Ultrastructural evaluation of bronchial lymphoid aggregates and lymphoid nodules in calves at different ages

Zuki A. B. Z., . and Saw Po Po, . and M. Zamri Saad, . Ultrastructural evaluation of bronchial lymphoid aggregates and lymphoid nodules in calves at different ages. pp. 1-8. ISSN 9128-2506

This study was conducted with the aim of defining the ultrastructure of bronchial lymphoid aggregates and lymphoid nodules of the bronchus-associated lymphoid tissue (BALT) in 3- 6-and 8-month-old calves. A total of 9 calves divided into 3 age groups of 3 calves in each group was used in this study. Samples of the lungs were taken systematically and processed for scanning electron microscopic (SEM) and transmission electron microscopic (TEM) examinations. The results revealed differences between the epithelium of lymphoid aggregates and lymphoid nodules. SEM showed the absence of cilia over the lymphoid nodules but not over aggregates. Flattened non-ciliated epithelial cells which may be precursors of the M cells were found in lymphoepithelium (LPE) of 3-month-old calves over nodules. The non-ciliated epithelial cells over nodules in 6-and 8-month-old calves were columnar in bronchi but in bronchioles they were cuboidal. However in the 3-month-old calves some were columnar and some flattened in bronchi and in bronchiole they were cuboidal. Transmission electron microscopic examination showed the presence of two types of M cells found in the LPE. Type 2 M cells were found in 3-and 6-month-old calves while type 1 M cells predominated in the bronchi in 6-and 8-month old calves. This work represents the first systematic investigation of the similarities and differences in the ultrastructure of lymphoid aggregates and lymphoid nodules in calves and changes there in as a function of age.

Full text available from: Official URL: https://www.mavma.org.my/2009-volume-21-issue-no-1...

Abstract

This study was conducted with the aim of defining the ultrastructure of bronchial lymphoid aggregates and lymphoid nodules of the bronchus-associated lymphoid tissue (BALT) in 3- 6-and 8-month-old calves. A total of 9 calves divided into 3 age groups of 3 calves in each group was used in this study. Samples of the lungs were taken systematically and processed for scanning electron microscopic (SEM) and transmission electron microscopic (TEM) examinations. The results revealed differences between the epithelium of lymphoid aggregates and lymphoid nodules. SEM showed the absence of cilia over the lymphoid nodules but not over aggregates. Flattened non-ciliated epithelial cells which may be precursors of the M cells were found in lymphoepithelium (LPE) of 3-month-old calves over nodules. The non-ciliated epithelial cells over nodules in 6-and 8-month-old calves were columnar in bronchi but in bronchioles they were cuboidal. However in the 3-month-old calves some were columnar and some flattened in bronchi and in bronchiole they were cuboidal. Transmission electron microscopic examination showed the presence of two types of M cells found in the LPE. Type 2 M cells were found in 3-and 6-month-old calves while type 1 M cells predominated in the bronchi in 6-and 8-month old calves. This work represents the first systematic investigation of the similarities and differences in the ultrastructure of lymphoid aggregates and lymphoid nodules in calves and changes there in as a function of age.

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Item Type:	Article
AGROVOC Term:	Calves
AGROVOC Term:	Ultrastructure
AGROVOC Term:	Lungs
AGROVOC Term:	Electron microscopy
AGROVOC Term:	Scanning microscopy
AGROVOC Term:	Transmissions
AGROVOC Term:	Epithelium
AGROVOC Term:	Bronchi
AGROVOC Term:	Slaughtering
AGROVOC Term:	Lymphocytes
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8469

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