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Lymphatic Transport and Lymph Node Location of Microspheres Subcutaneously Injected in the Vicinity of Tumors in a Rabbit Model of Breast Cancer

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Abstract

Purpose

To assess the lymphatic transport of microparticles of 100 nm, 1 μm and 10 μm subcutaneously injected into the breast area of healthy and tumor-bearing rabbits, and to analyze their location in lymph node (LN) in relation to malignant cells.

Methods

Female rabbits (n = 9) bearing a VX2 tumor in one thoracic mammary gland were subcutaneously injected at D15 with polystyrene fluorescent particles around the nipple, on the tumor and on the healthy sides. The tumor and the LN measured by ultrasound at D9, D15 and D20 were explanted at D20. The LN metastases were evaluated by cytokeratin staining. LN uptake of the particles was measured by quantifying the green fluorescence surface in hot spot regions of healthy and pathologic LN.

Results

All animals developed mammary tumors. Metastases were found in 39% of LN from the tumor side. LN invasion was significantly lower for the 10 μm group versus the 100 nm group (p < 0.0348). The fully invaded area of metastatic LN contained significantly less 100 nm and 1 μm particles compared to the low and non-invaded regions and to the healthy LN. In the invaded LN, the 1 μm MS occupied more surface than the 100 nm particles.

Conclusions

1 μm MS arrived numerously into the areas low-invaded and non-invaded by the tumoral cells of the pathologic LN, but they were very rare in the fully invaded regions. Compared to the 100 nm nanospheres, the 1 μm were better retained (20 times) into the sentinel LN, showing the advantage of micrometric particles for lymph-targeted chemotherapy when injected before complete invasion by metastases.

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Abbreviations

DDS:

Drug delivery system

KW:

Kruskal Wallis test

LN:

Lymphnode

mAb:

Monoclonal antibody

MS:

Microspheres

MW:

Mann-Whitney U test

NP:

Nanoparticles

PBS:

Phosphate buffered saline

PLGA:

Poly(lactic-co-glycolic acid)

SLN:

Sentinel lymph node

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Acknowledgments and Disclosures

We thank Celine Urien from Molecular Virology and Immunology Laboratory and Pierre Adenot from the Microscopy and Imaging of the Microrganismes, Animals and Aliments Platform (MIMA2) from the French National Institut of Agricultural Research (INRA) Jouy en Josas for the technical support in confocal imaging acquisition.

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Correspondence to Florentina Pascale.

Electronic supplementary material

Fig. S1

-supplementary data. The intensity of the fluorescence and the diameter of the particles was analyzed with Zen Lite 2.3 Karl Zeiss Microscopy GmBH,2011 Software on 5 isolated 1 μm (A, B) and 10 μm (C,D) microspheres on confocal images from healthy lymphnodes stained with TO-PRO3 for nuclei. The size of the particles measured was close to the size indicated by the manufacturer (1.015 ± 0.072 μm for 1 μm MS and 10.35 ± 0.19 μm for 10 μm MS) (B). The intensity of the fluorescence was not different between 1 μm and 10 μm particles (252 ± 6,8 vs 255)(p < 0,1100, MW) (D). (PNG 1014 kb)

High resolution image (TIF 1412 kb)

Fig. S2

-supplementary data. The nanoparticles were found into the LN only as clusters and not as single particles (A).The intensity of the fluorescence and the diameter of clusters were analyzed with Zen Lite 2.3 Karl Zeiss Microscopy GmBH, 2011 Software on 5 isolated clusters of 0.1 μm (A,B) and 1 μm microspheres (C,D) on confocal images from healthy lymphnodes stained with TO-PRO3 for nuclei. The diameter of the 0.1 μm clusters was 1.79 ± 0.42 and that corresponded to almost 17 nanoparticles, each particle visualized on the intensity profile as peak of fluorescence (white arrow, Fig. A, B). The diameter of the 1 μm clusters was 5 ± 3.19 μm and corresponded to clusters formed by 3–8 particles, each particle visualized on the fluorescence intensity profile as peak of fluorescence (white arrow, Fig. B,C). The intensity of the fluorescence was not different between the clusters of 0.1 μm and 1 μm (222.6 ± 28 vs 215.8 ± 33)(p < 0.1116, MW) (D). (PNG 1137 kb)

High resolution image (TIF 1577 kb)

Fig. S3

At day 5 the skin was sampled and epifluorescence analysis was performed to observe the presence of the particles at the site of injection. Slides were stained with DAPI for nuclei and mounted with Vectashield mounting medium (Vector Laboratories, Burlingame, CA, USA) and examined under ×100 magnification for particle detection. The particles were still observed at the sites of injection surrounding the depot (Inj). Many nuclei were observed around the clusters of particles (arrowhead), they probably belong to the inflammatory cells that infiltrate the injection site. The nanoparticles were rather distributed as large patches (white star) than small patches (white asterisk) at the site of injection. Huge clusters of 1 μm MS (white star) were observed nearby the injection site. The small clusters and 1 μm single particles (arrows) were numerously and were scattered more distant from the injection site. The particles of 10 μm were distributed around the depot as single particle (arrow) or small clusters formed by 2 MS (empty arrow). (PNG 2733 kb)

High resolution image (TIF 1349 kb)

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Pascale, F., Bédouet, L., Fazel, A. et al. Lymphatic Transport and Lymph Node Location of Microspheres Subcutaneously Injected in the Vicinity of Tumors in a Rabbit Model of Breast Cancer. Pharm Res 35, 191 (2018). https://doi.org/10.1007/s11095-018-2474-6

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  • DOI: https://doi.org/10.1007/s11095-018-2474-6

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