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He Z. Selective effects of perinatal estrogen on proliferation and new neurons in hippocampus and piriform cortex of rats at weaning. Neurotoxicology 2022; 91:254-261. [PMID: 35618077 DOI: 10.1016/j.neuro.2022.05.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 05/17/2022] [Accepted: 05/17/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND A recent report links heightened prenatal amniotic estrogen levels to an increased risk of autism spectrum disorder (ASD). In this study, we examined the developmental effects of perinatal estrogen treatment on stem cell activity in weaned rats. METHODS Sprague-Dawley rats received ethinyl estradiol (EE2, 10µg/kg/day) or vehicle orally from gestational day 6 until parturition. Offspring were then treated with the same daily dose from postnatal days (PNDs) 1-21. The effects of perinatal estrogen treatment on stem cell activities in the subgranular zone (SGZ) of the hippocampus and the piriform cortex were evaluated in male and female rat pups. RESULTS EE2 treatment increased the total Ki67-immunoreactive (Ki67-ir) cell counts in the SGZ of males and females (p<0.05). However, no treatment or sex differences were detectable in the density of the doublecortin (DCX)-immunoreactive (DCX-ir) deposits in the hippocampus. In the piriform cortex, no treatment or sex differences were detected in Ki67-ir cell counts. However, the EE2 treatment significantly reduced the DCX-ir cell count in male, but not female rats (male EE2 group=292±22/mm2, male vehicle group=402±19/mm2, female EE2 group=342±15/mm2, female vehicle group=331±9/mm2). CONCLUSIONS Perinatal estrogen treatment increased hippocampal Ki67-ir cell counts in both sexes and selectively reduced DCX-ir cell counts in the piriform cortex of males. These data suggest that exposure to abnormally high levels of estrogens early in life may have an impact on neural cell development. Alterations in development so early in life may have long-term cognitive impact.
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Affiliation(s)
- Z He
- Division of Neurotoxicology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR 72079 USA.
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Late effect of developmental exposure to glycidol on hippocampal neurogenesis in mice: Loss of parvalbumin-expressing interneurons. ACTA ACUST UNITED AC 2017; 69:517-526. [PMID: 28495474 DOI: 10.1016/j.etp.2017.04.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Accepted: 04/16/2017] [Indexed: 12/11/2022]
Abstract
Developmental exposure to glycidol of rats causes axonal injury targeting axon terminals in dams and transient disruption of late-stage differentiation of hippocampal neurogenesis, accompanying sustained increase in the number of reelin-producing or calretinin-expressing interneurons in offspring. The molecular mechanism of disruptive neurogenesis probably targets the newly generating nerve terminals. We previously found differences between mice and rats in the effects on hippocampal neurogenesis after developmental exposure to the same neurotoxic substances. In the present study, we examined the effects and underlying mechanisms of developmental exposure to glycidol on hippocampal neurogenesis in mice. Glycidol (800 or 1600ppm) was administered in drinking water to mated female mice from gestational day 6 to postnatal day 21. Compared to mice drinking water without glycidol (control), the exposed dams showed axon terminal injury at both concentrations of glycidol. The offspring of the dams that had received 1600ppm glycidol had fewer parvalbumin (PVALB)+ γ-aminobutyric acid (GABA)-ergic interneurons and neuron-specific nuclear protein+ postmitotic neurons in the hilus of the hippocampal dentate gyrus. Thus, exposure of glycidol to adult mice induced axonal degeneration equivalent to that seen in the rat; however, the target mechanism for the disruption of hippocampal neurogenesis by developmental exposure was different from that in rats, with the hilar neuronal population not affected until adulthood. Considering the role of PVALB+ GABAergic interneurons in the brain, developmental glycidol exposure in mice may cause a decline in cognitive function in later life, and involve a different mechanism from that targeting axon terminals in rats.
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Kato M, Abe H, Itahashi M, Kikuchihara Y, Kimura M, Mizukami S, Yoshida T, Shibutani M. Maternal exposure to hexachlorophene targets intermediate-stage progenitor cells in the hippocampal neurogenesis involving myelin vacuolation of cholinergic and glutamatergic inputs in mice. J Appl Toxicol 2015; 36:211-22. [PMID: 25943520 DOI: 10.1002/jat.3162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 03/16/2015] [Accepted: 03/16/2015] [Indexed: 11/11/2022]
Abstract
Hexachlorophene (HCP) has been shown to induce myelin vacuolation due to intramyelinic edema of the nerve fibers in animal neural tissue. We investigated the maternal exposure effect of HCP on hippocampal neurogenesis in the offspring of pregnant mice supplemented with 0 (control), 33 or 100 ppm HCP in diet from gestational day 6 to day 21 after delivery. On postnatal day (PND) 21, offspring as examined in males exhibited decreased granule cell lineage populations expressing paired box 6, sex-determining region Y-box 2 and eomesodermin in the hippocampal subgranular zone (SGZ) accompanied by myelin vacuolation involving white matter tracts of the hippocampal fimbria at ≥ 33 ppm. However, SGZ cellular populations expressing brain lipid binding protein and doublecortin were unchanged at any dose. Transcript expression of cholinergic receptor genes, Chrna4 and Chrnb2, and glutamate receptor genes, Grm1 and Grin2d, examined at 100 ppm, decreased in the dentate gyrus. HCP exposure did not alter the number of proliferating or apoptotic cells in the SGZ, or reelin- or calcium-binding protein-expressing γ-aminobutyric acid (GABA)ergic interneurons in the dentate hilus, on PND 21 and PND 77. All neurogenesis-related changes observed in HCP-exposed offspring on PND 21 disappeared on PND 77, suggesting that maternal HCP exposure at ≥ 33 ppm reversibly decreased type 2 intermediate-stage progenitor cells in the hippocampal neurogenesis. Myelin vacuolation might be responsible for changes in neurogenesis possibly by reducing nerve conduction velocity of cholinergic inputs from the septal-hippocampal pathway to granule cell lineages and/or GABAergic interneurons, and of glutamatergic inputs to granule cell lineages.
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Affiliation(s)
- Mizuho Kato
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan
| | - Hajime Abe
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan.,Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences, Gifu University, Gifu-shi, Gifu, Japan
| | - Megu Itahashi
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan.,Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences, Gifu University, Gifu-shi, Gifu, Japan
| | - Yoh Kikuchihara
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan
| | - Masayuki Kimura
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan.,Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences, Gifu University, Gifu-shi, Gifu, Japan
| | - Sayaka Mizukami
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan.,Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences, Gifu University, Gifu-shi, Gifu, Japan
| | - Toshinori Yoshida
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan
| | - Makoto Shibutani
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo, Japan
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Abe H, Tanaka T, Kimura M, Mizukami S, Imatanaka N, Akahori Y, Yoshida T, Shibutani M. Developmental exposure to cuprizone reduces intermediate-stage progenitor cells and cholinergic signals in the hippocampal neurogenesis in rat offspring. Toxicol Lett 2015; 234:180-93. [DOI: 10.1016/j.toxlet.2015.01.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Revised: 01/11/2015] [Accepted: 01/29/2015] [Indexed: 11/28/2022]
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Itahashi M, Abe H, Tanaka T, Mizukami S, Kimura M, Yoshida T, Shibutani M. Maternal exposure to hexachlorophene targets intermediate-stage progenitor cells of the hippocampal neurogenesis in rat offspring via dysfunction of cholinergic inputs by myelin vacuolation. Toxicology 2015; 328:123-34. [DOI: 10.1016/j.tox.2014.12.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 12/07/2014] [Accepted: 12/09/2014] [Indexed: 10/24/2022]
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Itahashi M, Abe H, Tanaka T, Mizukami S, Kikuchihara Y, Yoshida T, Shibutani M. Maternal exposure to 3,3’-iminodipropionitrile targets late-stage differentiation of hippocampal granule cell lineages to affect brain-derived neurotrophic factor signaling and interneuron subpopulations in rat offspring. J Appl Toxicol 2014; 35:884-94. [DOI: 10.1002/jat.3086] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 09/23/2014] [Accepted: 09/24/2014] [Indexed: 01/13/2023]
Affiliation(s)
- Megu Itahashi
- Laboratory of Veterinary Pathology; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho, Fuchu-shi Tokyo 183-8509 Japan
- Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences; Gifu University; 1-1 Yanagido, Gifu-shi Gifu 501-1193 Japan
| | - Hajime Abe
- Laboratory of Veterinary Pathology; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho, Fuchu-shi Tokyo 183-8509 Japan
- Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences; Gifu University; 1-1 Yanagido, Gifu-shi Gifu 501-1193 Japan
| | - Takeshi Tanaka
- Laboratory of Veterinary Pathology; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho, Fuchu-shi Tokyo 183-8509 Japan
- Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences; Gifu University; 1-1 Yanagido, Gifu-shi Gifu 501-1193 Japan
| | - Sayaka Mizukami
- Laboratory of Veterinary Pathology; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho, Fuchu-shi Tokyo 183-8509 Japan
- Pathogenetic Veterinary Science, United Graduate School of Veterinary Sciences; Gifu University; 1-1 Yanagido, Gifu-shi Gifu 501-1193 Japan
| | - Yoh Kikuchihara
- Laboratory of Veterinary Pathology; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho, Fuchu-shi Tokyo 183-8509 Japan
| | - Toshinori Yoshida
- Laboratory of Veterinary Pathology; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho, Fuchu-shi Tokyo 183-8509 Japan
| | - Makoto Shibutani
- Laboratory of Veterinary Pathology; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho, Fuchu-shi Tokyo 183-8509 Japan
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