Characterization of choroid plexus in the preterm rabbit pup following subcutaneous administration of recombinant human IGF-1/IGFBP-3

Fluids and Barriers of the CNS

Research

Olga Göransson¹  Magdaléna Vaváková¹  Bo Holmqvist²  Norman Barton³  Martin Rydén⁴  Suvi Vallius⁵  Niklas Ortenlöf⁵  Claes Ekström⁶  Magnus Gram⁶  Amanda Kristiansson⁶  Helena Karlsson⁶  David Ley⁶  Galen Carey⁷ 

[1] Department of Experimental Medical Science, Lund University, Lund, Sweden;Imagene-iT AB, Lund, Sweden;Oak Hill Bio, Scientific Advisory Board, Boston, MA, USA;Orthopaedics, Department of Clinical Sciences Lund, Lund University, Lund, Sweden;Pediatrics, Department of Clinical Sciences Lund, Lund University, Lund, Sweden;Pediatrics, Department of Clinical Sciences Lund, Lund University, Skåne University Hospital, Lund, Sweden;Takeda, Cambridge, MA, USA;

关键词: Insulin-like growth factor-1;    Choroid plexus;    Blood-cerebrospinal fluid barrier;    Preterm infant;    Immature brain;    Preterm rabbit pup;    Ventricles;    Cerebrospinal fluid;    Serum;    Insulin-like growth factor-1 receptor;   

DOI  :  10.1186/s12987-023-00460-1

 received in 2023-04-27, accepted in 2023-07-27,  发布年份 2023

来源: Springer

【 摘 要 】

Insulin-like growth factor-1 (IGF-1) is essential for normal brain development and regulates essential processes of vascular maturation and stabilization. Importantly, preterm birth is associated with reduced serum levels of IGF-1 as compared to in utero levels. Using a preterm rabbit pup model, we investigated the uptake of systemic recombinant human (rh) IGF-1 in complex with its main binding protein IGF-binding protein 3 (BP-3) to the brain parenchyma via the choroid plexus. Five hours after subcutaneous administration, labeled rhIGF-1/rhIGFBP-3 displayed a widespread presence in the choroid plexus of the lateral and third ventricle, however, to a less degree in the fourth, as well as in the perivascular and subarachnoid space. We found a time-dependent uptake of IGF-1 in cerebrospinal fluid, decreasing with postnatal age, and a translocation of IGF-1 through the choroid plexus. The impact of systemic rhIGF-1/rhIGFBP-3 on IGF-1 receptor activation in the choroid plexus decreased with postnatal age, correlating with IGF-1 uptake in cerebrospinal fluid. In addition, choroid plexus gene expression was observed to increase with postnatal age. Moreover, using choroid plexus in vitro cell cultures, gene expression and protein synthesis were further investigated upon rhIGF-1/rhIGFBP-3 stimulation as compared to rhIGF-1 alone, and found not to be differently altered. Here, we characterize the uptake of systemic rhIGF-1/rhIGFBP-3 to the preterm brain, and show that the interaction between systemic rhIGF-1/rhIGFBP-3 and choroid plexus varies over time.

【 授权许可】

CC BY   
© BioMed Central Ltd., part of Springer Nature 2023

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