Regular ArticleReceptors for Insulin-like Growth Factor-I (IGF-I) Predominate over Insulin Receptors in Skeletal Muscle Throughout the Life Cycle of Brown Trout, Salmo trutta
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Cited by (21)
New insights into the signaling system and function of insulin in fish
2011, General and Comparative EndocrinologyCitation Excerpt :Only at increased levels (1000 nM) of INS administration were 2DG and alanine incorporated into muscle cells above basal levels. However, just as in adipose tissue, skeletal muscle displays an increase abundance of IGF-1 receptors compared to IRs in trout [158,186]. Furthermore, IGF-1 administration caused an increase of [H3] thymidine uptake, and consequently DNA synthesis, whereas INS treatment failed to stimulate [H3] thymidine uptake in rainbow trout muscle cells despite high concentrations [35].
Metabolic and mitogenic effects of IGF-II in rainbow trout (Oncorhynchus mykiss) myocytes in culture and the role of IGF-II in the PI3K/Akt and MAPK signalling pathways
2008, General and Comparative EndocrinologyCitation Excerpt :It is also interesting to point out that IGF-I, and IGF-II, are more potent than insulin in stimulating glucose metabolism. This is consistent with previous results from our laboratory (Castillo et al., 2004) and also with the larger number of receptors for IGF-I than for INS in fish (Mendez et al., 2001b). The predominant role of IGFs was also seen in human myoblasts, in which the concentrations of insulin needed to stimulate glucose uptake (Li and Adrian, 1999) were 10-times higher than those of IGF-I or IGF-II.
Role of insulin, insulin-like growth factors, and muscle regulatory factors in the compensatory growth of the trout (Oncorhynchus mykiss)
2007, General and Comparative EndocrinologyCitation Excerpt :All of these findings indicate that, in terms of IGF-I expression, muscle has a faster response capacity to re-feeding than liver, and that the two IGF isoforms are regulated in distinct manners by nutritional status. High numbers of IGF-1 receptors are present in the skeletal muscle of the brown trout Salmo trutta throughout its life cycle (Méndez et al., 2001a,b); in fact, they were found at higher levels than that of insulin in the same tissue (Párrizas et al., 1995; Gutiérrez et al., 1995; Baños et al., 1998). In agreement with these findings, our results show the abundance of IGF-I receptors, which might make a greater contribution than insulin to the regulation of muscle function, in contrast to the dynamics reported in mammals reviewed by Gutiérrez et al. (2005).
The role of the IGF-I system for vitellogenesis in maturing female sterlet, Acipenser ruthenus Linnaeus, 1758
2007, General and Comparative EndocrinologyCitation Excerpt :Since the insulin receptor is characterised by low IGF-I affinity, IGF-IR is considered the main target for mediating IGF-I effects (Maestro et al., 1997a; Steele-Perkins et al., 1988). Additionally, predominance of IGF-IR over insulin receptors in teleosts has been reported for most tissues (Maestro et al., 1997a; Mendez et al., 2001). Up to now, full-length IGF-IR CDS were only reported for Cyprinus carpio (AY144592, unpublished), Danio rerio (Maures et al., 2002), and Paralichthys olivaceus (Nakao et al., 2002), and partial CDS for Carassius auratus (AF216772, unpublished), Epinephelus coioides (AY772255, unpublished), some salmonids (Greene and Chen, 1999; Tao and Boulding, 2003), and Oreochromis mossambicus (AF463795, unpublished).
Long-term culture of muscle explants from Sparus aurata
2006, Tissue and CellCitation Excerpt :We and others have shown expression of IGF-I and IGF-II in skeletal muscle of fish, including S. aurata larvae and juveniles (Duguay et al., 1994, 1996; Funkenstein et al., 1997; Perrot et al., 1999; Radaelli et al., 2003b). The presence of IGF-I type I receptor (IGF-1R) mRNA and protein in skeletal muscle of several fish species including S. aurata (Perrot et al., 1999; Greene and Chen, 1999; Nakao et al., 2002), and abundant IGF-I binding sites in fish skeletal muscle tissue (Parrizas et al., 1995a,b; Mendez et al., 2001), supports a role for IGF-I (and probably also IGF-II) in fish muscle proliferation and differentiation, although relatively little is known on the role of the IGF-I receptors. A few studies, limited to rainbow trout, showed metabolic and mitogenic effects of IGF-I on cultured muscle cells (Castillo et al., 2004) and glucose uptake upon addition of IGF-II (Codina et al., 2004); however, these presumably proliferating muscle cells were not characterized for their myogenic nature.