Spatial distribution of nociceptive neuropeptide and nerve growth factor depletion in experimental diabetic peripheral nervous system.
This study investigated the time-course of the nociceptive neuropeptide substance P and nerve growth factor (NGF), which facilitates substance P production, in lumbar and cervical dorsal root ganglia (DRG) of streptozotocin-induced diabetic rats. Levels of substance P and NGF were measured by radioimmunoassay and sandwich enzyme-linked immunosorbent assay, respectively, 2 months, 4 months and 8 months after induction of diabetes, and compared with age-matched non-diabetic control rats. At 2 months and 4 months, substance P and NGF levels were lower in the lumbar DRG of the diabetic rats than in controls. At 8 months, substance P and NGF were lower in both the lumbar and cervical DRG of the diabetic rats than in controls. These data demonstrate that a decrease in substance P levels in primary sensory neurons with NGF depletion occurs in an axonal length-dependent manner in diabetic rats, and that this decrease may be correlated with the duration of diabetes.
Kanbayashi
H
H
Second Department of Internal Medicine, Asahikawa Medical College, Midorigaoka-higashi 2-1-1-1, Asahikawa 078-8510, Japan.
Itoh
H
H
Kashiwaya
T
T
Atoh
K
K
Makino
I
I
D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D003921:Diabetes Mellitus, Experimental / Q000097:blood / Q000378:metabolism*; D003929:Diabetic Neuropathies / Q000209:etiology / Q000378:metabolism; D005727:Ganglia, Spinal / Q000378:metabolism*; D006442:Glycated Hemoglobin / Q000378:metabolism; D008161:Lumbosacral Region; D008297:Male; D009333:Neck; D020932:Nerve Growth Factor / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D013373:Substance P / Q000378:metabolism*
D001786:Blood Glucose; D006442:Glycated Hemoglobin; D020932:Nerve Growth Factor; D013373:Substance P