Questions? Comments? Please contact Dr. Phillip McClean or Christina Johnson.

OVERVIEW
Flythrough Tour
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MOLECULAR PROCESSES
Transcription
Regulated Transcription
mRNA Processing
mRNA Splicing
Translation
Lac Operon
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CELLULAR PROCESSES
Protein Trafficking
Protein Modification
Protein Recycling
Insulin Signaling
Constitutive Secretion
Regulated Secretion
Mitochondrial Protein Transport
Mitosis
Meiosis
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CELLULAR ENERGY CONVERSION
Atp Synthase (Gradients)
Electron Transport Chain
Photosynthesis (Light Reaction)
Photosystem II
Glycolysis (Overview)
Glycolysis (Reactions)
Citric Acid Cycle (Overview)
Citric Acid Cycle (Reactions)
Energy Consumption
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HOME > CONSTITUTIVE SECRETION > ADVANCED LOOK > 1.) GOLGI > 2.) EXOCYTOSIS
Constitutive Secretion: Advanced Look --> 2.) Exocytosis

After leaving the Golgi apparatus, proteins following the constitutive secretion pathway merge with the cell membrane and release their cargo by a process called exocytosis. Clicking on each of the thumbnail images will bring up a larger, labeled version of the described scene.

To see the Flash movie for the following sequence of images, click here.

Upon reaching the cell membrane, the secretory vesicles from the Golgi merge with the plasma membrane of the cell by a process called exocytosis. The cargo proteins they contain are then released into the extracellular matrix, and the lipids and membrane of the vesicles are donated to the plasma membrane.

Certain white blood cells use the constitutive pathway to secrete interleukins, a kind of signaling protein used for intercellular communication between other white blood cells. Interleukins play an important role in the proper function of the immune system.

Other cells, such as fibroblasts, constitutively secrete proteins such as collagen and proteoglycans and help to maintain the structural integrity of connective tissue.

 

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