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Rosa RH, Xie W, Zhao M, Tsai SH, Roddy GW, Su MG, Potts LB, Hein TW, Kuo L. Intravitreal Administration of Stanniocalcin-1 Rescues Photoreceptor Degeneration with Reduced Oxidative Stress and Inflammation in a Porcine Model of Retinitis Pigmentosa. Am J Ophthalmol 2022; 239:230-243. [PMID: 35307380 DOI: 10.1016/j.ajo.2022.03.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 03/09/2022] [Accepted: 03/12/2022] [Indexed: 12/01/2022]
Abstract
PURPOSE To investigate the effect of stanniocalcin-1 (STC-1), a secreted polypeptide exhibiting multiple functions in cell survival and death, on photoreceptor degeneration in a porcine model of retinitis pigmentosa (RP). METHODS P23H transgenic pigs (TG P23H) and wild-type hybrid littermates were obtained from the National Swine Resource and Research Center. Human recombinant STC-1 was injected intravitreally every 2 weeks from postnatal day 15 (P15) to P75. The contralateral eye was injected with balanced salt solution as a control. Electroretinography (ERG) and spectral domain optical coherence tomography (SD-OCT) were performed to evaluate retinal function and morphology in vivo at P90. Retinal tissue was collected for histologic analysis and molecular assays to evaluate the antioxidative and anti-inflammatory mechanisms by which STC-1 may rescue photoreceptor degeneration. RESULTS Intravitreal injection of STC-1 improved retinal function in TG P23H pigs with increased photopic and flicker ERG a- and b-wave amplitudes. Greater integrity of the ellipsoid zone (EZ) band on SD-OCT and morphologic rescue with preservation of cone photoreceptors were observed in STC-1-treated TG P23H pigs. STC-1 altered gene expression in TG P23H pig retina on microarray analysis and increased photoreceptor specific gene expression by reverse transcription-polymerase chain reaction analysis. STC-1 significantly decreased oxidative stress and the expressions of NLRP3 inflammasome, cleaved caspase-1, and IL-1β in TG P23H pig retina. CONCLUSIONS Intravitreal administration of STC-1 enhances cone photoreceptor function, improves EZ integrity, and reduces retinal degeneration through antioxidative and anti-inflammatory effects in a large animal (pig) model of the most common form of autosomal dominant RP in the United States.
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Affiliation(s)
- Robert H Rosa
- Department of Medical Physiology, Texas A&M University Health Science Center, Bryan, TX, USA (RR, WX, MZ, ST, LP, TH, LK); Department of Ophthalmology, Baylor Scott & White Eye Institute, Temple, TX, USA (RR, WX, MZ, MS, LP, TH, LK).
| | - Wankun Xie
- Department of Medical Physiology, Texas A&M University Health Science Center, Bryan, TX, USA (RR, WX, MZ, ST, LP, TH, LK); Department of Ophthalmology, Baylor Scott & White Eye Institute, Temple, TX, USA (RR, WX, MZ, MS, LP, TH, LK)
| | - Min Zhao
- Department of Medical Physiology, Texas A&M University Health Science Center, Bryan, TX, USA (RR, WX, MZ, ST, LP, TH, LK); Department of Ophthalmology, Baylor Scott & White Eye Institute, Temple, TX, USA (RR, WX, MZ, MS, LP, TH, LK)
| | - Shu-Huai Tsai
- Department of Medical Physiology, Texas A&M University Health Science Center, Bryan, TX, USA (RR, WX, MZ, ST, LP, TH, LK)
| | - Gavin W Roddy
- Department of Ophthalmology, Mayo Clinic, Rochester, MN (GR)
| | - Maxwell G Su
- Department of Ophthalmology, Baylor Scott & White Eye Institute, Temple, TX, USA (RR, WX, MZ, MS, LP, TH, LK)
| | - Luke B Potts
- Department of Medical Physiology, Texas A&M University Health Science Center, Bryan, TX, USA (RR, WX, MZ, ST, LP, TH, LK); Department of Ophthalmology, Baylor Scott & White Eye Institute, Temple, TX, USA (RR, WX, MZ, MS, LP, TH, LK)
| | - Travis W Hein
- Department of Medical Physiology, Texas A&M University Health Science Center, Bryan, TX, USA (RR, WX, MZ, ST, LP, TH, LK); Department of Ophthalmology, Baylor Scott & White Eye Institute, Temple, TX, USA (RR, WX, MZ, MS, LP, TH, LK)
| | - Lih Kuo
- Department of Medical Physiology, Texas A&M University Health Science Center, Bryan, TX, USA (RR, WX, MZ, ST, LP, TH, LK); Department of Ophthalmology, Baylor Scott & White Eye Institute, Temple, TX, USA (RR, WX, MZ, MS, LP, TH, LK)
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2
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Zhao M, Xie W, Tsai SH, Hein TW, Rocke BA, Kuo L, Rosa RH. Intravitreal Stanniocalcin-1 Enhances New Blood Vessel Growth in a Rat Model of Laser-Induced Choroidal Neovascularization. Invest Ophthalmol Vis Sci 2018; 59:1125-1133. [PMID: 29490350 PMCID: PMC5830987 DOI: 10.1167/iovs.17-23083] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Purpose The purpose of this study was to investigate the impact of stanniocalcin-1 (STC-1), a photoreceptor-protective glycoprotein, on the development of choroidal neovascularization (CNV) in relation to VEGF and its main receptor (VEGFR2) expression after laser injury. Methods In rats, CNV was induced by laser photocoagulation in both eyes, followed by intravitreal injection of STC-1 in the right eye and vehicle or denatured STC-1 injection in the left eye as control. Two weeks after laser injury, fundus autofluorescence (FAF) imaging and fundus fluorescein angiography (FFA) were performed. Fluorescein leakage from CNV was graded using a defined scale system. The size of CNV was quantified with spectral domain optical coherence tomography (SD-OCT), fluorescein-labeled choroid-sclera flat mounts, and hematoxylin-eosin staining. Protein expressions were evaluated by Western blot. Results Photocoagulation produced a well-circumscribed area of CNV. With STC-1 treatment, CNV lesions assessed by FAF were increased by 50% in both intensity and area. The CNV lesions were also increased with SD-OCT, flat-mount, and histologic analyses. FFA disclosed enhanced fluorescein leakage in CNV lesions in STC-1 treated eyes. The STC-1 protein was detected in the choroidal tissue and its level was increased with CNV lesions in correlation with VEGF and VEGFR2 expressions. Intravitreal administration of STC-1 significantly increased choroidal expression of both VEGF and VEGFR2 proteins. Conclusions Chorodial tissue expresses STC-1, which seemingly acts as a stress response protein by enhancing pathological new blood vessel growth in laser-induced CNV. It is likely that STC-1 promotes CNV development via VEGF signaling.
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Affiliation(s)
- Min Zhao
- Ophthalmic Vascular Research Program, Department of Ophthalmology, Scott & White Eye Institute, Temple, Texas, United States.,Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas, United States
| | - Wankun Xie
- Ophthalmic Vascular Research Program, Department of Ophthalmology, Scott & White Eye Institute, Temple, Texas, United States.,Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas, United States
| | - Shu-Huai Tsai
- Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas, United States
| | - Travis W Hein
- Ophthalmic Vascular Research Program, Department of Ophthalmology, Scott & White Eye Institute, Temple, Texas, United States.,Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas, United States
| | - Brent A Rocke
- Olin E. Teague Veterans' Medical Center, Central Texas Veterans Health Care System, Temple, Texas, United States
| | - Lih Kuo
- Ophthalmic Vascular Research Program, Department of Ophthalmology, Scott & White Eye Institute, Temple, Texas, United States.,Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas, United States
| | - Robert H Rosa
- Ophthalmic Vascular Research Program, Department of Ophthalmology, Scott & White Eye Institute, Temple, Texas, United States.,Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas, United States
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3
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Hayase S, Sasaki Y, Matsubara T, Seo D, Miyakoshi M, Murata T, Ozaki T, Kakudo K, Kumamoto K, Ylaya K, Cheng SY, Thorgeirsson SS, Hewitt SM, Ward JM, Kimura S. Expression of stanniocalcin 1 in thyroid side population cells and thyroid cancer cells. Thyroid 2015; 25:425-36. [PMID: 25647164 PMCID: PMC4390205 DOI: 10.1089/thy.2014.0464] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Mouse thyroid side population (SP) cells consist of a minor population of mouse thyroid cells that may have multipotent thyroid stem cell characteristics. However the nature of thyroid SP cells remains elusive, particularly in relation to thyroid cancer. Stanniocalcin (STC) 1 and 2 are secreted glycoproteins known to regulate serum calcium and phosphate homeostasis. In recent years, the relationship of STC1/2 expression to cancer has been described in various tissues. METHOD Microarray analysis was carried out to determine genes up- and down-regulated in thyroid SP cells as compared with non-SP cells. Among genes up-regulated, stanniocalcin 1 (STC1) was chosen for study because of its expression in various thyroid cells by Western blotting and immunohistochemistry. RESULTS Gene expression analysis revealed that genes known to be highly expressed in cancer cells and/or involved in cancer invasion/metastasis were markedly up-regulated in SP cells from both intact as well as partial thyroidectomized thyroids. Among these genes, expression of STC1 was found in five human thyroid carcinoma-derived cell lines as revealed by analysis of mRNA and protein, and its expression was inversely correlated with the differentiation status of the cells. Immunohistochemical analysis demonstrated higher expression of STC1 in the thyroid tumor cell line and thyroid tumor tissues from humans and mice. CONCLUSION These results suggest that SP cells contain a population of cells that express genes also highly expressed in cancer cells including Stc1, which warrants further study on the role of SP cells and/or STC1 expression in thyroid cancer.
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Affiliation(s)
- Suguru Hayase
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
- Department of Organ Regulatory Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Yoshihito Sasaki
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
- Kuwana East Medical Center, Kuwana, Mie, Japan
| | - Tsutomu Matsubara
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
- Department of Anatomy and Regenerative Biology, Graduate School of Medicine, Osaka City University, Osaka, Japan
| | - Daekwan Seo
- Laboratory of Experimental Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
- Bioinformatics Core, School of Biological Sciences, Seoul National University, Seoul, South Korea
| | - Masaaki Miyakoshi
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
- Department of Oral Pathobiological Science, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - Tsubasa Murata
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
- Dental and Oral Surgery, Tomakomai City Hospital, Tomakomai, Hokkaido, Japan
| | - Takashi Ozaki
- Department of Pathology, Wakayama Medical University, Wakayama City, Japan
| | - Kennichi Kakudo
- Department of Pathology, Nara Hospital Kinki University Faculty of Medicine, Ikoma, Japan
| | - Kensuke Kumamoto
- Department of Organ Regulatory Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Kris Ylaya
- Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Sheue-yann Cheng
- Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Snorri S. Thorgeirsson
- Laboratory of Experimental Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Stephen M. Hewitt
- Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | | | - Shioko Kimura
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
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Stanniocalcin1 (STC1) Inhibits Cell Proliferation and Invasion of Cervical Cancer Cells. PLoS One 2013; 8:e53989. [PMID: 23382863 PMCID: PMC3558422 DOI: 10.1371/journal.pone.0053989] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 12/05/2012] [Indexed: 12/05/2022] Open
Abstract
STC1 is a glycoprotein hormone involved in calcium/phosphate (Pi) homeostasis. There is mounting evidence that STC1 is tightly associated with the development of cancer. But the function of STC1 in cancer is not fully understood. Here, we found that STC1 is down-regulated in Clinical tissues of cervical cancer compared to the adjacent normal cervical tissues (15 cases). Subsequently, the expression of STC1 was knocked down by RNA interference in cervical cancer CaSki cells and the low expression promoted cell growth, migration and invasion. We also found that STC1 overexpression inhibited cell proliferation and invasion of cervical cancer cells. Moreover, STC1 overexpression sensitized CaSki cells to drugs. Further, we showed that NF-κB p65 protein directly bound to STC1 promoter and activated the expression of STC1 in cervical cancer cells. Thus, these results provided evidence that STC1 inhibited cell proliferation and invasion through NF-κB p65 activation in cervical cancer.
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Richards TDJ, Fenton AL, Syed R, Wagner GF. Characterization of stanniocalcin-1 receptors in the rainbow trout. ISRN ENDOCRINOLOGY 2012; 2012:257841. [PMID: 22474594 PMCID: PMC3302014 DOI: 10.5402/2012/257841] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Accepted: 09/20/2011] [Indexed: 01/08/2023]
Abstract
Mammalian stanniocalcin-1 (STC-1) is one of several ligands targeted to mitochondria. High affinity STC-1 receptors are present on the mitochondrial membranes of nephron cells, myocytes, and hepatocytes, to enable ligand sequestration within the matrix. However, STC-1 receptors have not been characterized in fish. Nor is it known if mitochondrial targeting occurs in fish. The aim of the study was to address these questions. Saturation binding assays were carried out to obtain estimates of KD
and
Bmax. They revealed the presence of saturable, high-affinity receptors on both membranes and mitochondria of liver, muscle, and gill filament. In situ ligand binding (ISLB) was used to localize receptors at the histological level and revealed some unexpected findings. In cranium, for instance, receptors were found mainly in the cartilage matrix, as opposed to the chondrocytes. In brain, the majority of receptors were located on neuropil areas as opposed to neuronal cell bodies. In skeletal muscle, receptors were confined to periodic striations, tentatively identified as the Z lines. Receptors were even found on STC-1 producing corpuscles of Stannius cells, raising the possibility of there being an autocrine feedback loop or, perhaps, a soluble binding protein that is released with the ligand to regulate its bioavailability.
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Affiliation(s)
- Timothy D J Richards
- Department of Physiology and Pharmacology, Faculty of Medicine and Dentistry, University of Western Ontario, London, ON, Canada N6A 5C1
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6
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Hung NT, Yamamoto H, Takei Y, Masuda M, Otani A, Kozai M, Ikeda S, Nakahashi O, Tanaka S, Taketani Y, Takeda E. Up-regulation of stanniocalcin 1 expression by 1,25-dihydroxy vitamin D(3) and parathyroid hormone in renal proximal tubular cells. J Clin Biochem Nutr 2011; 50:227-33. [PMID: 22573926 PMCID: PMC3334377 DOI: 10.3164/jcbn.11-99] [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] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 08/05/2011] [Indexed: 11/22/2022] Open
Abstract
Stanniocalcin 1 and stanniocalcin 2 are two glycoprotein hormones, which act as calcium phosphate-regulating factor on intestine and kidney. We have previously reported that stanniocalcin 2 expression is positively and negatively controlled by 1,25(OH)2D3 and parathyroid hormone in renal proximal tubular cells. However, it has been unclear whether they regulate the stanniocalcin 1 gene expression. In this study, we identified the opossum stanniocalcin 1 cDNA sequence. The opossum stanniocalcin 1 amino acid sequence had 83% homology with human stanniocalcin 1, and has a conserved putative N-linked glycosylation site. Real-time PCR analysis using opossum kidney proximal tubular (OK-P) cells revealed that the mRNA levels of stanniocalcin 1 gene is up-regulated by both 1,25(OH)2D3 and parathyroid hormone in dose-dependent and time-dependent manners. We also demonstrated that the stanniocalcin 1 expression was increased in parathyroid hormone injected rat kidney. Furthermore, the mRNA expression of stanniocalcin 1 and stanniocalcin 2 were oppositely regulated by phorbol 12,13-myristic acetate, a specific PKC activator. Interestingly, the up-regulation of stanniocalcin 1 gene by 1,25(OH)2D3 and phorbol 12,13-myristic acetate were not prevented in the presence of actinomycin D, an RNA synthesis inhibitor. These results suggest that the stanniocalcin 1 gene expression is up-regulated by 1,25(OH)2D3 and parathyroid hormone through mRNA stabilization in renal proximal tubular cells.
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Affiliation(s)
- Nguyen Trong Hung
- Department of Clinical Nutrition, Institute of Health Biosciences, University of Tokushima Graduate School, Kuramoto-Cho 3-18-15, Tokushima 770-8503, Japan
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7
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He LF, Wang TT, Gao QY, Zhao GF, Huang YH, Yu LK, Hou YY. Stanniocalcin-1 promotes tumor angiogenesis through up-regulation of VEGF in gastric cancer cells. J Biomed Sci 2011; 18:39. [PMID: 21672207 PMCID: PMC3142497 DOI: 10.1186/1423-0127-18-39] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Accepted: 06/14/2011] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Stanniocalcin-1(STC-1) is up-regulated in several cancers including gastric cancer. Evidences suggest that STC-1 is associated with carcinogenesis and angiogenic process. However, it is unclear on the exact role for STC-1 in inducing angiogenesis and tumorigeneisis. METHOD BGC/STC cells (high-expression of STC-1) and BGC/shSTC cells (low- expression of STC-1) were constructed to investigate the effect of STC-1 on the xenograft tumor growth and angiogenesis in vitro and in vivo. ELISA assay was used to detect the expression of vascular endothelial growth factor (VEGF) in the supernatants. Neutralizing antibody was used to inhibit VEGF expression in supernatants. The expression of phosphorylated -PKCβII, phosphorylated -ERK1/2 and phosphorylated -P38 in the BGC treated with STC-1protein was detected by western blot. RESULTS STC-1 could promote angiogenesis in vitro and in vivo, and the angiogenesis was consistent with VEGF expression in vitro. Inhibition of VEGF expression in supernatants with neutralizing antibody markedly abolished angiogenesis induced by STC-1 in vitro. The process of STC-1-regulated VEGF expression was mediated via PKCβII and ERK1/2. CONCLUSIONS STC-1 promotes the expression of VEGF depended on the activation of PKCβII and ERK1/2 pathways. VEGF subsequently enhances tumor angiogenesis which in turn promotes the gastric tumor growth.
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Affiliation(s)
- Ling-fang He
- Immunology and Reproductive Biology Lab, Medical School & State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, PR China
| | - Ting-ting Wang
- Immunology and Reproductive Biology Lab, Medical School & State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, PR China
| | - Qian-ying Gao
- Immunology and Reproductive Biology Lab, Medical School & State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, PR China
| | - Guang-feng Zhao
- Immunology and Reproductive Biology Lab, Medical School & State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, PR China
| | - Ya-hong Huang
- Immunology and Reproductive Biology Lab, Medical School & State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, PR China
| | - Li-ke Yu
- First Department of Respiratory Medicine, Nanjing Chest Hospital, 215 Guangzhou Road, Nanjing, PR China
| | - Ya-yi Hou
- Immunology and Reproductive Biology Lab, Medical School & State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, PR China
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Westberg JA, Jiang J, Andersson LC. Stanniocalcin 1 binds hemin through a partially conserved heme regulatory motif. Biochem Biophys Res Commun 2011; 409:266-9. [DOI: 10.1016/j.bbrc.2011.05.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 05/01/2011] [Indexed: 10/18/2022]
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Expression of stanniocalcin-1 in gastrointestinal tracts of neonatal and mature rats. Biochem Biophys Res Commun 2009; 389:478-83. [PMID: 19732741 DOI: 10.1016/j.bbrc.2009.08.169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Accepted: 08/31/2009] [Indexed: 11/22/2022]
Abstract
Stanniocalcin-1 (STC-1) produced by ovaries endocrinologically targets to mammary glands and is secreted into milk during lactation. The decline of mother's serum level by STC-1 antiserum administration reduced the milk fat content and the pups' body fat content. Nevertheless, the pups' fecal fat content was increased, suggesting that milk-derived STC-1 could influence intestinal fat absorption. We investigated the STC-1 expression in rat gastrointestinal tissues using immunocytochemistry and in situ hybridization. STC-1 was widely expressed in the chief cells of gastric pits and the cells of intestinal glands. Goblet cells in the small intestine contained STC-1 protein in their mucus. The distribution shows that this peptide is secreted exocrinologically into the gastrointestinal lumen. Quantitative RT-PCR analysis revealed that the expression ratio was higher in the periods of heavy nutritional demand, such as growing and lactation. The endogenous STC-1, similar to milk-derived STC-1, may be involved in digestion and/or absorption in gastrointestinal organs.
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10
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Re RN, Cook JL. Senescence, apoptosis, and stem cell biology: the rationale for an expanded view of intracrine action. Am J Physiol Heart Circ Physiol 2009; 297:H893-901. [PMID: 19592610 PMCID: PMC2755987 DOI: 10.1152/ajpheart.00414.2009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2009] [Accepted: 07/02/2009] [Indexed: 12/28/2022]
Abstract
Some extracellular-signaling peptides also at times function within the intracellular space. We have termed these peptides intracrines and have argued that intracrine function is associated with a wide variety of peptides/proteins including hormones, growth factors, cytokines, enzymes, and DNA-binding proteins among others. Here we consider the possibility that intracrines participate in the related phenomena of senescence, apoptosis, and stem cell regulation of tissue biology. Based on this analysis, we also suggest that the concept of intracrine action be expanded to include possible regulatory peptide transfer via exosomes/microvesicles and possibly by nanotubes. Moreover, the process of microvesicular and nanotube transfer of peptides and other biologically relevant molecules, which we inclusively term laterality, is explored. These notions have potentially important therapeutic implications, including implications for the therapy of cardiovascular disease.
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Affiliation(s)
- Richard N Re
- Ochsner Clinic Foundation, New Orleans, LA 70121, USA.
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11
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Trindade DM, Silva JC, Navarro MS, Torriani ICL, Kobarg J. Low-resolution structural studies of human Stanniocalcin-1. BMC STRUCTURAL BIOLOGY 2009; 9:57. [PMID: 19712479 PMCID: PMC2744999 DOI: 10.1186/1472-6807-9-57] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Accepted: 08/27/2009] [Indexed: 11/10/2022]
Abstract
BACKGROUND Stanniocalcins (STCs) represent small glycoprotein hormones, found in all vertebrates, which have been functionally implicated in Calcium homeostasis. However, recent data from mammalian systems indicated that they may be also involved in embryogenesis, tumorigenesis and in the context of the latter especially in angiogenesis. Human STC1 is a 247 amino acids protein with a predicted molecular mass of 27 kDa, but preliminary data suggested its di- or multimerization. The latter in conjunction with alternative splicing and/or post-translational modification gives rise to forms described as STC50 and "big STC", which molecular weights range from 56 to 135 kDa. RESULTS In this study we performed a biochemical and structural analysis of STC1 with the aim of obtaining low resolution structural information about the human STC1, since structural information in this protein family is scarce. We expressed STC1 in both E. coli and insect cells using the baculo virus system with a C-terminal 6 x His fusion tag. From the latter we obtained reasonable amounts of soluble protein. Circular dichroism analysis showed STC1 as a well structured protein with 52% of alpha-helical content. Mass spectroscopy analysis of the recombinant protein allowed to assign the five intramolecular disulfide bridges as well as the dimerization Cys202, thereby confirming the conservation of the disulfide pattern previously described for fish STC1. SAXS data also clearly demonstrated that STC1 adopts a dimeric, slightly elongated structure in solution. CONCLUSION Our data reveal the first low resolution, structural information for human STC1. Theoretical predictions and circular dichroism spectroscopy both suggested that STC1 has a high content of alpha-helices and SAXS experiments revealed that STC1 is a dimer of slightly elongated shape in solution. The dimerization was confirmed by mass spectrometry as was the highly conserved disulfide pattern, which is identical to that found in fish STC1.
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Affiliation(s)
- Daniel M Trindade
- Centro de Biologia Molecular Estrutural (CEBIME), Campinas, SP, Brazil
- Instituto de Biologia, Departamento de Bioquímica, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Júlio C Silva
- Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Campinas, SP, Brazil
- Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, SP, Brazil
| | | | - Iris CL Torriani
- Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Campinas, SP, Brazil
- Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, SP, Brazil
| | - Jörg Kobarg
- Centro de Biologia Molecular Estrutural (CEBIME), Campinas, SP, Brazil
- Instituto de Biologia, Departamento de Bioquímica, Universidade Estadual de Campinas, Campinas, SP, Brazil
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Block GJ, Ohkouchi S, Fung F, Frenkel J, Gregory C, Pochampally R, DiMattia G, Sullivan DE, Prockop DJ. Multipotent stromal cells are activated to reduce apoptosis in part by upregulation and secretion of stanniocalcin-1. Stem Cells 2009; 27:670-681. [PMID: 19267325 DOI: 10.1002/stem.20080742] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Multipotent stromal cells (MSCs) have been shown to reduce apoptosis in injured cells by secretion of paracrine factors, but these factors were not fully defined. We observed that coculture of MSCs with previously UV-irradiated fibroblasts reduced apoptosis of the irradiated cells, but fresh MSC conditioned medium was unable reproduce the effect. Comparative microarray analysis of MSCs grown in the presence or absence of UV-irradiated fibroblasts demonstrated that the MSCs were activated by the apoptotic cells to increase synthesis and secretion of stanniocalcin-1 (STC-1), a peptide hormone that modulates mineral metabolism and has pleiotrophic effects that have not been fully characterized. We showed that STC-1 was required but not sufficient for reduction of apoptosis of UV-irradiated fibroblasts. In contrast, we demonstrated that MSC-derived STC-1 was both required and sufficient for reduction of apoptosis of lung cancer epithelial cells made apoptotic by incubation at low pH in hypoxia. Our data demonstrate that STC-1 mediates the antiapoptotic effects of MSCs in two distinct models of apoptosis in vitro.
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Affiliation(s)
- Gregory J Block
- Tulane Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, LA, 70112
| | - Shinya Ohkouchi
- Tulane Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, LA, 70112
| | - France Fung
- Tulane Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, LA, 70112
| | - Joshua Frenkel
- Tulane Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, LA, 70112
| | - Carl Gregory
- Tulane Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, LA, 70112
| | - Radhika Pochampally
- Tulane Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, LA, 70112
| | - Gabriel DiMattia
- London Regional Cancer Program and the Dept. of Oncology, Biochemistry, The University of Western Ontario
| | - Deborah E Sullivan
- Tulane University, Department of Microbiology and Immunology, New Orleans LA, 70112
| | - Darwin J Prockop
- Tulane Center for Gene Therapy, Tulane University Health Sciences Center, New Orleans, LA, 70112
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Tremblay G, Bernier-Dodier P, Delbecchi L, Wagner G, Talbot B, Lacasse P. Local control of mammary involution: Is stanniocalcin-1 involved? J Dairy Sci 2009; 92:1998-2006. [DOI: 10.3168/jds.2008-1643] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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14
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Chang ACM, Hook J, Lemckert FA, McDonald MM, Nguyen MAT, Hardeman EC, Little DG, Gunning PW, Reddel RR. The murine stanniocalcin 2 gene is a negative regulator of postnatal growth. Endocrinology 2008; 149:2403-10. [PMID: 18258678 DOI: 10.1210/en.2007-1219] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Stanniocalcin (STC), a secreted glycoprotein, was first studied in fish as a classical hormone with a role in regulating serum calcium levels. There are two closely related proteins in mammals, STC1 and STC2, with functions that are currently unclear. Both proteins are expressed in numerous mammalian tissues rather than being secreted from a specific endocrine gland. No phenotype has been detected yet in Stc1-null mice, and to investigate whether Stc2 could have compensated for the loss of Stc1, we have now generated Stc2(-/-) and Stc1(-/-) Stc2(-/-) mice. Although Stc1 is expressed in the ovary and lactating mouse mammary glands, like the Stc1(-/-) mice, the Stc1(-/-) Stc2(-/-) mice had no detected decrease in fertility, fecundity, or weight gain up until weaning. Serum calcium and phosphate levels were normal in Stc1(-/-) Stc2(-/-) mice, indicating it is unlikely that the mammalian stanniocalcins have a major physiological role in mineral homeostasis. Mice with Stc2 deleted were 10-15% larger and grew at a faster rate than wild-type mice from 4 wk onward, and the Stc1(-/-) Stc2(-/-) mice had a similar growth phenotype. This effect was not mediated through the GH/IGF-I axis. The results are consistent with STC2 being a negative regulator of postnatal growth.
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Affiliation(s)
- Andy C-M Chang
- Cancer Research Unit, The Children's Hospital, Westmead, New South Wales 2145, Australia
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15
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Sazonova O, James KA, McCudden CR, Segal D, Talebian A, Wagner GF. Stanniocalcin-1 secretion and receptor regulation in kidney cells. Am J Physiol Renal Physiol 2008; 294:F788-94. [PMID: 18199603 DOI: 10.1152/ajprenal.00553.2007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Kidney collecting duct principal cells are the main source of stanniocalcin-1 (STC-1) production and secretion. From there, the hormone targets thick ascending limb and distal convoluted tubule cells, as well as collecting duct cells. More specifically, STC-1 targets their mitochondria to exert putative antiapoptotic effects. Two distal tubule cell lines serve as models of STC-1 production and/or mechanism of action. Madin-Darby canine kidney-1 (MDCK-1) cells mimic collecting duct cells in their synthesis of STC-1 ligand and receptor, whereas inner medullary collecting duct-3 (IMCD-3) cells respond to additions of STC-1 by increasing their respiration rate. In the present study, MDCK cell STC-1 secretion was examined under normal and hypertonic conditions, vectorally, and in response to hormones and signal transduction pathway activators/inhibitors. STC-1 receptor regulation was monitored in both cell lines in response to changing ligand concentration. The results showed that NaCl-induced hypertonicity had concentration-dependent stimulatory effects on STC-1 secretion, as did the PKC activator TPA. Calcium and ionomycin were inhibitory, whereas calcium receptor agonists had no effect. Angiotensin II, aldosterone, atrial natriuretic factor, antidiuretic hormone, and forskolin also had no effects. Moreover, STC-1 secretion exhibited no vectoral preference. STC-1 receptors were insensitive to homologous downregulation in both cell lines. In contrast, they were upregulated when STC-1 secretion was inhibited by calcium. The findings suggest that hypertonicity-induced STC-1 secretion is regulated through PKC activation and that high intracellular calcium levels are a potent inhibitor of release. More intriguingly, the results suggest that the receptor may not accompany STC-1 in its passage to the mitochondria.
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Affiliation(s)
- Olga Sazonova
- Dept. of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Univ. of Western Ontario, London, Ontario, Canada N6A 5C1
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16
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Zaidi D, James KA, Wagner GF. Passive immunization of lactating mice with stanniocalcin-1 antiserum reduces mammary gland development, milk fat content, and postnatal pup growth. Am J Physiol Endocrinol Metab 2006; 291:E974-81. [PMID: 16772321 DOI: 10.1152/ajpendo.00601.2005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
During pregnancy and lactation in rodents, stanniocalcin-1 (STC-1) production by the ovaries is upregulated markedly and released into the circulation. The mammary glands are one target of this systemically delivered hormone. The purpose of this study was to lower serum levels of STC-1 in lactating mice through passive immunization so as to monitor the effects on mammary gland function and postnatal pup growth. Passive immunization significantly reduced circulating hormone levels, and pup growth was significantly compromised (30%), even though control and experimental litters had ingested equal amounts of milk. When mammary glands were analyzed, the alveolar area was significantly reduced in antibody-treated mothers. An analysis of milk composition revealed no changes in lactose, protein, or electrolyte levels but an approximately 40% reduction in triglyceride levels. The latter was due to a significant reduction in mammary gland lipoprotein lipase activity and led to a significant buildup of triglycerides in the serum. Body fat content was also significantly reduced in pups from antibody-treated mothers, whereas pup fecal fat content was increased. In mothers, passive immunization also caused significant behavioral effects, in particular, increased locomotor and hindleg rearing activities. Collectively, the results suggest that systemically derived STC-1 has important effects on mammary gland development and the transfer of serum-based triglycerides into milk. Locomotor effects suggest that STC-1 also has a role in maternal behavior.
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Affiliation(s)
- Deenaz Zaidi
- Department of Physiology and Pharmacology, Faculty of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
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Abstract
Stannniocalcin (STC) is a polypeptide hormone that was originally identified in bony fishes as a systemic regulator of mineral metabolism, and is best known for its regulatory effects on calcium/phosphate transport by the gills, gut and kidneys. The mammalian homolog to fish STC was discovered in 1995 and has resulted in progressively growing interest ever since as to its possible role in humans. Moreover, new discoveries in the mammalian STC field are resulting in significant reappraisals as to its role in fishes. Perhaps the most significant of these has been the discovery of a second gene encoding stanniocalcin-related protein, or STC-2, first in mammals and subsequently in fish. This review covers the comparative endocrinology of the STCs in fishes and mammals from the perspectives of structure, function and regulation. It then delves into some of the newer aspects of STC-1/STC-2 biology that have been uncovered using both classical and transgenic approaches. Of these, one of the most intriguing discoveries relates to the receptor-mediated sequestration of STC by target cell organelles. The functions of other newly discovered mammalian and fish STC variants are also discussed, as is the recent discovery of STC-related homologs in invertebrates. Based on our current state of knowledge, it is apparent that STC has an ancient lineage and that the STC family of proteins is proving to have significant roles in metabolism, reproduction and development.
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Affiliation(s)
- Graham F Wagner
- Department of Physiology and Pharmacology, Faculty of Medicine and Dentistry, University of Western Ontario, London, Canada.
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