Krause W J
Department of Pathology and Anatomical Sciences, School of Medicine, University of Missouri, Columbia, USA.
Anat Histol Embryol. 2011 Oct;40(5):352-9. doi: 10.1111/j.1439-0264.2011.01092.x. Epub 2011 Jun 15.
The secretory units of the platypus and echidna mandibular glands consist of a single serous cell type. Secretory granules within the cells of the platypus mandibular gland stained intensely with the periodic acid-Schiff staining procedure but failed to stain with Alcian Blue, suggesting the granules contained neutral glycoproteins. Secretory granules within the mandibular glands of the echidna failed to stain with the methods used indicating little if any glycoprotein was associated with the secretory granules. Ultrastructurally, secretory granules of the platypus mandibular gland were electron dense with a central core of less electron-dense material and were membrane bound. In contrast, those of the echidna presented a lamellated appearance and also were limited by a membrane. These secretory granules appeared to form as a result of concentric layering of lamellae within cisternae of the Golgi membranes. The intralobular ductal system of the platypus was more extensively developed than that of the echidna. The striated ducts of both species were characterized by elaborate infoldings of the basolateral plasmalemma and an abundance of associated mitochondria.
鸭嘴兽和针鼹下颌腺的分泌单位仅由一种浆液细胞类型组成。鸭嘴兽下颌腺细胞内的分泌颗粒经高碘酸-希夫染色法染色后颜色较深，但用阿尔辛蓝染色法未着色，这表明这些颗粒含有中性糖蛋白。针鼹下颌腺内的分泌颗粒用所采用的方法染色后未着色，这表明分泌颗粒几乎不含有或根本不含有糖蛋白。在超微结构上，鸭嘴兽下颌腺的分泌颗粒电子密度较高，中央有一个电子密度较低的核心物质，且有膜包裹。相比之下，针鼹的分泌颗粒呈现出层状外观，同样也有膜包裹。这些分泌颗粒似乎是由高尔基体膜池内的薄片同心层叠形成的。鸭嘴兽的小叶内导管系统比针鼹的更发达。两种动物的纹状管都具有基底外侧质膜的精细褶皱以及大量相关的线粒体。
