Reduced densities of sodium-dependent [3H] hemicholinium-3 binding sites in hippocampus of developmental rats following perinatal low-level lead exposure.
We investigated the effect of perinatal, low-level lead exposure on [3H]hemicholinium-3 (HC-3) binding in the hippocampus of postnatal rat. Rat pups were maternally lead-exposed from gestational day 16 through postnatal day 28 (PN28). In control animals, the [3H]HC-3 binding sites increased from 7 fmol/mg protein at postnatal day 1 (PN1) to 14 and 35 fmol/mg protein at PN7 and PN14, respectively, and reached adult values of 50 fmol/mg protein, at PN21 and PN28. In lead-exposed litters, the [3H]HC-3 binding was reduced by 30-40% throughout the early postnatal development and remained 40% below control values in PN60 animals, one month after termination of lead exposure. The Pb-induced reduction in HC-3 binding was associated with a similar decrease in ChAT activity and was comparable to the effect of localized lesion of medial septum. Septal cell counts in the lead-exposed PN21 rats indicated a 22% reduction in the number of ChAT-immunoreactive cells in the medial septum/vertical diagonal band (MS/vDB) complex although cell numbers in the horizontal limb of the diagonal band (hDB) were not altered. These results suggest that perinatal, low-level lead exposure results in a reduced density of cholinergic nerve terminals in the hippocampus, either due to impaired development or degeneration of the cholinergic projection neurons in the MS/vDB complex.
Tian
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Department of Molecular and Cellular Physiology, College of Medicine, University of Cincinnati, OH 45267-0576, USA.
Bourjeily
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N
Bielarczyk
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H
Suszkiw
J B
JB
D000375:Aging / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D001665:Binding Sites; D002795:Choline O-Acetyltransferase / Q000378:metabolism; D005314:Embryonic and Fetal Development; D005333:Fetus / Q000378:metabolism*; D006426:Hemicholinium 3 / Q000378:metabolism*; D006624:Hippocampus / Q000196:embryology* / Q000378:metabolism*; D007854:Lead / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012688:Septum Pellucidum / Q000196:embryology; D012964:Sodium / Q000502:physiology*; D014316:Tritium
D014316:Tritium; D007854:Lead; D006426:Hemicholinium 3; D012964:Sodium; D002795:Choline O-Acetyltransferase