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Su FC, Wei YC, Sun CY, Hsu HJ, Lee CC, Chen YT, Pan HC, Hsu CK, Liu YA, Chen CY. Endocrine-Disrupting Chemicals Exposure and Neurocognitive Function in the General Population: A Community-Based Study. TOXICS 2024; 12:514. [PMID: 39058166 PMCID: PMC11281080 DOI: 10.3390/toxics12070514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2024] [Revised: 07/12/2024] [Accepted: 07/15/2024] [Indexed: 07/28/2024]
Abstract
BACKGROUND Endocrine-disrupting chemicals (EDCs) are pervasive in everyday environments. The impacts of these chemicals, along with EDC-related lifestyle and dietary habits on neurocognitive function, are not well understood. METHODS The Chang Gung Community Medicine Research Center conducted a cross-sectional study involving 887 participants. From this initial cohort, 120 individuals were selected based on their EDC exposure scores for detailed analysis. Among these, 67 participants aged 55 years or older were further chosen to undergo cognitive impairment assessments using the Ascertain Dementia-8 (AD-8) questionnaire. RESULTS These 67 older participants did not significantly differ in age, albuminuria, or estimated glomerular filtration rate compared to those with lower impairment scores. This study revealed that mono-(2-ethylhexyl) phthalate (MEHP) levels (8.511 vs. 6.432 µg/g creatinine, p = 0.038) were associated with greater risk of cognitive impairment (AD-8 ≥ 2). Statistical models adjusting for age, gender, and diabetes indicated that MEHP levels positively correlated with AD-8 scores, achieving statistical significance in more comprehensive models (β ± SE: 0.160 ± 0.076, p = 0.042). Logistic regression analysis underscored a significant positive association between high MEHP levels and higher AD-8 scores (odds ratio: 1.217, p = 0.006). Receiver operating characteristic curves highlighted the association of high MEHP levels and EDC exposure scores for significant cognitive impairment, with areas under the curve of 66.3% and 66.6%, respectively. CONCLUSION Exposure to EDCs, specifically di-(2-ethylhexyl) phthalate, the precursor to MEHP, may be associated with neurocognitive impairment in middle-aged and older adults.
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Affiliation(s)
- Feng-Chieh Su
- Department of Neurology, Chang Gung Memorial Hospital, Keelung 204, Taiwan; (F.-C.S.); (Y.-C.W.)
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
| | - Yi-Chia Wei
- Department of Neurology, Chang Gung Memorial Hospital, Keelung 204, Taiwan; (F.-C.S.); (Y.-C.W.)
- School of Traditional Chinese Medicine, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Chiao-Yin Sun
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Heng-Jung Hsu
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Chin-Chan Lee
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Yih-Ting Chen
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Heng-Chih Pan
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Cheng-Kai Hsu
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Yun-An Liu
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
| | - Chun-Yu Chen
- College of Medicine, Chang Gung University, Taoyuan 333, Taiwan; (C.-Y.S.); (H.-J.H.); (C.-C.L.); (Y.-T.C.); (H.-C.P.); (C.-K.H.); (Y.-A.L.)
- Community Medicine Research Center, Chang Gung Memorial Hospital, Keelung 204, Taiwan
- Department of Nephrology, Chang Gung Memorial Hospital, Keelung 204, Taiwan
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2
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Lymer J, Bergman H, Yang S, Mallick R, Galea LAM, Choleris E, Fergusson D. The effects of estrogens on spatial learning and memory in female rodents - A systematic review and meta-analysis. Horm Behav 2024; 164:105598. [PMID: 38968677 DOI: 10.1016/j.yhbeh.2024.105598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 06/01/2024] [Accepted: 06/19/2024] [Indexed: 07/07/2024]
Abstract
Estrogens have inconsistent effects on learning and memory in both the clinical and preclinical literature. Preclinical literature has the advantage of investigating an array of potentially important factors contributing to the varied effects of estrogens on learning and memory, with stringently controlled studies. This study set out to identify specific factors in the animal literature that influence the effects of estrogens on cognition, for possible translation back to clinical practice. The literature was screened and studies meeting strict inclusion criteria were included in the analysis. Eligible studies included female ovariectomized rodents with an adequate vehicle for the estrogen treatment, with an outcome of spatial learning and memory in the Morris water maze. Training days of the Morris water maze were used to assess acquisition of spatial learning, and the probe trial was used to evaluate spatial memory recall. Continuous outcomes were pooled using a random effects inverse variance method and reported as standardized mean differences with 95 % confidence intervals. Subgroup analyses were developed a priori to assess important factors. The overall analysis favoured treatment for the later stages of training and for the probe trial. Factors including the type of estrogen, route, schedule of administration, age of animals, timing relative to ovariectomy, and duration of treatment were all found to be important. The subgroup analyses showed that chronic treatment with 17β-estradiol, either cyclically or continuously, to young animals improved spatial recall. These results, observed in animals, can inform and guide further clinical research on hormone replacement therapy for cognitive benefits.
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Affiliation(s)
- Jennifer Lymer
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada; Division of Neurology, Department of Medicine, The Ottawa Hospital, Ottawa, ON, Canada.
| | - Hailey Bergman
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada.
| | - Sabrina Yang
- Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada.
| | | | - Liisa A M Galea
- Department of Psychiatry, University of Toronto, ON, Canada; Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada.
| | - Elena Choleris
- Department of Psychology and Neuroscience Program, University of Guelph, Guelph, ON, Canada.
| | - Dean Fergusson
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada; Department of Medicine, University of Ottawa, Ottawa, ON, Canada.
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3
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Christensen A, Liu J, Pike CJ. Aging Reduces Estradiol Protection Against Neural but Not Metabolic Effects of Obesity in Female 3xTg-AD Mice. Front Aging Neurosci 2020; 12:113. [PMID: 32431604 PMCID: PMC7214793 DOI: 10.3389/fnagi.2020.00113] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 04/03/2020] [Indexed: 12/29/2022] Open
Abstract
Vulnerability to Alzheimer's disease (AD) is increased by several risk factors, including midlife obesity, female sex, and the depletion of estrogens in women as a consequence of menopause. Conversely, estrogen-based hormone therapies have been linked with protection from age-related increases in adiposity and dementia risk, although treatment efficacy appears to be affected by the age of initiation. Potential interactions between obesity, AD, aging, and estrogen treatment are likely to have significant impact on optimizing the use of hormone therapies in postmenopausal women. In the current study, we compared how treatment with the primary estrogen, 17β-estradiol (E2), affects levels of AD-like neuropathology, behavioral impairment, and other neural and systemic effects of preexisting diet-induced obesity in female 3xTg-AD mice. Importantly, experiments were conducted at chronological ages associated with both the early and late stages of reproductive senescence. We observed that E2 treatment was generally associated with significantly improved metabolic outcomes, including reductions in body weight, adiposity, and leptin, across both age groups. Conversely, neural benefits of E2 in obese mice, including decreased β-amyloid burden, improved behavioral performance, and reduced microglial activation, were observed only in the early aging group. These results are consistent with the perspective that neural benefits of estrogen-based therapies require initiation of treatment during early rather than later phases of reproductive aging. Further, the discordance between E2 protection against systemic versus neural effects of obesity across age groups suggests that pathways other than general metabolic function, perhaps including reduced microglial activation, contribute to the mechanism(s) of the observed E2 actions. These findings reinforce the potential systemic and neural benefits of estrogen therapies against obesity, while also highlighting the critical role of aging as a mediator of estrogens' protective actions.
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Affiliation(s)
| | | | - Christian J. Pike
- Davis School of Gerontology, University of Southern California, Los Angeles, CA, United States
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4
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Beneficial effects of tamoxifen on leptin sensitivity in young mice fed a high fat diet: Role of estrogen receptor α and cytokines. Life Sci 2020; 246:117384. [PMID: 32061672 DOI: 10.1016/j.lfs.2020.117384] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 01/26/2020] [Accepted: 01/28/2020] [Indexed: 01/02/2023]
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5
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de Quadros VP, Tobar N, Viana LR, Dos Santos RW, Kiyataka PHM, Gomes-Marcondes MCC. The 17β-oestradiol treatment minimizes the adverse effects of protein restriction on bone parameters in ovariectomized Wistar rats: Relevance to osteoporosis and the menopause. Bone Joint Res 2020; 8:573-581. [PMID: 31934328 PMCID: PMC6946913 DOI: 10.1302/2046-3758.812.bjr-2018-0259.r2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Objectives Insufficient protein ingestion may affect muscle and bone mass, increasing the risk of osteoporotic fractures in the elderly, and especially in postmenopausal women. We evaluated how a low-protein diet affects bone parameters under gonadal hormone deficiency and the improvement led by hormone replacement therapy (HRT) with 17β-oestradiol. Methods Female Wistar rats were divided into control (C), ovariectomized (OVX), and 17β-oestradiol-treated ovariectomized (OVX-HRT) groups, which were fed a control or an isocaloric low-protein diet (LP; 6.6% protein; seven animals per group). Morphometric, serum, and body composition parameters were assessed, as well as bone parameters, mechanical resistance, and mineralogy. Results The results showed that protein restriction negatively affected body chemical composition and bone metabolism by the sex hormone deficiency condition in the OVX group. The association between undernutrition and hormone deficiency led to bone and muscle mass loss and increased the fragility of the bone (as well as decreasing relative femoral weight, bone mineral density, femoral elasticity, peak stress, and stress at offset yield). Although protein restriction induced more severe adverse effects compared with the controls, the combination with HRT showed an improvement in minimizing these damaging effects, as it was seen that HRT had some efficacy in maintaining muscle and bone mass, preserving the bone resistance and minimizing some deleterious processes during the menopause. Conclusion Protein restriction has adverse effects on metabolism, leading to more severe menopausal symptoms, and HRT could minimize these effects. Therefore, special attention should be given to a balanced diet during menopause and HRT.Cite this article: Bone Joint Res 2019;8:573-581.
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Affiliation(s)
- Victoria P de Quadros
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas (UNICAMP), Campinas, Brazil
| | - Natalia Tobar
- Nuclear Medicine Service, the Clinical Hospital of UNICAMP, Campinas, Brazil
| | - Lais R Viana
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas (UNICAMP), Campinas, Brazil
| | - Rogerio W Dos Santos
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas (UNICAMP), Campinas, Brazil
| | - Paulo H M Kiyataka
- Packaging Technology Centre (Cetea) from the Institute of Food Technology (ITAL) of Campinas, Campinas, Brazil
| | - Maria C C Gomes-Marcondes
- Laboratory of Nutrition and Cancer, Department of Structural and Functional Biology, Biology Institute, University of Campinas (UNICAMP), Campinas, Brazil
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6
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Ren X, Boriero D, Chaiswing L, Bondada S, St Clair DK, Butterfield DA. Plausible biochemical mechanisms of chemotherapy-induced cognitive impairment ("chemobrain"), a condition that significantly impairs the quality of life of many cancer survivors. Biochim Biophys Acta Mol Basis Dis 2019; 1865:1088-1097. [PMID: 30759363 PMCID: PMC6502692 DOI: 10.1016/j.bbadis.2019.02.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 02/05/2019] [Accepted: 02/07/2019] [Indexed: 12/13/2022]
Abstract
Increasing numbers of cancer patients survive and live longer than five years after therapy, but very often side effects of cancer treatment arise at same time. One of the side effects, chemotherapy-induced cognitive impairment (CICI), also called "chemobrain" or "chemofog" by patients, brings enormous challenges to cancer survivors following successful chemotherapeutic treatment. Decreased abilities of learning, memory, attention, executive function and processing speed in cancer survivors with CICI, are some of the challenges that greatly impair survivors' quality of life. The molecular mechanisms of CICI involve very complicated processes, which have been the subject of investigation over the past decades. Many mechanistic candidates have been studied including disruption of the blood-brain barrier (BBB), DNA damage, telomere shortening, oxidative stress and associated inflammatory response, gene polymorphism of neural repair, altered neurotransmission, and hormone changes. Oxidative stress is considered as a vital mechanism, since over 50% of FDA-approved anti-cancer drugs can generate reactive oxygen species (ROS) or reactive nitrogen species (RNS), which lead to neuronal death. In this review paper, we discuss these important candidate mechanisms, in particular oxidative stress and the cytokine, TNF-alpha and their potential roles in CICI.
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Affiliation(s)
- Xiaojia Ren
- Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
| | - Diana Boriero
- Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA; Department of Neurosciences, Biomedicine, and Movement Disorders, Section on Biological Chemistry, University of Verona, 37134 Verona, Italy
| | - Luksana Chaiswing
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA; Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536, USA
| | - Subbarao Bondada
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA; Department of Microbiology, Immunology & Molecular Genetics, University of Kentucky, Lexington, KY 40536, USA
| | - Daret K St Clair
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA; Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536, USA
| | - D Allan Butterfield
- Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA; Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA.
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7
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Heng Li S, Wang LT, Deng X, NanJiao Y, Kong L, Fu M, Jia LQ, Yang JX, Ren L. Electroacupuncture Rescued the Impairment of Hippocampal Neurons in Perimenopausal Depression Rats via Activating the CREB/BDNF Pathway. INT J PHARMACOL 2018. [DOI: 10.3923/ijp.2018.164.178] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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8
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He Q, Luo Y, Lv F, Xiao Q, Chao F, Qiu X, Zhang L, Gao Y, Xiu Y, Huang C, Tang Y. Effects of estrogen replacement therapy on the myelin sheath ultrastructure of myelinated fibers in the white matter of middle-aged ovariectomized rats. J Comp Neurol 2017; 526:790-802. [PMID: 29205359 DOI: 10.1002/cne.24366] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 11/22/2017] [Accepted: 11/24/2017] [Indexed: 12/17/2022]
Abstract
The effects of estrogen replacement therapy (ORT) on white matter and the myelin sheath ultrastructure in the white matter of middle-aged ovariectomized (OVX) rats were investigated in this study. Middle-aged rats were ovariectomized and divided into a placebo replacement (OVX + O) group and an estrogen replacement (OVX + E) group. Then, the Morris water maze, electron microscope techniques, and stereological methods were used to investigate the effects of ORT on spatial learning capacity, white matter volume and the myelin sheath ultrastructure in the white matter. We found that the spatial learning capacity of the OVX + E rats was significantly improved compared with that of the OVX + O rats. When compared with that of OVX + O rats, the total volume of the myelin sheaths in the white matter of the OVX + E rats was significantly increased by 27%, and the difference between the outer perimeter and inner perimeter of the myelin sheaths of the white matter in the OVX + E rats increased significantly by 12.6%. The myelinated fibers with mean diameters of 1.2-1.4 μm were significantly longer (46.1%) in the OVX + E rats; the difference between the mean diameter of myelinated fibers and the mean diameter of axons (0-0.4 μm) was significantly increased by 21.6% in the OVX + E rats. These results suggested that ORT had positive protective effects on the spatial learning ability and on the myelin sheath ultrastructure in the white matter of middle-aged OVX rats.
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Affiliation(s)
- Qi He
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Yanmin Luo
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Fulin Lv
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Qian Xiao
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Fenglei Chao
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Xuan Qiu
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China.,Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing, P. R. China
| | - Lei Zhang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
| | - Yuan Gao
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China.,Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, P. R. China
| | - Yun Xiu
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Institute of Life Science, Chongqing Medical University, Chongqing, P. R. China
| | - Chunxia Huang
- Department of Physiology, Chongqing Medical University, Chongqing, P. R. China
| | - Yong Tang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, P. R. China.,Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, P. R. China
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9
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Ristic N, Ajdzanovic V, Manojlovic-Stojanoski M, Maliković J, Uscebrka G, Markovic Z, Milosevic V. Effects of Estradiol on Histological Parameters and Secretory Ability of Pituitary Mammotrophs in Ovariectomized Female Rats. CELL JOURNAL 2017; 19:461-468. [PMID: 28836408 PMCID: PMC5570411 DOI: 10.22074/cellj.2017.4334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 08/16/2016] [Indexed: 01/02/2023]
Abstract
Objective Estrogen replacement therapy remains current as a therapeutic approach to
treat menopausal symptoms and may significantly affect hormone-producing cells in the
female pituitaries. The aim of this study was to examine the histological parameters of
pituitary mammotrophs and prolactin secretion after chronic estradiol treatment in ovariectomized adult female rats, reflecting premature menopause. Materials and Methods In this experimental study, adult female Wistar rats were divided into non-ovariectomized (C),
ovariectomized (OVX) and estradiol-treated ovariectomized (OVX+E) groups. Estradiol dipropionate [0.625 mg/kg body mass per
day] was administered for four weeks, while the C and OVX groups received vehicle
alone. Mammotrophs were identified by the peroxidase-antiperoxidase (PAP) immunohistochemical procedure, while prolactin concentrations were measured by the
non-isotopic two-step assay (Delfia) method. Comparison of the differences between
groups was performed using one-way analysis of variance (ANOVA) and Tukay (honest significant difference) HSD test.
Results Ovariectomy caused significant (P<0.05) decreases in mammotroph optical
density (OD), volume density (VV) and number per mm2 by 29, 27 and 34%, respectively, in comparison with the C females. In the OVX+E group, significant (P<0.05)
increases in OD, cell volume, VVand number of mammotrophs per mm2 by 181, 15%,
5.8-fold and 5.2-fold, respectively, were observed when compared to OVX animals.
The serum prolactin concentration in OVX females was significantly (P<0.05) decreased by 14% in comparison to the C group, while in OVX+E females, prolactin
levels were significantly (P<0.05) increased by 53% compared to the OVX controls. Conclusion Estradiol supplementation in ovariectomized females is followed by
stimulatory histological and secretory changes of the mammotrophs. These results
could serve as indicators of possible prolactinome development upon estradiol application in premature menopausal subjects.
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Affiliation(s)
- Natasa Ristic
- Department of Cytology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Belgrade, Serbia.
| | - Vladimir Ajdzanovic
- Department of Cytology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Belgrade, Serbia.
| | - Milica Manojlovic-Stojanoski
- Department of Cytology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Belgrade, Serbia
| | - Jovana Maliković
- Department of Cytology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Belgrade, Serbia
| | - Gordana Uscebrka
- Department of Veterinary Medicine, Faculty of Agriculture, University of Novi Sad, Novi Sad, Serbia
| | | | - Verica Milosevic
- Department of Cytology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Belgrade, Serbia
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10
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Zhang Y, Chao FL, Zhou CN, Jiang L, Zhang L, Chen LM, Luo YM, Xiao Q, Tang Y. Effects of exercise on capillaries in the white matter of transgenic AD mice. Oncotarget 2017; 8:65860-65875. [PMID: 29029478 PMCID: PMC5630378 DOI: 10.18632/oncotarget.19505] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 06/30/2017] [Indexed: 02/06/2023] Open
Abstract
Previous studies have shown that exercise can prevent white matter atrophy in APP/PS1 transgenic Alzheimer’s disease (AD) mice. However, the mechanism of this protective effect remains unknown. To further understand this issue, we investigated the effects of exercise on the blood supply of white matter in transgenic AD mice. Six-month-old male APP/PS1 mice were randomly divided into a control group and a running group, and age-matched non-transgenic littermates were used as a wild-type control group. Mice in the running group ran on a treadmill at low intensity for four months. Then, spatial learning and memory abilities, white matter and white matter capillaries were examined in all mice. The 10-month-old AD mice exhibited deficits in cognitive function, and 4 months of exercise improved these deficits. The white matter volume and the total length, total volume and total surface area of the white matter capillaries were decreased in the 10-month-old AD mice, and 4 months of exercise dramatically delayed the changes in these parameters in the AD mice. Our results demonstrate that even low-intensity running exercise can improve spatial learning and memory abilities, delay white matter atrophy and protect white matter capillaries in early-stage AD mice. Protecting capillaries might be an important structural basis for the exercise-induced protection of the structural integrity of white matter in AD.
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Affiliation(s)
- Yi Zhang
- Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing 400016, PR China.,Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Feng-Lei Chao
- Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Chun-Ni Zhou
- Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing 400016, PR China.,Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Lin Jiang
- Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing 400016, PR China.,Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Lei Zhang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Lin-Mu Chen
- Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Yan-Min Luo
- Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing 400016, PR China.,Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Qian Xiao
- Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing 400016, PR China.,Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
| | - Yong Tang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing 400016, PR China.,Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing 400016, PR China
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Stires H, Saboya M, Globerman SP, Cohick WS. Peroral Estradiol Is Sufficient to Induce Carcinogen-Induced Mammary Tumorigenesis in Ovariectomized Rats without Progesterone. PLoS One 2016; 11:e0162662. [PMID: 27611094 PMCID: PMC5017759 DOI: 10.1371/journal.pone.0162662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 08/28/2016] [Indexed: 12/02/2022] Open
Abstract
A role for estrogens in breast cancer is widely accepted, however, recent evidence highlights that timing and exposure levels are important in determining whether they elicit harmful versus beneficial effects. The rat chemical carcinogen model has been widely used to study the effects of estrogens but conclusions on the levels that lead to tumor development and an absolute requirement for progesterone (P4) are lacking. A newer method of hormone administration mixes hormones with nut butter for peroral consumption allowing for a less stressful method of long-term administration with lower spikes in serum estradiol (E2) levels. The present study was designed to determine if estrogens alone at a physiological dose can drive carcinogen-induced tumors in ovariectomized (OVX) rats or if P4 is also required using this method of hormone administration. Short-term studies were conducted to determine the dose of estrogen (E) that would lead to increased uterine weight following OVX. Subsequently, rats were OVX on postnatal day (PND) 40 then treated daily with E (600 μg/kg/day), P4 (15 mg/kg/day), or the combination. On PND 50, all rats were injected with nitrosomethylurea to induce mammary tumors. Uterine weights, body weights, and serum E2 levels were measured to demonstrate the efficacy of the method for increasing E2 levels during long-term treatment. After 26 weeks, tumor incidence was similar in Sham, E, and E + P4 animals indicating that E was sufficient to induce tumorigenesis when hormone levels were normalized by this method. This study demonstrates peroral administration can be used in long-term studies to elucidate relationships between different types and levels of steroid hormones.
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Affiliation(s)
- Hillary Stires
- Department of Animal Science, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States of America
| | - Mariana Saboya
- Department of Animal Science, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States of America
| | - Samantha P. Globerman
- Department of Animal Science, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States of America
| | - Wendie S. Cohick
- Department of Animal Science, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States of America
- * E-mail:
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Luo Y, Xiao Q, Chao F, He Q, Lv F, Zhang L, Gao Y, Qiu X, Huang C, Li Y, Wang S, Jiang R, Gu H, Tang Y. 17β-estradiol replacement therapy protects myelin sheaths in the white matter of middle-aged female ovariectomized rats: a stereological study. Neurobiol Aging 2016; 47:139-148. [PMID: 27592282 DOI: 10.1016/j.neurobiolaging.2016.07.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 07/29/2016] [Accepted: 07/31/2016] [Indexed: 12/28/2022]
Abstract
Many studies have shown that estrogen replacement therapy (ERT) can improve cognitive function and affect the structure of the brain, including the white matter, in postmenopausal women. However, it is unclear whether ERT plays an important role in white matter remodeling in postmenopausal women. In the present study, middle-aged (9-12-month-old) female Sprague-Dawley rats were bilaterally ovariectomized (OVX) and randomly allocated to the vehicle treatment (OVX+Veh) group or the 17β-estradiol replacement (OVX+E) group. After 1 month of treatment, spatial learning and memory capacities were assessed using the Morris water maze task. Then, stereological methods were used to quantitatively evaluate white matter volume and myelinated fiber parameters of the white matter in the 2 groups of rats. The results revealed that the mean escape latency of the OVX+E rats in the Morris water maze task was significantly shorter than that of the OVX+Veh rats. The volume density of the myelinated fibers and the volume density and total volume of the myelin sheaths were significantly greater in the OVX+E rats than in the OVX+Veh rats. However, there were no significant differences in white matter volume or in the total length or volume of myelinated fibers in white matter between the 2 groups of rats. Our results showed that 1 month of ERT had significant beneficial effects on spatial learning capacity and on the myelin sheaths and myelinated fibers in the white matter of middle-aged OVX rats.
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Affiliation(s)
- Yanmin Luo
- Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing, PR China; Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Qian Xiao
- Department of Laboratory Medicine, Key Laboratory of Diagnostic Medicine, Ministry of Education, Chongqing Medical University, Chongqing, PR China; Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Fenglei Chao
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Qi He
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Fulin Lv
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Lei Zhang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Yuan Gao
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Xuan Qiu
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Chunxia Huang
- Department of Physiology, Chongqing Medical University, Chongqing, PR China
| | - Yongde Li
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Sanrong Wang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Rong Jiang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Hengwei Gu
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China
| | - Yong Tang
- Department of Histology and Embryology, Chongqing Medical University, Chongqing, PR China; Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, Chongqing, PR China.
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13
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Ovariectomy increases the age-induced hyperphosphorylation of Tau at hippocampal CA1. Cogn Process 2016; 17:443-449. [DOI: 10.1007/s10339-016-0768-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 05/30/2016] [Indexed: 12/11/2022]
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