Intra-axonal injection of biologically active materials.
نویسندگان
چکیده
BRADY, ROSCOE O., CONSTANTINE S. SPYROPOULOS AND ICHITI TASAKI. htra-axonal injection of biologically active materiak n improved method for injection of chemicals into the squid giant axon is described. A large number of metabolically active materials were found to be without any effect upon the action potential. Tetraethylammonium chloride produced a striking prolongation of the action potential. Cocaine and ethanol caused a transient reduction in the amplitude of the action potential. A filter paper eluate was found to contain materials which caused repetitive firing followed by a reduction in amplitude of the action potential and finally inexcitability. _____ INTRODUCTION ~~IHE 1 INTERPRETATION of experiments on the extracellular application of chemicals is somewhat limited by the fact that there exists considerable doubt as to whether a given agent ever reaches its expected site of action. This difficulty may in part at least be circumvented by the intracellular introduction of the chemical in question. Several studies have been reported on the injection of materials into the giant axon of the squid (1-3) and lobster (4), into muscle fibers (s-S>, motor neurones (9, IO) and other cells (I I). In this communication, a modified method for the microinjection of materials into the squid giant axon is described, and the results of the first series of experiments are reported.
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ورودعنوان ژورنال:
- The American journal of physiology
دوره 194 1 شماره
صفحات -
تاریخ انتشار 1958