From:  Human γδ T cells in colorectal carcinoma: friends or foes

 Main features of γδ T cells in humans and mice with pro- or anti-tumor activity.

γδ T cell populationSpeciesModel studyMain featuresMolecules on lymphocytesMolecules/Factors on epithelial cellsRef.
Vγ5MouseHealthy colon β7–/– mice mAb to α4β7 or MAdCAM-1 RALDH deficiencyImpaired localizationCCR9, αEβ7CCL25, E-cadherin[24, 25]
γδ T cells
Vγ7+
MouseHealthy colon, AhR deficient allelesImpaired localizationGranzymes, C-type lectins, GPR18, GPR55IL-7, IL-15, MMP-7[4345]
non-Vδ1-Vδ2
Vγ7
Vγ6
Mouse/HumanSuppressor antitumor cellsCD8α+ PD-1[54, 73]
Vδ1Vγ2+
Vδ1
HumanCRC, FC, IHCIL-17 producer, MDSC recruitmentARG1–2, IDO[48, 50, 5255]
Vδ1 in breast and prostate cancersHumanFC, regulatory activity in vitro and in vivo NOD SCID miceSuppressor cells
IKKα, IKKβ mediated
TLR11, TLR7, TLR8, MyD88TLR8L Poly-G3
ssRNA40
Reversed suppression
[71]
Vδ1HumanCRC, healthy mucosa, FC, TCR seq, IHC, functional in vitro experimentsPotent cytotoxic cells
IFN-γ
NKp46+ NKp44+ NKp30+ NKG2C+
NKG2D CD8α+ CD56 CD16low
Ligands for activatory receptors
IL-2
IL-15
[78]
non-Vδ1-Vδ2
Vδ1, Vδ4
Vδ5, Vδ7
Vδ8
HumanHumanized CRC, MS, FC, TCR seqTGF-β, Galectin 3, AREGLow production of IFN-γNo correlation with stage, MSS or MSI[51, 72]

AhR: aryl hydrocarbon receptor; αEβ7: integrin αE integrin β7; ARG1–2: arginase 1, 2; CCL25: chemokine (C-C motif) ligand 25; CCR9: CC chemokine receptor type 9; FC: flow cytometry; GPR18: G-protein coupled receptor 18; GPR55: G-protein coupled receptor 55; IDO: indoleamine 2,3-dioxygenase; IHC: immunohistochemistry; IKKα: inhibitor of nuclear factor-κB (IκB) kinase α; IKKβ: inhibitor of nuclear factor-κB (IκB) kinase β; MAdCAM: mucosal addressin cell adhesion molecule; MDSC: myeloid derived suppressor cells; MMP-7: matrix metalloproteinase 7; MS: mass spectrometry; MSI: microsatellite instability; MSS: microsatellite stability; Poly-G3: a guanosine-rich, phosphorothioate-modified oligodeoxynucleotide; NOD-SCID: non obese diabetic severe combined immunodeficiency; RALDH: retinal dehydrogenase; ssRNA40: GU-rich single-stranded RNA; TCR-seq: T cell receptor sequencing; TGF: transforming growth factor; TLR8L: toll-like receptor 8 ligand.