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Open Access Research article

An orally active immune adjuvant prepared from cones of Pinus sylvestris, enhances the proliferative phase of a primary T cell response

William Guy Bradley1*, Katharine Nichole Holm2 and Akiko Tanaka1

Author Affiliations

1 Tampa Bay Research Institute, 10900 Roosevelt Blvd N, St. Petersburg, FL 33716, USA

2 Eckerd College, 4200 54th Ave South, St. Petersburg, FL 33711, USA

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BMC Complementary and Alternative Medicine 2014, 14:163  doi:10.1186/1472-6882-14-163

Published: 22 May 2014

Abstract

Background

We have previously demonstrated that an alkaline extract of shredded pinecones yields a polyphenylpropanoid polysaccharide complex (PPC) that functions as an orally active immune adjuvant. Specifically, oral PPC can boost the number of antigen-specific memory CD8+ T cells generated in response to a variety of vaccine types (DNA, protein, and dendritic cell) and bias the response towards one that is predominately a T helper 1 type.

Methods

An immune response was initiated by intraperitoneal injection of mice with Staphylococcus enterotoxin B (SEB). A group of mice received PPC by gavage three times per day on Days 0 and 1. The draining lymph nodes were analyzed 48–96 h post-injection for the numbers of reactive T cells, cytokine production, the generation of reactive oxygen species, and apoptotsis.

Results

In this study we examined whether the ability of PPC to boost a T cell response is due to an effect on the proliferative or contraction phases, or both, of the primary response. We present data to demonstrate that oral PPC significantly enhances the primary T cell response by affecting the expansion of T cells (both CD4 and CD8) during the proliferative phase, while having no apparent effects on the activation-induced cell death associated with the contraction phase.

Conclusions

These findings suggest that PPC could potentially be utilized to enhance the T cell response generated by a variety of prophylactic and therapeutic vaccines designed to target a cellular response.

Keywords:
Polyphenylpropanoid polysaccharide complex; Primary T cell response; Pine cone extract