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首页> 外文期刊>Parasitology >Navigation within host tissues: cues for orientation of Diplostomum spathaceum (Trematoda) in fish towards veins, head and eye.
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Navigation within host tissues: cues for orientation of Diplostomum spathaceum (Trematoda) in fish towards veins, head and eye.

机译：在宿主组织内导航：提示鱼中双节叶（Trematoda）朝向静脉，头部和眼睛的方向。

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摘要

Cercariae of Diplostomum spathaceum penetrate the skin of fish, and then migrate along blood vessels and tissues towards the head and the eye-lens. We studied their orientation behaviour in tail fins of guppies and in chemical concentration gradients within agar-filled choice chambers. In fins, they entered veins and orientated cranially, independent of the blood flow and living cells. In choice chambers, they were attracted by a small molecular fraction of fish serum, D-glucose (at 1, 10, and 1000 microM), D-mannose, D-maltotriose and Cl-ions, whereas D-glucosamine repelled them (even at 1.0 nM). Amino acids were not attractive, but arginine in tetrapeptides attracted at concentrations as low as 1 microm and melatonin at 0.4-4.3 PM. We suggest a preliminary model for the behaviour of diplostomula in fish fins and attracting (+) or repelling (-) host cues: (1) migration towards deeper skin layers and avoidance of skin surface, cues: Cl-ions (+ and -), glucose (+), glucosamine (-), light radiation (-); (2) orientation in cranial direction, cue: Cl-ions (+); (3) localization of blood vessels, cues: glucose (+), arginine-residues (+); (4) localization of the retina, cue: melatonin (+). A comparison with the navigation mechanisms of tissue-migrating schistosomules and hookworm larvae reveals an enormous diversity of strategies.
机译：横贯孢子虫的尾rc穿透鱼的皮肤，然后沿着血管和组织向头部和眼睛的镜片迁移。我们研究了它们在孔雀鱼尾鳍中的定向行为以及琼脂填充选择室内的化学浓度梯度。在鳍中，它们独立于血流和活细胞进入静脉并颅骨定向。在选择室中，它们被一小部分鱼血清，D-葡萄糖（1、10和1000 microM），D-甘露糖，D-麦芽三糖和Cl离子所吸引，而D-葡萄糖胺却将它们排斥（甚至在1.0 nM下）。氨基酸没有吸引力，但是四肽中的精氨酸浓度低至1微米，而褪黑素则在0.4-4.3 PM时被吸引。我们为鱼鳍中的鳍足纲行为和吸引（+）或排斥（-）宿主线索提供了一个初步模型：（1）向更深的皮肤层迁移并避免皮肤表面，线索：Cl离子（+和-） ，葡萄糖（+），葡萄糖胺（-），光辐射（-）; （2）朝向颅骨方向，提示：Cl离子（+）; （3）血管的定位，提示：葡萄糖（+），精氨酸残基（+）; （4）视网膜的定位，提示：褪黑激素（+）。与组织迁移的血吸虫和钩虫幼虫的导航机制的比较揭示了多种策略。

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