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- W2969856815 abstract "Eatable crustaceans are susceptible to bacterial septicemia from injury or a compromised immune defense, which can possibly have detrimental effects in mammals that consume them. Since many crustaceans (i.e., crabs, lobsters and crayfish) are used for animal food and human consumption, it is of interest to understand the effects potential bacterial infections can have on their health as well as ours, including effects on cardiovascular and neuromuscular activities. The Red Swamp crayfish (Procambarus clarkii) was used as a model crustacean to investigate the effect of direct exposure to isolated endotoxin lipopolysaccharide (LPS) and the associated peptidoglycans from gram-negative bacteria (Serratia marcescens). S. marcescens is a common strain identified to cause septicemia in mammals and is prevalently found in nature. LPS injection into the hemolymph of crayfish revealed acute changes in heart rate and effects on survival. Direct LPS exposure on an in situ sensory-CNS-motor circuit produces a decrease in recruiting of the motor nerve at 500 μg/ml but has no significant effect at 100 μg/ml. At the isolated neuromuscular junction, the direct action of the LPS endotoxin (500 μg/ml) enhances evoked synaptic transmission, while not altering facilitation. Also, the amplitude and the frequency of spontaneous vesicle fusion events was not altered by LPS exposure. However, the resting membrane potential of the muscle transiently hyperpolarizes. These direct actions on tissues appear to be independent of innate immune responses and suggest the LPS targets on these tissues have a role in excitability of cellular function. {242 words}." @default.
- W2969856815 created "2019-08-29" @default.
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- W2969856815 date "2019-11-01" @default.
- W2969856815 modified "2023-09-27" @default.
- W2969856815 title "Effects of bacterial endotoxin on regulation of the heart, a sensory-CNS-motor nerve circuit and neuromuscular junctions: Crustacean model" @default.
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- W2969856815 doi "https://doi.org/10.1016/j.cbpa.2019.110557" @default.
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