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In this study, we investigated the ability of the major envelope glycoprotein of HIV , glycoprotein 120 ( gp120 ), to regulate intercellular adhesion molecule-1 ( ICAM-1 ) expression in glial cells , because ICAM-1 is important in mediating immune responsiveness in the CNS , facilitating entry of HIV -infected cells into the CNS , and promoting syncytia formation.
 glial cells, HIV -infected cells, ICAM-1, major envelope glycoprotein, intercellular adhesion molecule-1, glycoprotein 120, gp120, ICAM-1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 glial cells, HIV -infected cells, ICAM-1, major envelope glycoprotein, intercellular adhesion molecule-1, glycoprotein 120, gp120, ICAM-1