Why is intravascular antibody labeling necessary before heart digestion?

Intravascular labeling with anti-CD45 antibody distinguishes circulating leukocytes from true tissue-resident immune cells, preventing false positives in flow cytometry analysis. This step is critical for accurate quantification of cardiac macrophage and dendritic cell subsets, especially during steady state when contaminating blood cells can obscure rare populations. The method ensures that only bona fide myocardial immune cells are counted, improving data reliability for target validation studies.

How does enzymatic and mechanical digestion enable single-cell suspension preparation?

The combination of collagenase, hyaluronidase, and DNAse with mechanical mincing breaks down extracellular matrix and digests nucleic acids to release individual cells without excessive damage. This approach generates a viable cell suspension suitable for flow cytometry by preserving surface antigen integrity while achieving tissue dissociation. The protocol includes cold handling and rapid processing to prevent antigen internalization and maintain staining quality for downstream immunophenotyping.

What quantitative flow cytometry outputs enable immune subset comparison?

The method enables quantification of immune cell subsets as percentages of CD45+ cells, including macrophages (CD64+) and dendritic cells (CD11c+ MHC-IIhi), which can be further subdivided by CD103 or CD11b expression. These readouts allow direct comparison between experimental groups, such as wild-type versus Batf3-deficient mice, to confirm specific subset losses. The data supports mechanistic de-risking by revealing whether genetic or pharmacological interventions alter specific immune populations in the heart.

Why are replication requirements important for cross-functional collaboration?

The procedure specifies that a medium-sized experiment using 10 hearts takes 2–3 hours, defining a practical throughput for consistent replication across teams. Standardized timing for perfusion, digestion, and staining ensures that immune cell yields and viability are comparable between operators and laboratories. This reproducibility supports reliable data sharing in multidisciplinary projects involving immunology, pharmacology, and pathology teams working on cardiovascular targets.

What statistical analysis capabilities are required before implementing this method?

Implementing this method requires the ability to perform flow cytometry data analysis with gating strategies for live single cells, CD45+ immune cells, and subset markers like CD64, CD11c, MHC-II, CD103, and CD11b. Researchers must be able to calculate subset frequencies, perform statistical comparisons (e.g., t-tests or ANOVA) across conditions, and assess data normality for proper test selection. These capabilities are essential to translate raw flow data into meaningful biological insights for target validation and mechanism of action studies.

عزل وتحديد الخلايا المناعية اكسترافاسكولار للقلب

13.3K مشاهدات

تم الاستشهاد 20 مرة

08:24 د

أغسطس 23, 2018

10.3791/58114-v

أغسطس 23, 2018

13.3K مشاهدات

Laura Aronoff¹^,² , Slava Epelman¹^,²^,³^,⁴^,⁵ , Xavier Clemente-Casares¹^,²

¹Toronto General Hospital Research Institute, University Health Network (UHN), ²Dept of Laboratory Medicine and Pathobiology, University of Toronto, ³Dept of Immunology, University of Toronto, ⁴Peter Munk Cardiac Centre, ⁵Ted Rogers Centre for Heart Research

ويقدم هذا البروتوكول وسيلة بسيطة وفعالة عزل والتعرف على والتحديد الكمي للخلايا المناعية المقيمين في عضلة القلب الفئران أثناء حالة ثابتة أو التهاب. البروتوكول يجمع الهضم الأنزيمي والميكانيكية لتوليد تعليق خلية مفردة يمكن تحليلها مزيد من التدفق الخلوي.