Characterization of infiltrating lymphocytes in human benign and malignant prostate tissue

QC 20171024
Immune checkpoint blockade has shown promising results in numerous cancer types. However, in prostate cancer (PC), absent or limited responses have been reported. To investigate further, we compared the phenotype of infiltrating T-cells isolated from prostate tissue from patients with PC (n = 5), benign prostatic hyperplasia (BPH) (n = 27), BPH with concurrent PC (n = 4) and controls (n = 7). The majority of T-cells were CD8+ and had a CCR7-CD45RO+ effector memory phenotype. However, the yield of T-cells isolated from PC lesions was on average 20-fold higher than that obtained from control prostates. Furthermore, there were differences between the prostate conditions regarding the percentage of T-cells expressing several activation markers and co-inhibitory receptors. In conclusion, many prostateinfiltrating T-cells express co-inhibitory receptors PD-1 and LAG-3, regardless of prostate condition. Despite the observed increase in counts and percentages of PD- 1+ T-cells in PC, the concomitant demonstration of high percentage of PD-1+ T-cells in control prostates suggests that PD-1 may play a role in controlling the homeostasis of the prostate rather than in contributing to PC-associated immune-suppression. Thus, PD-1 may not be a good candidate for checkpoint blockade in PC and these data are relevant for evaluation of clinical trials and in designing future immunotherapeutic approaches of PC.

Egevad, L.Karolinska Institutet (författare)
Jorns, C.Karolinska Institutet (författare)
Mattsson, J.Karolinska Institutet (författare)
Sundberg, B. (författare)
Nava, S.Karolinska Institutet (författare)
Ericzon, B. -GKarolinska Institutet (författare)
Henningsohn, L.Karolinska Institutet (författare)
Levitsky, V. (författare)
Uhlin, MichaelKTH,Cellulär biofysik,Karolinska Institutet, Sweden(Swepub:kth)u1ira0gr (författare)
Karolinska InstitutetCellulär biofysik (creator_code:org_t)

Av författaren/redakt...: Rådestad, E.; Egevad, L.; Jorns, C.; Mattsson, J.; Sundberg, B.; Nava, S.; visa fler...; Ericzon, B. -G; Henningsohn, L.; Levitsky, V.; Uhlin, Michael; visa färre...

Om ämnet

MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Klinisk medicin; och Cancer och onkol ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.