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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,...
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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.
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Unique and Conserved Endoplasmic Reticulum Stress Responses in Neuroendocrine Cells.

Karina Rodrigues-Dos-Santos1, Gitanjali Roy1, Anna Geisinger1

  • 1Indiana Biosciences Research Institute, Indianapolis, IN 46202, USA.

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|October 15, 2025
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Summary
This summary is machine-generated.

Endocrine cells face endoplasmic reticulum (ER) stress. This study reveals unique and shared gene expression changes in different endocrine cell types responding to ER stress, offering insights into cell-specific stress management.

Keywords:
ER stresscomputational biologyendocrinologyhormone secretion

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Molecular Biology

Background:

  • Endocrine cells produce hormones vital for physiological regulation.
  • High hormone production makes endocrine cells susceptible to cellular stresses, including endoplasmic reticulum (ER) stress.
  • The unfolded protein response (UPRER) is a key pathway for managing ER stress, but cell type-specific transcriptional responses are poorly understood.

Purpose of the Study:

  • To investigate unique and shared transcriptional responses to ER stress across diverse endocrine cell types.
  • To identify cell type-specific gene expression signatures during the UPRER.
  • To provide a resource for understanding how different endocrine cells cope with ER stress.

Main Methods:

  • Utilized mRNA sequencing to analyze gene expression profiles.
  • Exposed representative endocrine cell lines (β-cells, α-cells, δ-cells, X/A-cells, L-cells, thyrotropes) to a canonical ER stressor (thapsigargin) for 6 and 24 hours.
  • Compared transcriptional changes between cell types and time points.

Main Results:

  • All tested endocrine cell lines exhibited a response to thapsigargin-induced ER stress.
  • Analysis revealed both common and distinct gene expression patterns across the different endocrine cell types.
  • Identified a set of candidate genes with potentially cell type-specific roles in ER stress mitigation.

Conclusions:

  • Endocrine cells display both conserved and unique transcriptional adaptations to ER stress.
  • These findings highlight the complexity of UPRER regulation in a cell type-specific manner.
  • The generated data offers a valuable resource for future research into endocrine cell resilience and dysfunction under stress.