Lethal and sub-lethal effects of UVB on juvenile Biomphalaria glabrata (Mollusca: Pulmonata).
Lethal and sub-lethal effects of UVB on juvenile Biomphalaria glabrata (Mollusca: Pulmonata).
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UVB 对幼年光滑 Biomphalaria glabrata（软体动物：Pulmonata）的致死和亚致死作用。
DOI：
10.1016/j.jip.2006.08.001
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发表时间：
2006
影响因子：
3.4
通讯作者：
Sullivan,JohnT
中科院分区：
文献类型：
--
作者：
Ruelas,DebbieS;Karentz,Deneb;Sullivan,JohnT
虽然曼氏血吸虫主要发生在热带地区，那里有强烈的太阳辐射，但紫外线对血吸虫传播的影响尚不清楚。研究了UVB （290 ~ 320nm）对曼氏螺螺中间寄主光螺幼虫的潜在影响。将白化蜗牛和野生蜗牛暴露在紫外线荧光灯的UVB照射下，观察它们的存活率、光再激活（光介导的DNA修复）、对摄食行为的影响以及形态学组织异常。UVB照射对光斑小蠊具有剂量依赖性的致死性。中波紫外线照射后暴露于白光下可提高存活率，这可能是由于光再激活作用。蛋壳提供了一些保护，但不是完全的保护。用黑色指甲油阻挡紫外线透过壳的实验表明，暴露在外的（头足）和封闭在壳内的（地幔和内脏肿块）组织的损伤导致了致命辐射蜗牛的死亡。野生型（色素）蜗牛比白化蜗牛更不容易受到UVB的致命影响，而且它们可能更有光活化能力。暴露在紫外线下会抑制蜗牛的进食行为，并导致触须分叉和头足生长。因此，UVB可能通过对蜗牛中间寄主的致死性和亚致死性损伤影响曼氏螺杆菌的生命周期。然而，蜗牛的光活化能力可能会减轻这些影响。
Although Schistosoma mansoni occurs mainly in the tropics, where intense levels of solar radiation are present, the impact of ultraviolet (UV) light on schistosome transmission is not known. The purpose of this study was to investigate potential effects of UVB (290–320nm) on juvenile Biomphalaria glabrata, the snail intermediate host of S. mansoni. Albino and wild-type snails were exposed to doses of UVB from UV-fluorescent lamps, and the following were measured: survival, photoreactivation (light-mediated DNA repair), effects on feeding behavior, and morphological tissue abnormalities. Irradiation with UVB is lethal to B. glabrata in a dose-dependent manner. Exposure to white light subsequent to UVB irradiation enhances survival, probably by photoreactivation. The shell offers some, but not complete, protection. Experiments in which UVB transmittance through the shell was blocked with black nail polish suggest that injury to both exposed (headfoot) and shell-enclosed (mantle and visceral mass) tissues contributes to mortality in lethally irradiated snails. Wild-type (pigmented) snails are less susceptible to lethal effects of UVB than albino snails, and they may be more capable of photoreactivation. UVB exposure inhibits snail feeding behavior, and causes tentacle forks and growths on the headfoot. Thus, UVB may influence the life cycle of S. mansoni by both lethal and sub-lethal damage to the snail intermediate host. However, the ability of snails to photoreactivate may mitigate these effects.