Immune dysfunction in patients with functional gastrointestinal disorders.

Area of Science:

• Immunology
• Gastroenterology
• Cell Biology

Background:

• Growing evidence links immune system dysregulation to functional gastrointestinal disorders (FGIDs).
• FGIDs can arise after infections, with genetic predispositions affecting cytokine production and immune cell presence.

Purpose of the Study:

• To compare cellular and humoral immune responses in FGID patients versus healthy controls.
• To differentiate immune responses between acute and unspecified onset FGIDs.

Main Methods:

• Assessed cytokine production (IL-5, IL-10, IL-13, IFN-gamma, IL-12, TNF-alpha) from stimulated lymphocytes and monocytes.
• Measured serum IL-6 and IL-10.
• Utilized fluorescent-activated cell sorting for immunophenotyping.
• Compared findings between controls, IBS, FD, NCCP, and analyzed acute vs. unspecified onset FGIDs.

Main Results:

• FGID patients (IBS, FD, NCCP) showed enhanced stimulated lymphocyte IL-5 and IL-13 expression compared to controls.
• Reduced stimulated monocytic IL-12 and lymphocytic IL-10 expression were observed in IBS and FD.
• FD patients also had reduced IFN-gamma expression.
• Acute onset FGIDs had higher serum IL-10 and increased CD3(+)CD45RA(+)CD45RO(+) cells.
• FD patients with acute onset showed higher LPS-stimulated TNF-alpha.

Conclusions:

• FGIDs exhibit a shift towards a Th2 cytokine profile.
• Cellular immunophenotypes in FGIDs remain largely unchanged.
• Distinct immune profiles in acute onset FGIDs warrant further investigation for novel therapeutic strategies.