Intestinal epithelial CD98: an oligomeric and multifunctional protein

Area of Science:

• Cell Biology
• Molecular Biology
• Gastroenterology

Background:

• CD98 is a type II membrane glycoprotein found on intestinal epithelial cells.
• Its C-terminal tail, containing a PDZ-binding domain, is extracellular.
• CD98 forms heterodimers with amino acid transporters.

Purpose of the Study:

• To review the multifunctional roles of CD98 in intestinal epithelia.
• To explore CD98's involvement in extracellular signaling, adhesion, and polarity.
• To discuss CD98's role in amino acid transporter expression and potential involvement in intestinal inflammation.

Main Methods:

• Literature review focusing on CD98 function in intestinal epithelial cells.
• Analysis of molecular orientation and complex formation involving CD98.
• Examination of CD98's association with beta(1)-integrin and ICAM-1.

Main Results:

• CD98 forms a macromolecular complex with amino acid transporters, beta(1)-integrin, and ICAM-1.
• This complex is located in the basolateral membranes of polarized intestinal epithelial cells.
• CD98 influences extracellular signaling, cell adhesion, polarity, and amino acid transport.

Conclusions:

• CD98 is a multifunctional molecule critical for intestinal epithelial cell function.
• Its complex formation impacts key cellular processes including signaling and adhesion.
• CD98 is proposed to have a role in intestinal inflammation, including Inflammatory Bowel Disease (IBD).