YuDetecting the percent of peripheral blood mononuclear cells displaying p-STAT-3 in malignant glioma patients

William Humphries, Yongtao Wang, Wei Qiao, Chantal Reina-Ortiz, Mohamed K. Abou-Ghazal, Lamonne M. Crutcher, Jun Wei, Ling Yuan Kong, Raymond Sawaya, Ganesh Rao, Jeffrey Weinberg, Sujit S. Prabhu, Gregory N. Fuller, Amy B. Heimberger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Background: The signal transducer and activator of transcription 3 (STAT-3) is frequently overexpressed in cancer cells, propagates tumorigenesis, and is a key regulator of immune suppression in cancer patients. The presence of phosphorylated STAT-3 (p-STAT-3) in the tumor can induce p-STAT-3 in tumor-associated immune cells that can return to the circulatory system. We hypothesized that the number of peripheral blood mononuclear cells (PBMCs) displaying p-STAT-3 would be increased in glioma patients, which would correlate with the extent of tumor-expressed p-STAT-3, and that higher p-STAT-3 levels in peripheral blood would correlate with a higher fraction of immune-suppressive regulatory T cells (Tregs). Methods: We measured the percentage of PBMCs displaying p-STAT-3 in 19 healthy donors and 45 patients with primary brain tumors. The level of p-STAT-3 in tumor tissue was determined by immunohistochemistry. The degree of immune suppression was determined based on the fraction of Tregs in the CD4 compartment. Results: Healthy donors had 4.8 ± 3.6% of PBMCs that expressed p-STAT-3, while the mean proportion of PBMCs displaying p-STAT-3 in patients with GBM was 11.8 ± 13.5% (P = 0.03). We did not observe a correlation by Spearman correlation between the degree of p-STAT-3 levels in the tumor and the percent of PBMCs displaying p-STAT-3. Furthermore, the percent of PBMCs displaying p-STAT-3 in glioma patients was not directly correlated with the fraction of Tregs in the CD4 compartment. Conclusion: We conclude that the percent of PBMCs displaying p-STAT-3 may be increased in malignant glioma patients.

Original languageEnglish (US)
Article number1479
Pages (from-to)92
Number of pages1
JournalJournal of Translational Medicine
Volume7
DOIs
StatePublished - Nov 9 2009
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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