E intraperitoneal space twice per day for 1 week. In seizure experienced rats, CQ or vehicle was injected at 2 hours after seizure, and then the CQ injection was continued twice per day for 1 week. Number of neuroblast was assessed by DCX immunohistochemistry. In the normal rats (without seizure), the number of DCX stained neurons in DG area is lower in CQ injected group than vehicle treated group. The number of DCX immunoreactive cells is significantly increased at 1 week after seizure compared to sham operated animals. However, CQ treated rats showed lower number of DCX immunoreactive cells in the DG of hippocampus compared to vehicle treated group after seizure (Fig. 6).Progenitor Cell and Neuroblast Proliferation in the Subgranular Zone of Dentate Gyrus is Reduced by TPEN in Normal and Post-seizure SubjectsTo test whether another zinc chelator, TPEN, also affects progenitor cell and neuroblast proliferation in the adult brain, rats were sacrificed 1 week after continuous TPEN Autophagy treatment with or without seizure. We found that group of 1 week TPEN treated rats also showed lower number of BrdU, Ki67 and DCX immunoreactive cells in the DG of hippocampus with or without seizure compared to vehicle treated group (Fig. 7).DiscussionThe present study Autophagy tested 
the hypothesis that brain zinc might play a modulatory role in hippocampal neurogenesis either in normal or in epilepsy-experienced rats. This study found that pharmacological zinc chelation substantially reduced basal or seizure-induced progenitor cell proliferation. The present studysuggests that vesicular zinc is an important mediator of neuronal regeneration in the hippocampus either under normal physiologic conditions or following brain insult. Chelatable zinc is highly concentrated in the mossy fiber of dentate granule cell of the hippocampus [24,25]. Excessive zinc translocation into postsynaptic neurons contributes to neuronal death in several disease conditions, such as prolonged seizures [26,27], ischemia [28,29], brain trauma [30,31] and hypoglycemia [32,33]. However, an equally abundant number of studies have shown that zinc has many beneficial or constitutive roles in the brain as well [15]. Zinc participates in the regulation of cell proliferation in several ways; it is essential to enzymatic functions that influence cell division and proliferation. Additionally, several studies have shown that zinc deficiency alters postnatal brain development [34]. Thus, the evidence outlined above confirms that zinc is an essential transition element in 
cell division and proliferation, and further suggests that zinc has a critical role in neurogenesis in the developing brain. The dentate granule (DG) cells have the unique property of prolonged postnatal neurogenesis within the hippocampal formation [35,36] [37]. 1527786 Hippocampal neurogenesis is continued through adulthood in the rodents [38,39,40,41]. Neuronal precursor cells reside in the SGZ of the dentate gyrus, where they proliferate continuously into the granule cell layer [41,42,43]. The precursor cells eventually develop granule cell morphology and begin to express markers of differentiated neurons [43,44]. In addition to lifelong physiological neurogenic properties, dentate granule cells are believe to be involved in the pathogenesis of temporal lobe epilepsy, one of the most common human seizure disorders [45,46,47]. After seizure, the dentate granule cells produce abnormal axonal projections to the supragranular inner molecular layer.E intraperitoneal space twice per day for 1 week. In seizure experienced rats, CQ or vehicle was injected at 2 hours after seizure, and then the CQ injection was continued twice per day for 1 week. Number of neuroblast was assessed by DCX immunohistochemistry. In the normal rats (without seizure), the number of DCX stained neurons in DG area is lower in CQ injected group than vehicle treated group. The number of DCX immunoreactive cells is significantly increased at 1 week after seizure compared to sham operated animals. However, CQ treated rats showed lower number of DCX immunoreactive cells in the DG of hippocampus compared to vehicle treated group after seizure (Fig. 6).Progenitor Cell and Neuroblast Proliferation in the Subgranular Zone of Dentate Gyrus is Reduced by TPEN in Normal and Post-seizure SubjectsTo test whether another zinc chelator, TPEN, also affects progenitor cell and neuroblast proliferation in the adult brain, rats were sacrificed 1 week after continuous TPEN treatment with or without seizure. We found that group of 1 week TPEN treated rats also showed lower number of BrdU, Ki67 and DCX immunoreactive cells in the DG of hippocampus with or without seizure compared to vehicle treated group (Fig. 7).DiscussionThe present study tested the hypothesis that brain zinc might play a modulatory role in hippocampal neurogenesis either in normal or in epilepsy-experienced rats. This study found that pharmacological zinc chelation substantially reduced basal or seizure-induced progenitor cell proliferation. The present studysuggests that vesicular zinc is an important mediator of neuronal regeneration in the hippocampus either under normal physiologic conditions or following brain insult. Chelatable zinc is highly concentrated in the mossy fiber of dentate granule cell of the hippocampus [24,25]. Excessive zinc translocation into postsynaptic neurons contributes to neuronal death in several disease conditions, such as prolonged seizures [26,27], ischemia [28,29], brain trauma [30,31] and hypoglycemia [32,33]. However, an equally abundant number of studies have shown that zinc has many beneficial or constitutive roles in the brain as well [15]. Zinc participates in the regulation of cell proliferation in several ways; it is essential to enzymatic functions that influence cell division and proliferation. Additionally, several studies have shown that zinc deficiency alters postnatal brain development [34]. Thus, the evidence outlined above confirms that zinc is an essential transition element in cell division and proliferation, and further suggests that zinc has a critical role in neurogenesis in the developing brain. The dentate granule (DG) cells have the unique property of prolonged postnatal neurogenesis within the hippocampal formation [35,36] [37]. 1527786 Hippocampal neurogenesis is continued through adulthood in the rodents [38,39,40,41]. Neuronal precursor cells reside in the SGZ of the dentate gyrus, where they proliferate continuously into the granule cell layer [41,42,43]. The precursor cells eventually develop granule cell morphology and begin to express markers of differentiated neurons [43,44]. In addition to lifelong physiological neurogenic properties, dentate granule cells are believe to be involved in the pathogenesis of temporal lobe epilepsy, one of the most common human seizure disorders [45,46,47]. After seizure, the dentate granule cells produce abnormal axonal projections to the supragranular inner molecular layer.