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Antigen-induced changes in the lymphocyte-high endothelial venule interaction.
Acta Morphologica Hungarica
|January 1, 1991
Summary
This study quantifies changes in lymph node morphometrics and high endothelial venule (HEV) function after an antigenic challenge. Enhanced HEV-adhesiveness correlates with increased lymphocyte migration to challenged lymph nodes.
Area of Science:
- Immunology
- Lymphatic System Biology
- Cellular and Molecular Medicine
Background:
- High endothelial venules (HEVs) are critical for lymphocyte trafficking in lymphoid organs.
- Understanding HEV dynamics post-antigenic challenge is key to deciphering immune responses.
Purpose of the Study:
- To investigate sequential changes in lymph node morphometry and HEV function after sheep red blood cell (SRBC) challenge in rats.
- To establish a quantitative method for assessing HEV-adhesiveness using HEV-content measurements.
Main Methods:
- Daily measurements of lymph node weight and HEV-content over seven days post-SRBC challenge.
- Quantification of HEV-adhesiveness via a HEV binding assay.
- Correlation of morphometric changes with HEV functional alterations.
Main Results:
- Lymph node weight increased by day 2, attributed to enhanced blood flow.
- HEV-content changes suggested dilation and increased HE cell height.
- Peak HEV-adhesiveness was observed on day 6 post-challenge.
Conclusions:
- HEV-adhesiveness can be numerically estimated and quantitatively compared using HEV-content in binding assays.
- Altered HEV-adhesiveness plays a significant role in augmenting lymphocyte migration to challenged lymph nodes.