Related Experiment Video
Updated: May 12, 2026
Modeling Paracrine Noncanonical Wnt Signaling In Vitro
Published on: December 10, 2021
Secretion and extracellular space travel of Wnt proteins
Julia Christina Gross1, Michael Boutros
1German Cancer Research Center (DKFZ), Division of Signaling and Functional Genomics, Heidelberg University, Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg, Germany.
Abstract:
Wnt signaling pathways control many processes during development, stem cell maintenance and homeostasis, and their aberrant regulation has been linked to diseases in man including diabetes, neurodegeneration and cancer. Wnts are hydrophobic proteins, however, quite paradoxically, they can travel over distances to induce cell-type specific responses. While there has been an initial focus on elucidating the intracellular signaling cascade, discoveries in the past few years have shed light on a highly complex, and regulated secretory process that guides Wnt proteins through the exocytic pathway. Wnt proteins are at least in portion packaged onto extracellular carriers such as exosomes. Similar to dysregulation of components in the Wnt receiving cell, failure to regulate Wnt secretion has been linked to cancer. Here, we review recent discoveries on factors and processes implicated in Wnt secretion.
Insights
Wnt proteins, crucial for development and cell regulation, are secreted via a complex pathway, often using extracellular carriers like exosomes. Dysregulated Wnt secretion is linked to diseases, particularly cancer.
Area of Science:
- Cell biology
- Molecular biology
- Developmental biology
Background:
- Wnt signaling pathways regulate critical cellular processes including development, stem cell maintenance, and homeostasis.
- Aberrant regulation of Wnt signaling is implicated in various human diseases such as diabetes, neurodegeneration, and cancer.
- Wnt proteins, despite being hydrophobic, travel long distances to elicit cell-specific responses, indicating a regulated transport mechanism.
Purpose of the Study:
- To review recent discoveries concerning the factors and processes involved in Wnt protein secretion.
- To highlight the complexity and regulation of the Wnt secretory pathway.
- To underscore the link between Wnt secretion dysregulation and diseases like cancer.
Main Methods:
- Literature review of recent scientific discoveries.
- Analysis of studies focusing on the exocytic pathway of Wnt proteins.
- Examination of Wnt protein packaging onto extracellular carriers, such as exosomes.
Main Results:
- Wnt proteins are secreted through a highly complex and regulated exocytic pathway.
- Wnt proteins are, at least partially, packaged onto extracellular carriers, including exosomes.
- Failure in regulating Wnt secretion is associated with disease development, mirroring issues seen with dysregulated intracellular Wnt signaling.
Conclusions:
- The regulation of Wnt secretion is a critical aspect of Wnt signaling.
- Extracellular carriers like exosomes play a role in Wnt protein transport.
- Understanding Wnt secretion mechanisms is vital for addressing associated diseases, especially cancer.
Related Concept Videos
01:41Non-Canonical Wnt Signaling Pathways
01:41Non-Canonical Wnt Signaling Pathways
02:54Canonical Wnt Signaling Pathway
02:54Canonical Wnt Signaling Pathway
01:33Overview of Secretory Vesicles
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
00:50Exocytosis
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...