Cited by 40Adipose Tissue and MetabolismAdipokines, Inflammation, and Metabolic DiseasesGrowth Hormone and Insulin-like Growth Factors

Changes in insulin and IGF-I receptor expression during differentiation of human preadipocytes

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Bäck, Karolina, Arnqvist, Hans J·2009·Growth Hormone & IGF Research

Abstract

Mature adipocytes originate from fibroblast-like precursor cells, preadipocytes, which differentiate to obtain the characteristics of adipocytes. Our aim was to investigate how differentiation of human preadipocytes affects the distribution of insulin receptors (IR) and IGF-I receptors (IGF-IR) and other cell characteristics. Preadipocytes were differentiated using indomethacine, dexamethasone, isobutyl-methylxantine (IBMX) and high concentration of insulin. Gene expression was quantified by real-time RT-PCR in preadipocytes (PA), differentiated preadipocytes (dPA) and mature adipocytes (mAD). The amount of expressed receptor protein was analyzed using receptor specific ELISAs and Western blot. We also studied DNA synthesis with radiolabeled thymidine incorporation and glucose accumulation with radiolabeled glucose. Differentiation of PA increased gene expression of IR but not IGF-IR. GLUT4, growth hormone receptor (GHR) and adiponectin appeared or increased. In PA and dPA only IR-A was expressed whereas also IR-B was detected in mAD. By Western blot and ELISA, IR and IGF-IR were detected in PA, dPA and mAD. During differentiation the ratio of IR to IGF-IR increased severalfold. In PA both the IR and the IGF-IR was phosphorylated by their own ligand at 1 nM and in dPA the activation of both receptors was stimulated by IGF-I, but not insulin, at 1 nM. Accumulation of glucose in PA was increased by insulin at 10nM and by IGF-I at 1 nM and 10nM. DNA synthesis was increased by insulin and IGF-I at 10nM. In conclusion, both IR and IGF-IR are present in human preadipocytes and adipocytes. Differentiation is characterized by an increased IR/IGF-IR ratio.

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Crossref · 10.1016/j.ghir.2008.06.004

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  • Besides lipids themselves, local levels of insulin, glucocorticoids, sex steroids, and bone morphogenetic proteins (BMPs) also directly regulate peroxisome proliferator-activated receptor-γ (PPARγ) and CCAAT/enhancer-binding protein-α (CEBPα), to facilitate preadipocyte differentiation.

    “Besides lipids themselves, local levels of insulin, glucocorticoids, sex steroids, and bone morphogenetic proteins (BMPs) also directly regulate peroxisome proliferator‐activated receptor‐γ (PPARγ) and CCAAT/enhancer‐binding protein‐α (CEBPα), to facilitate preadipocyte differentiation.[ 29 ]”
  • Hyperlipidaemia, hyperinsulinaemia, and other metabolic signalling cues drive the creation and expansion of new lipid storage depots during fat redistribution.

    “Thus, hyperlipidaemia, hyperinsulinaemia, and other metabolic signalling cues drive the creation and expansion of new lipid storage depots during fat redistribution.[ 29 ]”

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Authors
Bäck, K., & Arnqvist, H. J.
Affiliations
Linköping University (SE)
Corresponding author
Bäck, Karolina
Venue
Growth Hormone & IGF Research
Publisher
Elsevier BV
Published
2009-04
Volume
19
Issue
2
Pages
101-111
ISSN
1096-6374 (ISSN-L)
OpenAlex
W2033392856
Cited by
40
References
37
Citations by year
2026: 2 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 1 · 2020: 1 · 2019: 4 · 2017: 1 · 2016: 4 · 2015: 2 · 2013: 4 · 2012: 3
FWCI
2.48
Type
journal article
Language
en
Open access
Locations
  • Growth Hormone & IGF Research (publishedVersion)
  • PubMed (publishedVersion)
  • KTH Publication Database DiVA (KTH Royal Institute of Technology) (submittedVersion, other-oa)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
Keywords
insulin receptor, IGF-1 receptor, preadipocyte differentiation, adipogenesis, insulin-like growth factor I, insulin, GLUT4, growth hormone receptor, adiponectin, receptor phosphorylation, glucose uptake, DNA synthesis, gene expression
MeSH terms
Adult, Aged, Aged, 80 and over, Antigens, Differentiation, Cell Differentiation, Cells, Cultured, Female, Humans, Insulin, Insulin-Like Growth Factor I, Middle Aged, Phosphorylation, Receptor, Insulin, Receptor, IGF Type 1, Adipocytes, Adult Stem Cells

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