Combined transcriptome and proteome profiling reveal cell-type-specific functions of Drosophila garland and pericardial nephrocytes

Drosophila nephrocytes are specialised cells that share critical functional, morphological, and molecular features with mammalian podocytes. Accordingly, nephrocytes represent a preferred invertebrate model for human glomerular disease. Here, we established a method for cell-specific isolation of the two types of Drosophila nephrocytes, garland and pericardial cells, from animals of different developmental stages and ages. Mass spectrometry-based proteomics and RNA-Seq-based transcriptomics were applied to characterise the proteome and transcriptome of the respective cells in an integrated and complementary manner. We observed characteristic changes in the proteome and transcriptome due to cellular ageing. Furthermore, functional enrichment analyses suggested that larval and adult nephrocytes, as well as garland and pericardial nephrocytes, fulfil distinct physiological functions. In addition, the pericardial nephrocytes were characterised by transcriptomic and proteomic profiles suggesting an atypical energy metabolism with very low oxidative phosphorylation rates. Moreover, the nephrocytes displayed typical signatures of extensive immune signalling and showed an active antimicrobial response to an infection. Factor-specific comparisons identified novel candidate proteins either expressed and secreted by the nephrocytes or sequestered by them. The data generated in this study represent a valuable basis for a more specific application of the Drosophila model in analysing renal cell function in health and disease.

The Tuning in to Kids parenting program delivered online improves emotion socialization and child behavior in a first randomized controlled trial

Emotion-focused parenting interventions have only rarely been evaluated systematically in Europe. This study investigates the effectiveness of "Tuning in to Kids" (TIK) from Australia delivered online in a randomized controlled trial. TIK is a six-week emotion-focused group parenting program that has shown to improve many aspects of parent emotion socialization as well as child problem behavior in several different countries across cultures. Parents (N = 141) of children between 3 and 6 years of age were included in the study and randomly assigned to an intervention and wait-list control group. The intervention was delivered online due to the worldwide COVID-19 pandemic in spring 2021 (intervention group) and one year later (control group) in Switzerland. Parents' beliefs about emotions, their reported reactions to the child's negative emotions, family emotional climate, and child behavior (internalizing and externalizing) improved after the intervention and stayed better until the 6 months follow-up in the intervention group, but not in the wait-list controls. Adherence to the program was very high. This study shows that parent emotion socialization practice is changeable with small effects even on child behavior and even after online delivery. This possibly makes Tuning in to Kids a promising emotion-focused parenting intervention when delivered online as an interactive group webinar.