V. Podio et al., Biodistribution of stealth and non-stealth solid lipid nanospheres after intravenous administration to rats, J PHARM PHA, 52(9), 2000, pp. 1057-1063
Drug-free stealth and non-stealth solid lipid nanospheres (SLNs) were admin
istered intravenously to rats to evaluate their tissue distribution and the
ir transport across the blood-brain barrier.
Two types of experiments were performed using unlabelled and labelled SLNs.
Rats were administered labelled non-stealth or stealth nanospheres (NSSLNs
and SSLNs) and their tissue distribution was monitored for 60 min. In anot
her experiment, rats were injected with unlabelled NSSLNs or SSLNs and the
cerebrospinal fluid (CSF) was analysed using transmission electron microsco
py (TEM) to confirm the presence of the SLNs.
Some differences were found in the biodistribution between labelled NSSLNs
and SSLNs. In particular, the radioactivity in the liver and the lung was m
uch lower for SSLNs than for NSSLNs, confirming a difference in their uptak
e. Both types of SLNs were detected in the brain. TEM analysis showed both
types of SLNs in rat CSF.