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Related Concept Videos

Exocrine Glands: Methods of Secretion01:08

Exocrine Glands: Methods of Secretion

Exocrine glands are those that release their secretions through ducts. Based on their mode of secretion, they can be classified into merocrine, apocrine, and holocrine.
Merocrine Secretion
Merocrine secretion is the most common type of exocrine secretion. The secretions are enclosed in vesicles and moved to the cell's apical surface, where the contents are released by exocytosis. For example, mucous, a watery secretion rich in the glycoprotein mucin, is a merocrine secretion. The eccrine glands...
Classification of Epithelial Tissues: Glandular Epithelium01:20

Classification of Epithelial Tissues: Glandular Epithelium

The glandular epithelium is made of one or more epithelial cells modified to synthesize and secrete chemical substances. Glandular epithelia can be classified based on cell number. Unicellular glands have individual secretory cells scattered across the epithelial monolayer. In contrast, multicellular glands consist of a hollow tubular duct attached to the cluster of secretory cells located in the deep pockets.
Multicellular glands are formed during early development when epithelial budding...
Exocrine Glands: Unicellular and Multicellular Glands01:29

Exocrine Glands: Unicellular and Multicellular Glands

Exocrine glands are classified as unicellular and multicellular. The unicellular glands are scattered single cells, such as goblet cells, found in the mucous membranes of the small and large intestines. On the other hand, multicellular exocrine glands develop as secretory sheets, like the internal lining of the abdomen or chest. Such secretory sheets release their secretions directly into the lumen of these organs. In addition, some multicellular glands have deep-seated secretory units to...
Biosynthesis of Lipids01:29

Biosynthesis of Lipids

Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...
Exocrine Glands: Types of Secretions01:13

Exocrine Glands: Types of Secretions

Exocrine glands produce and release a variety of glandular products. Exocrine glands can be classified into serous, mucous, or mixed types based on their secretory products.
Serous glands produce watery secretions rich in digestive enzymes and proteins. The constituent cells of the serous gland have centrally located nuclei and eosinophilic secretory granules in the cytoplasm. The parotid gland is an example of a serous gland. It secretes saliva, which contains enzymes, such as lipases and...
Accessory Structures of the Skin: Sebaceous Glands01:21

Accessory Structures of the Skin: Sebaceous Glands

A sebaceous gland is a type of oil gland found almost all over the skin ( except palms and soles) and helps lubricate and waterproof the skin and hair. Most sebaceous glands are associated with hair follicles. They generate and excrete sebum, a mixture of lipids, onto the skin surface, thereby naturally lubricating the dry and dead layer of keratinized cells of the stratum corneum, keeping it pliable.
These glands that produce the oils on the skin and hair are holocrine glands. The mature...

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Related Experiment Video

Updated: May 10, 2026

Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland
11:13

Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland

Published on: December 1, 2015

Rethinking holocrine secretion: functional logic in lipid-producing epithelia.

Marlon R Schneider1

  • 1Institute of Veterinary PhysiologyUniversity of Leipzig Leipzig Germany.

American Journal of Physiology. Cell Physiology
|May 8, 2026
PubMed
Summary
This summary is machine-generated.

Holocrine secretion, a process involving cell disintegration, is re-envisioned as a differentiation program. This mechanism couples lipid accumulation, cell death, and barrier function, offering new insights into epithelial cell regulation.

Keywords:
epithelial biologyevolutionholocrine secretionmeibomian glandsebaceous gland

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Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas
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Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas

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Last Updated: May 10, 2026

Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland
11:13

Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland

Published on: December 1, 2015

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas
09:41

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas

Published on: April 1, 2014

Area of Science:

  • Cell Biology
  • Histology
  • Dermatology

Background:

  • Holocrine secretion is traditionally viewed as an unusual mode of glandular secretion.
  • It is characterized by the disintegration of secretory cells and release of cellular contents.
  • Existing descriptions often overlook the biological logic and functional significance of this process.

Purpose of the Study:

  • To reframe the understanding of holocrine secretion beyond its anatomical peculiarity.
  • To explore the biological logic and functional implications of holocrine secretion.
  • To propose holocrine secretion as a differentiation program.

Main Methods:

  • Conceptual analysis of holocrine secretion mechanisms.
  • Integration of findings from cell biology and histology.
  • Comparative analysis of glandular secretion strategies.

Main Results:

  • Holocrine secretion is proposed as a differentiation program coupling lipid accumulation, terminal differentiation, and cell elimination.
  • This process is integral to maintaining surface barrier function.
  • The cellular events in holocrine secretion represent a coordinated biological strategy.

Conclusions:

  • Holocrine secretion is a sophisticated differentiation pathway, not merely an anatomical anomaly.
  • Understanding this program offers insights into epithelial barrier maintenance.
  • This perspective suggests potential therapeutic strategies for controlled epithelial cell removal.