ENH spruce up the T cell activation section

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Nathan Dwarshuis 2021-08-02 17:25:12 -04:00
parent 2be5c4ab2f
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2 changed files with 100 additions and 43 deletions

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@ -2339,6 +2339,40 @@ CONCLUSIONS: We developed a simplified, semi-closed system for the initial selec
publisher = {Springer Science and Business Media {LLC}}, publisher = {Springer Science and Business Media {LLC}},
} }
@InCollection{Azuma2019,
author = {Miyuki Azuma},
booktitle = {Co-signal Molecules in T Cell Activation},
publisher = {Springer Singapore},
title = {Co-signal Molecules in T-Cell Activation},
year = {2019},
pages = {3--23},
doi = {10.1007/978-981-32-9717-3_1},
}
@Article{Luckheeram2012,
author = {Rishi Vishal Luckheeram and Rui Zhou and Asha Devi Verma and Bing Xia},
journal = {Clinical and Developmental Immunology},
title = {{CD}4+ T Cells: Differentiation and Functions},
year = {2012},
pages = {1--12},
volume = {2012},
doi = {10.1155/2012/925135},
publisher = {Hindawi Limited},
}
@Article{OConnor2012,
author = {Roddy S. O'Connor and Xueli Hao and Keyue Shen and Keenan Bashour and Tatiana Akimova and Wayne W. Hancock and Lance C. Kam and Michael C. Milone},
journal = {The Journal of Immunology},
title = {Substrate Rigidity Regulates Human T Cell Activation and Proliferation},
year = {2012},
month = {jun},
number = {3},
pages = {1330--1339},
volume = {189},
doi = {10.4049/jimmunol.1102757},
publisher = {The American Association of Immunologists},
}
@Comment{jabref-meta: databaseType:bibtex;} @Comment{jabref-meta: databaseType:bibtex;}
@Comment{jabref-meta: grouping: @Comment{jabref-meta: grouping:

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@ -783,7 +783,7 @@ operator to load, feed, and harvest the cell product. Grex bioreactors have been
using to grow \glspl{til}\cite{Jin2012} and virus-specific T using to grow \glspl{til}\cite{Jin2012} and virus-specific T
cells\cite{Gerdemann2011}. cells\cite{Gerdemann2011}.
\subsection{overview of T cell quality} \subsection{overview of T cell quality}\label{sec:background_quality}
T cells are highly heterogeneous and can exist in a variety of states and T cells are highly heterogeneous and can exist in a variety of states and
subtypes, many of which can be measured (at least indirectly) though biomarkers subtypes, many of which can be measured (at least indirectly) though biomarkers
@ -840,49 +840,74 @@ using retro- or lentiviral vectors as their means of gene-editing must be tested
for replication competent vectors\cite{Wang2013} and for contamination via for replication competent vectors\cite{Wang2013} and for contamination via
bacteria or other pathogens. bacteria or other pathogens.
\subsection*{current T cell manufacturing technologies} \subsection*{T cell activation}
Despite these success of T cell therapies (especially \gls{car} T cell % Despite these success of T cell therapies (especially \gls{car} T cell
therapies) they are constrained by an expensive and difficult-to-scale % therapies) they are constrained by an expensive and difficult-to-scale
manufacturing process\cite{Roddie2019, Dwarshuis2017}. % manufacturing process\cite{Roddie2019, Dwarshuis2017}.
Of critical concern, state-of-the-art manufacturing techniques focus only on In order for T cells to be expanded \exvivo{} they must be activated with a
Signal 1 and Signal 2-based activation via \acd{3} and \acd{28} \glspl{mab}, stimulatory signal (Signal 1) and a costimulatory signal (Signal 2). \invivo{}
typically presented on a microbead (Invitrogen Dynabead, Miltenyi MACS beads) or Signal 1 is administered via the \gls{tcr} and the CD3 receptor when \glspl{apc}
nanobead (Miltenyi TransACT), but also in soluble forms in the case of antibody present a peptide via \gls{mhc} that the T cell in question is able to
tetramers (Expamer)\cite{Wang2016, Piscopo2017, Roddie2019, Bashour2015}. These recognize. Signal 2 is administered via CD80 and CD86 which are also present on
strategies overlook many of the signaling components present in the secondary \glspl{apc} and is necessary to prevent the T cell from becoming anergic. While
lymphoid organs where T cells normally expand. Typically, T cells are activated these two signal are the bare minimum to trigger a T cell to expand, there are
under close cell-cell contact via \glspl{apc} such as \glspl{dc}, which present many other potential signals present. T cells have many other costimulatory
peptide-\glspl{mhc} to T cells as well as a variety of other costimulatory receptors such as OX40, 4-1BB and ICOS which are costimulatory along with CD28,
signals. These close quarters allow for efficient autocrine/paracrine signaling and \glspl{apc} have corresponding ligands for these depending on the nature of
among the expanding T cells, which secrete gls{il2} and other cytokines to the pathogen they have detected\cite{Azuma2019}. Furthermore, T cells exist in
assist their own growth. high cell density within the secondary lymphoid organs, which allows efficient
cytokine cross-talk in an autocrine and paracrine manner. These cytokines are
responsible for expansion (in the case of \il{2}) and subset differentiation (in
the case of many others)\cite{Luckheeram2012}. By tuning the signal strength and
duration of Signal 1, Signal 2, the various costimulatory signals, and the
cytokine milieu, a variety of T cell phenotypes can be actualized.
A variety of solutions have been proposed to make the T cell expansion process \invitro{}, T cells can be activated in a number of ways but the simplest and
more physiological. One strategy is to use modified feeder cell cultures to most common is to use \glspl{mab} that cross-link the CD3 and CD28 receptors,
provide activation signals similar to those of \glspl{dc}\cite{Forget2014}. which supply Signal 1 and Signal 2 without the need for antigen (which also
While this has the theoretical capacity to mimic several key components of the means all T cells are activated and not just a few specific clones). Additional
lymph node, it is hard to reproduce on a large scale due to the complexity and signals may be supplied in the form of cytokines (eg \il{2}, \il{7}, or \il{15})
inherent variability of using cell lines in a fully \gls{gmp}-compliant manner. or feeder cells\cite{Forget2014}.
Others have proposed biomaterials-based solutions to circumvent this problem,
including lipid-coated microrods\cite{Cheung2018}, 3D-scaffolds via either
Matrigel\cite{Rio2018} or 3d-printed lattices\cite{Delalat2017}, ellipsoid
beads\cite{meyer15_immun}, and \gls{mab}-conjugated \gls{pdms}
beads\cite{Lambert2017} that respectively recapitulate the cellular membrane,
large interfacial contact area, 3D-structure, or soft surfaces T cells normally
experience \textit{in vivo}. While these have been shown to provide superior
expansion compared to traditional microbeads, no method has been able to show
preferential expansion of functional memory and CD4 T cell populations.
Generally, T cells with a lower differentiation state such as memory cells have
been shown to provide superior anti-tumor potency, presumably due to their
higher potential to replicate, migrate, and engraft, leading to a long-term,
durable response\cite{Xu2014, Gattinoni2012, Fraietta2018, Gattinoni2011}.
Likewise, CD4 T cells are similarly important to anti-tumor potency due to their
cytokine release properties and ability to resist exhaustion\cite{Wang2018,
Yang2017}, and no method exists to preferentially expand the CD4 population
compared to state-of-the-art systems.
As this is a critical unit operation in the manufacturing of T cell therapies, a
number of commercial technologies exist to activate T cells\cite{Wang2016,
Piscopo2017, Roddie2019, Bashour2015}. The simplest is to use \acd{3} and
\acd{28} \gls{mab} bound to a 2D surface such as a plate, and this can be
ackomplished in a \gls{gmp} manner as soluble \gls{gmp}-grade \glspl{mab} are
commericially available. A similar but distinct method along these lines is to
use multivalent activators such as ImmunoCult (StemCell Technologies) or Expamer
(Juno Therapeutics) which may have increased cross-linking capacity compared to
traditional \glspl{mab}. Beyond soluble protein, \glspl{mab} against CD3 and
CD28 can be mounted on magnetic microbeads (\SIrange{3}{5}{\um} in diameter)
such as DynaBeads (Invitrogen) and MACSbeads (\miltenyi{}), which are easier to
separate using magnetic washing plates. Magnetic nanobeads such as TransAct
(\miltenyi{}) work by a similar principle except they can be removed via
centrifugation rather than a magnetic washing plate. Cloudz (RnD Systems) are
another bead-based T cell expansion which mounts \acd{3} and \acd{28}
\glspl{mab} on alginate microspheres, which are not only easily degradable but
are also softer, which can have a positive impact on T cell activation and
phenotype\cite{Lambert2017, OConnor2012}.
A problem with all of these commercial solutions is that they only focus on
Signal 1 and Signal 2 and ignore the many other physiological cues present in
the secondary lymphoid organs. A variety of novel T cell activation and
expansion solutions have been proposed to overcome this. One strategy is to use
modified feeder cell cultures to provide activation signals similar to those of
\glspl{dc}\cite{Forget2014}. While this has the theoretical capacity to mimic
several key components of the lymph node, it is hard to reproduce on a large
scale due to the complexity and inherent variability of using cell lines in a
fully \gls{gmp}-compliant manner. Others have proposed biomaterials-based
solutions to circumvent this problem, including lipid-coated
microrods\cite{Cheung2018}, 3D-scaffolds via either Matrigel\cite{Rio2018} or
3d-printed lattices\cite{Delalat2017}, ellipsoid beads\cite{meyer15_immun}, and
\gls{mab}-conjugated \gls{pdms} beads\cite{Lambert2017} that respectively
recapitulate the cellular membrane, large interfacial contact area,
3D-structure, or soft surfaces T cells normally experience \textit{in vivo}.
While these are in theory much easier to produce and \gls{qc} compared to feeder
cells, none have been demonstrated to demonstrably expand high quality T cells
as outlined in \cref{sec:background_quality}.
\subsection*{integrins and T cell signaling} \subsection*{integrins and T cell signaling}
@ -922,8 +947,6 @@ stimulated in the presence of collagen I\cite{Boisvert2007}.
\subsection*{the role of IL15 in memory T cell proliferation} \subsection*{the role of IL15 in memory T cell proliferation}
% get lots of sources from here: https://www.sciencedirect.com/science/article/pii/S0165247809002387
\il{15} is a cytokine that is involved with the proliferation and homeostasis of \il{15} is a cytokine that is involved with the proliferation and homeostasis of
memory T cells. Its role in the work of this dissertation is the subject of memory T cells. Its role in the work of this dissertation is the subject of
further exploration in \cref{aim2b}. further exploration in \cref{aim2b}.
@ -1000,7 +1023,7 @@ possible. While there are many types of \glspl{doe} depending on the nature
of the parameters and the goal of the experimenter, they all share common of the parameters and the goal of the experimenter, they all share common
principles: principles:
% BACKGROUND cite montgomery, because I feel like it % BACKGROUND cite wu hamada... because I feel like it
\begin{description} \begin{description}
\item [randomization --] The order in which the runs are performed should \item [randomization --] The order in which the runs are performed should
ideally be as random as possible. This is to mitigate against any confounding ideally be as random as possible. This is to mitigate against any confounding