Related Experiment Videos
Harvesting the noncirculating pool of polymorphonuclear leukocytes in rats by hetastarch exchange transfusion (HET):
J H Williams1, K M Moser, T Ulich
1Pulmonary Division, University of California, Irvine.
Abstract:
Isolation of polymorphonuclear leukocytes (PMN) provides an opportunity to study PMN activity in vitro and to label PMN for study of in vivo kinetics. However, simple phlebotomy (SP) of a small animal frequently yields too few PMN for in vitro handling, while PMN harvested from an induced-peritonitis may not accurately reflect PMN in a less stimulated state. We report a novel method of harvesting PMN from the circulation of rats, using hetastarch exchange transfusion (HET), which is both time and animal sparing. HET harvested 8-fold more PMN than SP. In vitro cell function was examined with assays of adherence, chemotaxis, bacterial killing, and superoxide generation. No significant (p less than 0.05) difference was found between PMN obtained by HET and pooled-PMN obtained by SP. In vivo function was examined following labeling with indium111-oxine. The kinetics pattern described suggested normal migratory activity when compared to previous reports. The data demonstrate that rats possess a relatively large, noncirculating pool of PMN which is readily accessible by HET.
Insights
A novel hetastarch exchange transfusion (HET) method efficiently harvests polymorphonuclear leukocytes (PMN) from rats. This technique yields significantly more PMN than simple phlebotomy, preserving cell function for research.
Area of Science:
- Immunology
- Hematology
- Animal Models
Background:
- Polymorphonuclear leukocytes (PMN) are crucial for immune responses.
- Current methods for isolating PMN from small animals, like simple phlebotomy or induced peritonitis, have limitations.
- These limitations include insufficient cell yield or altered cell states, hindering accurate in vitro and in vivo studies.
Purpose of the Study:
- To develop and validate a novel, time- and animal-sparing method for harvesting large quantities of PMN from rat circulation.
- To compare the efficiency and effectiveness of the new method against existing techniques.
- To assess the functional integrity of PMN isolated using the new method.
Main Methods:
- A hetastarch exchange transfusion (HET) technique was employed for PMN harvesting from rats.
- PMN yields were compared between HET and simple phlebotomy (SP).
- In vitro functional assays included adherence, chemotaxis, bacterial killing, and superoxide generation.
- In vivo kinetics were evaluated after labeling PMN with indium-111-oxine.
Main Results:
- HET harvested approximately eight times more PMN compared to SP.
- No significant differences in in vitro functional assays (adherence, chemotaxis, bacterial killing, superoxide generation) were observed between HET- and SP-derived PMN.
- In vivo kinetic studies indicated normal migratory activity for HET-derived PMN.
- The study identified a readily accessible, large, noncirculating pool of PMN in rats.
Conclusions:
- Hetastarch exchange transfusion (HET) is a highly efficient method for isolating functional polymorphonuclear leukocytes (PMN) from rats.
- This technique overcomes the limitations of traditional methods, providing sufficient PMN for comprehensive in vitro and in vivo research.
- The findings suggest that rats have a substantial reserve of PMN accessible through HET, advancing immunological research in this model.