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Biodistribution and lymph node retention of polysaccharide-based immunostimulating nanocapsules

Identifieur interne : 000189 ( Main/Repository ); précédent : 000188; suivant : 000190

Biodistribution and lymph node retention of polysaccharide-based immunostimulating nanocapsules

Auteurs : RBID : Pascal:14-0094728

Descripteurs français

Pascal (Inist)
- Ganglion lymphatique, Polyoside, Chitosane.

English descriptors

KwdEn :
- Chitosan, Lymph node, Polysaccharide.

Abstract

The adjuvant properties of polyglucosamine/squalene-based nanocapsules (PG-nanocapsules) associated with different subunit antigens has been previously reported. Thus, the aim of the present study was to monitor the biodistribution of PG-nanocapsules and their affinity for the draining lymph nodes after subcutaneous (s.c.) injection. The nanocapsules were efficiently radiolabeled with indium-111 (¹¹¹In) (labeling efficiency of 98%). The diameter and zeta potential values of the unlabeled nanocapsules was preserved after the radiolabeling process and only 20% of the ¹¹¹In dissociated from the nanocapsules after 48 h of incubation in serum. The radiolabeled nanocapsules and the control ¹¹¹ InCl₃ in saline solution (18.5 MBq (500 μCi) in 100 μL) were injected s.c. in New Zealand White rabbits. The γ-scintigraphy imaging analysis revealed a slow clearance of the nanocapsules from the injection site and their progressive accumulation in the popliteal lymph node over time (3.8% ± 1.2 of the injected dose at 48 h). Indeed, the clearance rate of the nanocapsules from the injection site was significantly slower than that of the control (free ¹¹¹ InCl₃), which rapidly drained into systemic circulation and accumulated mainly in excretion organs (i.e. kidneys and liver). In contrast, the biodistribution of nanocapsules was preferably limited to the lymphatic circulation. These results suggest that the immune potentiating effect previously observed for PG-nanocapsules is mainly due to the formation of a depot at the injection site, which was followed by a slow drainage into the lymphatic system and a prolonged retention in the lymph nodes.

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<author><name sortKey="Vicente, Sara" uniqKey="Vicente S">Sara Vicente</name>
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<orgName type="university">Université de Saint-Jacques-de-Compostelle</orgName>
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<author><name sortKey="Goins, Beth A" uniqKey="Goins B">Beth A. Goins</name>
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<author><name sortKey="Sanchez, Alejandro" uniqKey="Sanchez A">Alejandro Sanchez</name>
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<author><name sortKey="Alonso, Mar A J" uniqKey="Alonso M">Mar A J. Alonso</name>
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<author><name sortKey="Phillips, William T" uniqKey="Phillips W">William T. Phillips</name>
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<front><div type="abstract" xml:lang="en">The adjuvant properties of polyglucosamine/squalene-based nanocapsules (PG-nanocapsules) associated with different subunit antigens has been previously reported. Thus, the aim of the present study was to monitor the biodistribution of PG-nanocapsules and their affinity for the draining lymph nodes after subcutaneous (s.c.) injection. The nanocapsules were efficiently radiolabeled with indium-111 (<sup>111</sup>
In) (labeling efficiency of 98%). The diameter and zeta potential values of the unlabeled nanocapsules was preserved after the radiolabeling process and only 20% of the <sup>111</sup>
In dissociated from the nanocapsules after 48 h of incubation in serum. The radiolabeled nanocapsules and the control <sup>111</sup>
 InCl<sub>3</sub>
 in saline solution (18.5 MBq (500 μCi) in 100 μL) were injected s.c. in New Zealand White rabbits. The γ-scintigraphy imaging analysis revealed a slow clearance of the nanocapsules from the injection site and their progressive accumulation in the popliteal lymph node over time (3.8% ± 1.2 of the injected dose at 48 h). Indeed, the clearance rate of the nanocapsules from the injection site was significantly slower than that of the control (free <sup>111</sup>
 InCl<sub>3</sub>
), which rapidly drained into systemic circulation and accumulated mainly in excretion organs (i.e. kidneys and liver). In contrast, the biodistribution of nanocapsules was preferably limited to the lymphatic circulation. These results suggest that the immune potentiating effect previously observed for PG-nanocapsules is mainly due to the formation of a depot at the injection site, which was followed by a slow drainage into the lymphatic system and a prolonged retention in the lymph nodes.</div>
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In) (labeling efficiency of 98%). The diameter and zeta potential values of the unlabeled nanocapsules was preserved after the radiolabeling process and only 20% of the <sup>111</sup>
In dissociated from the nanocapsules after 48 h of incubation in serum. The radiolabeled nanocapsules and the control <sup>111</sup>
 InCl<sub>3</sub>
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 InCl<sub>3</sub>
), which rapidly drained into systemic circulation and accumulated mainly in excretion organs (i.e. kidneys and liver). In contrast, the biodistribution of nanocapsules was preferably limited to the lymphatic circulation. These results suggest that the immune potentiating effect previously observed for PG-nanocapsules is mainly due to the formation of a depot at the injection site, which was followed by a slow drainage into the lymphatic system and a prolonged retention in the lymph nodes.</s0>
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Biodistribution and lymph node retention of polysaccharide-based immunostimulating nanocapsules

Biodistribution and lymph node retention of polysaccharide-based immunostimulating nanocapsules

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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