Neem leaf glycoprotein directs T-bet-associated type 1 immune commitment.
Neem leaf glycoprotein (NLGP)-mediated immune activation and associated immune polarization was studied. NLGP-induced activation is reflected in upregulation of early activation marker CD69 on lymphocytes, monocytes, and dendritic cells. Activation is also denoted by CD45RO enhancement, with a decrease in CD45RA phenotype and CD62L (L-selectin). NLGP-activated T cells secrete greater amount of signature T-helper (Th)1 cytokines interferon-gamma and a lower amount of the Th2 cytokine interleukin (IL)-4. Similar type 1 directiveness is also observed in antigen-presenting monocytes and dendritic cells by upregulation of IL-12, tumor necrosis factor -alpha and downregulation of IL-10. Creation of the type 1 microenvironment is also assisted by NLGP-induced downregulation of FoxP3(+) T-Reg cells. A type 1-specific transcription factor, T-bet, is upregulated in circulating immune cells after their stimulation with NLGP. In the creation of type 1 immune network, increased phosphorylation of STAT1 and STAT4 with decreased phosphorylation of STAT3 might have significance. We conclude that NLGP may be effective in maintaining normal immune homeostasis by upregulating type 1 response in immunosuppressed hosts, which may have significant role in the induction of host protective antitumor functions.
Bose
Anamika
A
Department of Immunoregulation and Immunodiagnostics, Chittaranjan National Cancer Institute Kolkata, India.
Chakraborty
Krishnendu
K
Sarkar
Koustav
K
Goswami
Shyamal
S
Haque
Enamul
E
Chakraborty
Tathagata
T
Ghosh
Diptendu
D
Roy
Soumyabrata
S
Laskar
Subrata
S
Baral
Rathindranath
R
D000328:Adult; D000818:Animals; D015703:Antigens, CD / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D031601:Azadirachta / Q000737:chemistry*; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis; D003713:Dendritic Cells / Q000187:drug effects / Q000276:immunology; D005260:Female; D006023:Glycoproteins / Q000494:pharmacology*; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D019041:L-Selectin / Q000276:immunology; D037181:Lectins, C-Type; D017493:Leukocyte Common Antigens / Q000276:immunology; D008214:Lymphocytes / Q000187:drug effects / Q000276:immunology; D051379:Mice; D008875:Middle Aged; D009000:Monocytes / Q000187:drug effects / Q000276:immunology; D010766:Phosphorylation; D018515:Plant Leaves / Q000737:chemistry*; D050791:STAT Transcription Factors / Q000378:metabolism; D020825:T-Box Domain Proteins / Q000276:immunology*; D055815:Young Adult; D000098815:T-bet Transcription Factor; D000099192:CD69 Antigens
D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D016207:Cytokines; D006023:Glycoproteins; D007371:Interferon-gamma; D019041:L-Selectin; D037181:Lectins, C-Type; D017493:Leukocyte Common Antigens; D050791:STAT Transcription Factors; D020825:T-Box Domain Proteins; D000098815:T-bet Transcription Factor; D000099192:CD69 Antigens