comments/Description |
| GentleMacs Dissociator | Miltenyi Biotec | 130-093-235 | BD Medimachine is somewhat equivalent |
| Centrifuge 5810 R | Eppendorf | N/A | or other standard table top centrifuge |
| Centrifuge 5417 R | Eppendorf | N/A | or other standard microcentrifuge |
| Esco Class II A2 Biosafety Cabinet | ESCO global | N/A | or other standard BSL2 hood |
| Inverted Microscope | Nikon eclipse TS100 | N/A | or other microscope compatible for a hemacytometer |
| Bürker Chamber | Marienfield | 640210 | or other standard hemacytometer |
| Navios Flow Cytometer | Beckman Coulter | N/A | or other flow cytometer (8-10 color recommended) |
| Materials | Company | Catalog Number | Comments/Description |
| GentleMacs C-Tube | Miltenyi Biotec | 130-096-344 | BD Medimachine uses Filcon |
| Cell Culture Dish | Sarstedt | 72,710 | or other non-pyrogenic plasticware |
| Disposable Scalpel | Swann-Morton | 0510 | or standard single use sterile scalpel |
| BD Cell Strainer 40µm | Becton Dickinson | 734-0002 | or other non-pyrogenic plasticware |
| BD Falcon Tube 50mL | Becton Dickinson | 352070 | or other non-pyrogenic plasticware |
| BD Falcon Tube 15mL | Becton Dickinson | 352097 | or other non-pyrogenic plasticware |
| BD FACS Tube 5mL | Becton Dickinson | 352008 | or other non-pyrogenic plasticware |
| Sterile Pasteur Pipette 5 mL | VWR | 612-1685 | or other non-pyrogenic plasticware |
| Microfuge Tube 1.5 mL | Eppendorf | 7805-00 | or other non-pyrogenic plasticware |
| Reagents | Company | Catalog Number | Comments/Description |
| X-Vivo 20 | Lonza | BE04-448Q | serum-free medium recommended |
| Phosphate buffered saline | Lonza | BE17-516F | standard physiological PBS |
| Trypan blue | VWR | 17942E | or other vital stain |
| VersaLyse | Beckman Coulter | A09777 | for flow cytometry experiments |
| Fixable viability Dye eFluor 780 | eBioscience | 65-0865-14 | for flow cytometry experiments |
| anti-CD3 FITC | BD Biosciences | 345763 | for flow cytometry experiments |
| anti-CD3 Vio Blue | Miltenyi Biotec | 130-094-363 | for flow cytometry experiments |
| anti-CD4 PE | BD Biosciences | 345769 | for flow cytometry experiments |
| anti-CD4 APC | Miltenyi Biotec | 130-091-232 | for flow cytometry experiments |
| anti-CD8 ECD | Beckman Coulter | 737659 | for flow cytometry experiments |
| anti-CD8 PerCP | BD Biosciences | 345774 | for flow cytometry experiments |
| anti-CD19 APC-Vio770 | Miltenyi Biotec | 130-096-643 | for flow cytometry experiments |
| anti-CD45 VioGreen | Miltenyi Biotec | 130-096-906 | for flow cytometry experiments |
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