CD7 Antibody - T Cell Surface Marker for Immunology and Leukemia Research

Introduction

CD7 (Cluster of Differentiation 7) is a transmembrane glycoprotein expressed primarily on T lymphocytes and natural killer (NK) cells, where it plays a key role in T cell activation, differentiation, and immune signaling. As one of the earliest markers of T cell lineage commitment, CD7 is widely used in immunophenotyping, hematologic malignancy classification, and immune system research.

A CD7 antibody enables reliable detection of T cell populations across a wide range of experimental platforms, including immunohistochemistry, flow cytometry, and western blot. Its consistent expression on thymocytes and peripheral T cells makes it a foundational marker for studying T cell biology, immune development, and lymphoid malignancies.

CD7 Biology and Function

CD7 is a member of the immunoglobulin superfamily and is localized to the cell surface, where it participates in signaling events that regulate T cell activation and interactions with other immune cells. It is highly expressed during early T cell development in the thymus and remains present on mature T cells and NK cells.

Functionally, CD7 contributes to:

• T cell activation and co-stimulatory signaling
• Regulation of cytokine production
• Cell-cell interactions within the immune system
• NK cell-mediated cytotoxic responses

Loss or aberrant expression of CD7 has been reported in certain leukemias and lymphomas, making it a valuable diagnostic and research marker in hematopathology.

CD7 Antibodies in Research Applications

Immunohistochemistry (IHC)

CD7 antibodies are widely used to evaluate T cell distribution in tissue sections. In formalin-fixed, paraffin-embedded samples, CD7 staining highlights T lymphocytes within lymphoid organs such as tonsil and lymph node, as well as tumor-infiltrating lymphocytes in various cancers. This application is particularly useful for assessing immune contexture and identifying T cell-rich microenvironments.

Flow Cytometry (FACS)

Flow cytometry represents one of the most common uses of CD7 antibody reagents. CD7 serves as a key marker for identifying T cells and NK cells in peripheral blood, bone marrow, and cultured cell populations. It is frequently included in multicolor panels for leukemia and lymphoma immunophenotyping, where its expression pattern helps distinguish between different hematologic malignancies.

Western Blot (WB)

In western blot analysis, CD7 antibody allows detection of CD7 protein expression in cell lysates. This approach supports validation of expression levels, assessment of protein integrity, and comparison across experimental conditions.

Immunofluorescence (IF)

CD7 antibodies can be used in immunofluorescence to visualize membrane localization and distribution of CD7 in cultured cells or tissue sections. This is useful for studying spatial organization and co-localization with other immune markers.

Key Targets and Clones

CD7 antibody products are available in multiple formats, including monoclonal and polyclonal antibodies, as well as recombinant monoclonal clones designed for improved consistency and specificity. Different clones may vary in sensitivity, epitope recognition, and suitability for specific applications such as IHC or flow cytometry.

Selecting the appropriate CD7 antibody depends on:

• Application (IHC, FACS, WB, IF)
• Sample type (FFPE tissue, fresh cells, lysates)
• Detection method (chromogenic, fluorescent, enzyme-linked)

Why Choose CD7 Antibodies from NSJ Bioreagents

NSJ Bioreagents offers a range of CD antibody products designed to support immunology and cancer research. The CD7 antibodies are selected for their ability to detect CD7 expression across relevant experimental contexts, enabling researchers to study T cell biology, immune responses, and hematologic disease.