Effect of GHS-R deletion on growth, pulsatile GH secretion and meal pattern in male and female mice

2021 ◽  
Author(s):  
Alexandra Labarthe ◽  
Philippe Zizzari ◽  
Oriane Fiquet ◽  
Nicolas Lebrun ◽  
Johannes D. Veldhuis ◽  
...  
Keyword(s):  
Linear Growth ◽  
Ex Vivo ◽  
Critical Role ◽  
Metabolic Parameters ◽  
Compensatory Mechanisms ◽  
Male And Female ◽  
Female Mice ◽  
Meal Pattern ◽  
Gh Secretion

Introduction. While the vast majority of research investigating the role of ghrelin or its receptor, GHS-R1a, on growth, feeding and metabolism has been conducted in male rodents, very little is known about sex differences in this system. Furthermore, the role of GHS-R1a signaling in the control of pulsatile GH secretion and its link with growth or metabolic parameters has never been characterized. Methods. We assessed the sex-specific contribution of GHS-R1a signaling on the activity of the GH/IGF-1 axis, metabolic parameters and feeding behavior in adolescent (5-6 weeks old) or adult (10-19 weeks old) GHS-R KO (Ghsr-/-) and WT (Ghsr+/+) male and female mice. Results. Adult Ghsr-/- male and female mice displayed deficits in weight and linear growth that was correlated with reduced GH pituitary contents in males only. GHS-R1a deletion was associated with reduced meal frequency and increased meal intervals, as well as reduced hypothalamic GHRH and NPY mRNA in males, not females. In adult, GH release from Ghsr-/- mice pituitary explants ex vivo was reduced independently of the sex. However, in vivo pulsatile GH secretion decreased in adult but not adolescent Ghsr-/- females, while in males, GHS-R1a deletion was associated with reduction in pulsatile GH secretion during adolescence exclusively. In males, linear growth did not correlate with pulsatile GH secretion, but rather with ApEn, a measure that reflects irregularity of the rhythmic secretion. Fat mass, plasma leptin concentrations or ambulatory activity did not predict differences in GH secretion. Discussion/Conclusion. These results point to a sex-dependent dimorphic effect of GHS-R1a signaling to modulate pulsatile GH secretion and meal pattern in mice with different compensatory mechanisms occuring in the hypothalamus of adult males and females after GHS-R1a deletion. Altogether, we show that GHS-R1a signaling plays a more critical role in the regulation of pulsatile GH secretion during adolescence in males and adulthood in females.

scholarly journals Ghrelin Gene Deletion Alters Pulsatile Growth Hormone Secretion in Adult Female Mice

2021 ◽  
Vol 12 ◽  
Author(s):  
Rim Hassouna ◽  
Gimena Fernandez ◽  
Nicolas Lebrun ◽  
Oriane Fiquet ◽  
Ferdinand Roelfsema ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Food Intake ◽  
Gene Deletion ◽  
Growth Parameters ◽  
Ex Vivo ◽  
Hormone Secretion ◽  
Growth Hormone Secretion ◽  
Metabolic Parameters ◽  
Female Mice ◽  
Gh Secretion

Using preproghrelin-deficient mice (Ghrl-/-), we previously observed that preproghrelin modulates pulsatile growth hormone (GH) secretion in post-pubertal male mice. However, the role of ghrelin and its derived peptides in the regulation of growth parameters or feeding in females is unknown. We measured pulsatile GH secretion, growth, metabolic parameters and feeding behavior in adult Ghrl-/- and Ghrl+/+ male and female mice. We also assessed GH release from pituitary explants and hypothalamic growth hormone-releasing hormone (GHRH) expression and immunoreactivity. Body weight and body fat mass, linear growth, spontaneous food intake and food intake following a 48-h fast, GH pituitary contents and GH release from pituitary explants ex vivo, fasting glucose and glucose tolerance were not different among adult Ghrl-/- and Ghrl+/+ male or female mice. In vivo, pulsatile GH secretion was decreased, while approximate entropy, that quantified orderliness of secretion, was increased in adult Ghrl-/- females only, defining more irregular GH pattern. The number of neurons immunoreactive for GHRH visualized in the hypothalamic arcuate nucleus was increased in adult Ghrl-/- females, as compared to Ghrl+/+ females, whereas the expression of GHRH was not different amongst groups. Thus, these results point to sex-specific effects of preproghrelin gene deletion on pulsatile GH secretion, but not feeding, growth or metabolic parameters, in adult mice.

Role of Mu and Delta Opioid Receptors and their Ligands, Î'-Endorphin and Pre-Pro-Enkephalin, in Stress-Induced Visceral Analgesia in Male and Female Mice

2017 ◽  
Vol 152 (5) ◽  
pp. S212
Author(s):  
Muriel H. Larauche ◽  
Nabila Moussaoui ◽  
Mandy Biraud ◽  
Won Ki Bae ◽  
Wendy Walwyn ◽  
...  
Keyword(s):  
Opioid Receptors ◽  
Male And Female ◽  
Female Mice ◽  
Delta Opioid Receptors

The melanocortin-3 receptor is a pharmacological target for the regulation of anorexia

2021 ◽  
Vol 13 (590) ◽  
pp. eabd6434
Author(s):  
Patrick Sweeney ◽  
Michelle N. Bedenbaugh ◽  
Jose Maldonado ◽  
Pauline Pan ◽  
Katelyn Fowler ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Feeding Behavior ◽  
Critical Role ◽  
Brain Regions ◽  
Sexually Dimorphic ◽  
Male And Female ◽  
Female Mice ◽  
Bidirectional Regulation ◽  
Fear And Anxiety ◽  
Agouti Related Protein

Ablation of hypothalamic AgRP (Agouti-related protein) neurons is known to lead to fatal anorexia, whereas their activation stimulates voracious feeding and suppresses other motivational states including fear and anxiety. Despite the critical role of AgRP neurons in bidirectionally controlling feeding, there are currently no therapeutics available specifically targeting this circuitry. The melanocortin-3 receptor (MC3R) is expressed in multiple brain regions and exhibits sexual dimorphism of expression in some of those regions in both mice and humans. MC3R deletion produced multiple forms of sexually dimorphic anorexia that resembled aspects of human anorexia nervosa. However, there was no sexual dimorphism in the expression of MC3R in AgRP neurons, 97% of which expressed MC3R. Chemogenetic manipulation of arcuate MC3R neurons and pharmacologic manipulation of MC3R each exerted potent bidirectional regulation over feeding behavior in male and female mice, whereas global ablation of MC3R-expressing cells produced fatal anorexia. Pharmacological effects of MC3R compounds on feeding were dependent on intact AgRP circuitry in the mice. Thus, the dominant effect of MC3R appears to be the regulation of the AgRP circuitry in both male and female mice, with sexually dimorphic sites playing specialized and subordinate roles in feeding behavior. Therefore, MC3R is a potential therapeutic target for disorders characterized by anorexia, as well as a potential target for weight loss therapeutics.

Abstract 7: Angiotensin II Type 2 Receptor Deficiency Increases Renal ACE/ACE2 Ratio-Ang II-AT1R Expression In Male but not in Female Mice

Hypertension ◽  
2012 ◽  
Vol 60 (suppl_1) ◽  
Author(s):  
Quaisar Ali ◽  
Yonnie Wu ◽  
Tadashi Inagami ◽  
Tahir Hussain
Keyword(s):  
Blood Pressure ◽  
Renal Function ◽  
Angiotensin Ii ◽  
Renin Activity ◽  
Ang Ii ◽  
Male And Female ◽  
Female Mice ◽  
Gender Specific

Angiotensin II acting via Angiotensin II type 2 receptors (AT2Rs) is believed to be protective against blood pressure increase and affects renal function under pathophysiological condition. Recently we have observed that stimulation of AT2Rs in male obese Zucker rats has shifted the two opposing arms of renin angiotensin system (RAS) i.e. ACE-Ang II-AT1 vs ACE2/Ang-(1-7)-Mas. Evidence suggests that estrogen regulates RAS, including AT2R in female mice. We hypothesized that AT2R has a gender specific regulation of RAS. In the present study, we investigated the role of AT2Rs in regulating RAS components in male and female mice. Kidney cortex from AT2R knockout (AT2RKO) male and female mice and wild type (WT) with similar background (C57BL/6) of 20 weeks of age were used in the study. The cortical ACE expression (ng ACE/μg tissue) was significantly increased in AT2RKO mice (3±0.02) compared to WT males (1.9±0.02). LC/MS analysis of cortical tissue revealed that Ang II was also significantly increased in AT2RKO mice (WT: 31±3, AT2RKO: 47±3 fmoles/mg tissue). Deletion of AT2R significantly increased AT1R (204%, 204 of 100) expression and had no effect on renin activity compared to WT males. The cortical expression of ACE2 activity (WT: 113±8, AT2RKO: 40±11, RFU/min), Ang-(1-7) levels (WT: 7.3±1.4, AT2RKO: 3±0.8 fmoles/mg tissue) and Mas receptor (AT2RKO: 54±15, % of WT) was significantly decreased in AT2RKO males compared to WT. The cortical expression of the AT2R and MasR was 2-fold greater in WT females compared to WT male. The renin activity (WT: 32±2, AT2RKO: 21±0.3, RFU/min) and MasR expression (WT: 187.5±55, AT2KO: 47±9) was significantly decreased in AT2RKO females compared to the female WT. Interestingly, Ang-(1-7) level (WT: 5.7±0.7, AT2RKO 2.6±0.7 fmoles/mg tissue) was decreased but no changes in ACE or ACE2 activity was observed in AT2KO females compared to their WT, suggesting a role of non-ACE2 pathway. This study suggests that AT2R regulates ACE/ACE2 ratio-Ang II-AT1R expression negatively only in males, whereas in females, it regulates Ang-(1-7) potentially via non-ACE2 pathway. Such changes indicate a gender specific mechanisms potentially associated with AT2R-mediated regulation of renal function and blood pressure control.

P6276Impact of the cardiac specific deletion of AMPKalpha2 on the contractile and metabolic phenotype of the heart in male and female mice

2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
L Grimbert ◽  
M N Sanz ◽  
C Rucker-Martin ◽  
M Novotova ◽  
M Gressette ◽  
...  
Keyword(s):  
Contractile Function ◽  
Left Ventricular ◽  
Metabolic Phenotype ◽  
Left Ventricular Ejection ◽  
Ventricular Ejection Fraction ◽  
Male And Female ◽  
Female Mice ◽  
Sex Specificity ◽  
Specific Deletion

Abstract Introduction Mitochondrial dysfunction plays a major role in the Heart Failure (HF) pathophysiology.The AMP activated protein kinase (AMPK) is activated by a high AMP-ADP/ATP ratio and regulates a number of metabolic pathways. Many studies have highlighted a protective role of AMPK in HF, but its relevance to cardiac tissue, its metabolic part and its sex specificity are not well established. Purpose Then, the aim of this study is to determine the role of AMPK in the healthy and failing heart in male and female mice. Methods We developed and validated a mouse strain with an adult-inducible cardiac-specific deletion of AMPKα2, the major cardiac isoform, using the Cre-Lox system (40mg/kg tamoxifen injection on two consecutive days at adult age). At four months after the deletion, cardiac contractility, morphology and metabolism were studied in control and KO mice from both sexes. Results We observed only in male KO mice a decrease of left ventricular ejection fraction (−10%), an increase of the total fibrosis (+64%) and defects in mitochondrial structures. Male KO mice also showed a reduced (−28%) mitochondrial respiration via complex I associated with a different cardiolipin species distribution. Conclusion Our results reveal in adult healthy hearts, a sex-specificity in the effects of AMPKα2 deletion, leading to impaired contractile function related to metabolic and non-metabolic alterations only in male mice.

Development of an ex vivo cellular model of rheumatoid arthritis: Critical role of cd14-positive monocyte/macrophages in the development of pannus tissue

2007 ◽  
Vol 56 (9) ◽  
pp. 2875-2885 ◽  
Author(s):  
Toshiko Nozaki ◽  
Kyoko Takahashi ◽  
Osamu Ishii ◽  
Sachio Endo ◽  
Kyoji Hioki ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Ex Vivo ◽  
Critical Role ◽  
Cellular Model ◽  
Pannus Tissue

scholarly journals Ornithine decarboxylase antizyme in kidneys of male and female mice

1988 ◽  
Vol 254 (2) ◽  
pp. 367-372 ◽  
Author(s):  
Y Murakami ◽  
M Marumo ◽  
S I Hayashi
Keyword(s):  
Ornithine Decarboxylase ◽  
Half Life ◽  
Mouse Kidney ◽  
Repeated Injection ◽  
Male Mice ◽  
Protein Inhibitor ◽  
Male And Female ◽  
Female Mice ◽  
Htc Cells

Antizyme, a protein inhibitor of ornithine decarboxylase (ODC), was shown to be induced in mouse kidney by repeated injection of putrescine. Antizyme was also present as a complex with ODC in the kidney of untreated mouse. The amount of the renal ODC-antizyme complex was 3-fold higher in male mice than in female mice. On the contrary, the proportion of ODC present as a complex with antizyme was 24-fold higher in females than in males, and the decay of renal ODC activity after cycloheximide treatment was about 5-fold more rapid in females than in males. Administration of testosterone to female mice, a procedure known to prolong the half-life of renal ODC, increased both ODC activity and the content of ODC-antizyme complex, but decreased the antizyme/ODC ratio in the kidney. These results are consistent with the previous observation in HTC cells that the decay rate of ODC activity in the presence of cycloheximide correlated well with the proportion of ODC present as a complex with antizyme, suggesting the ubiquitous role of antizyme in ODC degradation.

scholarly journals The Role of Beta-Endorphin in Cocaine-Induced Conditioned Place Preference, Its Extinction, and Reinstatement in Male and Female Mice

2021 ◽  
Vol 15 ◽  
Author(s):  
Prableen K. Singh ◽  
Kabirullah Lutfy
Keyword(s):  
Conditioned Place Preference ◽  
Opioid Peptide ◽  
Place Preference ◽  
Endogenous Opioids ◽  
Priming Dose ◽  
Male And Female ◽  
Female Mice ◽  
Beta Endorphin ◽  
Opposite Chamber

Endogenous opioids have been implicated in cocaine reward. However, the role of each opioid peptide in this regard is unknown. Notably, the role of each peptide in extinction and reinstatement is not fully characterized. Thus, we assessed whether cocaine-induced conditioned place preference (CPP) and its extinction and reinstatement would be altered in the absence of beta-endorphin. We also examined if sex-related differences would exist in these processes. Male and female mice lacking beta-endorphin and their respective controls were tested for baseline place preference on day 1. On day 2, mice were treated with saline/cocaine (15 mg/kg) and confined to the vehicle- or drug-paired chamber for 30 min, respectively. In the afternoon, mice were treated with the alternate treatment and confined to the opposite chamber. Mice were then tested for CPP on day 3. Mice then received additional conditioning on this day as well as on day 4. Mice were then tested for CPP on day 5. Mice then received extinction training on day 9. On day 10, mice were tested for extinction and then reinstatement of CPP following a priming dose of cocaine (7.5 mg/kg). Male and female mice lacking beta-endorphin did not exhibit CPP following single conditioning with cocaine. On the other hand, only male mice lacking beta-endorphin failed to show CPP after repeated conditioning. Nonetheless, reinstatement of CPP was blunted in both male and female mice lacking beta-endorphin compared to controls. The present results suggest that beta-endorphin plays a functional role in cocaine-induced CPP and its reinstatement, and sex-related differences exist in the regulatory action of beta-endorphin on the acquisition but not reinstatement of cocaine CPP.

Pilot Study: The role of chronic stress on brain microvessel density in male and female mice

2020 ◽  
Vol 34 (S1) ◽  
pp. 1-1
Author(s):  
Wendy Jent ◽  
Emily N. Burrage ◽  
Christian Price ◽  
Tyler Colbentz ◽  
Ryan Childers ◽  
...  
Keyword(s):  
Pilot Study ◽  
Chronic Stress ◽  
Microvessel Density ◽  
Male And Female ◽  
Female Mice ◽  
Brain Microvessel
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