scholarly journals Profiling of Insulin-like Growth Factor Binding Proteins (IGFBPs) in Obesity and Their Association with Ox-LDL and Hs-CRP in Adolescents

2021 ◽  
Author(s):  
Abdur Rahman ◽  
Maha M. Hammad ◽  
Irina Al Khairi ◽  
Preethi Cherian ◽  
Reem Al-Sabah ◽  
...  
Keyword(s):  
Growth Factor ◽  
Weight Status ◽  
Binding Proteins ◽  
Overweight And Obesity ◽  
Insulin Like Growth Factor ◽  
Central Adiposity ◽  
Metabolic Complications ◽  
Factor Binding ◽  
Hs Crp ◽  
Igfbp 3

Insulin-like growth factor binding proteins (IGFBPs) are critical modulators of the metabolism. In adults, IGFBPs are associated with obesity and insulin resistance but the association of IGFBPs with metabolic homeostasis in children and adolescents is not fully characterized. In this study we investigated the association of plasma IGFBPs (IGFBP-1, 3 and 7) with weight status, central adiposity and cardiovascular disease markers Hs-CRP and Ox-LDL. A total of 420 adolescents (age 11-14 years) were randomly recruited from public middle schools in Kuwait. IGFBPs were measured using bead-based multiplexing while Hs-CRP and Ox-LDL were measured using ELISA. IGFBP-1 levels were significantly lower in obese and overweight participants compared to normal weight children. Only IGFBP-1 was negatively associated with waist circumference to height (WC/Ht) ratio. IGFBP-1 was negatively correlated with Hs-CRP while IGFBP-3 and IGFBP-7 were negatively correlated with Ox-LDL. These data demonstrate a robust negative association of IGFBP-1, but not IGFBP-3 or -7, with overweight and obesity, and the inflammation marker Hs-CRP. Central adiposity (WC/Ht ratio) was a stronger predictor of IGFBP-1 than BMI-for-age z-score. IGFBP-1 could thus be used as a sensitive predictive diagnostic tool for obesity and its subsequent effects in screening and monitoring of obesity-related metabolic complications in adolescents.

scholarly journals Profiling of Insulin-Like Growth Factor Binding Proteins (IGFBPs) in Obesity and Their Association With Ox-LDL and Hs-CRP in Adolescents

2021 ◽  
Vol 12 ◽  
Author(s):  
Abdur Rahman ◽  
Maha M. Hammad ◽  
Irina Al Khairi ◽  
Preethi Cherian ◽  
Reem Al-Sabah ◽  
...  
Keyword(s):  
Growth Factor ◽  
Binding Proteins ◽  
Inflammatory Marker ◽  
Negative Association ◽  
Insulin Like Growth Factor ◽  
Central Adiposity ◽  
Metabolic Complications ◽  
Factor Binding ◽  
Hs Crp ◽  
Igfbp 3

Insulin-like growth factor binding proteins (IGFBPs) are critical modulators of metabolism. In adults, IGFBPs are associated with obesity and insulin resistance. However, the association of IGFBPs with metabolic homeostasis in children and adolescents is not yet fully characterized. In this study we investigated the association of plasma IGFBPs (IGFBP-1, 3 and 7) with weight, central adiposity and cardiovascular disease markers Hs-CRP and Ox-LDL. A total of 420 adolescents (age 11-14 years) were recruited from public middle schools in Kuwait. IGFBPs were measured using bead-based multiplexing while Hs-CRP and Ox-LDL were measured using ELISA. Results showed that levels of IGFBP-1 were significantly lower in obese and overweight children when compared to normal weight children. Correlation analysis showed negative association between the level of IGFBP-1 and waist circumference to height (WC/Ht) ratio. IGFBP-1 level was also negatively associated with Hs-CRP. It was also observed that the levels of IGFBP-3 and IGFBP-7 were negatively correlated with Ox-LDL. Our data demonstrate a strong negative association of IGFBP-1 with overweight/obesity, and the inflammatory marker Hs-CRP. This was not seen with the levels of IGFBP-3 and 7. The association of IGFBP-1 with central adiposity (WC/Ht ratio) was stronger than its association with BMI-for-age z-score. Therefore we suggest that IGFBP-1 could potentially be used as a sensitive biomarker for obesity and its subsequent effects in screening and monitoring of obesity-related metabolic complications in adolescents.

Comparison of the effectiveness of various procedures for reducing or eliminating insulin-like growth factor-binding protein interference with insulin-like growth factor-I radioimmunoassays on porcine sera

1994 ◽  
Vol 140 (2) ◽  
pp. 229-237 ◽  
Author(s):  
R S Frey ◽  
M R Hathaway ◽  
W R Dayton
Keyword(s):  
Molecular Weight ◽  
Growth Factor ◽  
Binding Proteins ◽  
Insulin Like Growth Factor ◽  
Factor Binding ◽  
Factor I ◽  
Igf I ◽  
Growth Factor I ◽  
Igfbp 3 ◽  
Glycyl Glycine

Abstract We have examined the efficacy of various methods for reducing the interference of insulin-like growth factor-binding proteins (IGFBPs) with insulin-like growth factor-I (IGF-I) radioimmunoassays (RIAs) run on porcine sera. Acid–ethanol (AE) extraction, AE extraction followed by cryoprecipitation, glycyl–glycine (GG) extraction, GG extraction followed by Sephadex G-50 chromatography in 1 mol acetic acid/l (GG/G-50), and Sep-Pak chromatography were analysed. To provide a range of IGF-I and IGFBP levels, sera obtained from control, hypophysectomized, diabetic and somatotrophin-treated pigs were used. Recoveries of IGF-I added to sera prior to treatments other than Sep-Pak chromatography ranged from 85 to 105% and were not significantly different. In contrast, Sep-Pak chromatography gave extremely variable recoveries. 125I-Labelled IGF-I ligand blotting showed that GG extraction followed by acid G-50 chromatography was by far the most effective method of removing or inactivating IGFBPs in porcine sera. Consequently, this procedure was used as a standard against which to compare other extraction procedures. GG extraction alone removed or inactivated low molecular weight binding proteins but appeared to have little effect on IGFBP-3. AE extraction reduced the level of IGFBP-3 but had little effect on lower molecular weight binding proteins. Even though none of the tested procedures completely removed or inactivated the binding proteins, all samples yielded IGF-I displacement curves that were parallel to that obtained for IGF-I standard. Despite yielding parallel displacement curves, sera extracted by various methods gave dramatically different apparent IGF-I levels when subjected to IGF-I RIA. IGF-I RIA of GG extracted sera yielded IGF-I values that were closest to those obtained for identical serum samples subjected to glycyl-glycine extraction followed by G-50 chromatography. For sera from control, hypophysectomized, diabetic and somatotrophin-treated pigs, the relationship of the IGF-I level in GG-extracted sera to that in GG-extracted, acid G-50 chromatographed (GG/G-50) sera was √GG=1·13√GG/G-50−0·23 (r2=0·98). Consequently, GG extraction can be used to remove IGFBP interference with IGF-I RIAs of porcine sera from normal, hypophysectomized, diabetic and somatotrophin-treated animals. Journal of Endocrinology (1994) 140, 229–237

Responses of insulin-like growth factor binding protein-1 (IGFBP-1) and the IGFBP-3 complex to administration of insulin-like growth factor-I

1993 ◽  
Vol 128 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Robert C Baxter ◽  
Naomi Hizuka ◽  
Kazue Takano ◽  
Sara R Holman ◽  
Kumiko Asakawa
Keyword(s):  
Single Dose ◽  
Growth Factor ◽  
Food Intake ◽  
Binding Proteins ◽  
Insulin Like Growth Factor ◽  
Factor Binding ◽  
Factor I ◽  
Igf I ◽  
Highly Correlated ◽  
Igfbp 3

The importance of insulin-like growth factor binding proteins (IGFBPs) in modulating the bioactivity of administered IGFs is poorly understood. This study examines responses of IGFBP-1 and the IGFBP-3 complex to recombinant human IGF-I. Eight fasted subjects received a single dose of 0.1-0.125 mg/kg IGF-I sc. This caused a 10-fold rise in IGFBP-1 over 6 h. falling rapidly after food intake. Peak (6-h) IGFBP-1 values were highly correlated with peak post-prandial (8-h) glucose values (r = 0.941). IGFBP--3 showed little response, decreasing slightly over the 48-h period following IGF-I. Adaptive changes in IGFBPs were studied in fed adults injected daily for 7 days with IGF-I, 0.1 mg/kg sc. Following the first injection. IGFBP-1 had a markedly blunted response compared to that in fasted subjects. However, after the seventh IGF-I injection, a 3.5-fold greater IGFBP-1 response to the same IGF-I dose was seen. Concomitantly with the increased IGFBP-1 responsiveness, mean immunoreactive IGFBP-3 and acidlabile subunit levels decreased significantly (p< 0.005), whereas IGFBP-2 detected by immunoblotting increased. Thus IGF-I administration causes changes in IGFBPs which may be important in regulating IGF-1 bioavailability.

Circulating insulin-like growth factor II/mannose-6-phosphate receptor and insulin-like growth factor binding proteins in fetal sheep plasma are regulated by glucose and insulin

1994 ◽  
Vol 131 (4) ◽  
pp. 398-404 ◽  
Author(s):  
BW Gallaher ◽  
MH Oliver ◽  
K Eichhorn ◽  
U Kessler ◽  
W Kiess ◽  
...  
Keyword(s):  
Growth Factor ◽  
Binding Proteins ◽  
Glucose Infusion ◽  
Research Centre ◽  
Insulin Like Growth Factor ◽  
Fetal Sheep ◽  
Factor Binding ◽  
Factor Ii ◽  
Mannose 6 Phosphate ◽  
Igfbp 3

Gallaher BW, Oliver MH, Eichhorn K, Kessler U, Kiess W, Harding JE, Gluckman PD, Breier BH. Circulating insulin-like growth factor II/mannose-6-phosphate receptor and insulin-like growth factor binding proteins in fetal sheep plasma are regulated by glucose and insulin. Eur J Endocrinol 1994; 131:398–404. ISSN 0804–4643 We have reported previously that levels of insulin-like growth factor I (IGF-I) and IGF-II in fetal sheep plasma decrease with maternal starvation and increase following an infusion of glucose to the starved fetus, while a fetal infusion of insulin elevates UGF-I alone. We now report the changes in the circulating IGF-II/M6P receptor and plasma IGF binding proteins (IGFBPs), as measured by western blotting and ligand blotting, respectively, in fetus and mother during this study. In fetal plasma, the circulating IGF-II/mannose-6-phosphate (M6P) receptor, IGFBP-3 and IGFBP-4 were reduced during starvation. While circulating IGF-II/M6P receptor and IGFBP-4 levels were increased following the fetal insulin or glucose infusion, IGFBP-3 was unchanged and increased only after 48 h of maternal refeeding. Both IGFBP-1 and IGFBP-2 increased with starvation but while IGFBP-1 levels returned to control values following both insulin and glucose infusion, levels of IGFBP-2 were not reduced significantly by either infusion or by refeeding. In maternal plasma, levels of IGFBP-3 and IGFBP-4 decreased while IGFBP-1 and IGFBP-2 increased after 48 h of starvation. Levels of each IGFBP were unaltered following the fetal infusions but returned to values obtained during the control period after refeeding. These data show that each of the IGF carrier proteins is sensitive of changes in nutrition, either acutely, such as IGFBP-1, or chronically, as for IGFBP-3. This suggests that the circulating IGFII/M6P receptor and the IGFBP's may modulate IGF activity in the fetus during different nutritional states. BH Breier, Research Centre for Developmental Medicine and Biology, Department of Paediatrics, School of Medicine, University of Auckland, Private Bag 92019, Auckland, New Zealand

The proteolysis of insulin-like growth factor binding proteins in ovine uterine luminal fluid

1998 ◽  
Vol 10 (4) ◽  
pp. 309 ◽  
Author(s):  
A. J. Peterson ◽  
A. M. Ledgard ◽  
S. C. Hodgkinson
Keyword(s):  
Growth Factor ◽  
Binding Proteins ◽  
Prolonged Exposure ◽  
Insulin Like Growth Factor ◽  
Factor Binding ◽  
Late Luteal Phase ◽  
Reduced Activity ◽  
Igfbp 3

During days 12–15 after oestrus (day 0), the uterine luminal fluid (ULF) of both pregnant and non-pregnant ewes contains only two prominent insulin-like growth factor binding proteins (IGFBPs) of 16–18 kDa and 22–24 kDa which preferentially bind IGF-2. Immunoblotting with an IGFBP-3 antibody revealed these to be proteolytic fragments of IGFBP-3. In contrast, the ULF from anoestrus and ovariec-tomized ewes contained intact IGFBP-3 (40–44 kDa) and IGFBP-2 (34 kDa). Co-incubation of ULF from an anoestrus ewe with that from a day 12 cycling ewe cleaved the IGFBP-3 present into the two lower molec-ular weight IGFBPs characteristic of ewes in the late luteal phase of the oestrous cycle. The variation in pro-teolytic activity both during the year and during the cycle suggested an influence of progesterone. Supplementation of progesterone to long-term ovariectomized ewes via a CIDR-G™ breeding device for 5, 10 or 15 days induced marked proteolytic activity in all 10-day treated sheep. The ULF from the 15-day treated ewes showed reduced activity and could inhibit the activity present in 10-day ULF, suggesting the induction of an inhibitor after prolonged exposure to progesterone treatment. A possible role of IGFBP-3 proteolysis in the ovine ULF may be to selectively increase the bioavailability of IGF-1 in the uterine microenvironment, which may be crucial for the rapid elongation of trophoblast that begins during days 12–15 after mating.

Expression of insulin-like growth factor binding proteins (IGFBPs) in IGFBP-1 transgenic mice

1997 ◽  
Vol 152 (1) ◽  
pp. 99-108 ◽  
Author(s):  
H Huang ◽  
K Rajkumar ◽  
L J Murphy
Keyword(s):  
Growth Factor ◽  
Binding Proteins ◽  
Phosphoglycerate Kinase ◽  
Mrna Levels ◽  
Insulin Like Growth Factor ◽  
Wild Type ◽  
Northern Blots ◽  
Factor Binding ◽  
Age Related ◽  
Igfbp 3

Abstract The hepatic and renal expressions of the insulin-like growth factor binding proteins (IGFBPs) were examined in transgenic (Tg) mice which overexpress a rat IGFBP-1 transgene driven by the phosphoglycerate kinase-1 promoter. There were no significant differences in the abundance of serum IGFBPs in Tg and wild-type (Wt) mice. Although total hepatic IGFBP-1 mRNA (mouse and transgene-derived) levels were similar in Tg mice to the levels of mouse IGFBP-1 mRNA in Wt mice on day 1 of life, in Tg mice only ∼30% of the IGFBP-1 mRNA was derived from transcription of the mouse gene. An age-related decline in hepatic IGFBP-1 mRNA levels was apparent in both Tg and Wt mice. Food deprivation resulted in increased levels of mouse IGFBP-1 mRNA but the total IGFBP-1 mRNA levels were not significantly different in Tg and Wt mice. In the kidney, unlike the liver, IGFBP-1 mRNA levels in Tg mice were markedly elevated compared with Wt mice and no significant decline was seen with age. Northern blots of hepatic and renal RNA demonstrated similar levels of IGFBP-3, -4, -5 and -6 mRNAs in Tg and Wt mice. From these data we can conclude that in the liver expression of the transgene leads to a coordinated reduction in mouse IGFBP-1 mRNA levels. Journal of Endocrinology (1997) 152, 99–108

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