scholarly journals Effects of IGF-I on cardiac growth and expression of mRNAs coding for cardiac proteins after induction of heart hypertrophy in the rat

1998 ◽  
pp. 109-117 ◽  
Author(s):  
MY Donath ◽  
W Zierhut ◽  
MA Gosteli-Peter ◽  
C Hauri ◽  
ER Froesch ◽  
...  

Adult rat cardiomyocytes in long-term culture reexpress several fetal cardiac proteins which also reappear during overload heart hypertrophy in vivo. IGF-I decreases reexpression of some of these proteins and stimulates myofibrillogenesis. IGF-I might therefore contribute to enhancing readaptation of the heart to overload. In order to test this hypothesis, hypertension was induced in male Wistar Kyoto rats by constriction of the left renal artery, and an infusion of 500 microg/day of recombinant human IGF-I (rhIGF-I) or vehicle was started after the operation via intraabdominally implanted osmotic minipumps. In the vehicle-treated hypertensive animals body weight gain was reduced after 3, 7 and 14 days, whereas rhIGF-I-treated hypertensive animals continued to gain weight like sham-operated animals. Left ventricular weight and the left, but not the right ventricle/body weight ratio increased more in rhIGF-I- than in vehicle-infused rats. Left ventricular IGF-I mRNA levels remained unchanged after renal clipping in both vehicle- and rhIGF-I-treated rats. However, beta-myosin heavy chain (MHC) mRNA in the left ventricle was 6- to 10-fold increased in clipped controls during the whole postoperative period, and rhIGF-I reduced this increase by more than 50% on days 7 and 14. On the first postoperative day, rhIGF-I prevented the decrease (50%) of alpha-MHC mRNA and the increase (2.5-fold of atrial natriuretic factor mRNA in the left ventricle. Renal clipping did not alter cardiac alpha-actin, but enhanced skeletal alpha-actin mRNA expression in the left ventricle up to 2.5-fold. However, both mRNAs were unaffected by rhIGF-I treatment. Restoration of body weight gain and stimulation of left ventricular cardiac weight by rhIGF-I as well as partial reversion of hypertension-induced changes in cardiac protein expression may reflect beneficial effects contributing to enhance readaptation of the heart to overload.

2006 ◽  
Vol 189 (1) ◽  
pp. 147-154 ◽  
Author(s):  
G Tachas ◽  
S Lofthouse ◽  
C J Wraight ◽  
B F Baker ◽  
N B Sioufi ◽  
...  

Diabetic retinopathy and acromegaly are diseases associated with excess action of GH and its effector IGF-I, and there is a need for improved therapies. We have designed an optimised 2′-O-(2-methoxyethyl)-modified phosphorothioate oligodeoxynucleotide, ATL 227446, and demonstrated its ability to suppress GH receptor mRNA in vitro. Subcutaneous injections of ATL 227446 reduced GH receptor mRNA levels, GH binding activity and serum IGF-I levels in mice after seven days of dosing. The reduction in serum IGF-I could be sustained for over ten weeks of dosing at therapeutically relevant levels, during which there was also a significant decrease in body weight gain in antisense-treated mice relative to saline and mismatch control-treated mice. The findings indicate that administration of an antisense oligonucleotide to the GH receptor may be applicable to human diseases in which suppression of GH action provides therapeutic benefit.


1995 ◽  
Vol 144 (3) ◽  
pp. 449-456 ◽  
Author(s):  
N X Ninh ◽  
J-P Thissen ◽  
D Maiter ◽  
E Adam ◽  
N Mulumba ◽  
...  

Abstract Zinc depletion attenuates growth and decreases circulating IGF-I. To investigate the mechanisms responsible for the IGF-I decline, we determined the effects of dietary zinc (Zn) deficiency on body and organ growth, serum IGF-I, serum GH-binding protein (GHBP), liver GH receptors and liver expression of their corresponding gene. After 1 week of adaptation to a normal zinc diet, a zinc-deficient diet (ZD; Zn, 0 p.p.m.) or a zinc-normal diet (CTR; Zn, 75 p.p.m.) was available ad libitum to 4-week-old Wistar rats for 4 weeks. Pair-fed animals (PF) received the zinc-normal diet in the same absolute amount as that consumed the day before by the ZD group. The food intake of ZD and PF rats was reduced by 32% (P<0·001) compared with the CTR group. Zinc depletion specifically reduced body weight gain (−22%, P<0·05), serum IGF-I concentrations (−52%, P<0·001), hepatic GH receptors (−28%; P<0·05) and serum GHBP levels (−51%; P<0·05), compared with the PF group. GH concentrations were reduced in ZD animals compared with CTR rats (P<0·01). The caloric restriction of PF animals also decreased body weight gain (−50%, P<0·001), serum IGF-I concentrations (−21%, P<0·05), liver GH receptors (−38%, P<0·001) and serum GHBP levels (−38%, P<0·01), when compared with the CTR group. Both ZD and PF groups had reduced liver IGF-I and GH receptor/GHBP mRNA levels in comparison with the CTR group (P<0·01). However, only liver IGF-I mRNA levels were specifically reduced by zinc deficiency (ZD vs PF rats; P<0·05). Our observations suggest that beside the decline of GH secretion, decreased hepatic GH receptors and/or GHBP concentrations might be responsible for the decline of circulating IGF-I in ZD animals. Journal of Endocrinology (1995) 144, 449–456


2003 ◽  
Vol 81 (9) ◽  
pp. 915-919 ◽  
Author(s):  
My-Lan Pham-Dang ◽  
Robert Clement ◽  
Isabelle Mercier ◽  
Angelino Calderone

Hormonal replacement therapy (HRT) has failed to provide a cardioprotective action in postmenopausal women, and thus alternative pharmacological approaches are required. The present study examined the therapeutic potential of the partial estrogen receptor agonist tamoxifen and the angiotensin II type-1 receptor antagonist irbesartan on the hemodynamic profile of ovariectomized (OVX) female Sprague–Dawley rats (9–11 weeks). Three weeks following ovariectomy, uterine atrophy was evident and body weight was increased as compared with sham-operated animals. Left ventricular systolic pressure (LVSP), left ventricular end-diastolic pressure (LVEDP), and mean arterial pressure (MAP) were significantly increased in the OVX rats as compared with sham rats. One week following ovariectomy, rats were treated with either tamoxifen (10 mg kg–1 day–1) or irbesartan (40 mg kg–1 day–1) for a period of 2 weeks. The administration of tamoxifen to OVX rats partially reversed uterine atrophy and prevented body weight gain, albeit body weight remained significantly lower than in sham-operated animals. LVSP and LVEDP were normalized in the tamoxifen-treated OVX rats, whereas MAP remained elevated. Irbesartan partially reduced the body weight gain of the OVX rats and did not influence uterine atrophy. LVSP and MAP were normalized in irbesartan-treated OVX rats, whereas LVEDP remained elevated. These data demonstrate that irbesartan rather than tamoxifen was efficacious in normalizing MAP in the OVX rats without a secondary effect on the uterus.Key words: ovariectomy, hemodynamics, tamoxifen, AT1 receptor antagonists.


2000 ◽  
Vol 165 (3) ◽  
pp. 537-544 ◽  
Author(s):  
I Ibanez De Caceres ◽  
MA Villanua ◽  
L Soto ◽  
AI Martin ◽  
A Lopez-Calderon

Adjuvant-induced arthritis in rats is associated with growth failure, hypermetabolism and accelerated protein breakdown. We have previously reported that adjuvant-induced arthritis in rats results in a decrease in body weight gain, pituitary GH mRNA, circulating GH and IGF-I together with an increase in serum IGF-binding proteins (IGFBPs). The aim of this study was to analyze the role of GH in the decrease in body weight and in the alterations in the IGF-I system observed in chronic inflammation. Male Wistar rats were injected with complete Freund's adjuvant and 16 days later arthritic rats were injected daily with recombinant human GH (rhGH) (3 IU/kg s.c.) for 8 days; control rats received 250 microl saline. Arthritis significantly decreased body weight gain and serum IGF-I. These decreases were not due to the reduced food intake, since in pair-fed rats they were not observed. Furthermore, administration of rhGH to arthritic rats increased body weight gain without modifying food intake. To further investigate the effect of GH administration, 14 days after adjuvant injection both control and arthritic rats were treated with 0, 1.5, 3 or 6 IU/kg of rhGH. GH treatment at the dose of 3 and 6 IU/kg significantly increased body weight gain in arthritic rats. GH administration, at the higher dose of 6 IU/kg, increased hepatic and serum concentrations of IGF-I in both control and arthritic rats. In control rats, rhGH at the three doses assayed increased circulating IGFBP-3. GH treatment in arthritic rats decreased IGFBP-1 and -2, and did not modify IGFBP-4. GH treatment at the dose of 3 IU/kg also decreased circulating IGFBP-3 in arthritic rats. These data suggest that GH treatment can ameliorate the catabolism observed in adjuvant-induced arthritis, an effect mediated, at least in part, by modifications in the circulating IGFBPs.


1989 ◽  
Vol 122 (1) ◽  
pp. 79-86 ◽  
Author(s):  
D. J. Flint ◽  
M. J. Gardner

ABSTRACT Treatment of rats for 24 h on day 2, 10 or 20 of age with a specific antiserum to rGH (anti-(rGH)), GH, bromocriptine (CB-154) or prolactin failed to influence body weight gain or serum concentrations of insulin-like growth factor-I (IGF-I). On day 28 of age, however, anti-(rGH) completely inhibited body weight gain and markedly reduced circulating IGF-I concentrations, effects which were completely prevented by exogenous ovine GH (oGH). When administered to control rats on day 28 oGH caused supranormal weight gain and serum IGF-I concentrations. These results suggested that GH does not play a significant role in growth or regulation of serum IGF-I until after day 20 of age. By contrast, when anti-(rGH) was given for 4 consecutive days beginning on day 2 of life, body weight gain was reduced within 48 h and remained so until at least 28 days of age. Tail length was also significantly reduced. The effect was due to inhibition of GH effects since serum GH concentrations were low and exogenous GH prevented the effect. Inhibition of growth during the first 14 days of life occurred in the absence of any effect on serum IGF-I although by 21 days of age serum IGF-I was considerably lower than in control rats. The prolonged reduction in growth after treatment has stopped appeared to be due to a cytotoxic effect on the pituitary gland since pituitary weight and GH but not prolactin content were significantly decreased. The data are consistent with the hypothesis that in the neonate GH may be processed in serum so that a proportion of it is not recognized by an antiserum to pituitary GH. It would appear that inhibition of GH secretion reduces growth rate by at least 30–40% up to 14 days of age, 50% by 21 days of age and completely by 28 days. Effects of GH on growth could not be fully explained by regulation of serum IGF-I concentrations. Journal of Endocrinology (1989) 122, 79–86


2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Chung Shil Kwak ◽  
Mi-Ju Kim ◽  
Sunyeong Park ◽  
In Gyu Kim

Obesity is closely associated with oxidative stress and chronic inflammation leading to related metabolic diseases. Some natural extracts or polyphenols reportedly possess anti-obesity and anti-inflammatory effects as well as antioxidant activity. In this study, we assessed the correlations between the antioxidant, anti-obesity, and anti-inflammatory activities of plant extracts with potent antioxidant activity in diet-induced obese mice. Sprouts of Cedrela sinensis (CS) and Oenothera biennis L. (OB) were selected as the most potent antioxidant plant based on analysis of in vitro antioxidant activity of the extracts of ten different edible plants. C57BL/6 mice were fed with a high-fat diet (HFD) and orally treated with 50% ethanol extract of CS or OB at 50 or 100 mg/kg body weight 5 days a week for 14 weeks. Body weight gain, weight of adipose tissue, adipocyte size, and levels of lipid metabolism, inflammation, and oxidative stress markers were investigated. The CS or OB extract reduced body weight gain, visceral adipose tissue weight, adipocyte size, and plasma leptin levels, and expressions of adipogenic genes (PPARγ and fatty acid synthase) in the adipose tissue and liver of HFD-fed mice. Both extracts also reduced mRNA levels of pro-inflammatory cytokines (IL-6 and TNF-α) and oxidative stress-related genes (heme oxygenase- (HO-) 1 and p40phox). Body weight gain of mice was significantly correlated with visceral adipose tissue weight and adipocyte size. Body weight gain and adipocyte size were significantly correlated with plasma total cholesterol and 8-epi PGF2α levels, mRNA levels of leptin, HO-1, p40phox, and CD-11 in the adipose tissue, and mRNA levels of TNF-α in the adipose tissue and liver. These results suggest that the CS and OB extracts with potent antioxidant activity may inhibit fat deposition in adipose tissue and subsequent inflammation.


2020 ◽  
Vol 54 (6) ◽  
pp. 1199-1217

Background/Aims: Obesity is a risk factor associated with cardiometabolic complications. Recently, we reported that miRNA-22 deletion attenuated high-fat diet-induced adiposity and prevented dyslipidemia without affecting cardiac hypertrophy in male mice. In this study, we examined the impact of miRNA-22 in obesogenic diet-induced cardiovascular and metabolic disorders in females. Methods: Wild type (WT) and miRNA-22 knockout (miRNA-22 KO) females were fed a control or an obesogenic diet. Body weight gain, adiposity, glucose tolerance, insulin tolerance, and plasma levels of total cholesterol and triglycerides were measured. Cardiac and white adipose tissue remodeling was assessed by histological analyses. Echocardiography was used to evaluate cardiac function and morphology. RNA-sequencing analysis was employed to characterize mRNA expression profiles in female hearts. Results: Loss of miRNA-22 attenuated body weight gain, adiposity, and prevented obesogenic diet-induced insulin resistance and dyslipidemia in females. WT obese females developed cardiac hypertrophy. Interestingly, miRNA-22 KO females displayed cardiac hypertrophy without left ventricular dysfunction and myocardial fibrosis. Both miRNA-22 deletion and obesogenic diet changed mRNA expression profiles in female hearts. Enrichment analysis revealed that genes associated with regulation of the force of heart contraction, protein folding and fatty acid oxidation were enriched in hearts of WT obese females. In addition, genes related to thyroid hormone responses, heart growth and PI3K signaling were enriched in hearts of miRNA-22 KO females. Interestingly, miRNA-22 KO obese females exhibited reduced mRNA levels of Yap1, Egfr and Tgfbr1 compared to their respective controls. Conclusion: This study reveals that miRNA-22 deletion induces cardiac hypertrophy in females without affecting myocardial function. In addition, our findings suggest miRNA-22 as a potential therapeutic target to treat obesity-related metabolic disorders in females.


2007 ◽  
Vol 292 (6) ◽  
pp. E1656-E1665 ◽  
Author(s):  
Miriam Granado ◽  
Ana I Martín ◽  
Mª Ángeles Villanúa ◽  
Asunción López-Calderón

Chronic arthritis induces cachexia associated with an inhibition of the growth hormone (GH)-insulin-like growth factor-I (IGF-I) system and an activation of the E3 ubiquitin-ligating enzymes muscle atrophy F-box (MAFbx) and muscle Ring finger 1 (MuRF1) in the skeletal muscle. The aim of this work was to study the role of cyclooxygenase (COX)-2 in chronic arthritis-induced cachexia. Arthritis was induced in rats by Freund's adjuvant injection, and the effects of two COX inhibitors (indomethacin, a nonspecific inhibitor, and meloxicam, a selective COX-2 inhibitor on pituitary GH and on liver and serum IGF-I levels) were tested. Arthritis decreased body weight gain and GH and liver IGF-I gene expression. In the arthritic rats, both inhibitors, indomethacin and meloxicam, prevented the inhibitory effect of arthritis on body weight gain. Indomethacin and meloxicam administration to arthritic rats increased pituitary GH and liver IGF-I mRNA as well as serum levels of IGF-I. These data suggest that induction of COX-2 during chronic inflammation is involved in the inhibition of the GH-IGF-I axis and in the body weight loss. In the gastrocnemius muscle, arthritis increased the gene expression of tumor necrosis factor (TNF)-α, the E3 ubiquitin-ligating enzymes MAFbx and MuRF1, as well as of IGF-I and IGF-binding protein-5 (IGFBP-5). Inhibition of COX-2 by meloxicam administration increased gastrocnemius weight and decreased MAFbx, MuRF1, TNF-α, and IGFBP-5 gene expression. In summary, our data indicate that chronic arthritis-induced cachexia and muscle wasting are mediated by the COX-2 pathway resulting in a decreased GH-IGF-I secretion and increased expression of MAFbx and MuRF1 mRNA.


Nutrients ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 604 ◽  
Author(s):  
Jung Eun Park ◽  
Suk-Heung Oh ◽  
Youn-Soo Cha

Our previous study reported that lactic acid bacteria (L. brevis OPK-3) isolated from kimchi ameliorated intracellular lipid accumulation in 3T3-L1 adipocyte. The current study explored potential roles of L. brevis OPK-3 (KLAB) on preventing body weight gain and its effect on the inflammatory response of adipose tissue. Male C57BL/6 mice (n = 10) were divided into four groups: normal diet with distilled water (NDC), high-fat diet with distilled water (HDC), high-fat diet with L-ornithine (OTC) or high-fat diet with KLAB. The KLAB supplement resulted in significantly lower body weight, lower epididymal fat tissue mass, and lower serum and hepatic TG levels than the HDC. KLAB supplementation improved serum cytokines, and real-time polymerase chain reaction (PCR) analysis showed significantly lower inflammatory cytokine mRNA levels in epididymal adipose tissue. These results suggest that the administration of KLAB inhibits the induction of inflammation in adipose tissue along with the inhibition of weight gain. Therefore, this study demonstrates the therapeutic and beneficial value of this strain produced during the fermentation of kimchi.


2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Ting Luo ◽  
Tedd Goldfinger ◽  
Neil Shay

ABSTRACT Background Wine aged in oak barrels will incorporate polyphenols inherent in the staves, suggesting that wine stored in these wooden containers will introduce oak compounds into the human body after consumption. Objective The purpose of the present study is to test whether consumption of these oak compounds could favorably influence metabolism in mice fed an obesogenic diet. Methods C57BL/6  male mice (n = 8) were fed diets for 10 wk as follows: low-fat (LF), high-fat (HF), and HF containing 0.17% of oak tannin (HF+OT). A second 10-wk study was completed; mice were provided LF, HF, and HF diets supplemented with 7.0% of concentrates made from oaked wine (HF+OWC) or unoaked wine (HF+UWC). Physiological parameters were measured during the feeding trial and serum markers and hepatic gene expression measured from samples obtained at necropsy. Results Intake of HF+OT significantly reduced body-weight gain (18.4 ± 1.2 g in HF vs. 13.2 ± 1.4 g in HF+OT, P &lt; 0.05). Serum resistin concentrations were lower in HF+OT mice compared with HF mice (301 ± 10.1 pg/mL in HF+OT vs. 374 ± 10.9 pg/mL in HF; P &lt; 0.05). Hepatic lipid accumulation and expression of glutathione-S-transferase-m2 (Gstm2) and NAD(P)H:quinone oxidoreductase (Nqo1) mRNAs were significantly decreased in HF+OT compared with HF mice (P &lt; 0.05). When compared with HF-fed mice, intake of both OWC and UWC decreased body-weight gain (P &lt; 0.05), with no significant impact on food consumption. Fasting glucose concentrations, serum insulin, and hepatic lipid accumulation were reduced in HF+OWC-fed mice compared with HF+UWC-fed mice (P &lt; 0.05). Furthermore, hepatic glutathione-S-transferase-a1 (Gsta1) mRNA levels were significantly reduced in OWC-supplemented (0.25 ± 0.08) compared with UWC-supplemented (1.71 ± 0.24) mice (P &lt; 0.05). Conclusions In this mouse model of metabolic disease, intake of OTs and a concentrate made from an oaked wine had a potent impact on alleviating HF-induced metabolic syndrome. Thus, intake of OTs, provided passively in oaked wine or as a dietary supplement, may act as an agent to attenuate the markers of metabolic syndrome.


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