12 research outputs found
Data_Sheet_1_Selective Targeting of Proteins by Hybrid Polyoxometalates: Interaction Between a Bis-Biotinylated Hybrid Conjugate and Avidin.docx
<p>The Keggin-type polyoxometalate [γ-SiW<sub>10</sub>O<sub>36</sub>]<sup>8−</sup> was covalently modified to obtain a bis-biotinylated conjugate able to bind avidin. Spectroscopic studies such as UV-vis, fluorimetry, circular dichroism, coupled to surface plasmon resonance technique were used to highlight the unique interplay of supramolecular interactions between the homotetrameric protein and the bis-functionalized polyanion. In particular, the dual recognition mechanism of the avidin encompasses (i) a complementary electrostatic association between the anionic surface of the polyoxotungstate and each positively charged avidin subunit and (ii) specific host-guest interactions between each biotinylated arm and a corresponding pocket on the tetramer subunits. The assembly exhibits peroxidase-like reactivity and it was used in aqueous solution for L-methionine methyl ester oxidation by H<sub>2</sub>O<sub>2</sub>. The recognition phenomenon was then exploited for the preparation of layer-by-layer films, whose structural evolution was monitored in situ by ATR-FTIR spectroscopy. Finally, cell tracking studies were performed by exploiting the specific interactions with a labeled streptavidin.</p
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps
C1q-Mediated Complement Activation and C3 Opsonization Trigger Recognition of Stealth Poly(2-methyl-2-oxazoline)-Coated Silica Nanoparticles by Human Phagocytes
Poly(2-methyl-2-oxazoline) (PMOXA)
is an alternative promising polymer to poly(ethylene glycol) (PEG)
for design and engineering of macrophage-evading nanoparticles (NPs).
Although PMOXA-engineered NPs have shown comparable pharmacokinetics
and <i>in vivo</i> performance to PEGylated stealth NPs
in the murine model, its interaction with elements of the human innate
immune system has not been studied. From a translational angle, we
studied the interaction of fully characterized PMOXA-coated vinyltriethoxysilane-derived
organically modified silica NPs (PMOXA-coated NPs) of approximately
100 nm in diameter with human complement system, blood leukocytes,
and macrophages and compared their performance with PEGylated and
uncoated NP counterparts. Through detailed immunological and proteomic
profiling, we show that PMOXA-coated NPs extensively trigger complement
activation in human sera exclusively through the classical pathway.
Complement activation is initiated by the sensing molecule C1q, where
C1q binds with high affinity (<i>K</i><sub>d</sub> = 11
± 1 nM) to NP surfaces independent of immunoglobulin binding.
C1q-mediated complement activation accelerates PMOXA opsonization
with the third complement protein (C3) through the amplification loop
of the alternative pathway. This promoted NP recognition by human
blood leukocytes and monocyte-derived macrophages. The macrophage
capture of PMOXA-coated NPs correlates with sera donor variability
in complement activation and opsonization but not with other major
corona proteins, including clusterin and a wide range of apolipoproteins. In contrast to these observations, PMOXA-coated NPs poorly activated the murine complement system and were marginally recognized by mouse macrophages. These studies provide important insights into compatibility of engineered NPs with elements of the human innate immune system for translational steps