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Göteborgs universitets publikationer

Local overexpression of GH and GH/IGF1 effects in the adult mouse hippocampus.

Författare och institution:
Marion Walser (Institutionen för medicin, avdelningen för invärtesmedicin och klinisk nutrition); Maria Teresa Samà (Institutionen för medicin, avdelningen för invärtesmedicin och klinisk nutrition); Ruth Wickelgren (Institutionen för biomedicin, avdelningen för klinisk kemi och transfusionsmedicin); Maria A I Åberg (Institutionen för neurovetenskap och fysiologi, sektionen för klinisk neurovetenskap och rehabilitering & Institutionen för medicin); Mohammad Bohlooly-Yeganeh (-); Bob Olsson (-); Jan Törnell (-); Jörgen Isgaard (Institutionen för medicin, avdelningen för invärtesmedicin och klinisk nutrition); N David Åberg (Institutionen för neurovetenskap och fysiologi, sektionen för klinisk neurovetenskap och rehabilitering & Institutionen för medicin, avdelningen för invärtesmedicin och klinisk nutrition)
Publicerad i:
The Journal of endocrinology, 215 ( 2 ) s. 257-68
ISSN:
1479-6805
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2012
Språk:
engelska
Fulltextlänk:
Sammanfattning (abstract):
GH therapy improves hippocampal functions mainly via circulating IGF1. However, the roles of local GH and IGF1 expression are not well understood. We investigated whether transgenic (TG) overexpression in the adult brain of bovine GH (bGH) under the control of the glial fibrillary acidic protein (GFAP) promoter affected cellular proliferation and the expression of transcripts known to be induced by systemic GH in the hippocampus. Cellular proliferation was examined by 5-bromo-2'-deoxyuridine immunohistochemistry. Quantitative PCR and western blots were performed. Although robustly expressed, bGH-Tg did not increase either cell proliferation or survival. However, bGH-Tg modestly increased Igf1 and Gfap mRNAs, whereas other GH-associated transcripts were unaffected, i.e. the GH receptor (Ghr), IGF1 receptor (Igf1r), 2',3'-cyclic nucleotide 3'-phosphodiesterase (Cnp), ionotropic glutamate receptor 2a (Nr2a (Grin2a)), opioid receptor delta (Dor), synapse-associated protein 90/postsynaptic density-95-associated protein (Sapap2 (Dlgap2)), haemoglobin beta (Hbb) and glutamine synthetase (Gs (Glul)). However, IGF1R was correlated with the expression of Dor, Nr2a, Sapap2, Gs and Gfap. In summary, although local bGH expression was robust, it activated local IGF1 very modestly, which is probably the reason for the low response of previous GH-associated response parameters. This would, in turn, indicate that hippocampal GH is less important than endocrine GH. However, as most transcripts were correlated with the expression of IGF1R, there is still a possibility for endogenous circulating or local GH to act via IGF1R signalling. Possible reasons for the relative bio-inactivity of bGH include the bell-shaped dose-response curve and cell-specific expression of bGH.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
MEDICIN OCH HÄLSOVETENSKAP ->
Klinisk medicin ->
Endokrinologi och diabetes ->
Endokrinologi
Nyckelord:
Animals, Body Weight, Brain, anatomy & histology, metabolism, Cell Proliferation, Gene Expression Regulation, physiology, Growth Hormone, genetics, metabolism, Hippocampus, metabolism, Insulin-Like Growth Factor I, metabolism, Male, Mice, Mice, Transgenic, Neurons, cytology, metabolism, Organ Size, Receptor, IGF Type 1, genetics, metabolism, Reverse Transcriptase Polymerase Chain Reaction
Postens nummer:
170208
Posten skapad:
2013-01-11 11:52
Posten ändrad:
2016-09-06 08:10

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