Abstract
Lampreys are one of the most primitive vertebrates still living today. They attach themselves to the body surface of the host fish through their sucker-like mouths and suck blood of the host for days. Recent fossil evidence has indicated that morphology of lampreys in the late Devonian period, over 360 million years ago, already possessed the present day major characteristics, suggesting the evolutionary stability of a highly specialized parasitic feeding habit. Obviously, nociceptive responses and hemostasis of the host are two major barriers to long-term feeding of the parasitic lamprey. It has been found, to counteract hemostasis of the host, that paired buccal glands of lampreys secrete antihemostatic compounds to prevent blood of the host from coagulation. However, it is not known how lampreys make the host lose nociceptive responses. Here, we prepared components of the crude extract from the buccal glands of the lampreys (Lampetra japonica). Then, we show that crude extract and one of its purified components reduce the firing frequency of neuronal action potentials probably through inhibiting the voltage-dependent Na+ channels. As the voltage-gated Na+ channels are highly conserved throughout evolution, we argue that the secretion of the lampreys could exert the similar effect on the Na+ channels of their host fish as well. Therefore, together with its antihemostatic effect, the secretion due to its inhibitory effect on neuronal excitability might provide a mechanism for the parasitic lampreys to keep their evolutionary stability.
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Abbreviations
- AP:
-
Action potential
- BGSP-1:
-
Buccal gland secretion protein-1
- CRISP:
-
Cysteine-rich secretory proteins
- CRBGP:
-
Cysteine-rich buccal gland protein
- DRG:
-
Dorsal root ganglion
- L. japonica :
-
Lampetra japonica
- SDS-PAGE:
-
Sodium dodecyl sulfate-polyacrylamide gel
- TTX-R:
-
Tetrodotoxin-resistant
- TTX-S:
-
Tetrodotoxin-sensitive
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Acknowledgments
This work was supported by grants from the National Basic Research Program of China (2005CB522804, 2006CB911003, 2006CB500703).
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Shaopeng Chi, Rong Xiao, and Qingwei Li contributed equally to this work.
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Chi, S., Xiao, R., Li, Q. et al. Suppression of neuronal excitability by the secretion of the lamprey (Lampetra japonica) provides a mechanism for its evolutionary stability. Pflugers Arch - Eur J Physiol 458, 537–545 (2009). https://doi.org/10.1007/s00424-008-0631-1
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DOI: https://doi.org/10.1007/s00424-008-0631-1