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We investigated the role of excitatory amino acid receptors in mechanical hyperalgesia induced by subcutaneous injection of Freund's complete adjuvant (FCA) into the rat hind paw. In normal rats, an intraplantar (i.pl.) injection of l-glutamate, but not of d-glutamate (3 pmol/0.1 ml each) produced a mechanical hyperalgesia in the hind paw with a lowered paw-withdrawal threshold to pressure. In rats...
The present study examined the effect that aging has on the manifestations of pain behaviors in a rat model of neuropathic pain. Two experiments were conducted. The first experiment compared young, mature and old rats. After tight ligation of the L5 and L6 segmental spinal nerves, young rats displayed much more vigorous behavioral signs of mechanical allodynia and ongoing pain than did either mature...
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