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Enhanced thromboxane synthesis and vacuolization in human polymorphonuclear leucocytes induced by human lymphokine
Abstract:
PMN's were cultivated in vitro and treated with supernatants obtained from mitogenic-induced lymphocytes of human tonsil. Cytoplasmic vacuolization increased with time and there was a lower number of neutrophilic clumps in the culture treated with a supernatant containing lymphotoxin. In addition, the PMN's released more thromboxane B2 which was inhibited by indomethacin. We conclude that the action of lymphotoxin on the target PMN's is not mediated by the production of thromboxane B2.
Insights
Lymphotoxin, derived from human tonsil lymphocytes, causes changes in polymorphonuclear leukocytes (PMNs). However, it does not appear to mediate its effects through thromboxane B2 production.
Area of Science:
- Immunology
- Cell Biology
Background:
- Polymorphonuclear leukocytes (PMNs) are crucial immune cells.
- Lymphotoxin is a cytokine with known biological activities.
Purpose of the Study:
- To investigate the effects of lymphotoxin on PMNs in vitro.
- To determine if lymphotoxin's action on PMNs involves thromboxane B2 production.
Main Methods:
- Culturing human PMNs in vitro.
- Treating PMNs with supernatants from mitogen-induced lymphocytes containing lymphotoxin.
- Measuring cytoplasmic vacuolization, neutrophilic clumping, and thromboxane B2 release.
- Using indomethacin to inhibit thromboxane B2 production.
Main Results:
- Lymphotoxin treatment increased cytoplasmic vacuolization in PMNs over time.
- A reduced number of neutrophilic clumps was observed in cultures treated with lymphotoxin.
- PMNs released increased amounts of thromboxane B2, an effect inhibited by indomethacin.
Conclusions:
- Lymphotoxin induces specific morphological changes in PMNs.
- The observed effects of lymphotoxin on PMNs are not mediated by thromboxane B2 production.