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Passive and specific targeting of lymph nodes: influence of the administration route

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Passive and specific targetting of lymph nodes: the role of administration route.

Marion Pitorre,a,b Guillaume Bastiat,*a,b Elodie Marie dit Chatela,b and Jean-Pierre Benoita,b

a LUNAM Université – Micro et Nanomédecines Biomimétiques, F-49933 Angers, France.

b Inserm – U1066 IBS-CHU, 4 rue Larrey, F-49933 Angers Cédex 9, France. Fax: +33 2 44 68 85 46; Tel: +33 2 44 68 85 31;

E-mail: guillaume.bastiat@univ-angers.fr

Introdution

Patients with cancer, diagnosed in advanced stage with the presence of metastases in lymph nodes, present a dismal prognosis. So the targetting of lymph nodes and/or metastases need to be improved in the design of future therapy against cancer. With a lymphogenous metastatic model, the tumor cells (human Ma44-3 cells) implanted in lung were spontaneously disseminated to mediastinum. Using lipid nanocapsules (LNCs) to treat the tumor, an accumulation of nanocarriers in mediastium and associated lymph nodes was observed, after subcutaneous (SC) and/or intravenous (IV) administrations.1 In this study, the correlation between SC sites for LNC administration and specific lymph node accumulation was achieved.

Materials & Methods

LNCs were prepared as previously reported with a size of 30 nm (Z-Average) and with the encapsulation of DiD for fluorescence labeling.1,2 LNC suspensions were IV (tail vein) and SC (behind the neck, left and right flanks, above the tail) administrated to Sprague Dawley rats (9-week females). Blood samples and specific organs (liver, spleen, left and right cervical, brachial, axillary, inguinal lymph nodes) were recovered vs. time (until 28 days) to establish pharmacokinetic and biodistribution profiles using fluorescence techniques (spectroscopy and imaging).

Results & Discussion

Fluorescence–labeling of the nanocarrier was performed with the encapsulation of DiD inside LNCs, as this labeling presents a great stabitity, to follow the in vivo LNC future.3 After SC administrations, no LNC was observed in systemic circulation whatever the injection sites while a typical pharmacokinetic profile was obtained after IV administration.

These results were correlated with the classical high accumulation of LNCs in liver and spleen after IV administration while no LNC was observed in these organs after SC administrations. In addition, after IV administration, a passive targetting was observed in all the studied lymph nodes (left and right cervical, brachial, axillary, inguinal ones). On the other hand, after SC administration, a specific targetting of lymph nodes was observed, depending on the injection sites.

Whatever the SC injection sites, no LNC was accumulated in the cervical lymph nodes (left and right). After SC administration above the tail, LNCs were accumulated in all the others lymph nodes (left and right) while after SC administration behind the neck, only the brachial and axillary (left and right) lymph nodes (and not the inguinal ones) were targetted. After SC administration in the left flank, only the left lymph nodes (brachial, axillary and inguinal ones) were targetted while after SC administration in the right flank, LNCs were accumulated in the right lymph nodes but also the left ones, showing a difference in lymphatic circulation and so LNC distribution in each side of the animal.

Conclusion

Passive but specific targetting of lymph nodes was observed, depending on the administration sites. With an appropriate SC administration, LNCs can be accumulated in specific lymph nodes, while IV administration presented an accumulation of LNCs in overall lymph nodes. A personalized therapeutic scheme for patients could be envisaged when specific lymph node targetting is needed.

References

1 N. Wauthoz, G. Bastiat and E. Moysan, submitted to J. Control. Release.

2 E. Moysan, Y. González-Fernández, N. Lautram, Soft Matter, 2014, 10(11), 1767.

3 G. Bastiat, C.O. Pritz and F. Fouchet, J. Control. Release, 2013, 170(3), 334.

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