Insulin and Autophagy in Neurodegeneration

Natália Prudente de Mello1, Ana Maria Orellana2, Caio Henrique Mazucanti2

  • 1Laboratory of Molecular and Functional Neurobiology, Department of Pharmacology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.

Insights

Insulin resistance and impaired autophagy are linked in metabolic and neurodegenerative diseases. Modulating these pathways, especially autophagy, may offer new therapeutic targets for neurodegenerative conditions.

Area of Science:

  • Neurobiology
  • Metabolic Disorders
  • Cellular Biology

Background:

  • Metabolic diseases and neurodegenerative disorders share common pathophysiological pathways.
  • Impaired insulin signaling and autophagy are key factors in both conditions.
  • Understanding this crosstalk is crucial for developing novel therapeutic strategies.

Purpose of the Study:

  • To review the role of insulin signaling/resistance and autophagy in neurodegenerative diseases.
  • To discuss potential pharmacological and non-pharmacological interventions targeting these pathways.
  • To highlight the time-dependent nature of therapeutic responses in autophagy modulation.

Main Methods:

  • Literature review focusing on insulin signaling, autophagy, and neurodegeneration.
  • Analysis of studies investigating the interplay between metabolic and neurological health.
  • Synthesis of current research on therapeutic interventions.

Main Results:

  • Insulin resistance and autophagy dysfunction are consistently observed in neurodegenerative conditions.
  • Pharmacological and genetic strategies targeting insulin and autophagy pathways show promise for protein aggregate clearance.
  • The efficacy of these interventions is often dependent on timing and specific pathway modulation.

Conclusions:

  • Targeting insulin signaling and autophagy presents a potential therapeutic avenue for neurodegenerative diseases.
  • Further research into the time-dependent regulation of autophagy is warranted for drug development.
  • A comprehensive approach considering both metabolic and neurological factors is essential.

Related Concept Videos

Autophagy01:27

Autophagy

Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
5.7K
Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
6.4K
Insulin: The Receptor and Signaling Pathways01:28

Insulin: The Receptor and Signaling Pathways

Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
2.9K
Insulin Formulations: Types and Delivery01:27

Insulin Formulations: Types and Delivery

Insulin preparations are categorized by their duration of action into short-acting and long-acting types. Two strategies are used to modify insulin's absorption and pharmacokinetic profile: slowing the absorption post-subcutaneous injection, or altering human insulin's amino acid sequence or protein structure. These changes retain the insulin's ability to bind to the insulin receptor, but alter its behavior in solution or after injection.
Short-acting insulins are divided into...
671
Insulin: Biosynthesis, Chemistry, and Preparation01:25

Insulin: Biosynthesis, Chemistry, and Preparation

The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment...
1.3K
Insulin: Dosing Regimen and Adverse Effects01:16

Insulin: Dosing Regimen and Adverse Effects

Insulin-replacement therapy usually includes both long-acting insulin (basal) and short-acting insulin (to cater to postprandial needs). In a diverse group of type 1 diabetes patients, the average daily insulin dose is typically 0.5-0.7 units/kg body weight. However, obese patients and pubertal adolescents may need more due to insulin resistance.
The basal dose constitutes about 40%-50% of the total daily dose, with the rest as premeal insulin. The mealtime insulin dose should mirror...
705