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Durán-Carabali LE, Da Silva JL, Colucci ACM, Netto CA, De Fraga LS. Protective effect of sex steroid hormones on morphological and cellular outcomes after neonatal hypoxia-ischemia: A meta-analysis of preclinical studies. Neurosci Biobehav Rev 2023; 145:105018. [PMID: 36572200 DOI: 10.1016/j.neubiorev.2022.105018] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 12/24/2022]
Abstract
Sex steroid hormones play an important role in fetal development, brain functioning and neuronal protection. Growing evidence highlights the positive effects of these hormones against brain damage induced by neonatal hypoxia-ischemia (HI). This systematic review with meta-analysis aims to verify the efficacy of sex steroid hormones in preventing HI-induced brain damage in rodent models. The protocol was registered at PROSPERO and a total of 22 articles were included. Moderate to large effects were observed in HI animals treated with sex steroid hormones in reducing cerebral infarction size and cell death, increasing neuronal survival, and mitigating neuroinflammatory responses and astrocyte reactivity. A small effect was evidenced for cognitive function, but no significant effect for motor function; moreover, a high degree of heterogeneity was observed. In summary, data suggest that sex steroid hormones, such as progesterone and 17β estradiol, improve morphological and cellular outcomes following neonatal HI. Further research is paramount to examine neurological function during HI recovery and standardization of methodological aspects is imperative to reduce the risk of spurious findings.
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Affiliation(s)
- L E Durán-Carabali
- Graduate Program in Biological Sciences: Physiology, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
| | - J L Da Silva
- Department of Physiology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - A C M Colucci
- Graduate Program in Biological Sciences: Physiology, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - C A Netto
- Graduate Program in Biological Sciences: Physiology, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Department of Biochemistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - L S De Fraga
- Graduate Program in Biological Sciences: Physiology, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Department of Physiology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
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2
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Wang L, Wang J, Shan Q, Shu H, Guo JM. Involvement of baroreflex deficiency in the age-related loss of estrogen efficacy against cerebral ischemia. Front Aging Neurosci 2023; 15:1167170. [PMID: 37205058 PMCID: PMC10186347 DOI: 10.3389/fnagi.2023.1167170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 04/03/2023] [Indexed: 05/21/2023] Open
Abstract
For post-menopausal women, stroke is complicated by the variable effects of estrogen therapy and the age-related therapeutic consequences involved. Estrogen therapy has been shown to have an age-dimorphic effect, which is neuroprotective in young females, but non-neuroprotective, even neurotoxic in acyclic females. We hypothesized that arterial baroreflex (ABR) and its downstream acetylcholine-α7 nicotinic acetylcholine receptor (α7nAChR) anti-inflammatory pathways are involved in estrogen efficacy toward cerebral ischemic damage. Our data showed that estrogen supplements contributed to ABR improvement and neuroprotection in adult, not aged, ovariectomized (OVX) rats. In adult rats, OVX-induced estrogen deficiency aggravated middle cerebral artery occlusion (MCAO), which induced brain infarction and reduced ABR function, with decreased α7nAChR expression of the brain and exaggerated inflammation following MCAO; these effects were significantly prevented by supplementation with estrogen. ABR impairment by sinoaortic denervation partly attenuated the estrogen effect on baroreflex sensitivity (BRS) and ischemic damage in adult rats, as well as α7nAChR expression and inflammatory response. These data suggested that ABR and acetylcholine-α7nAChR anti-inflammatory pathways are involved in the neuroprotection of estrogen in adult OVX rats. In contrast, aged rats exhibited more severe ischemic damage and inflammatory response than adult rats, as well as poorer baroreflex function and lower α7nAChR expression. Estrogen supplements did not improve BRS or confer neuroprotection in aged rats without affecting brain α7nAChR and post-ischemic inflammation. Most importantly, ketanserin restored ABR function and significantly postponed the onset of stroke in aged female strokeprone spontaneously hypertensive rats, whereas estrogen treatment failed to delay the development of stroke. Our findings reveal that estrogen is protective against ischemic stroke (IS) in adult female rats and that ABR played a role in this beneficial action. Dysfunction of ABR and unresponsiveness to estrogen in aged female rats may contribute to a reduced estrogen efficacy against cerebral ischemia.
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Affiliation(s)
- Lei Wang
- Department of Orthopedics, 960th Hospital of PLA, Jinan, Shandong, China
| | - Jia Wang
- Health Service Department, 960th Hospital of PLA, Jinan, Shandong, China
| | - Qing Shan
- Department of Clinical Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - He Shu
- Department of Clinical Pharmacy, 960th Hospital of PLA, Jinan, Shandong, China
| | - Jin-Min Guo
- Department of Clinical Pharmacy, 960th Hospital of PLA, Jinan, Shandong, China
- *Correspondence: Jin-Min Guo,
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3
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Clinical impact of estradiol/testosterone ratio in patients with acute ischemic stroke. BMC Neurol 2021; 21:91. [PMID: 33632142 PMCID: PMC7908649 DOI: 10.1186/s12883-021-02116-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 02/19/2021] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Sex hormones may be associated with a higher incidence of ischemic stroke or stroke-related events. In observational studies, lower testosterone concentrations are associated with infirmity, vascular disease, and adverse cardiovascular risk factors. Currently, female sexual hormones are considered neuroprotective agents. The purpose of this study was to assess the role of sex hormones and the ratio of estradiol/testosterone (E/T) in patients with acute ischemic stroke (AIS). METHODS Between January 2011 and December 2016, 146 male patients with AIS and 152 age- and sex-matched control subjects were included in this study. Sex hormones, including estradiol, progesterone, and testosterone, were evaluated in the AIS patient and control groups. We analyzed the clinical and physiological levels of sex hormones and hormone ratios in these patients. RESULTS The E/T ratio was significantly elevated among patients in the stroke group compared to those in the control group (P = 0.001). Categorization of data into tertiles revealed that patients with the highest E/T ratio were more likely to have AIS [odds ratio (OR) 3.084; 95% Confidence interval (CI): 1.616-5.886; P < 0.001) compared with those in the first tertile. The E/T ratio was also an independent unfavorable outcome predictor with an adjusted OR of 1.167 (95% CI: 1.053-1.294; P = 0.003). CONCLUSIONS These findings support the hypothesis that increased estradiol and reduced testosterone levels are associated with AIS in men.
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Kim T, Chelluboina B, Chokkalla AK, Vemuganti R. Age and sex differences in the pathophysiology of acute CNS injury. Neurochem Int 2019; 127:22-28. [PMID: 30654116 PMCID: PMC6579702 DOI: 10.1016/j.neuint.2019.01.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 01/11/2019] [Indexed: 12/21/2022]
Abstract
Despite the immeasurable burden on patients and families, no effective therapies to protect the CNS after an acute injury are available yet. Furthermore, the underlying mechanisms that promote neuronal death and functional deficits after injury remain to be poorly understood. The prevalence, age of onset, pathophysiology, and symptomatology of many CNS insults differ significantly between males and females. In the case of stroke, younger males tend to show a higher risk than younger females, while this trend reverses with age. Accumulating evidence from preclinical studies have shown that sex hormones play a crucial role in providing neuroprotection following ischemic stroke and other acute CNS injuries. Estrogen, in particular, exerts a neuroprotective effect by modulating the immune responses after injury. In addition, there exists a sexual dimorphism in cell death pathways between males and females that are independent of hormones. Meanwhile, recent studies suggest that microRNAs are critically involved in the sex-specific mechanisms of cell death. This review discusses the current knowledge on the contribution of sex and age to outcome after stroke. Implication of the interplay between these two factors on other CNS injuries (spinal cord injury and traumatic brain injury) from the experimental evidence were also discussed.
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Affiliation(s)
- TaeHee Kim
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
| | - Bharath Chelluboina
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA
| | - Anil K Chokkalla
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA; Cellular and Molecular Pathology Program, University of Wisconsin, Madison, WI, USA
| | - Raghu Vemuganti
- Department of Neurological Surgery, University of Wisconsin, Madison, WI, USA; Cellular and Molecular Pathology Program, University of Wisconsin, Madison, WI, USA; William S. Middleton Veterans Administration Hospital, Madison, WI, USA.
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Dominguez R, Zitting M, Liu Q, Patel A, Babadjouni R, Hodis DM, Chow RH, Mack WJ. Estradiol Protects White Matter of Male C57BL6J Mice against Experimental Chronic Cerebral Hypoperfusion. J Stroke Cerebrovasc Dis 2018; 27:1743-1751. [PMID: 29602614 PMCID: PMC5972054 DOI: 10.1016/j.jstrokecerebrovasdis.2018.01.030] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 01/03/2018] [Accepted: 01/25/2018] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND PURPOSE Estradiol is a sex steroid hormone known to protect the brain against damage related to transient and global cerebral ischemia. In the present study, we leverage an experimental murine model of bilateral carotid artery stenosis (BCAS) to examine the putative effects of estradiol therapy on chronic cerebral hypoperfusion. We hypothesize that long-term estradiol therapy protects against white matter injury and declarative memory deficits associated with chronic cerebral hypoperfusion. METHODS Adult male C57BL/6J mice underwent either surgical BCAS or sham procedures. Two days after surgery, the mice were given oral estradiol (Sham+E, BCAS+E) or placebo (Sham+P, BCAS+P) treatments daily for 31-34 days. All mice underwent Novel Object Recognition (NOR) testing 31-34 days after the start of oral treatments. Following sacrifice, blood was collected and brains fixed, sliced, and prepared for histological examination of white matter injury and extracellular signal-regulated kinase (ERK) expression. RESULTS Animals receiving long-term oral estradiol therapy (BCAS-E2 and Sham-E2) had higher plasma estradiol levels than those receiving placebo treatment (BCAS-P and Sham-P). BCAS-E2 mice demonstrated less white matter injury (Klüver-Barrera staining) and performed better on the NOR task compared to BCAS-P mice. ERK expression in the brain was increased in the BCAS compared to sham cohorts. Among the BCAS mice, the BCAS-E2 cohort had a greater number of ERK + cells. CONCLUSION This study demonstrates a potentially protective role for oral estradiol therapy in the setting of white matter injury and declarative memory deficits secondary to murine chronic cerebral hypoperfusion.
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Affiliation(s)
- Reymundo Dominguez
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Madison Zitting
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Qinghai Liu
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Arati Patel
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Robin Babadjouni
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Drew M Hodis
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Robert H Chow
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - William J Mack
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, California.
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Meadows KL. Ischemic stroke and select adipose-derived and sex hormones: a review. Hormones (Athens) 2018; 17:167-182. [PMID: 29876798 DOI: 10.1007/s42000-018-0034-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 04/27/2018] [Indexed: 02/03/2023]
Abstract
Ischemic stroke is the fifth leading cause of death in the USA and is the leading cause of serious, long-term disability worldwide. The principle sex hormones (estrogen, progesterone, and testosterone), both endogenous and exogenous, have profound effects on various stroke outcomes and have become the focus of a number of studies evaluating risk factors and treatment options for ischemic stroke. In addition, the expression of other hormones that may influence stroke outcome, including select adipose-derived hormones (adiponectin, leptin, and ghrelin), can be regulated by sex hormones and are also the focus of several ischemic stroke studies. This review aims to summarize some of the preclinical and clinical studies investigating the principle sex hormones, as well as select adipose-derived hormones, as risk factors or potential treatments for ischemic stroke. In addition, the potential for relaxin, a lesser studied sex hormone, as a novel treatment option for ischemic stroke is explored.
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Affiliation(s)
- Kristy L Meadows
- Cummings School of Veterinary Medicine, Tufts University, 200 Westboro Rd., North Grafton, MA, 01536, USA.
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Guo JM, Shu H, Wang L, Xu JJ, Niu XC, Zhang L. SIRT1-dependent AMPK pathway in the protection of estrogen against ischemic brain injury. CNS Neurosci Ther 2017; 23:360-369. [PMID: 28256111 DOI: 10.1111/cns.12686] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 01/22/2017] [Accepted: 02/07/2017] [Indexed: 01/06/2023] Open
Abstract
AIMS Stroke is a major cause of mortality and disability, especially for postmenopausal women. In view of the protective action of estrogen, hormone therapy remains the only effective way to limit this risk. The objective of this study was to investigate the efficiency and underlying mechanisms of estrogen neuroprotection. METHODS Subcutaneous injection of 17β-estradiol in rats after ovariectomy (OVX) was used to manipulate estrogen level and explore the effects of estrogen in cerebral ischemic damage both in vivo and in vitro. Silent mating type information regulation 2 homolog 1 (SIRT1) knockout mice and adenosine monophosphate (AMP)-activated kinase (AMPK) inhibitor Compound C were also used to investigate the underlying pathway of estrogen. RESULTS Estrogen deficiency induced by OVX aggravated brain infarction in experimentally induced cerebral ischemia rats, whereas estrogen pretreatment reduced ischemia-induced cerebral injuries. Neurons of estrogen deficiency models were susceptible to apoptosis under oxygen-glucose deprivation (OGD). In contrast, neurons with estrogen-supplemented serum exhibited restored resistance to cell apoptosis. In OGD neurons, estrogen promoted AMPK activation through estrogen receptor α, and neuroprotection of estrogen was prevented by AMPK inhibition. Estrogen increased SIRT1 expression and activation, and estrogen-induced AMPK activation disappeared in SIRT1 knockout neurons. Moreover, estrogen-induced neuroprotection was abolished in SIRT1 knockout mice and AMPK-inhibited rats. CONCLUSION Our data support that estrogen protects against ischemic stroke through preventing neuron death via the SIRT1-dependent AMPK pathway.
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Affiliation(s)
- Jin-Min Guo
- Department of Pharmacology, Jinan Military General Hospital, Jinan, Shandong, China
| | - He Shu
- Department of Pharmacology, Jinan Military General Hospital, Jinan, Shandong, China
| | - Lei Wang
- Department of Orthopaedics, Jinan Military General Hospital, Jinan, Shandong, China
| | - Jian-Jiang Xu
- Department of Pharmacology, Jinan Military General Hospital, Jinan, Shandong, China
| | - Xue-Cai Niu
- Department of Radiotheropy, The Forth Hospital of Jinan City, Jinan, Shandong, China
| | - Li Zhang
- Department of Pharmacology, Jinan Military General Hospital, Jinan, Shandong, China
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8
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Ingberg E, Theodorsson E, Theodorsson A, Ström JO. Effects of high and low 17β-estradiol doses on focal cerebral ischemia in rats. Sci Rep 2016; 6:20228. [PMID: 26839007 PMCID: PMC4738304 DOI: 10.1038/srep20228] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 12/23/2015] [Indexed: 12/19/2022] Open
Abstract
The majority of the numerous animal studies of the effects of estrogens on cerebral ischemia have reported neuroprotective results, but a few have shown increased damage. Differences in hormone administration methods, resulting in highly different 17β-estradiol levels, may explain the discrepancies in previously reported effects. The objective of the present study was to test the hypothesis that it is the delivered dose per se, and not the route and method of administration, that determines the effect, and that high doses are damaging while lower doses are protective. One hundred and twenty ovariectomized female Wistar rats (n = 40 per group) were randomized into three groups, subcutaneously administered different doses of 17β-estradiol and subjected to transient middle cerebral artery occlusion. The modified sticky tape test was performed after 24 h and the rats were subsequently sacrificed for infarct size measurements. In contrast to our hypothesis, a significant negative correlation between 17β-estradiol dose and infarct size was found (p = 0.018). Thus, no support was found for the hypothesis that 17β-estradiol can be both neuroprotective and neurotoxic merely depending on dose. In fact, on the contrary, the findings indicate that the higher the dose of 17β-estradiol, the smaller the infarct.
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Affiliation(s)
- Edvin Ingberg
- Department of Clinical Chemistry and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Elvar Theodorsson
- Department of Clinical Chemistry and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Annette Theodorsson
- Department of Clinical Chemistry and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.,Division of Neuroscience, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Department of Neurosurgery, Anaesthetics, Operations and Specialty Surgery Center, Region Östergötland
| | - Jakob O Ström
- Department of Clinical Chemistry and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.,Vårdvetenskapligt Forskningscentrum/Centre for Health Sciences, Örebro University Hospital, Region Örebro Län, Örebro, Sweden.,School of Health and Medical Sciences, Örebro University, Örebro, Sweden
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Duarte-Guterman P, Yagi S, Chow C, Galea LAM. Hippocampal learning, memory, and neurogenesis: Effects of sex and estrogens across the lifespan in adults. Horm Behav 2015; 74:37-52. [PMID: 26122299 DOI: 10.1016/j.yhbeh.2015.05.024] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 04/29/2015] [Accepted: 05/26/2015] [Indexed: 01/12/2023]
Abstract
This article is part of a Special Issue "Estradiol and Cognition". There are sex differences in hippocampus-dependent cognition and neurogenesis suggesting that sex hormones are involved. Estrogens modulate certain forms of spatial and contextual memory and neurogenesis in the adult female rodent, and to a lesser extent male, hippocampus. This review focuses on the effects of sex and estrogens on hippocampal learning, memory, and neurogenesis in the young and aged adult rodent. We discuss how factors such as the type of estrogen, duration and dose of treatment, timing of treatment, and type of memory influence the effects of estrogens on cognition and neurogenesis. We also address how reproductive experience (pregnancy and mothering) and aging interact with estrogens to modulate hippocampal cognition and neurogenesis in females. Given the evidence that adult hippocampal neurogenesis plays a role in long-term spatial memory and pattern separation, we also discuss the functional implications of regulating neurogenesis in the hippocampus.
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Affiliation(s)
- Paula Duarte-Guterman
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada
| | - Shunya Yagi
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada
| | - Carmen Chow
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada
| | - Liisa A M Galea
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada.
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Kim TH, Vemuganti R. Effect of sex and age interactions on functional outcome after stroke. CNS Neurosci Ther 2015; 21:327-36. [PMID: 25404174 PMCID: PMC6495347 DOI: 10.1111/cns.12346] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 10/01/2014] [Accepted: 10/03/2014] [Indexed: 01/18/2023] Open
Abstract
Stroke is one of the leading causes of death and disability worldwide. Experimental and clinical studies showed that sex and age play an important role in deciding the outcome after stroke. At younger ages, males were shown to have a higher risk for stroke than females. However, this trend reverses in older ages particularly when females reach menopause. Many preclinical studies indicate that steroid hormones modulate the age-dependent differential stroke outcome. In addition, patterns of cell death pathways activated following cerebral ischemia are distinct between males and females, but independent of steroid hormones. Recent studies also indicate that microRNAs play important roles in mediating sex-specific stroke outcome by regulating stroke-related genes. This review discusses the contribution of sex and age to outcome after stroke with particular emphasis on the experimental studies that examined the effects of steroid hormones, differential cell death pathways, and involvement of sex-specific microRNAs following cerebral ischemia. Current understanding of the role of thrombolytic agents in stroke therapy is also discussed.
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Affiliation(s)
- Tae-Hee Kim
- Department of Neurological Surgery, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA; Neuroscience Training Program, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
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