El Diario De Greg 3 Epub
El Diario De Greg 3 Epub === https://urllio.com/2t7XLe
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Multiple neurological disorders are characterized by the abnormal accumulation of protein aggregates and the progressive impairment of complex behaviors. Our Drosophila studies demonstrate that middle-aged wild-type flies (WT, ~4-weeks) exhibit a marked accumulation of neural aggregates that is commensurate with the decline of the autophagy pathway. However, enhancing autophagy via neuronal over-expression of Atg8a (Atg8a-OE) reduces the age-dependent accumulation of aggregates. Here we assess basal locomotor activity profiles for single- and group-housed male and female WT flies and observed that only modest behavioral changes occurred by 4-weeks of age, with the noted exception of group-housed male flies. Male flies in same-sex social groups exhibit a progressive increase in nighttime activity. Infrared videos show aged group-housed males (4-weeks) are engaged in extensive bouts of courtship during periods of darkness, which is partly repressed during lighted conditions. Together, these nighttime courtship behaviors were nearly absent in young WT flies and aged Atg8a-OE flies. Previous studies have indicated a regulatory role for olfaction in male courtship partner choice. Coincidently, the mRNA expression profiles of several olfactory genes decline with age in WT flies; however, they are maintained in age-matched Atg8a-OE flies. Together, these results suggest that middle-aged male flies develop impairments in olfaction, which could contribute to the dysregulation of courtship behaviors during dark time periods. Combined, our results demonstrate that as Drosophila age, they develop early behavior defects that are coordinate with protein aggregate accumulation in the nervous system. In addition, the nighttime activity behavior is preserved when neuronal autophagy is maintained (Atg8a-OE flies). Thus, environmental or genetic factors that modify autophagic capacity could have a positive impact on neuronal aging and complex behaviors.
For protein aggregate analysis, w1118/+ male flies at different ages were collected, flash frozen, and stored at -80°C. Heads were separated from bodies and homogenized using a Bead Ruptor-24 System (Omni International, Kennesaw, GA, USA) before sequential extraction in standard Triton X-100 (1.0%) and sodium dodecyl sulfate (SDS) (2.0%) buffers [12, 13]. Protein concentrations for each sample were determined using the DC Protein assay (Bio-Rad). For Western analysis, 20μg of total protein was loaded per sample and resolved on a 10% Bis-Tris gel (Bio-Rad), followed by electro-blotting onto Immobilon-P membranes (Millipore Corp., Billerica, MA, USA) using the Trans Blot Turbo system (Bio-Rad) [12, 13]. Blots were sequentially probed using anti-Ref(2)P, anti-Ubiquitin (P4D1, Cell Signaling Technology, Danvers, MA, USA) and anti-Actin (13E5, Cell Signaling) antibodies at a 1:1,000 dilution [9, 12, 13]. Blots were developed using Thermo Scientific West Dura Substrate (Thermo Scientific/Pierce, Rockford, IL, USA) and the ChemiDoc digital Imaging System and Quantity One software (Bio-Rad).
We have previously shown that by using a sequential protein extraction method (1% Triton X-100 and 2% SDS buffers), we can reproducibly detect the buildup of insoluble aggregate-like proteins in neural tissues from adult Drosophila [9, 12, 13]. In the SDS-soluble fraction (Triton X-100 insoluble fraction), this includes an age-related increase in insoluble ubiquitinated proteins (IUP) and Ref(2)P (aggregate marker and p62-SQSTM1 homologue) [46]. Our work has primarily focused on the aggregate profiles of aging female flies [9, 13]. In this study we examined the aggregate profiles in head preparations isolated from WT male flies at different ages. As was seen with female flies, the Triton X-100 soluble fraction prepared from males (1-day to 4-weeks) shows only minor age-related changes in ubiquitinated and Ref(2)P protein profiles (Fig 1A). Conversely, we detect a sharp increase in IUP and Ref(2)P levels in the SDS-soluble extracts as early as 2-weeks, which becomes extensive by 4-weeks of age (Fig 1B). The time frame of aggregate accumulation coincides with the decline in clearance pathways [16]. Therefore, in subsequent studies 4-weeks was used as the upper age range to identify and characterize early behavior defects occurring in middle-aged flies.
Sequential protein extracts were prepared from adult male fly heads at different ages (1-day to 4-weeks) and used for Western blot analyses of Ref(2)P and ubiquitinated proteins. The Triton-X Fraction contains the Triton X-100 soluble proteins, while the SDS Fraction identifies the Triton X-100 insoluble/SDS-soluble proteins that have taken on aggregate-like characteristics.
We also used the large activity monitor (LAM) system to examine the effect that group housing or social interactions have on behaviors linked to 24-hr activity profiles. Flies in single sex groups (10 per vial) were assayed using standard 12-hr LD assay conditions. Grouped-housed females (1 to 4-weeks) and young group-housed males (1-week) show activity patterns that are similar to those of single-housed fly cohorts (Fig 3C and 3D). However, we observed that as group-housed male flies age, they show an unexpected change in nighttime behavior patterns (ZT12-24, Fig 3C). Starting as early as 2-weeks, male flies have an increase in nighttime activity, while daytime profiles remain fairly constant (Fig 3C and 3E). By 4-weeks this behavior is further exacerbated during the dark (ZT12-24) and mid-dark (ZT15-21) time periods (Fig 3C and 3E, and S2C and S2D Table). Group-housed female flies show only minor age-related changes to locomotion-based activity, with little to no change in nighttime behaviors (Fig 3D and 3F). This indicates that the male-specific behavior phenotype is revealed under conditions that permit social interactions. Like the age-related decline in the NGR, the timing of this progressive male-specific phenotype also parallels the buildup of neural aggregates in normal aged Drosophila [9, 12]. To confirm the progressive nighttime behavior is not unique to the w1118/+ genotype, we examined group-housed male flies from the Canton-S, w1118y1, and w1118 strains. Indeed, by 4-weeks of age all group-housed males show a significant 3 to 4-fold increase in nighttime (mid-dark) activity when compared to 1-week old cohorts (S3 Fig). 2b1af7f3a8