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The avian inflammatory response: adaptation and utilization of skin windows
Abstract:
A modified skin window system was developed and utilized for examination of the local inflammatory response in the chicken. Data were collected at 2, 4, 6, 8, 12, 24, 28, 32 and 48 hours following wing-web scarification. The first cells observed were heterophils and they remained the predominant type through 32 hours. Mononuclears began infiltrating at a rapid rate of 8 to 12 hours, and by 48 hours they represented slightly more than one-half of the total cells observed. The total number of cells present increased rapidly to a peak at 24 hours, and then declined during the 24 to 48 hour period. The percentage of heterophils and mononuclears showed an inverse relationship throughout the 48 hour period, as appreciable numbers of eosinophils and basophils were not observed. Macrophages were the predominant mononuclear cells. Degranulation of heterophils was extensive in the 2 to 4 hour periods, but was much less common thereafter. As the time after scarification increased, macrophages exhibited; (1) increased cytoplasm to nucleus ratio, (2) increased numbers of phagocytic vacuoles, and (3) a marked tendency to form giant cells. The results obtained in this study were similar to those recorded for mammals, except that the percentage shift toward mononuclears occurred at a faster rate in mammals.
Insights
This study details the chicken inflammatory response using a modified skin window. Heterophils dominate early, followed by a rapid increase in mononuclear cells, particularly macrophages, within 48 hours.
Area of Science:
- Avian immunology
- Inflammatory response mechanisms
- Comparative pathology
Background:
- Understanding avian inflammatory responses is crucial for disease management.
- The skin window technique offers a direct method to study cellular exudates.
- Limited data exists on the temporal dynamics of chicken inflammatory cell infiltration.
Purpose of the Study:
- To characterize the local inflammatory response in chickens using a modified skin window system.
- To analyze the kinetics of cellular infiltration and morphological changes over 48 hours post-scarification.
- To compare the avian inflammatory response to that observed in mammals.
Main Methods:
- A modified skin window technique was applied to chicken wing webs.
- Cellular exudates were collected and analyzed at multiple time points (2-48 hours) post-scarification.
- Differential cell counts and morphological assessments of macrophages were performed.
Main Results:
- Heterophils were the predominant cells for the first 32 hours.
- Mononuclear cells, primarily macrophages, rapidly infiltrated from 8-12 hours, becoming dominant by 48 hours.
- Macrophages showed increased phagocytic activity, cytoplasm-to-nucleus ratio, and giant cell formation over time.
Conclusions:
- The chicken inflammatory response involves an early heterophil influx followed by a pronounced mononuclear cell shift, similar to mammals but faster.
- Macrophages play a significant role in later stages of the acute inflammatory response in chickens.
- The modified skin window system is effective for studying avian inflammatory processes.