Biology subjects

Majedi, F. S.

Publications and source records attributed to Majedi, F. S..

4 recordsLinked to original sources

bioRxiv2021

Global anti-tumor immunity after localized, bioengineered Treg depletion

Over 90% of deaths from cancer occur due to solid tumors, occurring at a rate of [~]1,500 deaths per day in the US, highlighting a profound and unmet need for new therapies. Solid tumors evade clearance by T cells due to a variety of immunosuppressive properties of the tumor microenvironment. However, this immunosuppression cannot be easily blocked on a global level because systemic activation of the immune system elicits a host of complications. An ideal therapy for solid tumors would act locally to activate the immune response without evoking global adverse effects. Here we present a biodegradable, macroporous scaffold that is implanted adjacent to the tumor and suppresses the main obstacle to cancer immunosurveillance: intratumoral regulatory T cells. The scaffold also promotes the recruitment and activation of T cell effectors into the tumor, resulting in clearance of otherwise aggressive and fatal tumors in mice. Unexpectedly, the local depletion of Tregs results in an "immunological abscopal effect" acting on distant tumors. We demonstrate that this versatile platform can also deliver tumor-antigen-specific T cells directly to the peri-tumoral environment, bypassing difficulties in intravenous delivery including the environmental barriers imposed by the tumors vasculature. By orchestrating multiple local immunomodulatory treatments, this scaffold offers a general approach to engineer T-cell responses to solid tumors without systemic toxicities.

immunology↗

bioRxiv2019

Augmentation of T-cell activation by oscillatory forces and engineered antigen-presenting cells

Activation of T cells by antigen presenting cells allows them to proliferate, produce cytokines, and kill infected or cancerous cells. We and others have shown that T cell receptors receive and in fact require mechanical forces from their own movements and the movements of antigen presenting cells. Emulation of T cell activation in vitro allows for the massive expansion of T cells necessary for clinical applications. In this paper, we studied the impact of augmenting novel artificial antigen presenting cells of various sizes and antigenic signal strength with mechanical, oscillatory movement. We showed that dynamic culture roughly doubles signal strength as compared to conventional, static culture. We demonstrated that tuning the strength of signal to a \"sweet spot\" allows for robust expansion of induced regulatory T cells, which is impeded by approaches that simply maximize activation.

immunology↗

bioRxiv2019

T-cell activation is modulated by the 3D mechanical microenvironment

T cells recognize mechanical forces through a variety of cellular pathways, including mechanical triggering of the T-cell receptor (TCR) and mechanical triggering of the integrin LFA-1. We show here that T cells can recognize forces arising from the rigidity of the microenvironment. We fabricated 3D hydrogels with mechanical stiffness tuned to 4 kPa and 40 kPa and specially engineered be microporous independent of stiffness. We cultured T cells and antigen presenting cells within the matrices and studied activation by flow cytometry and live imaging. We found there was an augmentation of T-cell activation in the context of mechanically stiffer 3D material as compared to the softer material. In contrast, proliferation, activation markers, and migration were all diminished in T cells cultured in the softer material. These results show that T cells can sense their mechanical environment and amplify responses in the context of mechanical stiffness.

immunology↗

bioRxiv2019

Tissue mechanics controls T-cell activation and metabolism

Upon immunogenic challenge, lymph nodes become mechanically stiff as immune cells proliferate within their encapsulated environments, and with resolution, they reestablish a soft, baseline state. We found that these mechanical changes in the microenvironment promote and then restrict T-cell activation and metabolic reprogramming. Sensing of tissue mechanics by T cells requires the mechanosensor YAP. Unlike in other cells where YAP promotes proliferation, YAP in T cells suppresses proliferation in a stiffness-dependent manner by directly restricting the translocation of NFAT into the nucleus. YAP regulates T-cell responses against viral infections and in autoimmune diabetes. Our work reveals a new paradigm whereby tissue mechanics fine-tunes adaptive immune responses in health and disease.\n\nOne Sentence SummaryTissue mechanics regulates T cells.

immunology↗