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Tissue distribution of the non-polymorphic major histocompatibility complex class I-like molecule, CD1d
P W Canchis1, A K Bhan, S B Landau
1Gastroenterology Division, Brigham and Women's Hospital, Boston, MA 02115.
Immunology
|December 1, 1993
Summary
The CD1d molecule is widely expressed in various human tissues, distinct from other CD1 proteins. This unique distribution suggests a specialized role for CD1d in the immune system.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- The CD1 gene family includes five molecules (CD1a-e).
- CD1a, b, and c show primary thymic expression with limited extrathymic presence.
- Previous research indicated CD1d's extrathymic expression in specific cells like gastrointestinal and renal epithelial cells, and B cells.
Purpose of the Study:
- To comprehensively characterize the tissue distribution of CD1d in various human tissues.
- To compare the expression pattern of CD1d with CD1a-c and major histocompatibility complex (MHC) proteins.
Main Methods:
- Immunohistochemistry was employed to detect CD1d expression.
- Two anti-human CD1d monoclonal antibodies (mAbs) were utilized for detection.
- Expression analysis was performed across a diverse range of human tissue samples.
Main Results:
- CD1d was detected in numerous tissues, including the intestine, liver, pancreas, skin, kidney, uterus, conjunctiva, epididymis, thymus, and tonsil.
- Within these tissues, CD1d was predominantly found in epithelial cells, vascular smooth muscle cells, and parenchymal cells.
- The observed tissue distribution of CD1d differs significantly from CD1a-c and classical MHC proteins.
Conclusions:
- CD1d exhibits a broad tissue distribution distinct from other CD1 family members and MHC proteins.
- This unique expression pattern implies a specialized and potentially novel function for CD1d within the immune system.
- Further investigation into CD1d's specific immunological roles is warranted based on its widespread tissue presence.