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Study on the Characterization of Structure and Distributive Changes of Mucosal Immunity-associated Cells in Small Intestine of the Yak

Author: ZuoYuZhen
Tutor: JiaNing
School: Gansu Agricultural University
Course: Basic Veterinary Science
Keywords: Yak Small intestinal structure Intraepithelial lymphocytes Goblet cells Plasma cells Mast cells
CLC: S823
Type: Master's thesis
Year: 2011
Downloads: 32
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Abstract


Yak is of specific species of livestock resources. Resistance to hypoxic environment, alpine meadow pasture resources for food for local herders irreplaceable subsistence and production, is alpine grassland animal husbandry an important pillar of the economy. Gastrointestinal mucosa is not only the yak to digest, absorb the nutrients in the workplace, but also an important immune barrier. Histochemical techniques, image analysis, and transmission electron microscopy reveal yak small intestinal structure and mucosal immune cell distribution and the variation of the number of the yak intestinal morphology and intraepithelial lymphocytes, goblet cells, plasma cells and mast cell distribution and variation. The results show that: The yak small intestine mucosa, submucosa, muscularis and serosa. Small intestine duodenal villus height / crypt depth ratio the highest (duodenum 3.0 ± 0.5, jejunum 2.1 ± 0.2, 1.4 ± 0.3 ileum), muscularis thickest (duodenum 2242.2 ± 155.4μm jejunum 1155.7 ± 47.9μm, ileum 1974.8 ± 86.4μm); the jejunal villi highest (duodenum 1468.7 ± 53.3μm, jejunum 1828.4 ± 112.5μm ileum 1336.0 ± 84.5μm), the deepest crypts (of duodenal 553.3 ± 30.4μm jejunum 947.6 ± 85.5μm ileum 781.0 ± 52.2μm); very significant differences between the three sections of the small intestine villus height, crypt depth, villus height / crypt depth ratio and myometrial thickness (P lt; 0.01). The yak intestinal intraepithelial lymphocyte count by the duodenum to the gradually decreases and the difference was very significant (duodenum, 31.4 ± 3.9, jejunum 25.6 ± 3.0, ileum 24.2 ± 3.3) (P lt; 0.01), goblet cells (ten duodenum 18.0 ± 2.1, jejunum, ileum, 14.7 ± 1.6, 6.5 ± 1.5) and mast cells (duodenum, 39.3 ± 4.9, jejunum 35.5 ± 4.2 ileum 25.4 ± 3.9) number gradually decreases and the difference was very significant (P lt ; 0.01), while the number of plasma cells from the duodenum to the ileum is gradually increasing and very significant difference (duodenum 3.7 ± 1.1, the jejunal 8.1 ± 1.5, ileum 10.4 ± 2.0) (P lt; 0.01). Electron microscopy showed that yak intestinal villus epithelial cells connected to the tight junctions, gap junctions and half-bridge connection, the cells free surface microvilli rich; the intraepithelial lymphocytes nuclear, cytoplasmic less; goblet cells showed a typical goblet-shaped cells The top contains a large number of secretory granules and enlargement; plasma cells were round or oval, chromatin is arranged along the nuclear membrane, cytoplasm rich endoplasmic reticulum; oval-shaped mast cells, the cytoplasm is filled with strong electron density The film package particles of different sizes. Characteristics of yak small intestine structure can effectively improve the digestion and absorption efficiency of alpine grassland pasture; small intestine regular distribution of the mucosal immune function cells yak intestinal mucosal mucosal immune barrier.

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > Livestock > Cow
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