{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,17]],"date-time":"2023-10-17T17:45:14Z","timestamp":1697564714858},"reference-count":23,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2001,5,15]],"date-time":"2001-05-15T00:00:00Z","timestamp":989884800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2001,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>An emerging body of evidence from in vitro studies and in vivo animal models supports a pathogenic role of antibodies in the development of peripheral neuropathy associated with monoclonal gammopathy of undetermined significance (MGUS). Although the assessment of motor and sensory nerve fiber function is of clinical importance, it is seldom applied experimentally. We describe the application of an electrophysiologic method for the evaluation of motor and sensory nerve fiber function using an experimental model of MGUS neuropathy. Supramaximal stimulation of the tibial nerve elicited an early motor response (M\u2010wave, 1.7 \u00b1 0.1 ms, <jats:italic>n<\/jats:italic> = 10) and a late sensory (H\u2010reflex, 7.8 \u00b1 0.1 ms, <jats:italic>n<\/jats:italic> = 10) response that was recorded from the hind foot of anesthetized rats. Intraneural injection of serum antibodies from a MGUS patient with sensorimotor polyneuropathy, but not from an age\u2010matched control subject, produced a marked attenuation of the H\u2010reflex (<jats:italic>P<\/jats:italic> &lt; 0.01, <jats:italic>n<\/jats:italic> = 10) without affecting the M\u2010wave. Light and electron microscopy of affected nerve showed myelinoaxonal degeneration with sparing of the smaller unmyelinated nerve fibers. The combined electrophysiologic and morphologic findings presented in this study are consistent with a selective sensory conduction deficit in MGUS neuropathy. Selective injury of afferent nerve fibers by this patient's serum antibodies may result from reactivity to neural antigens uniquely expressed by sensory neurons. \u00a9 2001 John Wiley &amp; Sons, Inc. 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