RESUMEN
INTRODUCTION: The androgen receptor (AR) is a critical driver of prostate cancer progression, and the advent of androgen receptor pathway inhibitors (ARPIs) has transformed the treatment landscape of metastatic prostate cancer. However, resistance to ARPIs eventually develops via mutations in AR, AR overexpression, and alternative AR signaling which have required novel approaches to target effectively. AREAS COVERED: The mechanism of action and early clinical results of proteolysis targeting chimera (PROTAC) agents targeting AR are reviewed. Preclinical and early clinical data for other emerging AR-targeting therapeutics, including dual-action androgen receptor inhibitors (DAARIs) and anitens that target the N-terminal domain of AR, were also identified through literature search for agents which may circumvent resistance through AR splice variants and AR ligand-binding domain mutations. The literature search utilized PubMed to identify articles that were relevant to this review from 2000 to 2024. EXPERT OPINION: PROTACs, DAARIs, and anitens represent novel and promising AR-targeting therapeutics that may become an important part of prostate cancer treatment in the future. Elucidating mechanisms of resistance, including ability of these agents to target full length AR, may yield further insights into maximal therapeutic efficacy aimed at silencing AR signaling.
Asunto(s)
Antagonistas de Receptores Androgénicos , Resistencia a Antineoplásicos , Terapia Molecular Dirigida , Neoplasias de la Próstata , Receptores Androgénicos , Humanos , Masculino , Receptores Androgénicos/metabolismo , Receptores Androgénicos/genética , Neoplasias de la Próstata/tratamiento farmacológico , Neoplasias de la Próstata/patología , Neoplasias de la Próstata/genética , Antagonistas de Receptores Androgénicos/farmacología , Animales , Transducción de Señal/efectos de los fármacos , Mutación , Proteolisis , Progresión de la EnfermedadRESUMEN
Mounting ambitions and capabilities for public and private, non-government sector crewed space exploration bring with them an increasingly diverse set of space travelers, raising new and nontrivial ethical, legal, and medical policy and practice concerns which are still relatively underexplored. In this piece, we lay out several pressing issues related to ethical considerations for selecting space travelers and conducting human subject research on them, especially in the context of non-governmental and commercial/private space operations.
Asunto(s)
Vuelo Espacial , Humanos , Vuelo Espacial/ética , AstronautasRESUMEN
Human space exploration poses inherent risks to astronauts' health, leading to molecular changes that can significantly impact their well-being. These alterations encompass genomic instability, mitochondrial dysfunction, increased inflammation, homeostatic dysregulation, and various epigenomic changes. Remarkably, these changes bear similarities to those observed during the aging process on Earth. However, our understanding of the connection between these molecular shifts and disease development in space remains limited. Frailty syndrome, a clinical syndrome associated with biological aging, has not been comprehensively investigated during spaceflight. To bridge this knowledge gap, we leveraged murine data obtained from NASA's GeneLab, along with astronaut data gathered from the JAXA and Inspiration4 missions. Our objective was to assess the presence of biological markers and pathways related to frailty, aging, and sarcopenia within the spaceflight context. Through our analysis, we identified notable changes in gene expression patterns that may be indicative of the development of a frailty-like condition during space missions. These findings suggest that the parallels between spaceflight and the aging process may extend to encompass frailty as well. Consequently, further investigations exploring the utility of a frailty index in monitoring astronaut health appear to be warranted.
Asunto(s)
Envejecimiento , Biomarcadores , Fragilidad , Vuelo Espacial , Envejecimiento/genética , Animales , Ratones , Humanos , Astronautas , Masculino , Ingravidez/efectos adversos , Sarcopenia/metabolismoRESUMEN
Importance: Stroke is a leading cause of death and disability in the US. Accurate and updated measures of stroke burden are needed to guide public health policies. Objective: To present burden estimates of ischemic and hemorrhagic stroke in the US in 2019 and describe trends from 1990 to 2019 by age, sex, and geographic location. Design, Setting, and Participants: An in-depth cross-sectional analysis of the 2019 Global Burden of Disease study was conducted. The setting included the time period of 1990 to 2019 in the US. The study encompassed estimates for various types of strokes, including all strokes, ischemic strokes, intracerebral hemorrhages (ICHs), and subarachnoid hemorrhages (SAHs). The 2019 Global Burden of Disease results were released on October 20, 2020. Exposures: In this study, no particular exposure was specifically targeted. Main Outcomes and Measures: The primary focus of this analysis centered on both overall and age-standardized estimates, stroke incidence, prevalence, mortality, and DALYs per 100â¯000 individuals. Results: In 2019, the US recorded 7.09 million prevalent strokes (4.07 million women [57.4%]; 3.02 million men [42.6%]), with 5.87 million being ischemic strokes (82.7%). Prevalence also included 0.66 million ICHs and 0.85 million SAHs. Although the absolute numbers of stroke cases, mortality, and DALYs surged from 1990 to 2019, the age-standardized rates either declined or remained steady. Notably, hemorrhagic strokes manifested a substantial increase, especially in mortality, compared with ischemic strokes (incidence of ischemic stroke increased by 13% [95% uncertainty interval (UI), 14.2%-11.9%]; incidence of ICH increased by 39.8% [95% UI, 38.9%-39.7%]; incidence of SAH increased by 50.9% [95% UI, 49.2%-52.6%]). The downturn in stroke mortality plateaued in the recent decade. There was a discernible heterogeneity in stroke burden trends, with older adults (50-74 years) experiencing a decrease in incidence in coastal areas (decreases up to 3.9% in Vermont), in contrast to an uptick observed in younger demographics (15-49 years) in the South and Midwest US (with increases up to 8.4% in Minnesota). Conclusions and Relevance: In this cross-sectional study, the declining age-standardized stroke rates over the past 3 decades suggest progress in managing stroke-related outcomes. However, the increasing absolute burden of stroke, coupled with a notable rise in hemorrhagic stroke, suggests an evolving and substantial public health challenge in the US. Moreover, the significant disparities in stroke burden trends across different age groups and geographic locations underscore the necessity for region- and demography-specific interventions and policies to effectively mitigate the multifaceted and escalating burden of stroke in the country.
RESUMEN
OBJECTIVES: This article describes key data sources and methods used to estimate hearing loss in the United States, in the Global Burden of Disease study. Then, trends in hearing loss are described for 2019, including temporal trends from 1990 to 2019, changing prevalence over age, severity patterns, and utilization of hearing aids. DESIGN: We utilized population-representative surveys from the United States to estimate hearing loss prevalence for the Global Burden of Disease study. A key input data source in modeled estimates are the National Health and Nutrition Examination Surveys (NHANES), years 1988 to 2010. We ran hierarchical severity-specific models to estimate hearing loss prevalence. We then scaled severity-specific models to sum to total hearing impairment prevalence, adjusted estimates for hearing aid coverage, and split estimates by etiology and tinnitus status. We computed years lived with disability (YLDs), which quantifies the amount of health loss associated with a condition depending on severity and creates a common metric to compare the burden of disparate diseases. This was done by multiplying the prevalence of severity-specific hearing loss by corresponding disability weights, with additional weighting for tinnitus comorbidity. RESULTS: An estimated 72.88 million (95% uncertainty interval (UI) 68.53 to 77.30) people in the United States had hearing loss in 2019, accounting for 22.2% (20.9 to 23.6) of the total population. Hearing loss was responsible for 2.24 million (1.56 to 3.11) YLDs (3.6% (2.8 to 4.7) of total US YLDs). Age-standardized prevalence was higher in males (17.7% [16.7 to 18.8]) compared with females (11.9%, [11.2 to 12.5]). While most cases of hearing loss were mild (64.3%, 95% UI 61.0 to 67.6), disability was concentrated in cases that were moderate or more severe. The all-age prevalence of hearing loss in the United States was 28.1% (25.7 to 30.8) higher in 2019 than in 1990, despite stable age-standardized prevalence. An estimated 9.7% (8.6 to 11.0) of individuals with mild to profound hearing loss utilized a hearing aid, while 32.5% (31.9 to 33.2) of individuals with hearing loss experienced tinnitus. Occupational noise exposure was responsible for 11.2% (10.2 to 12.4) of hearing loss YLDs. CONCLUSIONS: Results indicate large burden of hearing loss in the United States, with an estimated 1 in 5 people experiencing this condition. While many cases of hearing loss in the United States were mild, growing prevalence, low usage of hearing aids, and aging populations indicate the rising impact of this condition in future years and the increasing importance of domestic access to hearing healthcare services. Large-scale audiometric surveys such as NHANES are needed to regularly assess hearing loss burden and access to healthcare, improving our understanding of who is impacted by hearing loss and what groups are most amenable to intervention.
Asunto(s)
Audífonos , Pérdida Auditiva , Acúfeno , Masculino , Femenino , Humanos , Estados Unidos/epidemiología , Prevalencia , Carga Global de Enfermedades , Acúfeno/epidemiología , Años de Vida Ajustados por Discapacidad , Encuestas Nutricionales , Salud Global , Pérdida Auditiva/epidemiología , Años de Vida Ajustados por Calidad de VidaRESUMEN
Ranaviruses are large, dsDNA viruses that have significant ecological and economic impact on cold-blooded vertebrates. However, our understanding of the viral proteins and subsequent host immune response(s) that impact susceptibility to infection and disease is not clear. The ranavirus Ambystoma tigrinum virus (ATV), originally isolated from the Sonoran tiger salamander (Ambystoma mavortium stebbinsi), is highly pathogenic at low doses of ATV at all tiger salamander life stages and this model has been used to explore the host-pathogen interactions of ATV infection. However, inconsistencies in the availability of laboratory reared larval tiger salamanders required us to look at the well characterized axolotl (A. mexicanum) as a model for ATV infection. Data obtained from five infection experiments over different developmental timepoints suggest that axolotls are susceptible to ATV in an age- and dose-dependent manner. These data support the use of the ATV-axolotl model to further explore the host-pathogen interactions of ranavirus infections.
Asunto(s)
Ambystoma mexicanum , Ranavirus , Animales , Ranavirus/genética , Ambystoma , Interacciones Huésped-Patógeno , LarvaRESUMEN
Genetic studies show that BLOC1S1 modulates mitochondrial and endosome-lysosome function (Wu et al., 2021a). Furthermore, Bloc1s1 mutations are linked to leukodystrophy (Bertoli-Avella et al., 2021). The Vanderver laboratory identified additional individuals with leukodystrophy that harbored either complex heterozygous (Bloc1s1 c.206A > C and c.359G > A), or homozygous (Bloc1s1 c.185 T > C) point mutations. We generated induced pluripotential stem cell (iPSC) lines from these subjects, from parents of the complex heterozygous mutations patient, and from CRISPR isogenic (c.206A > C and c.359G > A) corrected iPSC-line. These complex heterozygous, homozygous, and isogenic-corrected Bloc1s1 lines were phenotypically normal and were capable of differentiation towards the three germ layers.
Asunto(s)
Células Madre Pluripotentes Inducidas , Humanos , Homocigoto , Células Madre Pluripotentes Inducidas/metabolismo , Heterocigoto , Mutación/genética , Repeticiones Palindrómicas Cortas Agrupadas y Regularmente Espaciadas , Proteínas del Tejido Nervioso/metabolismoRESUMEN
Outer space is an extremely hostile environment for human life, with ionizing radiation from galactic cosmic rays and microgravity posing the most significant hazards to the health of astronauts. Spaceflight has also been shown to have an impact on established cancer hallmarks, possibly increasing carcinogenic risk. Terrestrially, women have a higher incidence of radiation-induced cancers, largely driven by lung, thyroid, breast, and ovarian cancers, and therefore, historically, they have been permitted to spend significantly less time in space than men. In the present review, we focus on the effects of microgravity and radiation on the female reproductive system, particularly gynecological cancer. The aim is to provide a summary of the research that has been carried out related to the risk of gynecological cancer, highlighting what further studies are needed to pave the way for safer exploration class missions, as well as postflight screening and management of women astronauts following long-duration spaceflight.
Asunto(s)
Ginecología , Neoplasias Inducidas por Radiación , Vuelo Espacial , Ingravidez , Astronautas , Femenino , Humanos , Masculino , Ingravidez/efectos adversosRESUMEN
The mechanisms orchestrating recycling of lysosomes through autophagic lysosome reformation (ALR) is incompletely understood. Previous data show that genetic depletion of BLOC1S1/GCN5L1/BORCS1 increases autolysosome (AL) accumulation. We postulated that this phenotype may manifest due to perturbed ALR. We explored this in control and bloc1s1 liver-specific knockout (LKO) mouse hepatocytes, showing that in response to nutrient-deprivation LKO's fail to initiate ALR due to blunted lysosomal tubulation. As kinesin motor proteins and the intracellular cytoskeleton are requirements for tubular formation from ALs, we explored the interaction of BLOC1S1 with motor proteins and cytoskeletal factors. BLOC1S1 interacts with the ARL8B-KIF5B (GTPase and kinesin motor protein) complex to recruit KIF5B to ALs. Furthermore, BLOC1S1 interacts with the actin nucleation promoting factor WHAMM, which is an essential structural protein in the initiation of lysosomal tubulation (LT). Interestingly, the genetic reintroduction of BLOC1S1 rescues LT in LKO hepatocytes, but not when KIF5B is concurrently depleted. Finally, given the central role of MTORC1 signaling in ALR initiation, it was interesting that MTORC1 activity was increased despite the absence of LT in LKO hepatocytes. Concurrently, inhibition of MTORC1 abolished BLOC1S1 reconstitution-mediated rescue of LT in LKO hepatocytes. Taken together these data demonstrate that the functional interaction of BLOC1S1 with the kinesin binding complex and the actin cytoskeleton are a requirement for LT which, in parallel with MTORC1 signaling, initiate lysosome recycling via ALR.Abbreviations: 3-MA: 3-methyladenine; AL: autolysosome; ALR: autophagic lysosome reformation; ARL8B: ADP-ribosylation factor-like protein 8B; ARPC2: actin related protein 2/3 complex, subunit 2; ATAT1/αTAT1: alpha tubulin acetyltransferase 1; AVd: autophagic vacuoles, degradative; BLOC1S1/GCN5L1: biogenesis of lysosomal organelles complex-1, subunit 1; CQ: chloroquine; KIF5B: kinesin family member 5B; KLC1: kinesin light chain 1; LAMP1: lysosomal-associated membrane protein 1; LAMP2: lysosomal-associated membrane protein 2; LC3B-I: cytosolic form of LC3B; LC3B-II: lipidated form of LC3B; MAP1LC3B/LC3B: microtubule-associated protein 1 light chain 3 beta; LKO: liver-specific knockout; LIs: lysosome inhibitors; LT: lysosomal tubulation; Ly: lysosome; MTORC1: mechanistic target of rapamycin kinase complex 1; PLEKHM2/SKIP: pleckstrin homology domain containing, family M (with RUN domain) member 2; Snapin: SNAP-associated protein; SQSTM1/p62: sequestosome 1; SVPs: synaptic vesicle precursors; TFEB: transcription Factor EB; TFE3: transcription factor E3; WHAMM: WAS protein homolog associated with actin, golgi membranes and microtubules.