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Multimodal Imaging Study of Gadolinium Presence in Rat Cerebellum: Differences Between Gd Chelates, Presence in the Virchow-Robin Space, Association With Lipofuscin, and Hypotheses About Distribution Pathway.
Rasschaert M
,
Schroeder JA
,
Wu TD
,
Marco S
,
Emerit A
,
Siegmund H
,
Fischer C
,
Fretellier N
,
Idée JM
,
Corot C
,
Brochhausen C
,
Guerquin-Kern JL
.
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PURPOSE: The aim of this study was to investigate, based on in-depth multimodal imaging, the presence of Gd deposits, their ultrastructure, location, and co-location with endogenous elements, in the cerebellum, after repeated administrations of gadolinium-based contrast agents (GBCAs).
METHODS: Rats sensitized by subtotal nephrectomy received 20 daily intravenous injections of 0.6 mmol Gd/kg for 5 weeks of commercial forms of either gadoterate, gadobenate or gadodiamide, or saline (n = 2/group). The study was randomized and blinded. Magnetic resonance imaging examination was performed weekly. One month after the last injection, electron microscopy analysis of the deep cerebellar nuclei, the granular layer of cerebellar cortex, and the choroid plexus was performed. Elemental analysis of deposits was carried out by electron energy loss spectroscopy. Secondary ion mass spectroscopy was used for complementary chemical mapping.
RESULTS: A T1 hypersignal was evidenced in the deep cerebellar nuclei of rats treated with linear GBCAs, and Gd deposits were identified in all the studied cerebellar structures with gadobenate and gadodiamide (except in the granular layer in gadobenate-treated rats). No such effect was found with the macrocyclic GBCA gadoterate. Most of the Gd deposits revealed a characteristic spheroid "sea urchin-like" morphology, rich in phosphorus, and were localized in the basal lamina of microvessels, in the perivascular Virchow-Robin space, and in the interstitium. Gd was also identified in the glial cells, associated with lipofuscin pigments, for these same groups.
CONCLUSIONS: Transmission electron microscopy analysis of cerebellums of renally impaired rats repeatedly injected with gadobenate and gadodiamide revealed the presence of Gd. Spheroid Gd depositions consisting of a filamentous meshwork were observed in the wall of microvessels, in perivascular Virchow-Robin space, and in the interstitium. Gd was also found in choroid plexus and was associated with pigments (likely lipofuscin) in glial cells. This is consistent with the involvement of the glymphatic distribution pathway for GBCAs. No insoluble Gd deposits were detected in rats injected with the macrocyclic GBCA gadoterate and controls.
FIGURE 1. T1-weighted MRI (4.7 T) examination of the animals analyzed by TEM, after an injection-free, washout period of one month, in the plane containing DCN, and associated atlas (copyright Elsevier Inc, with permission).23 A T1 hypersignal was visible in the DCN of rats from the gadobenate (E–F) and gadodiamide groups (G–H) (arrows), but not in the saline (A–B) and gadoterate (C–D) groups.
FIGURE 2. Gd-containing deposits in sea urchin–shaped spheroidal inclusions (asterisks) observed intramembraneously in the basal lamina of vessels in the DCN of rats that received gadobenate (panels C and G) and gadodiamide (panels D and H). In the gadoterate (panels B and F) and saline (panels A and E) groups, the electron-dense structures sporadically observed in the vessel wall never displayed the characteristic sea urchin shape, were not located in the basal lamina, and were always negative for Gd when analyzed by EELS. BL indicates basal lamina; EC, endothelial cell; L, Lumen of the microvessel; P, pericyte.
FIGURE 3. Sea urchin–like, spheroid-shaped Gd deposits (red circles) localized in the basal lamina (1) and in the perivascular (also known as Virchow-Robin) space (2) (DCN of a gadodiamide-treated rat). A indicates Astrocyte end-feet; BL, basal lamina (yellow arrows = BL of glia limitans; orange arrows = unified basal lamina of endothelial cell and pericyte adluminal side; red arrow = basal lamina of one pericyte abluminal side; red stars= BL coalescence of glia limitans and pericyte or of endothelial cell); EC, endothelial cell; L, lumen of vessel; P, pericyte; PVS, perivascular (also known as Virchow-Robin) space.
FIGURE 4. Typical sea urchin–like, spheroid-shaped deposits observed in the interstitium of the DCN of rats treated with gadobenate (A) and gadodiamide (B). In the gadoterate and saline groups, no deposits were found in the interstitium (data not shown).
FIGURE 5. A, Typical sea urchin–like, spheroid-shaped deposits (arrow) in the DCN of a gadodiamide-treated rat. B, Higher magnification of this deposit showed its precise location in the basal lamina confluence of a microvessel, and EELS suggested heterogeneous Gd distribution (as shown in the adjacent spectra). C, 12C14N− (carbon-nitrogen group) image of the analyzed area (delimited by dashes, NanoSIMS chemical mapping), showing high 12C14N− content in the Gd deposit (arrow); D, overlay of P (red, NanoSIMS) and TEM (gray) images, showing that this characteristic Gd deposit was rich in phosphorus (arrow); E, overlay of sulfur (blue, NanoSIMS) and TEM (gray) images showing that this Gd deposit was also rich in sulfur. Ax indicates axon; BL, basal lamina; EC, endothelial cell; L, lumen of the vessel; MS, axon myelin sheaths.
FIGURE 6. Ultrastructure and EELS analysis results of Gd associated with intracellular membrane-bound pigment inclusions, in the DCN of rats that received gadobenate (A and B) and gadodiamide (C and D). Gd was never detected by EELS in pigment inclusions in rats from the gadoterate and saline groups (data not shown). Ax indicates axon; cP, cell protrusion; N, nucleus.
FIGURE 7. Correlative imaging by TEM and NanoSIMS of Gd-positive pigments (areas 1 and 2) examinated by EELS (C1 and C2: higher magnification of areas 1 and 2, respectively), in the DCN of a rat from the gadodiamide group. These pigments were found, by NanoSIMS, to be rich in sulfur (A), consistent with the hypothesis that they are lipofuscin pigments. Presence of P was observed in some parts of the pigments (B1, B2), coinciding with Gd-positive areas observed by EELS (C1, C2, respectively).
FIGURE 8. Examples of Gd-positive inclusions detected in the choroid plexus area. A, Topology of a perivascular fragment of a circulating fibrocyte-like cell bearing a lipofuscin-like pigment inclusion; note its localization in the interstitial space between the blood vessel and the epithelial choroidal cells (gadobenate group). C, Overview displaying pleomorphic non–membrane-bound electron-dense inclusions found in a basal lamina fold of the choroidal epithelium (gadodiamide group). E, Location of a partial spheroid, sea urchin–like structure found in the basal lamina of a pericyte (gadodiamide group). B, D, and F, Higher magnification of the inclusion (in panels A, C, and E, respectively) displaying the areas selected for EELS analysis. Insert in B, electron-dense lipofuscin inclusion with electron spectroscopic imaging–mapped Gd distribution (red). Insert in B, Gd mapping by electron spectroscopic imaging on the membrane-bound lysosomal lipofuscin inclusion (higher magnification). BL indicates basal lamina; CP, choroid plexus epithelial cell; F, circulating fibrocyte-like cell; L, lumen of the venule; 4 V, fourth ventricle.
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