Neuronal subpopulations of developing rat hippocampus containing differentcalcium-binding proteins behave distinctively in trimethyltin-induced neurodegeneration
Mc. Geloso et al., Neuronal subpopulations of developing rat hippocampus containing differentcalcium-binding proteins behave distinctively in trimethyltin-induced neurodegeneration, EXP NEUROL, 154(2), 1998, pp. 645-653
The present study investigates, by immunocytochemistry, the behavior of dif
ferent neuronal subpopulations of the developing rat hippocampus, selective
ly labeled by the calcium-binding proteins calbindin D28-k (CB), parvalbumi
n (PV), and calretinin (CR), in neurodegenerative processes induced by the
neurotoxicant trimethyltin (TMT). Previous studies on adult rats indicated
that CB-immunoreactive (IR) neurons were affected by TMT, while PV- and CR-
IR neurons were selectively spared. The present findings show that only CR-
IR neurons are spared in developing rats, and in addition the number of CR-
IR neurons are significantly higher in the DG of treated animals. On the co
ntrary, PV-IR neurons, spared in adult rats, were affected by TMT during de
velopment. CB-IR neurons were affected also in developing rats, as in adult
s. The different postnatal time-courses of calcium-binding protein expressi
on in relationship to the time of TMT administration (presence of CR but ab
sence of PV) could have a role in the different behavior of CR- and PV-IR c
ells in developing rats. (C) 1998 Academic Press.