1
|
Diao B, Sun C, Yu P, Zhao Z, Yang P. LAMA5 promotes cell proliferation and migration in ovarian cancer by activating Notch signaling pathway. FASEB J 2023; 37:e23109. [PMID: 37527216 DOI: 10.1096/fj.202300306r] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 06/18/2023] [Accepted: 07/12/2023] [Indexed: 08/03/2023]
Abstract
LAMA5 (laminin α5) is a member of the laminin family. Despite the recent research implicating LAMA5 in cancer, the function of LAMA5 has remained uncertain in the progression of ovarian cancer (OC). Here, we investigated the functional influences of LAMA5 knockdown on OC in vitro and in vivo. In this study, we used immunohistochemistry (IHC) analysis to detect the relative expression of LAMA5 in OC and non-cancer tissues, and we analyzed its connection with the overall survival (OS) of OC patients. To prove the role of LAMA5 in cell proliferation, migration, and invasion, LAMA5 expression in OC cell lines was inhibited by lentivirus. Compared with normal fallopian tube tissue, epithelial ovarian cancer (EOC) tissue showed critically higher LAMA5 expression levels; additionally, high LAMA5 levels were a poor predictor of OS. We found that cell progression was restrained in LAMA5-knockdown OC cell lines in vivo and in vitro. Finally, LAMA5 might be a commanding inducer of the expression of epithelial-mesenchymal transition (EMT) and Notch signaling pathway-related markers. Together, our research indicates that LAMA5 is highly connected to OC progression as it may play a role in the EMT process through the Notch signaling pathway.
Collapse
Affiliation(s)
- Bowen Diao
- Department of Gynecology, First Affiliated Hospital, Shihezi University, Shihezi, China
- The NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases, First Affiliated Hospital, Shihezi University, Shihezi, China
| | - Chongfeng Sun
- Department of Gynecology, First Affiliated Hospital, Shihezi University, Shihezi, China
- The NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases, First Affiliated Hospital, Shihezi University, Shihezi, China
| | - Panpan Yu
- Department of Gynecology, First Affiliated Hospital, Shihezi University, Shihezi, China
- The NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases, First Affiliated Hospital, Shihezi University, Shihezi, China
| | - Zouyu Zhao
- Department of Gynecology, First Affiliated Hospital, Shihezi University, Shihezi, China
- The NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases, First Affiliated Hospital, Shihezi University, Shihezi, China
| | - Ping Yang
- Department of Gynecology, First Affiliated Hospital, Shihezi University, Shihezi, China
- The NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases, First Affiliated Hospital, Shihezi University, Shihezi, China
| |
Collapse
|
2
|
Park JU, Kim DK, Kim JY, Jo JH, Kim YM, Jung DH, Kim HJ, Ok SM, Cho HJ, Kim S, Redon CE, Aladjem MI, Jang SM. The differentially expressed gene signatures of the Cullin 3-RING ubiquitin ligases in neuroendocrine cancer. Biochem Biophys Res Commun 2022; 636:71-78. [DOI: 10.1016/j.bbrc.2022.10.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 11/11/2022]
|
3
|
Li H, Wang X, Zhang M, Wang M, Zhang J, Ma S. Identification of HOXA1 as a Novel Biomarker in Prognosis of Head and Neck Squamous Cell Carcinoma. Front Mol Biosci 2021; 7:602068. [PMID: 33763449 PMCID: PMC7982851 DOI: 10.3389/fmolb.2020.602068] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 11/12/2020] [Indexed: 12/24/2022] Open
Abstract
Hox genes, a highly conserved homolog in most animals, play vital functions in cell development and organ formation. In recent years, researchers have discovered that it can act as a tumor regulator, and its members can participate in tumorigenesis by regulating receptor signaling, cell differentiation, apoptosis, migration, EMT, and angiogenesis. Hox genes and which major members play a vital role in the progress of head and neck squamous cell carcinoma (HNSCC) is still unclear. After analyzing the expression differences and prognostic value of all Hox genes through the TCGA-HNSC database, we use histochemistry stains in 52 pairs of HNSCC slices to verify the expression level of the key member-HOXA1. In correlation analysis, we found that high HOXA1 expression is related to poor pathological grade (p = 0.0077), advanced T stage (p = 0.021) and perineural invasion (PNI) (p = 0.0019). Furthermore, we used Cox univariate and multivariate regression analysis to confirm the independent predictive power of HOXA1 expression. To explore the underlying mechanisms behind HOXA1, we ran GSVA and GSEA and found fourteen mutual signaling pathways, including neuroprotein secretion and transport, tumor-associated signaling pathways, cell adhere junction and metabolic reprogramming. Finally, we found that the high expression of HOXA1 is significantly related to the decrease of CD8+ T cell infiltration and the decline of DNA methylation level. Our findings demonstrated that HOXA1, as a notable member of the HOX family, maybe an independent prognostic indicator in HNSCC.
Collapse
Affiliation(s)
- Hui Li
- Department of Otolaryngology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
| | - Xiaomin Wang
- Department of Otolaryngology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
| | - Mingjie Zhang
- Department of Otolaryngology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
| | - Mengjun Wang
- Department of Otolaryngology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
| | - Junjie Zhang
- Department of Otolaryngology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
| | - Shiyin Ma
- Department of Otolaryngology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China
| |
Collapse
|
4
|
Sciammarella C, Luce A, Riccardi F, Mocerino C, Modica R, Berretta M, Misso G, Cossu AM, Colao A, Vitale G, Necas A, Fedacko J, Galdiero M, Correale P, Faggiano A, Caraglia M, Capasso A, Grimaldi A. Lanreotide Induces Cytokine Modulation in Intestinal Neuroendocrine Tumors and Overcomes Resistance to Everolimus. Front Oncol 2020; 10:1047. [PMID: 32766136 PMCID: PMC7379869 DOI: 10.3389/fonc.2020.01047] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Accepted: 05/27/2020] [Indexed: 12/11/2022] Open
Abstract
Somatostatin analogs mantain their major role in the treatment of patients with advanced neuroendocrine tumors (NETs) and have multiple modulatory effects on the immune system. Here, we evaluated the effects of lanreotide treatment on expression of Th1, Th2 cytokine patterns in serum of patients with NETs and in bronchial and pancreatic NET cell lines. Our results showed that lanreotide treatment promoted a Th1 cytotoxic immune-phenotype in patients with NETs originated by intestinal sites. Similar results were obtained also in vitro where lanreotide induced expression of Th1 cytokines only in pancreatic and not in bronchial-derived NET cell lines. It seems, therefore, that cytokinomics can represent a useful tool for the identification of tumor biomarkers for the early diagnosis and evaluation of the response to therapy in NET patients. To avoid the drug-resistance induced by everolimus (mTOR inhibitor), we made the pancreatic NET cell line resistant to this drug. After treatment with lanreotide we found that the drug reduced its viability compared to that of sensitive cells. These data may have direct implications in design of future translation combination trial on NET patients.
Collapse
Affiliation(s)
- Concetta Sciammarella
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.,Department of Clinical Medicine and Surgery, University "Federico II" of Naples, Naples, Italy
| | - Amalia Luce
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
| | | | | | - Roberta Modica
- Department of Clinical Medicine and Surgery, University "Federico II" of Naples, Naples, Italy
| | - Massimiliano Berretta
- Department of Medical Oncology, Centro di Riferimento Oncologico, Istituto Nazionale Tumori CRO, Aviano, Italy
| | - Gabriella Misso
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Alessia Maria Cossu
- Laboratory of Precision and Molecular Oncology, Institute of Genetic Research, Biogem Scarl, Avellino, Italy
| | - Annamaria Colao
- Department of Clinical Medicine and Surgery, University "Federico II" of Naples, Naples, Italy
| | - Giovanni Vitale
- Laboratory of Geriatric and Oncologic Neuroendocrinology Research, Istituto Auxologico Italiano, IRCCS, Milan, Italy.,Department of Clinical Sciences and Community Health (DISCCO), University of Milan, Milan, Italy
| | - Alois Necas
- CEITEC - Central European Institute of Technology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czechia
| | - Jan Fedacko
- 1st Department of Internal Medicine, Centre of Excellency for Atherosclerosis Research, University of Pavol Jozef Safarik, Košice, Slovakia
| | - Marilena Galdiero
- Department of Experimental Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Pierpaolo Correale
- Medical Oncology Unit, "Bianchi-Melacrino-Morelli" Grand Metropolitan Hospital, Reggio Calabria, Italy
| | - Antongiulio Faggiano
- Department of Experimental Medicine, Division of Endocrinology, Sapienza University of Rome, Rome, Italy
| | - Michele Caraglia
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.,Laboratory of Precision and Molecular Oncology, Institute of Genetic Research, Biogem Scarl, Avellino, Italy
| | - Anna Capasso
- Department of Oncology, Livestrong Cancer Institutes, Dell Medical School, The University of Texas, Austin, TX, United States
| | - Anna Grimaldi
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
| |
Collapse
|
5
|
SRC family kinase FYN promotes the neuroendocrine phenotype and visceral metastasis in advanced prostate cancer. Oncotarget 2016; 6:44072-83. [PMID: 26624980 PMCID: PMC4792542 DOI: 10.18632/oncotarget.6398] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Accepted: 11/14/2015] [Indexed: 01/08/2023] Open
Abstract
FYN is a SRC family kinase (SFK) that has been shown to be up-regulated in human prostate cancer (PCa) tissues and cell lines. In this study, we observed that FYN is strongly up-regulated in human neuroendocrine PCa (NEPC) tissues and xenografts, as well as cells derived from a NEPC transgenic mouse model. In silico analysis of FYN expression in prostate cancer cell line databases revealed an association with the expression of neuroendocrine (NE) markers such as CHGA, CD44, CD56, and SYP. The loss of FYN abrogated the invasion of PC3 and ARCaPM cells in response to MET receptor ligand HGF. FYN also contributed to the metastatic potential of NEPC cells in two mouse models of visceral metastasis with two different cell lines (PC3 and TRAMPC2-RANKL). The activation of MET appeared to regulate neuroendocrine (NE) features as evidenced by increased expression of NE markers in PC3 cells with HGF. Importantly, the overexpression of FYN protein in DU145 cells was directly correlated with the increase of CHGA. Thus, our data demonstrated that the neuroendocrine differentiation that occurs in PCa cells is, at least in part, regulated by FYN kinase. Understanding the role of FYN in the regulation of NE markers will provide further support for ongoing clinical trials of SFK and MET inhibitors in castration-resistant PCa patients.
Collapse
|
6
|
Cigrovski Berković M, Čačev T, Catela Ivković T, Marout J, Ulamec M, Zjačić-Rotkvić V, Kapitanović S. High VEGF serum values are associated with locoregional spread of gastroenteropancreatic neuroendocrine tumors (GEP-NETs). Mol Cell Endocrinol 2016; 425:61-8. [PMID: 26805636 DOI: 10.1016/j.mce.2016.01.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 01/13/2016] [Accepted: 01/16/2016] [Indexed: 11/18/2022]
Abstract
Gastroenteropancreatic neuroendocrine tumors (GEP-NETs) are highly vascularized neoplasms, capable of synthethisizing VEGF-A, a key mediator of angiogenesis. In pancreatic neuroendocrine tumors (pNETs) VEGF expression is higher in benign and low-grade tumors and associated with good prognosis (neuroendocrine paradox) while the VEGF role in gastrointestinal NETs (GI-NETs) is still unclear. In this study, we examined the VEGF-1154A/G polymorphism in 145 GEP-NET patients and 150 controls. Next, we measured VEGF serum levels and VEGF tumor protein expression, comparing it with Ki67 and tumor grade. Patients' VEGF serum levels were compared with VEGF -1145A/G genotypes and metastatic status as well as with chromogranin A (CgA) and 5-hydroxyindolacetic acid (5-HIAA) in case of GI-NET patients. In this study GEP-NET patients had elevated VEGF serum values when compared to healthy controls (p = 0.0013). VEGF-1145G allele correlated with higher VEGF serum levels (p = 0.002). Patients with metastatic tumors had higher VEGF serum values when compared to patients without metastases (p = 0.033), and highest levels were observed in case of lymph node metastases (p = 0.008). VEGF-1145G allele was more frequent in non-functional GI-NET patients than in healthy controls (p = 0.041). CgA was superior to VEGF in tumor detection, while VEGF was superior to 5-HIAA. A correlation was observed between VEGF immunohistochemical staining and Ki-67 (p = 0.028). Tumours with weaker VEGF protein expression were more aggressive than tumours with stronger VEGF expression, confirming a "neuroendocrine paradox" in GI-NETs. Our results suggest the role of VEGF in GI-NETs locoregional spread.
Collapse
Affiliation(s)
- Maja Cigrovski Berković
- Department for Endocrinology, Diabetes and Metabolism, University Clinical Hospital Centre "Sestre milosrdnice", Zagreb, Croatia.
| | - Tamara Čačev
- Laboratory for Personalized Medicine, Division of Molecular Medicine, Rudjer Boskovic Institute, Zagreb, Croatia
| | - Tina Catela Ivković
- Laboratory for Personalized Medicine, Division of Molecular Medicine, Rudjer Boskovic Institute, Zagreb, Croatia
| | - Jasminka Marout
- Department for Endocrinology, Diabetes and Metabolism, University Clinical Hospital Centre "Sestre milosrdnice", Zagreb, Croatia
| | - Monika Ulamec
- Department for Clinical Pathology, University Clinical Hospital Centre "Sestre milosrdnice", Zagreb, Croatia
| | - Vanja Zjačić-Rotkvić
- Department for Endocrinology, Diabetes and Metabolism, University Clinical Hospital Centre "Sestre milosrdnice", Zagreb, Croatia
| | - Sanja Kapitanović
- Laboratory for Personalized Medicine, Division of Molecular Medicine, Rudjer Boskovic Institute, Zagreb, Croatia
| |
Collapse
|
7
|
Reuther C, Heinzle V, Spampatti M, Vlotides G, de Toni E, Spöttl G, Maurer J, Nölting S, Göke B, Auernhammer CJ. Cabozantinib and Tivantinib, but Not INC280, Induce Antiproliferative and Antimigratory Effects in Human Neuroendocrine Tumor Cells in vitro: Evidence for 'Off-Target' Effects Not Mediated by c-Met Inhibition. Neuroendocrinology 2016; 103:383-401. [PMID: 26338447 DOI: 10.1159/000439431] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 08/15/2015] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS The hepatocyte growth factor/transmembrane tyrosine kinase receptor c-Met has been defined as a potential target in antitumoral treatment of various carcinomas. We aimed to investigate the direct effect of c-Met inhibition on neuroendocrine tumor cells in vitro. METHODS The effects of the multi-tyrosine kinase inhibitors cabozantinib and tivantinib and of the highly specific c-Met inhibitor INC280 were investigated in human pancreatic neuroendocrine BON1, bronchopulmonary NCI-H727 and midgut GOT1 cells in vitro. RESULTS INC280, cabozantinib and tivantinib inhibited c-Met phosphorylation, respectively. However, while equimolar concentrations (10 μM) of cabozantinib and tivantinib inhibited cell viability and cell migration, INC280 had no inhibitory effect. Knockdown experiments with c-Met siRNA also did not demonstrate effects on cell viability. Cabozantinib and tivantinib caused a G2 arrest in neuroendocrine tumor cells. CONCLUSIONS Our in vitro data suggest that c-Met inhibition alone is not sufficient to exert direct antitumoral or antimigratory effects in neuroendocrine tumor cells. The multi-tyrosine kinase inhibitors cabozantinib and tivantinib show promising antitumoral and antimigratory effects in neuroendocrine tumor cells, which are most probably 'off-target' effects, not mediated by c-Met.
Collapse
Affiliation(s)
- Clemens Reuther
- Department of Internal Medicine II, Campus Grosshadern, University Hospital, Ludwig Maximilian University of Munich, Munich, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Moncayo R. Reflections on the theory of "silver bullet" octreotide tracers: implications for ligand-receptor interactions in the age of peptides, heterodimers, receptor mosaics, truncated receptors, and multifractal analysis. EJNMMI Res 2011; 1:9. [PMID: 22214590 PMCID: PMC3251005 DOI: 10.1186/2191-219x-1-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Accepted: 07/26/2011] [Indexed: 12/25/2022] Open
Abstract
The classical attitude of Nuclear Medicine practitioners on matters of peptide-receptor interactions has maintained an intrinsic monogamic character since many years. New advances in the field of biochemistry and even in clinical Nuclear Medicine have challenged this type of thinking, which prompted me to work on this review. The central issue of this paper will be the use of somatostatin analogs, i.e., octreotide, in clinical imaging procedures as well as in relation to neuroendocirne tumors. Newly described characteristics of G-protein coupled receptors such as the formation of receptor mosaics will be discussed. A small section will enumerate the regulatory processes found in the cell membrane. Possible new interpretations, other than tumor detection, based on imaging procedures with somatostatin analogs will be presented. The readers will be taken to situations such as inflammation, nociception, mechanosensing, chemosensing, fibrosis, taste, and vascularity where somatostatin is involved. Thyroid-associated orbitopathy will be used as a model for the development of multi-agent therapeutics. The final graphical summary depicts the multifactorial properties of ligand binding.
Collapse
Affiliation(s)
- Roy Moncayo
- Department of Nuclear Medicine, Medical University of Innsbruck, Innsbruck, Austria.
| |
Collapse
|
9
|
Loss-of-function mutations in RAB18 cause Warburg micro syndrome. Am J Hum Genet 2011; 88:499-507. [PMID: 21473985 DOI: 10.1016/j.ajhg.2011.03.012] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 03/08/2011] [Accepted: 03/16/2011] [Indexed: 12/24/2022] Open
Abstract
Warburg Micro syndrome and Martsolf syndrome are heterogenous autosomal-recessive developmental disorders characterized by brain, eye, and endocrine abnormalities. Previously, identification of mutations in RAB3GAP1 and RAB3GAP2 in both these syndromes implicated dysregulation of the RAB3 cycle (which controls calcium-mediated exocytosis of neurotransmitters and hormones) in disease pathogenesis. RAB3GAP1 and RAB3GAP2 encode the catalytic and noncatalytic subunits of the hetrodimeric enzyme RAB3GAP (RAB3GTPase-activating protein), a key regulator of the RAB3 cycle. We performed autozygosity mapping in five consanguineous families without RAB3GAP1/2 mutations and identified loss-of-function mutations in RAB18. A c.71T > A (p.Leu24Gln) founder mutation was identified in four Pakistani families, and a homozygous exon 2 deletion (predicted to result in a frameshift) was found in the fifth family. A single family whose members were compound heterozygotes for an anti-termination mutation of the stop codon c.619T > C (p.X207QextX20) and an inframe arginine deletion c.277_279 del (p.Arg93 del) were identified after direct gene sequencing and multiplex ligation-dependent probe amplification (MLPA) of a further 58 families. Nucleotide binding assays for RAB18(Leu24Gln) and RAB18(Arg93del) showed that these mutant proteins were functionally null in that they were unable to bind guanine. The clinical features of Warburg Micro syndrome patients with RAB3GAP1 or RAB3GAP2 mutations and RAB18 mutations are indistinguishable, although the role of RAB18 in trafficking is still emerging, and it has not been linked previously to the RAB3 pathway. Knockdown of rab18 in zebrafish suggests that it might have a conserved developmental role. Our findings imply that RAB18 has a critical role in human brain and eye development and neurodegeneration.
Collapse
|
10
|
Vázquez-Martínez R, Malagón MM. Rab proteins and the secretory pathway: the case of rab18 in neuroendocrine cells. Front Endocrinol (Lausanne) 2011; 2:1. [PMID: 22649356 PMCID: PMC3355916 DOI: 10.3389/fendo.2011.00001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Accepted: 01/03/2011] [Indexed: 11/21/2022] Open
Abstract
The secretory pathway is a process characteristic of cells specialized in secretion such as endocrine cells and neurons. It consists of different stages that are dependent on specific transport of proteins in vesicular-tubular carriers. Biochemical analyses have unveiled a number of protein families that confer identity to carrier vesicles and specificity to their transport. Among them is the family of Rab proteins, Ras-like small GTPases that anchor to the surface of transport vesicles and participate in vesicle formation from the donor compartment, transport along cytoskeletal tracks, and docking and fusion with the acceptor compartment. All of these functions are accomplished through the recruitment of effector proteins, such as sorting adaptors, tethering factors, kinases, phosphatases, and motors. The numerous Rab proteins have distinct subcellular distributions throughout the endomembrane system, which ensures efficient cargo transfer. Rab proteins act as molecular switches that alternate between a cytosolic GDP-bound, inactive form and a membrane-associated GTP-bound, active conformation. Cycling between inactive and active states is a highly regulated process that enables Rabs to confer spatio-temporal precision to the different stages through which a vesicle passes during its lifespan. This review focuses on our current knowledge on Rab functioning, from their structural features to the multiple regulatory proteins and effectors that control Rab activity and translate Rab function. Furthermore, we also summarize the information available on a particular Rab protein, Rab18, which has been linked to the control of secretory granule traffic in neuroendocrine cells.
Collapse
Affiliation(s)
- Rafael Vázquez-Martínez
- Department of Cell Biology, Physiology and Immunology, University of CordobaCordoba, Spain
- Instituto Maimónides de Investigación Biomédica, Biomedical Research Center in Red Physiopathology of Obesity and NutritionCordoba, Spain
| | - Maria M. Malagón
- Department of Cell Biology, Physiology and Immunology, University of CordobaCordoba, Spain
- Instituto Maimónides de Investigación Biomédica, Biomedical Research Center in Red Physiopathology of Obesity and NutritionCordoba, Spain
- *Correspondence: Maria M. Malagón, Department of Cell Biology, Physiology and Immunology, Universidad de Córdoba, Campus de Rabanales, Edificio Severo-Ochoa, Planta 3, E-14014 Córdoba, Spain. e-mail:
| |
Collapse
|
11
|
Sun L, Morris LM, Luo J, Mackey LV, Leslie JS, Franko-Tobin LG, Fuselier JA, LePage KT, Coy DH. Application of human pancreatic carcinoid BON cells for receptor-targeted drug development. J Drug Target 2010; 19:666-74. [PMID: 21083509 DOI: 10.3109/1061186x.2010.531728] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In our previous study, we found that several tumor cell lines displayed high receptor-specific binding affinity, one of which, the human pancreatic carcinoid BON cell line, demonstrates high affinity binding of the bombesin (BN) and somatostatin (SST) receptor-specific ligands. In the present study, BON cells, as a representative model, were further applied to evaluate various peptide analogs and cytotoxic receptor-targeted peptide conjugates. We observed quick ligand-receptor internalization in BON cells as well as high binding affinity. Furthermore, BON cells have high expression of multidrug resistance-associated genes (MDR1) and show camptothecin (CPT) resistance. Various receptor-specific cytotoxic conjugates were synthesized and evaluated in the BON cell model via in vitro and in vivo studies. We found that all the tested conjugates displayed potent antitumor ability in xenografts. Especially, the CPT conjugates, CPT-SST, and CPT-BN, are most likely to increase sensitivity to CPT-resistant BON cells. Our findings suggest that appropriately defined tumor cell lines may provide physiologically relevant cell-based evaluations of novel peptide analogs and receptor-targeted chemotherapeutics.
Collapse
Affiliation(s)
- Lichun Sun
- Department of Medicine, Peptide Research Laboratories, Tulane Health Sciences Center, New Orleans, LA 70112-2699, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Changes in the expression of pituitary adenylate cyclase-activating polypeptide in the human placenta during pregnancy and its effects on the survival of JAR choriocarcinoma cells. J Mol Neurosci 2010; 42:450-8. [PMID: 20449689 DOI: 10.1007/s12031-010-9374-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Accepted: 04/13/2010] [Indexed: 10/19/2022]
Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP), a neuropeptide with survival-promoting actions, has been observed in endocrine organs and is thought to play a role in reproductive functions, including pregnancy. PACAP occurs in two forms, 27 and 38 amino acid residues, with PACAP38 being the predominant form in human tissues. In the present study, we determined the concentrations of PACAP38 and PACAP27 in first-trimester and full-term human placentas using radioimmunoassay. We found high levels of PACAP38 and lower levels of PACAP27 in different parts of the full-term human placenta. PACAP38 content increased in the placenta during pregnancy, both on the maternal side and on the fetal side. The effects of PACAP on the survival of JAR human choriocarcinoma cells were investigated using flow cytometry and MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) cell viability assay in cells exposed to the widely used chemotherapeutic agent methotrexate (MTX). It was found that PACAP neither influenced the survival of JAR cytotrophoblast cells nor affected cellular response to the death-inducing effect of the chemotherapeutic agent MTX. The present observations further support the significance of PACAP in the human placenta. The observation that PACAP did not influence the effects of MTX may have future clinical importance, showing that PACAP does not decrease the effects of certain chemotherapeutic agents.
Collapse
|
13
|
IL-2 -330 T/G SNP and serum values-potential new tumor markers in neuroendocrine tumors of the gastrointestinal tract and pancreas (GEP-NETs). J Mol Med (Berl) 2010; 88:423-9. [PMID: 20049409 DOI: 10.1007/s00109-009-0581-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 11/08/2009] [Accepted: 12/02/2009] [Indexed: 01/27/2023]
Abstract
Cytokines participate in tumorigenesis of gastroenteropancreatic neuroendocrine tumors (GEP-NETs). Single nucleotide polymorphisms (SNPs) in cytokine genes influence expression of proteins and are evaluated in cancer susceptibility. The aim of this study was to evaluate IL-2 -330 T/G SNP and susceptibility to GEP-NETs, and analyze the correlation between G-allele and IL-2 serum values in GEP-NET patients. Moreover we assessed the value of IL-2 as a tumor serum marker. IL-2 -330 T/G SNP was examined in 101 patients and 150 healthy volunteers and IL-2 serum levels in patients and 20 controls. Patients' IL-2 serum levels were compared to IL-2 -330 T/G genotypes and tumor functional status and finally with known markers such as chromogranin A (CgA) and 5-hydroxyindolacetic acid (5-HIAA). There was a significant difference in genotype distribution of the IL-2 -330 polymorphisms between GEP-NET and control group (p = 0.0006) as well as in the frequency of G-allele (p = 0.010). G-allele correlated with higher IL-2 serum levels (p = 0.028) and elevated in all patients, being highest in patients with functional tumors (p = 0.039). Compared to CgA and 5-HIAA, IL-2 was more specific in detecting GEP-NET patients (p < 0.0001 and p < 0.0001, respectively). Our results indicate importance of IL-2 in GEP-NET development and biochemical diagnosis.
Collapse
|
14
|
Germano PM, Lieu SN, Xue J, Cooke HJ, Christofi FL, Lu Y, Pisegna JR. PACAP induces signaling and stimulation of 5-hydroxytryptamine release and growth in neuroendocrine tumor cells. J Mol Neurosci 2009; 39:391-401. [PMID: 19701709 PMCID: PMC6736522 DOI: 10.1007/s12031-009-9283-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Accepted: 07/28/2009] [Indexed: 10/20/2022]
Abstract
Neuroendocrine tumors, although rare, are currently diagnosed with increasing frequency, owing to improved imaging techniques and a greater clinical awareness of this condition. To date, BON is a very well established and characterized human pancreatic neuroendocrine tumor cell line used to study the signal transduction and genetic regulation of neuroendocrine tumors secretion and growth. The secretory activity of BON cells is known to release peptides, such as chromogranin A, neurotensin, and biogenic amines, as 5-HT, permitting an assessment of their biological activity. The neuropeptide pituitary adenylate cyclase activating polypeptide (PACAP), released from the enteric neurons in the gastrointestinal tract by binding to its high affinity receptor PAC1, has been previously shown to regulate the secretory activity and growth of the neuroendocrine-derived enterochromaffin-like cells in the stomach. This led us to speculate that PACAP might also play an important role in regulating the growth of human neuroendocrine tumors. Accordingly, in the current study, we have shown that BON cells express PAC1 receptors, which are rapidly internalized upon PACAP activation. Furthermore, PAC1 receptor activation, in BON cells, couple to intracellular Ca(2+) as well as cAMP responses and induce the release of intracellular 5-HT, activate mitogen activated protein kinases, and stimulate cellular growth. These data indicate that PACAP functionally can stimulate 5-HT release and promote the growth of the BON neuroendocrine tumor cell line. Therefore, PACAP and its receptors regulate neuroendocrine tumor secretory activity and growth in vivo, and this knowledge will permit the development of novel diagnostic and therapeutic targets for managing neuroendocrine tumors in humans.
Collapse
Affiliation(s)
- Patrizia M Germano
- Department of Medicine, University of California, CURE Digestive Diseases Research Center, VA Greater Los Angeles Healthcare System, Los Angeles, CA 90073, USA.
| | | | | | | | | | | | | |
Collapse
|
15
|
Vaudry D, Falluel-Morel A, Bourgault S, Basille M, Burel D, Wurtz O, Fournier A, Chow BKC, Hashimoto H, Galas L, Vaudry H. Pituitary Adenylate Cyclase-Activating Polypeptide and Its Receptors: 20 Years after the Discovery. Pharmacol Rev 2009; 61:283-357. [DOI: 10.1124/pr.109.001370] [Citation(s) in RCA: 829] [Impact Index Per Article: 55.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
|
16
|
Abstract
Neuroendocrine tumours (NETs) comprise a heterogenous group of malignancies with an often unpredictable course, and with limited treatment options. Thus, new diagnostic, prognostic, and therapeutic markers are needed. To shed new lights into the biology of NETs, we have by cDNA transcript profiling, sought to identify genes that are either up- or downregulated in NE as compared with non-NE tumour cells. A panel of six NET and four non-NET cell lines were examined, and out of 12 743 genes examined, we studied in detail the 200 most significantly differentially expressed genes in the comparison. In addition to potential new diagnostic markers (NEFM, CLDN4, PEROX2), the results point to genes that may be involved in the tumorigenesis (BEX1, TMEPAI, FOSL1, RAB32), and in the processes of invasion, progression and metastasis (MME, STAT3, DCBLD2) of NETs. Verification by real time qRT–PCR showed a high degree of consistency to the microarray results. Furthermore, the protein expression of some of the genes were examined. The results of our study has opened a window to new areas of research, by uncovering new candidate genes and proteins to be further investigated in the search for new prognostic, predictive, and therapeutic markers in NETs.
Collapse
|
17
|
Bruland T, Anderssen E, Doseth B, Bergum H, Beisvag V, Laegreid A. Optimization of cDNA microarrays procedures using criteria that do not rely on external standards. BMC Genomics 2007; 8:377. [PMID: 17949480 PMCID: PMC2147032 DOI: 10.1186/1471-2164-8-377] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Accepted: 10/18/2007] [Indexed: 11/18/2022] Open
Abstract
Background The measurement of gene expression using microarray technology is a complicated process in which a large number of factors can be varied. Due to the lack of standard calibration samples such as are used in traditional chemical analysis it may be a problem to evaluate whether changes done to the microarray procedure actually improve the identification of truly differentially expressed genes. The purpose of the present work is to report the optimization of several steps in the microarray process both in laboratory practices and in data processing using criteria that do not rely on external standards. Results We performed a cDNA microarry experiment including RNA from samples with high expected differential gene expression termed "high contrasts" (rat cell lines AR42J and NRK52E) compared to self-self hybridization, and optimized a pipeline to maximize the number of genes found to be differentially expressed in the "high contrasts" RNA samples by estimating the false discovery rate (FDR) using a null distribution obtained from the self-self experiment. The proposed high-contrast versus self-self method (HCSSM) requires only four microarrays per evaluation. The effects of blocking reagent dose, filtering, and background corrections methodologies were investigated. In our experiments a dose of 250 ng LNA (locked nucleic acid) dT blocker, no background correction and weight based filtering gave the largest number of differentially expressed genes. The choice of background correction method had a stronger impact on the estimated number of differentially expressed genes than the choice of filtering method. Cross platform microarray (Illumina) analysis was used to validate that the increase in the number of differentially expressed genes found by HCSSM was real. Conclusion The results show that HCSSM can be a useful and simple approach to optimize microarray procedures without including external standards. Our optimizing method is highly applicable to both long oligo-probe microarrays which have become commonly used for well characterized organisms such as man, mouse and rat, as well as to cDNA microarrays which are still of importance for organisms with incomplete genome sequence information such as many bacteria, plants and fish.
Collapse
Affiliation(s)
- Torunn Bruland
- Department of Cancer Research and Molecular Medicine, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), N-7489 Trondheim, Norway.
| | | | | | | | | | | |
Collapse
|
18
|
Jackson LN, Li J, Chen LA, Townsend CM, Evers BM. Overexpression of wild-type PKD2 leads to increased proliferation and invasion of BON endocrine cells. Biochem Biophys Res Commun 2006; 348:945-9. [PMID: 16899224 PMCID: PMC2430871 DOI: 10.1016/j.bbrc.2006.07.142] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2006] [Accepted: 07/21/2006] [Indexed: 11/25/2022]
Abstract
Carcinoid tumors are rare neuroendocrine tumors with a predilection for the gastrointestinal tract. Protein kinase D (PKD), a novel serine/threonine protein kinase, has been implicated in the regulation of transport processes in certain cell types. We have reported an important role for PKD in stimulated peptide secretion from a human (BON) carcinoid cell line; however, the role of PKD isoforms, including PKD2, in the proliferation and invasion of carcinoid tumors remains unclear. In the present study, we found that overexpression of PKD2 by stable transfection of BON cells with PKD2-wild type (PKD2WT) significantly increased proliferation and invasion compared to cells transfected with PKD2-kinase dead (PKD2KD) or pcDNA3 (control). Similarly, inhibition of PKD2 activity with small interfering RNA (siRNA) significantly decreased proliferation and invasion compared to cells transfected with non-targeting control (NTC) siRNA. These data support an important role for PKD2 in carcinoid tumor progression. Targeted inhibition of the PKD family may prove to be a novel treatment option for patients with carcinoid tumors.
Collapse
Affiliation(s)
- Lindsey N. Jackson
- Department of Surgery, The University of Texas Medical Branch, Galveston, Texas
| | - Jing Li
- Department of Surgery, The University of Texas Medical Branch, Galveston, Texas
- Sealy Center for Cancer Cell Biology, The University of Texas Medical Branch, Galveston, Texas
| | - L. Andy Chen
- Department of Surgery, The University of Texas Medical Branch, Galveston, Texas
| | | | - B. Mark Evers
- Department of Surgery, The University of Texas Medical Branch, Galveston, Texas
- Sealy Center for Cancer Cell Biology, The University of Texas Medical Branch, Galveston, Texas
| |
Collapse
|
19
|
Abstract
The fascinating, but often unpredictable, biology of neuroendocrine tumors (NETs) make the management of these malignancies a real challenge. The more recent development of high-throughput genomic and proteomic techniques, have opened a window to an increased knowledge of the biology of NETs. This review will discuss genes thought to play a role in the context of NE tumor biology, with particularly attention to those that may be potential new diagnostic and prognostic markers, as well as therapeutic targets. NETs constitute a heterogeneous group of neoplasm that may arise in virtually every topographic localization in the body, as a consequence of malignant transformation of various types of NE cells. Since NETs arising in the gastroenteropancreatic (GEP) or bronchopulmonary system are by far the most common, this review focuses on these entities, but lines are drawn to other NETs as well. Although large-scale gene expression analysis undoubtly have raised interesting new hypothesis concerning genes thought to play a role in tumor biology, discrepancies observed between studies and various platforms used, emphasizes the need to not only standardize the way microarray data are reported, but also to introduce standards in sample taking, processing and study design. In addition, the recognition of the complexity of the human proteome, with regard to generation of multiple isoforms from one gene, has created additional challenges. However,some goals have been reached already, as new knowledge has been translated into development of novel promising therapeutics.
Collapse
Affiliation(s)
- Eva Hofsli
- Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim N-7489, Norway.
| |
Collapse
|