Publications by authors named "Spencer Kim"

Amyotrophic lateral sclerosis (ALS) is an orphan neurodegenerative disease. Immune system dysregulation plays an essential role in ALS onset and progression. Our preclinical studies have shown that the administration of exogenous allogeneic B cells improves outcomes in murine models of skin and brain injury through a process termed pligodraxis, in which B cells adopt an immunoregulatory and neuroprotective phenotype in an injured environment.

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Introduction/aims: Genetics is an important risk factor for amyotrophic lateral sclerosis (ALS), a neurodegenerative disease affecting motor neurons. Recent findings demonstrate that in addition to specific genetic mutations, structural variants caused by genetic instability can also play a causative role in ALS. Genomic instability can lead to deletions, duplications, insertions, inversions, and translocations in the genome, and these changes can sometimes lead to fusion of distinct genes into a single transcript.

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Orthogonal recreation of the signaling profile of a chemical synapse is a current challenge in neuroscience. This is due in part to the kinetics of synaptic signaling, where neurotransmitters are rapidly released and quickly cleared by active reuptake machinery. One strategy to produce a rapid rise in an orthogonally controlled signal is via photocaged compounds.

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Background: To date, it is still controversial whether tau phosphorylation plays a role in Huntington's disease (HD), as previous studies demonstrated either no alterations or increases in phosphorylated tau (pTau) in HD postmortem brain and mouse models.

Objective: The goal of this study was to determine whether total tau and pTau levels are altered in HD.

Methods: Immunohistochemistry, cellular fractionations, and western blots were used to measure total tau and pTau levels in a large cohort of HD and control postmortem prefrontal cortex (PFC).

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Background: To date, it is still controversial whether tau phosphorylation plays a role in Huntington's disease (HD), as previous studies demonstrated either no alterations or increases in phosphorylated tau (pTau) in HD post-mortem brain and mouse models.

Objectives: The goal of this study was to determine whether total tau and pTau levels are altered in HD.

Methods: Immunohistochemistry, cellular fractionations, and western blots were used to measure tau and pTau levels in a large cohort of HD and control post-mortem prefrontal cortex (PFC).

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The authors examined perspectives of health care providers (HCPs) who serve Native Hawaiian and Pacific Islander (NH/PI) adolescents to inform the adaption of an existing American Indian and Alaska Native-specific gestational diabetes mellitus (GDM) risk reduction and preconception counseling program entitled Stopping GDM, for NH/PI adolescents. Hawai'i-based HCPs (n=14) who care for NH/PI adolescent females volunteered for this expert panel focus group study. These HCP participants served as an expert panel specific to their experiences in providing primary care and reproductive health care/family planning, and their perspectives regarding GDM risk reduction for NH adolescents.

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Dopaminergic pathways control highly consequential aspects of physiology and behavior. One of the most therapeutically important and best-studied receptors in these pathways is dopamine receptor D (DRD2). Unfortunately, DRD2 is challenging to study with traditional molecular biological techniques, and most drugs designed to target DRD2 are ligands for many other receptors.

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Positive and negative associations acquired through olfactory experience are thought to be especially strong and long-lasting. The conserved direct olfactory sensory input to the ventral striatal olfactory tubercle (OT) and its convergence with dense dopaminergic input to the OT could underlie this privileged form of associative memory, but how this process occurs is not well understood. We imaged the activity of the two canonical types of striatal neurons, expressing D1- or D2-type dopamine receptors, in the OT at cellular resolution while mice learned odor-outcome associations ranging from aversive to rewarding.

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Article Synopsis
  • Researchers found that phosphorylated tau protein (pTau) is mislocalized in the motor cortex of ALS patients, indicating a link to mitochondrial dysfunction.
  • While overall tau levels were unchanged, mutant C9ORF72-ALS showed increased total tau and pTau-S396, with a notable decrease in pTau-T181 levels compared to healthy controls.
  • Analysis of cerebrospinal fluid revealed that total tau levels were elevated in bulbar-onset ALS and the pTau-T181:tau ratio was lower across all ALS samples, suggesting these could be potential biomarkers for disease progression.
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Article Synopsis
  • - Understanding ALS mechanisms, particularly mitochondrial dysfunction, is key for developing new treatments, as prior studies indicate a critical link between mitochondrial issues and disease progression.
  • - Hyperphosphorylated tau (pTau-S396) was found to mis-localize in ALS patients, leading to increased oxidative stress and mitochondrial fragmentation, which could impair cell function.
  • - Reducing tau levels using a selective tau degrader showed potential in preventing mitochondrial dysfunction and oxidative stress in ALS models, suggesting a novel therapeutic pathway.
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In seasonally breeding vertebrates, hormones coordinate changes in nervous system structure and function to facilitate reproductive readiness and success. Steroid hormones often exert their effects indirectly via regulation of neuromodulators, which in turn can coordinate the modulation of sensory input with appropriate motor output. Female plainfin midshipman fish (Porichthys notatus) undergo increased peripheral auditory sensitivity in time for the summer breeding season, improving their ability to detect mates, which is regulated by steroid hormones.

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Background And Purpose: Effective mentorship is critical to the success of early stage investigators, and has been linked to enhanced mentee productivity, self-efficacy, and career satisfaction. The mission of the National Research Mentoring Network (NRMN) is to provide all trainees across the biomedical, behavioral, clinical, and social sciences with evidence-based mentorship and professional development programming that emphasizes the benefits and challenges of diversity, inclusivity, and culture within mentoring relationships, and more broadly the research workforce. The purpose of this paper is to describe the structure and activities of NRMN.

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Although the neuroanatomical distribution of catecholaminergic (CA) neurons has been well documented across all vertebrate classes, few studies have examined CA connectivity to physiologically and anatomically identified neural circuitry that controls behavior. The goal of this study was to characterize CA distribution in the brain and inner ear of the plainfin midshipman fish (Porichthys notatus) with particular emphasis on their relationship with anatomically labeled circuitry that both produces and encodes social acoustic signals in this species. Neurobiotin labeling of the main auditory end organ, the saccule, combined with tyrosine hydroxylase immunofluorescence (TH-ir) revealed a strong CA innervation of both the peripheral and central auditory system.

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While the neural circuitry and physiology of the auditory system is well studied among vertebrates, far less is known about how the auditory system interacts with other neural substrates to mediate behavioral responses to social acoustic signals. One species that has been the subject of intensive neuroethological investigation with regard to the production and perception of social acoustic signals is the plainfin midshipman fish, Porichthys notatus, in part because acoustic communication is essential to their reproductive behavior. Nesting male midshipman vocally court females by producing a long duration advertisement call.

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Objective: The purpose of this literature review is to critically review the evidence for chiropractic as a treatment of primary insomnia.

Methods: A search of the following databases up to October 2006 was conducted: PubMed, PEDro, MANTIS, CINAHL, and the specialized register of the Cochrane review group. We also performed hand searching of relevant journals.

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This study aims to synthesize lead-free ferroelectric material, (Bi(1/2)Na(1/2))TiO3 using the Liquid Sprayed Mist Chemical Vapor Deposition (LSMCVD) technique. The mist of precursor solution was vaporized and deposited on two different substrates of Si(100) and (111)Pt/TiO2/SiO2/Si(100) in an oxygen atmosphere. The deposition temperature and time were varied in the range of 400-600 degrees C and 30-90 min.

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