The authors would like to thank Andre Han and Lawrence Yen for technical assistance, and members of the Jenkins lab for help in the development of this protocol.

1. Cell Isolation from Lymphoid Tissue
<ol>
 <li>Add 1 ml of ice cold cEHAA (EHAA + 10% FBS, pen/strep, gentamycin, 2 mM L-glutamine, 55 mM 2-mercaptoethanol) or other equivalent T cell medium, to a 60 mm culture dish containing a small square of 100 &mu;m nylon mesh and place on ice.</li>
 <li>Euthanize mouse.</li>
 <li>Remove the spleen and as many easily accessible lymph nodes as possible. These should include at least the inguinal, axillary, brachial, cervical, and mesenteric lymph nodes. Place them on top of the n...

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No conflicts of interest declared.

The pMHC tetramer based cell enrichment method presented by this protocol is a powerful tool for studying epitope-specific T cells from endogenous T cell repertoires. The use of pMHC tetramers enables detection of epitope-specific T cells based directly on the ability of their TCRs to bind cognate pMHC ligands. The enrichment provides a level of sensitivity such that extremely rare populations of antigen-specific T cells can be detected from endogenous repertoires of T cells without any manipulation of their gene...

<table border="1">
 <tbody>
 <tr>
 <td>Reagent</td>
 <td>Vendor</td>
 <td>Catalog number</td>
 </tr>
 <tr>
 <td>PE or APC conjugated pMHC tetramer (or multimer)</td>
 <td>Made by investigator, obtained from the NIH tetramer core, or purchased from commercial sources</td>
 <td></td>
 </tr>
 <tr>
 <td>Anti-PE conjugated magnetic microbeads</td>
 <td>Miltenyi</td>
 <td>130-048-801</td>
 </tr>
 <tr>
 <td>Anti-APC conjugated magnetic microbeads</td>
 <td>Miltenyi</td>
 <td>130-090-855</td>
 </tr>
 <tr>
 <td>LS magnetic columns</td>
 <td>Miltenyi</td>
 <td>130-042-401</td>
 </tr>
 <tr>
 <td>MidiMACS or QuadroMACS magnet</td>
 <td>Miltenyi</td>
 <td>130-042-302 or 130-090-976</td>
 </tr>
 <tr>
 <td>Cell counting beads</td>
 <td>Life Technologies</td>
 <td>PCB-100</td>
 </tr>
 </tbody>
 </table>

peptide:mhc tetramer-based enrichment of epitope-specific t cells

A basic necessity for researchers studying adaptive immunity with in vivo experimental models is an ability to identify T cells based on their T cell antigen receptor (TCR) specificity. Many indirect methods are available in which a bulk population of T cells is stimulated in vitro with a specific antigen and epitope-specific T cells are identified through the measurement of a functional response such as proliferation, cytokine production, or expression of activation markers1. However, these methods only identify epitope-specific T cells exhibiting one of many possible functions, and they are not sensitive enough to detect epitope-specific T cells at naive precursor frequencies. A popular alternative is the TCR transgenic adoptive transfer model, in which monoclonal T cells from a TCR transgenic mouse are seeded into histocompatible hosts to create a large precursor population of epitope-specific T cells that can be easily tracked with the use of a congenic marker antibody2,3. While powerful, this method suffers from experimental artifacts associated with the unphysiological frequency of T cells with specificity for a single epitope4,5. Moreover, this system cannot be used to investigate the functional heterogeneity of epitope-specific T cell clones within a polyclonal population.
	The ideal way to study adaptive immunity should involve the direct detection of epitope-specific T cells from the endogenous T cell repertoire using a method that distinguishes TCR specificity solely by its binding to cognate peptide:MHC (pMHC) complexes. The use of pMHC tetramers and flow cytometry accomplishes this6, but is limited to the detection of high frequency populations of epitope-specific T cells only found following antigen-induced clonal expansion. In this protocol, we describe a method that coordinates the use of pMHC tetramers and magnetic cell enrichment technology to enable detection of extremely low frequency epitope-specific T cells from mouse lymphoid tissues3,7. With this technique, one can comprehensively track entire epitope-specific populations of endogenous T cells in mice at all stages of the immune response.

Figure 1 depicts representative flow cytometry plots of pMHCII tetramer enriched spleen and lymph node samples from naive mice, while Figure 2 depicts representative data for mice previously immunized with the relevant peptide+CFA. Serial gating removes autofluorescent and other unwanted events from the analysis of CD4+ T cell populations. The CD8+ T cell population serves as a useful internal negative control for pMHCII tetramer staining of CD4+ T cells. Note that bound fractions from t...

Watch this Scientific Journal Video about Peptide:MHC Tetramer-based Enrichment of Epitope-specific T cells at JoVE.com

Peptide:MHC Tetramer-based Enrichment of Epitope-specific T cells

This protocol describes the use of peptide:MHC tetramers and magnetic microbeads to isolate low frequency populations of epitope-specific T cells and analyze them by flow cytometry. This method enables the direct study of endogenous T cell populations of interest from in vivo experimental systems.

A  basic necessity for researchers studying adaptive immunity with in vivo experimental models is an  ability to identify T cells based on their T cell ...

peptidemhc-tetramer-based-enrichment-of-epitope-specific-t-cells

Research

JoVE Journal

Immunology and Infection

17.7K Görüntüleme.  Massachusetts General Hospital and Harvard Medical School. Epitopa spesifik T-hücrelerinin alçak frekans popülasyonları izole etmek ve akış sitometrisi ile analiz etmek için bunları MHC tetramerleri ve manyetik mikro-küreler: Bu protokol peptit kullanımı açıklanmıştır. Bu yöntem ilgi endojen T hücre popülasyonlarının doğrudan çalışma sağlar In vivo Deneysel sistemler.