Some literature sources have also cited it as the CD6 ligand (CD6L). It is expressed on activated T cells, activated monocytes, epithelial cells, fibroblasts, neurons, melanoma cells, and also in sweat and sebaceous glands.[citation needed] CD166 protein expression is reported to be upregulated in a cell line deriving from a metastasizing melanom--a.[7] CD166 plays an important role in mediating adhesion interactions between thymic epithelial cells and CD6+ cells during intrathymic T cell development.[citation needed]
Recently, CD166 has also been used as a potential cancer stem cell marker.[citation needed]
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Singer NG, Mitra R, Lialios F, et al. (1998). "CD6 dependent interactions of T cells and keratinocytes: functional evidence for a second CD6 ligand on gamma-interferon activated keratinocytes". Immunol. Lett. 58 (1): 9–14. doi:10.1016/S0165-2478(97)02707-7. PMID9436462.
Cortés F, Deschaseaux F, Uchida N, et al. (1999). "HCA, an immunoglobulin-like adhesion molecule present on the earliest human hematopoietic precursor cells, is also expressed by stromal cells in blood-forming tissues". Blood. 93 (3): 826–37. doi:10.1182/blood.V93.3.826. PMID9920831.
Tomita K, van Bokhoven A, Jansen CF, et al. (2000). "Coordinate recruitment of E-cadherin and ALCAM to cell-cell contacts by alpha-catenin". Biochem. Biophys. Res. Commun. 267 (3): 870–4. doi:10.1006/bbrc.1999.2040. PMID10673383.
Kristiansen G, Pilarsky C, Wissmann C, et al. (2003). "ALCAM/CD166 is up-regulated in low-grade prostate cancer and progressively lost in high-grade lesions". Prostate. 54 (1): 34–43. doi:10.1002/pros.10161. PMID12481253. S2CID22749852.
Zhang H, Li XJ, Martin DB, Aebersold R (2003). "Identification and quantification of N-linked glycoproteins using hydrazide chemistry, stable isotope labeling and mass spectrometry". Nat. Biotechnol. 21 (6): 660–6. doi:10.1038/nbt827. PMID12754519. S2CID581283.
Verma A, Shukla NK, Deo SV, et al. (2005). "MEMD/ALCAM: a potential marker for tumor invasion and nodal metastasis in esophageal squamous cell carcinoma". Oncology. 68 (4–6): 462–70. doi:10.1159/000086989. PMID16024937. S2CID25355369.