DBA/2J mice are characterized by early onset hearing loss at about 3-4 weeks of age. Mutations in cadherin 23 (Cdh23) and fascin-2 (Fscn2) are responsible for the phenotypes, but the underlying mechanism is unknown. In the present study, DBA/2J mice displayed progressive hair cell loss and degeneration of spiral ganglion neurons (SGNs) after 2 weeks of age; however, the mRNA level of Caspase-3 in the inner ears was much higher at 2 weeks of age than that at 4 or 8 weeks of age. Moreover, transcriptional levels of Caspase-3 and Caspase-9 in the inner ears of DBA/2J mice were significantly higher than those of C57BL/6J mice at 2 or 8 weeks of age. Immunohistochemistry localized Caspase-3 and Caspase-9 mainly to the hair cells, SGNs and stria vascularis of the cochleae. To determine the significance of caspase-dependent apoptosis in the hearing loss, the pan-caspase inhibitor Z-VAD-FMK was given intraperitoneally to DBA/J2 mice over an 8-week period starting at one week of age. Blockage of caspases preserved hearing in the mice by more than 10 dB (dB) sound pressure level (SPL) of the ABR thresholds and significantly reduced outer hair cell loss at the basal turns of the cochleae. These results demonstrate that apoptosis in the cochleae of DBA/J2 mice contributes to the early onset of hearing loss, which can be attenuated by anti-apoptotic treatment.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.heares.2015.05.006 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Efficacy, durability and safety of faricimab for patients with neovascular age-related macular degeneration: 48-week results from the phase 3 LUCERNE China subpopulation.
Asia Pac J Ophthalmol (Phila)
January 2025
Peking Union Medical College Hospital, Beijing, China. Electronic address:
Purpose: To evaluate the efficacy, durability and safety of intravitreal faricimab versus aflibercept over 48 weeks in patients with neovascular age-related macular degeneration (nAMD) from the LUCERNE China subpopulation.
Design: LUCERNE (NCT03823300) was a phase 3 global, double-masked, active comparator-controlled trial. The China subpopulation comprised patients from mainland China, Taiwan and Hong Kong.
Factors affecting 1-year persistence with vedolizumab for ulcerative colitis: a multicenter, retrospective real-world study.
Intest Res
January 2025
Center for Advanced IBD Research and Treatment, Kitasato University Kitasato Institute Hospital, Tokyo, Japan.
Background/aims: The objectives of this real-world study were to determine 1-year persistence with vedolizumab in patients with ulcerative colitis and to evaluate factors contributing to loss of response.
Methods: In this multicenter, retrospective, observational chart review, patients with moderately to severely active ulcerative colitis who received ≥ 1 dose of vedolizumab in clinical practice at 16 tertiary hospitals in Japan (from December 2018 through February 2020) were enrolled.
Results: Persistence with vedolizumab was 64.
Motor imagery does not effectively improve walking-related performance in older adults: A randomised controlled trial.
Ann Phys Rehabil Med
January 2025
Healthy Brain & Mind Research Centre (HBM), School of Behavioural and Health Sciences, Australian Catholic University, 115 Victoria Parade, Fitzroy, VIC, 3065 Australia.
Background: Inaccurate perception of one's physical abilities is potentially related to age-related declines in motor planning and can lead to changes in walking. Motor imagery training is effective at improving balance and walking in older adults, but most research has been conducted on older adults following surgery or in those with a history of falls. Deficits in motor imagery ability are associated with reduced executive function in older adults with cognitive impairment.
View Article and Find Full Text PDFA simplified vaccination program elicits an immune response comparable to a complex standard vaccination program in commercial layers under field conditions.
Vet Immunol Immunopathol
January 2025
Department of Veterinary and Animal Sciences, University of Copenhagen, Dyrlægevej 88, Frederiksberg C 1870, Denmark.
Newcastle disease (ND) is a notifiable avian disease responsible for several panzootics, which has resulted in the establishment of mandatory vaccination programs against the virus in several countries including Denmark. This study compared the immune response elicited in layers by the standard vaccination program for ND of a Danish commercial egg production facility with a simplified version of the vaccination program. A commercial flock of layers was followed for 77 weeks from hatching to culling.
View Article and Find Full Text PDFDevelopmental changes of skin quality from breast, back, and thigh of Pekin ducks from 1 to 6 weeks of age.
Poult Sci
January 2025
State Key Laboratory of Livestock and Poultry Breeding, Guangdong Provincial Key Laboratory of Animal Nutrition and Regulation, College of Animal Science, South China Agricultural University, Guangzhou 510000, PR China. Electronic address:
Good skin quality not only improved carcass quality but also increased consumer demand for fresh poultry meat. This study aimed to investigate the developmental changes in skin growth and quality of Pekin ducks during 1-6 weeks of age. The skin samples were collected from the breast, back, and thigh tissues of six male ducks at the end of each week.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!