Related Experiment Video

Updated: May 11, 2026

In Situ Immunofluorescent Staining of Autophagy in Muscle Stem Cells
08:35

In Situ Immunofluorescent Staining of Autophagy in Muscle Stem Cells

Published on: June 12, 2017

Regulation of cardiac autophagy by insulin-like growth factor 1

Rodrigo Troncoso1, Jessica Díaz-Elizondo, Sandra P Espinoza

  • 1Centro de Estudios Moleculares de la Célula, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile.

IUBMB Life
|May 15, 2013
PubMed

Insights

Insulin-like growth factor-1 (IGF-1) protects the heart by improving mitochondrial function and energy levels. It also reduces cell death and manages excessive autophagy during nutritional stress.

Area of Science:

  • Cardiovascular Biology
  • Cellular Metabolism
  • Molecular Signaling

Background:

  • Insulin-like growth factor-1 (IGF-1) signaling is crucial for cardiomyocyte growth and survival.
  • Key IGF-1 pathways in the heart include Akt/mTOR, Ras/Raf/ERK (survival), and PLC/InsP3/Ca(2+) (metabolism, gene transcription).
  • Autophagy, a cellular degradation process, plays a dual role (adaptive/maladaptive) in cardiac pathologies under stress.

Purpose of the Study:

  • To review the roles of IGF-1 signaling and autophagy in cardiomyocytes experiencing nutritional stress.
  • To test the hypothesis that IGF-1 protects the heart by enhancing mitochondrial metabolism and energetics.
  • To investigate IGF-1's role in reducing cell death and modulating autophagy during nutritional stress.

Main Methods:

  • Literature review of IGF-1 signaling pathways (Akt/mTOR, Ras/Raf/ERK, PLC/InsP3/Ca(2+)).
  • Analysis of autophagy's function in cardiac stress and nutritional deficiency.
  • Examination of IGF-1's proposed protective mechanisms against cellular stress.

Main Results:

  • IGF-1 signaling arms differentially regulate cardiac survival and metabolism.
  • Autophagy's context-dependent role in heart disease is highlighted.
  • The hypothesis posits IGF-1 protects cardiac mitochondria, energetics, and cell survival while controlling autophagy.

Conclusions:

  • IGF-1 signaling is vital for maintaining cardiac health under stress.
  • Understanding IGF-1 and autophagy interplay is critical for managing heart conditions.
  • IGF-1 may offer a therapeutic strategy for cardiac protection against nutritional stress.

More Related Videos

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy07:20

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

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,...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
Autophagic Cell Death01:18

Autophagic Cell Death

Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...