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Published on: April 22, 2014
Lymphocyte interactions with the extracellular matrix of malignant cells in vitro: a morphological and
1Department of Experimental Physiology, Medical School, University of Athens, Greece.
Insights
Lymphocytes interact differently with mixed cell cultures. Activated lymphocytes destroy tumor cells but degenerate in mixed cultures, forming abnormal cell nodules due to the extracellular matrix.
Area of Science:
- Immunology
- Cell Biology
- Extracellular Matrix Research
Background:
- The extracellular matrix (ECM) plays a crucial role in cell-cell interactions and immune responses.
- Understanding lymphocyte behavior within complex microenvironments is vital for cancer immunology.
Purpose of the Study:
- To investigate lymphocyte interactions with extracellular matrix components in mixed cell cultures.
- To determine the effects of mixed normal and malignant cell clones on lymphocyte behavior and cytolytic activity.
Main Methods:
- Co-culture of activated and pre-activated peripheral lymphocytes with normal, malignant, and mixed cell clones.
- Histological and immunocytochemical analysis of cell nodules and lymphocyte morphology.
- Assessment of lymphocyte cytolytic activity and extracellular matrix deposition.
Main Results:
- Activated lymphocytes exhibited cytolytic activity against pure normal or malignant cell clones.
- Lymphocytes in mixed cell cultures (normal with malignant cells) or with embryonic cells underwent degeneration, forming adenoid-type nodules.
- Pre-activated lymphocytes failed to lyse target cells in mixed cultures and showed abnormal cell division, forming structures attached to the ECM.
- Leukocyte common antigen deposition was observed on target tumor cells and within the ECM.
Conclusions:
- The specific glycosaminoglycans-protease-membrane ECM in mixed cell cultures influences lymphocyte behavior.
- Lymphocyte degeneration and altered morphology are attributed to interactions with this specialized ECM.
- The ECM composition significantly modulates immune cell responses in heterogeneous cellular environments.
Abstract:
The interactions of lymphocytes with the glycosaminoglycans-protease-membrane extracellular matrix, produced by mixed cell cultures of normal with malignant cell clones, were examined. Pre-activated and activated heterologous peripheral lymphocytes were used. Co-cultures of activated lymphocytes with all cell types used, formed identical cell nodules. Histology of cell nodules showed that activated lymphocytes were cytolytic to pure normal or malignant cell clones. On the contrary, lymphocytes in nodules with mixed cell clones (normal with malignant cell clones) or embryonic cells, underwent degeneration changing the fusiform type tumor nodule into the adenoid type. The adenoid type cell nodule consisted of cells with high nuclear to cytoplasm ratio and mitotic activity. In addition, leukocyte common antigen was deposited in the extracellular matrix and on the cell membrane of target tumor cells. Pre-activated lymphocytes, in mixed cell cultures, failed to lyse the target tumor cells and underwent abnormal cell divisions, producing subsets similar to nuclear vlimata, which remained attached to the extracellular matrix. The morphological and immunocytochemical observations of lymphocytes were discussed and attributed to the presence of the specific extracellular matrix of glycosaminoglycans-protease-membranes.
