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The Endoplasmic Reticulum

The Endoplasmic Reticulum

The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...

Endoplasmic Reticulum

Endoplasmic Reticulum

The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage to biomolecule synthesis. A primary component of the endomembrane system, the ER manufactures phospholipids critical for membrane function throughout the cell. Additionally, the two distinct regions of the ER specialize in the manufacture of specific lipids and proteins.

Assembly of the Lipid Bilayer in the ER

Assembly of the Lipid Bilayer in the ER

Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...

Golgi Apparatus

Golgi Apparatus

As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.

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Related Experiment Video

Updated: Jan 7, 2026

Visualization of Caenorhabditis elegans Cuticular Structures Using the Lipophilic Vital Dye DiI

Visualization of Caenorhabditis elegans Cuticular Structures Using the Lipophilic Vital Dye DiI

Published on: January 30, 2012

Endoplasmic reticulum patterns insect cuticle nanostructure.

Sachi Inagaki^1,2, Housei Wada¹, Takeshi Itabashi^3,4

¹Laboratory for Morphogenetic Signaling, RIKEN Center for Biosystems Dynamics Research , Kobe, Japan.

The Journal of Cell Biology

|December 31, 2025

Summary

This summary is machine-generated.

Researchers uncovered how insect cuticles form nanopores using a novel ER-plasma membrane interaction. This process, involving ER-phagy, reveals insights into insect nanopatterning and genetic control for biomimetic applications.

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Area of Science:

Cell Biology
Biomimetics
Materials Science

Background:

Insect cuticles possess nano-level structures with functional properties, inspiring biomimetic applications.
Cellular mechanisms underlying cuticular nanopatterning are not well understood.
The Drosophila gene gore-tex/Osiris23 (gox) is known to control nanopore formation in olfactory organs.

Purpose of the Study:

To elucidate the cellular mechanisms of nanopore formation in insect cuticles.
To investigate the role of the ER-resident protein Gox in cuticular nanopatterning.
To understand the genetic control of nanoscale extracellular matrix structure fabrication.

Main Methods:

3D electron microscopy imaging of entire insect hair structures.
Analysis of the interaction between the endoplasmic reticulum (ER) and plasma membrane trafficking.
Investigating the role of ER-phagy and its regulators (Gox, Ref(2)P, Dynamin).

Main Results:

Nanopore formation involves a novel bidirectional interaction between the ER and plasma membrane.
ER-resident protein Gox stimulates ER-phagy via Ref(2)P and initiates endocytosis.
Dynamin mediates endocytosis and sustains ER-phagy, contributing to nanopatterning.

Conclusions:

ER-phagy is repurposed for plasma membrane remodeling and nanoscale structure fabrication.
This study reveals a novel mechanism for insect cuticular nanopatterning.
Findings provide insights into the genetic control of biomimetic nanoscale structures.