Insulin/Insulin-like growth factor signaling regulates homeostasis and growth in mammals, and is implicated in diseases from diabetes to cancer. In Drosophila melanogaster, as in other invertebrates, multiple Insulin-Like Peptides (DILPs) are encoded by a family of related genes. To assess DILPs' physiological roles, we generated small deficiencies that uncover single or multiple dilps, generating genetic loss-of-function mutations. Deletion of dilps1-5 generated homozygotes that are small, severely growth-delayed, and poorly viable and fertile. These animals display reduced metabolic activity, decreased triglyceride levels and prematurely activate autophagy, indicative of "starvation in the midst of plenty," a hallmark of Type I diabetes. Furthermore, circulating sugar levels are elevated in Df [dilp1-5] homozygotes during eating and fasting. In contrast, Df[dilp6] or Df[dilp7] animals showed no major metabolic defects. We discuss physiological differences between mammals and insects that may explain the unexpected survival of lean, 'diabetic' flies.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2780814 | PMC |
| http://dx.doi.org/10.1073/pnas.0905083106 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The Effect of Long-Term Cryopreservation on the Properties and Functionality of Platelet-Rich Plasma.
Int J Mol Sci
January 2025
Advanced Biological Therapy Unit, Hospital Vithas Vitoria, 01008 Vitoria-Gasteiz, Spain.
Platelet-Rich Plasma (PRP) is a biological treatment widely used in regenerative medicine for its restorative capacity. Although PRP is typically applied at the time of obtention, long-term storage and preservation could enhance its versatility and clinical applications. The objective of this study was to evaluate the effect of long-term freezing on PRP.
View Article and Find Full Text PDFNeuroprotective Effects of VEGF-B in a Murine Model of Aggressive Neuronal Loss with Childhood Onset.
Int J Mol Sci
January 2025
Laboratory of Neuronal Plasticity and Neurorepair, Institute of Neuroscience of Castile and Leon (INCyL), Universidad de Salamanca, 37007 Salamanca, Spain.
In recent decades, the scientific community has faced a major challenge in the search for new therapies that can slow down or alleviate the process of neuronal death that accompanies neurodegenerative diseases. This study aimed to identify an effective therapy using neurotrophic factors to delay the rapid and aggressive cerebellar degeneration experienced by the Purkinje Cell Degeneration (PCD) mouse, a model of childhood-onset neurodegeneration with cerebellar atrophy (CONDCA). Initially, we analyzed the changes in the expression of several neurotrophic factors related to the degenerative process itself, identifying changes in insulin-like growth factor 1 (IGF-1) and Vascular Endothelial Growth Factor B (VEGF-B) in the affected animals.
View Article and Find Full Text PDFDifferential Impact of Medical Therapies for Acromegaly on Glucose Metabolism.
Int J Mol Sci
January 2025
Endocrinology Unit, Department of Internal Medicine and Medical Specialties, School of Medical and Pharmaceutical Sciences, University of Genova, 16132 Genova, Italy.
Acromegaly is a rare endocrine disorder caused by excessive growth hormone (GH) production, due, in the vast majority of cases, to the presence of a GH-secreting pituitary tumour. The chronic elevation of GH and the resulting high circulating levels of insulin-like growth factor-1 (IGF-1) cause the characteristic tissue overgrowth and a number of associated comorbidities, including several metabolic changes, such as glucose intolerance and overt diabetes mellitus (DM). Elevated GH concentrations directly attenuate insulin signalling and stimulate lipolysis, decreasing glucose uptake in peripheral tissues, thus leading to the development of impaired glucose tolerance and DM.
View Article and Find Full Text PDFEffects of Insulin-like Growth Factor 1 on the Maintenance of Cell Viability and Osteogenic Differentiation of Gingiva-Derived Mesenchymal Stem Cell Spheroids.
Medicina (Kaunas)
January 2025
Department of Periodontics, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea.
Insulin-like growth factor-1 (IGF-1) plays a vital role in various cellular processes, including those involving stem cells. This study evaluated the effects of IGF-1 on cell survival, osteogenic differentiation, and mRNA expression in gingiva-derived mesenchymal stem cell spheroids. Using concave microwells, spheroids were generated in the presence of IGF-1 at concentrations of 0, 10, and 100 ng/mL.
View Article and Find Full Text PDF[Therapeutic effect of concentrated growth factors combined with self-curing calcium phosphate cement on periodontal intrabony defects: Clinical and radiographic evaluation].
Beijing Da Xue Xue Bao Yi Xue Ban
February 2025
First Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Enginee-ring Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China.
Objective: To clarify the role of concentrated growth factors (CGF) in the treatment of periodontal cement defects using calcium phosphate cement (CPC) with self-curing properties.
Methods: Thirty-six intrabony defects were randomly divided into two groups. The experimental group received CGF+CPC treatment (=18), while the control group received CPC treatment alone (=18).
Want 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!