201 research outputs found
Melanotrope Secretory Cycle is Regulated by Physiological Inputs via the Hypothalamus
Previously, it has been shown that background color conditions regulate the
overall activity of the frog intermediate lobe by varying the proportions of the
two subtypes of melanotropes existing in the gland, the highly active or
secretory melanotropes and hormone-storage melanotropes, depending on
melanocyte-stimulating hormone ( -MSH) requirements. However, the factors
and mechanisms underlying these background-induced changes are still
unknown. In the present study, we investigated whether hypothalamic factors
known to regulate melanotrope cell function can induce changes in vitro similar
to those caused by background adaptation in vivo. We found that the inhibitors
apomorphine (a dopamine receptor agonist) and NPY decreased the number of
active melanotropes and increased simultaneously that of storage
melanotropes. On the other hand, the stimulator TRH increased the number of
active cells and concomitantly reduced that of storage cells. Inasmuch as none
of these treatments modified the apoptotic and proliferation rates in
melanotrope cells, it appears that these hypothalamic factors caused actual
interconversions of cells from a subpopulation to its counterpart. When taken
together, these findings suggest that the hypothalamus would control
melanotrope activity not only through short-term regulation of hormone
synthesis and release, but also through a long-term regulation of the secretory
phenotype of these cells whereby the activity of the intermediate lobe would be
adjusted to fulfill the hormonal requirements imposed by background
conditions
In1-ghrelin splicing variant is associated with reduced disease-free survival of breast cancer patients and increases malignancy of breast cancer cells lines
OXFORD UNIVERSITY: This is a pre-copyedited, author-produced version of an article accepted for publication in Carcinogenesis following peer review. The version of record David RincĂłn-FernĂĄndez, Michael D Culler, Natia Tsomaia, Gema Moreno-Bueno, RaĂșl M Luque, Manuel D Gahete, Justo P Castaño; In1-ghrelin splicing variant is associated with reduced disease-free survival of breast cancer patients and increases malignancy of breast cancer cells lines, Carcinogenesis, Volume 39, Issue 3, 8 March 2018, Pages 447â457, https://doi.org/10.1093/carcin/bgx146Ghrelin gene generates several variants that regulate multiple pathophysiological functions, including tumor-related processes. In1-ghrelin is a splicing variant that was previously shown to be overexpressed in breast cancer (BCa), where it correlated with proliferation markers; however, its possible association with clinical outcome of BCa patients and underlying mechanisms are still unknown. To address this issue, expression levels and clinical associations of In1-ghrelin were analyzed in a cohort of 117 BCa samples. Additionally, a battery of cellular and molecular assays was implemented using two BCa cell lines (MCF-7 and MDA-MB-231), wherein the role of In1-ghrelin on proliferation, migration, dedifferentiation and signaling pathways was explored. The results generated revealed that high expression of In1-ghrelin in BCa samples was associated with lymph node metastasis and reduced disease-free survival. Indeed, In1-ghrelin overexpression stimulated proliferation and migration in MCF-7 and MDA-MB-231 cells. Similar results were found by treating MDA-MB-231 and MCF-7 with In1- ghrelin-derived peptides. Conversely, In1-ghrelin silencing decreased proliferation and migration capacities of MDA-MB-231. Furthermore, In1-ghrelin (but not ghrelin) overexpression increased the capacity to form mammospheres in both cell lines. These effects could be associated with activation of MAPK-ERK, Jag1/Notch, Wnt/ÎČ-catenin and/or TGF-ÎČ1 pathways. Altogether, our data indicate that In1-ghrelin could play relevant functional roles in the regulation of BCa development and progression and may provide insights to identify novel biomarkers and new therapeutic approaches for this pathology.BIO-0139, CTS-1406, PI-639-2012, PI-0541-2013 (Junta de Andalucia), BFU2013-43282-R, BFU2016-80360-R (MINECO), PI13-00651, PI16/00264 (Proyectos de InvestigaciĂłn en
Salud FIS, funded by Instituto de Salud Carlos III), GETNE Grant 2014, Merck Serono Grant 2013 and CIBERobn (to RML and JPC); PI13/00132, RETICC RD12/0036/0007, CIBERonc and S2010/BMD-2303 (to GMB
The Somatostatin Analogue Octreotide Inhibits Growth of Small Intestine Neuroendocrine Tumour Cells
Octreotide is a widely used synthetic somatostatin analogue that significantly improves the management of
neuroendocrine tumours (NETs). Octreotide acts through somatostatin receptors (SSTRs). However, the molecular
mechanisms leading to successful disease control or symptom management, especially when SSTRs levels are low, are
largely unknown. We provide novel insights into how octreotide controls NET cells. CNDT2.5 cells were treated from 1 day
up to 16 months with octreotide and then were profiled using Affymetrix microarray analysis. Quantitative real-time PCR
and western blot analyses were used to validate microarray profiling in silico data. WST-1 cell proliferation assay was applied
to evaluate cell growth of CNDT2.5 cells in the presence or absence of 1 mM octreotide at different time points. Moreover,
laser capture microdissected tumour cells and paraffin embedded tissue slides from SI-NETs at different stages of disease
were used to identify transcriptional and translational expression. Microarrays analyses did not reveal relevant changes in
SSTR expression levels. Unexpectedly, six novel genes were found to be upregulated by octreotide: annexin A1 (ANXA1), rho
GTPase-activating protein 18 (ARHGAP18), epithelial membrane protein 1 (EMP1), growth/differentiation factor 15 (GDF15),
TGF-beta type II receptor (TGFBR2) and tumour necrosis factor (ligand) superfamily member 15 (TNFSF15). Furthermore,
these novel genes were expressed in tumour tissues at transcript and protein levels. We suggest that octreotide may use a
potential novel framework to exert its beneficial effect as a drug and to convey its action on neuroendocrine cells. Thus, six
novel genes may regulate cell growth and differentiation in normal and tumour neuroendocrine cells and have a role in a
novel octreotide mechanism system
E-cadherin expression is associated with somatostatin analogue response in acromegaly
Acromegaly is a rare disease resulting from hypersecretion of growth hormone (GH)
and insulinâlike growth factor 1 (IGF1) typically caused by pituitary adenomas, which
is associated with increased mortality and morbidity. Somatostatin analogues (SSAs)
represent the primary medical therapy for acromegaly and are currently used as
firstâline treatment or as secondâline therapy after unsuccessful pituitary surgery.
However, a considerable proportion of patients do not adequately respond to SSAs
treatment, and therefore, there is an urgent need to identify biomarkers predictors
of response to SSAs. The aim of this study was to examine Eâcadherin expression
by immunohistochemistry in fiftyâfive GHâproducing pituitary tumours and determine
the potential association with response to SSAs as well as other clinical and
histopathological features. Acromegaly patients with tumours expressing low Eâcadherin
levels exhibit a worse response to SSAs. Eâcadherin levels are associated with
GHâproducing tumour histological subtypes. Our results indicate that the immunohistochemical
detection of Eâcadherin might be useful in categorizing acromegaly
patients based on the response to SSAs.ISCIIIâSubdirecciĂłn General de EvaluaciĂłn y Fomento de la InvestigaciĂłn PI13/02043 PI16/00175FEDER PI13/02043 PI16/00175Junta de AndalucĂa Aâ0023â2015 Aâ0003â2016 CTSâ1406 BIOâ0139Andalusian Ministry of Health Câ0015â2014CIBERobn PI13/ 02043 PI16/0017
Epigenetic and post-transcriptional regulation of somatostatin receptor subtype 5 (SST5) in pituitary and pancreatic neuroendocrine tumors
Somatostatin receptor subtype 5 (SST5) is an emerging biomarker and actionable target in pituitary (PitNETs) and pancreatic (PanNETs) neuroendocrine tumors. Transcriptional and epigenetic regulation of SSTR5 gene expression and mRNA biogenesis is poorly understood. Recently, an overlapping natural antisense transcript, SSTR5-AS1, potentially regulating SSTR5 expression, was identified. We aimed to elucidate whether epigenetic processes contribute to the regulation of SSTR5 expression in PitNETs (somatotropinomas) and PanNETs. We analyzed the SSTR5/SSTR5-AS1 human locus inâsilico to identify CpG islands. SSTR5 and SSTR5-AS1 expression was assessed by quantitative real-time PCR (qPCR) in 27 somatotropinomas, 11 normal pituitaries (NPs), and 15 PanNETs/paired adjacent (control) samples. We evaluated methylation grade in four CpG islands in the SSTR5/SSTR5-AS1 genes. Results revealed that SSTR5 and SSTR5-AS1 were directly correlated in NP, somatotropinoma, and PanNET samples. Interestingly, selected CpG islands were differentially methylated in somatotropinomas compared with NPs. In PanNETs cell lines, SSTR5-AS1 silencing downregulated SSTR5 expression, altered aggressiveness features, and influenced pasireotide response. These results provide evidence that SSTR5 expression in PitNETs and PanNETs can be epigenetically regulated by the SSTR5-AS1 antisense transcript and, indirectly, by DNA methylation, which may thereby impact tumor behavior and treatment response.Junta de AndalucĂaMinisterio de EconomĂaMinisterio de Ciencia e InnovaciĂł
Obesity- and gender-dependent role of endogenous somatostatin and cortistatin in the regulation of endocrine and metabolic homeostasis in mice
Somatostatin (SST) and cortistatin (CORT) regulate numerous endocrine secretions and their absence [knockout (KO)-models] causes important endocrine-metabolic alterations, including pituitary dysregulations. We have demonstrated that the metabolic phenotype of single or combined SST/CORT KO-models is not drastically altered under normal conditions. However, the biological actions of SST/CORT are conditioned by the metabolic-status (e.g. obesity). Therefore, we used male/female SST- and CORT-KO mice fed low-fat (LF) or high-fat (HF) diet to explore the interplay between SST/CORT and obesity in the control of relevant pituitary-axes and whole-body metabolism. Our results showed that the SST/CORT role in the control of GH/prolactin secretions is maintained under LF- and HF-diet conditions as SST-KOs presented higher GH/prolactin-levels, while CORT-KOs displayed higher GH- and lower prolactin-levels than controls under both diets. Moreover, the impact of lack of SST/CORT on the metabolic-function was gender- and diet-dependent. Particularly, SST-KOs were more sensitive to HF-diet, exhibiting altered growth and body-composition (fat/lean percentage) and impaired glucose/insulin-metabolism, especially in males. Conversely, only males CORT-KO under LF-diet conditions exhibited significant alterations, displaying higher glucose-levels and insulin-resistance. Altogether, these data demonstrate a tight interplay between SST/CORT-axis and the metabolic status in the control of endocrine/metabolic functions and unveil a clear dissociation of SST/CORT rolesThis work was supported by the following grants: Junta de AndalucĂa (CTS-1406, BIO-0139), ISCIII-FIS [PI13/00651 and PIE14/00005 (co-funded by European Regional Development Fund/European Social Fund âInvesting in your futureâ)], MINECO (BFU2013â43282-R), âMiguel Servetâ Program, CIBERobn and Ayuda Merck Serono 2013S
A Novel Human Ghrelin Variant (In1-Ghrelin) and Ghrelin-O-Acyltransferase Are Overexpressed in Breast Cancer: Potential Pathophysiological Relevance
The human ghrelin gene, which encodes the ghrelin and obestatin peptides, contains 5 exons (Ex), with Ex1-Ex4 encoding a
117 amino-acid (aa) preproprotein that is known to be processed to yield a 28-aa (ghrelin) and/or a 23-aa (obestatin) mature
peptides, which possess biological activities in multiple tissues. However, the ghrelin gene also encodes additional peptides
through alternative splicing or post-translational modifications. Indeed, we previously identified a spliced mRNA ghrelin
variant in mouse (In2-ghrelin-variant), which is regulated in a tissue-dependent manner by metabolic status and may thus
be of biological relevance. Here, we have characterized a new human ghrelin variant that contains Ex0-1, intron (In) 1, and
Ex2 and lacks Ex3-4. This human In1-ghrelin variant would encode a new prepropeptide that conserves the first 12aa of
native-ghrelin (including the Ser3-potential octanoylation site) but has a different C-terminal tail. Expression of In1-variant
was detected in 22 human tissues and its levels were positively correlated with those of ghrelin-O-acyltransferase (GOAT;
p = 0.0001) but not with native-ghrelin expression, suggesting that In1-ghrelin could be a primary substrate for GOAT in
human tissues. Interestingly, levels of In1-ghrelin variant expression in breast cancer samples were 8-times higher than
those of normal mammary tissue, and showed a strong correlation in breast tumors with GOAT (p = 0.0001), ghrelin
receptor-type 1b (GHSR1b; p = 0.049) and cyclin-D3 (a cell-cycle inducer/proliferation marker; p = 0.009), but not with nativeghrelin
or GHSR1a expression. Interestingly, In1-ghrelin variant overexpression increased basal proliferation of MDA-MB-231
breast cancer cells. Taken together, our results provide evidence that In1-ghrelin is a novel element of the ghrelin family
with a potential pathophysiological role in breast cance
Metabolic Fingerprint of Acromegaly and its Potential Usefulness in Clinical Practice
Insulin-like growth factor-1 (IGF-1) and growth hormone (GH) levels are the main targets for monitoring acromegaly activity, but they are not in close relationship with the clinical course of the disease and the associated comorbidities. The present study was aimed at identifying metabolites that could be used as biomarkers for a better disease phenotyping. For this purpose, metabolic fingerprint using an untargeted metabolomic approach was examined in serum from 30 patients with acromegaly and 30 age-matched controls. Patients with acromegaly presented fewer branched-chain amino acids (BCAAs) compared to the control group (valine: 4.75 ± 0.87 vs. 5.20 ± 1.06 arbitrary units (AUs), p < 0.05; isoleucine: 2.54 ± 0.41 vs. 2.80 ± 0.51 AUs; p < 0.05). BCAAs were also lower in patients with active disease compared to patients with normal levels of IGF-1 with or without medical treatment. GH, but not IGF-1, serum levels were inversely correlated with both valine and isoleucine. These findings indicate that low levels of BCAAs represent the main metabolic fingerprint of acromegaly and that GH, rather than IGF-1, might be the primary mediator. In addition, our results suggest that the assessment of BCAAs could help to identify active disease and to monitor the response to therapeutic strategies
European Neuroendocrine Tumour Society (ENETS) 2023 guidance paper for nonfunctioning pancreatic neuroendocrine tumours.
This ENETS guidance paper for well-differentiated nonfunctioning pancreatic neuroendocrine tumours (NF-Pan-NET) has been developed by a multidisciplinary working group, and provides up-to-date and practical advice on the management of these tumours. Using the extensive experience of centres treating patients with NF-Pan-NEN, the authors of this guidance paper discuss 10 troublesome questions in everyday clinical practice. Our many years of experience in this field are still being verified in the light of the results of new clinical, which set new ways of proceeding in NEN. The treatment of NF-Pan-NEN still requires a decision of a multidisciplinary team of specialists in the field of neuroendocrine neoplasms
Somatostatin Receptor Splicing Variant sst5TMD4 Overexpression in Glioblastoma Is Associated with Poor Survival, Increased Aggressiveness Features and Somatostatin Analogs Resistance
Glioblastoma (GBM) is the most malignant and lethal brain tumor. Current standard treatment consists of surgery followed by radiotherapy/chemotherapy; however, this is only a palliative approach with a mean post-operative survival of scarcely ~12â15 months. Thus, the identification of novel therapeutic targets to treat this devastating pathology is urgently needed. In this context, the truncated splicing variant of the somatostatin receptor subtype 5 (sst5TMD4), which is produced by aberrant alternative splicing, has been demonstrated to be overexpressed and associated with increased aggressiveness features in several tumors. However, the presence, functional role, and associated molecular mechanisms of sst5TMD4 in GBM have not been yet explored. Therefore, we performed a comprehensive analysis to characterize the expression and pathophysiological role of sst5TMD4 in human GBM. sst5TMD4 was significantly overexpressed (at mRNA and protein levels) in human GBM tissue compared to non-tumor (control) brain tissue. Remarkably, sst5TMD4 expression was significantly associated with poor overall survival and recurrent tumors in GBM patients. Moreover, in vitro sst5TMD4 overexpression (by specific plasmid) increased, whereas sst5TMD4 silencing (by specific siRNA) decreased, key malignant features (i.e., proliferation and migration capacity) of GBM cells (U-87 MG/U-118 MG models). Furthermore, sst5TMD4 overexpression in GBM cells altered the activity of multiple key signaling pathways associated with tumor aggressiveness/progression (AKT/JAK-STAT/NF-ÎșB/TGF-ÎČ), and its silencing sensitized GBM cells to the antitumor effect of pasireotide (a somatostatin analog). Altogether, these results demonstrate that sst5TMD4 is overexpressed and associated with enhanced malignancy features in human GBMs and reveal its potential utility as a novel diagnostic/prognostic biomarker and putative therapeutic target in GBMs
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