1
|
Grasso P. Harnessing the Power of Leptin: The Biochemical Link Connecting Obesity, Diabetes, and Cognitive Decline. Front Aging Neurosci 2022; 14:861350. [PMID: 35527735 PMCID: PMC9072663 DOI: 10.3389/fnagi.2022.861350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 03/21/2022] [Indexed: 12/02/2022] Open
Abstract
In this review, the current understanding of leptin’s role in energy balance, glycemic regulation, and cognitive function is examined, and its involvement in maintaining the homeostatic “harmony” of these physiologies is explored. The effects of exercise on circulating leptin levels are summarized, and the results of clinical application of leptin to metabolic disease and neurologic dysfunction are reviewed. Finally, pre-clinical evidence is presented which suggests that synthetic peptide leptin mimetics may be useful in resolving not only the leptin resistance associated with common obesity and other elements of metabolic syndrome, but also the peripheral insulin resistance characterizing type 2 diabetes mellitus, and the central insulin resistance associated with certain neurologic deficits in humans.
Collapse
Affiliation(s)
- Patricia Grasso
- Department of Medicine, Albany Medical College, Albany, NY, United States
- Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, United States
- *Correspondence: Patricia Grasso,
| |
Collapse
|
2
|
Chung CC, Huang TY, Chu HR, De Luca R, Candelotti E, Huang CH, Yang YCSH, Incerpi S, Pedersen JZ, Lin CY, Huang HM, Lee SY, Li ZL, ChangOu CA, Li WS, Davis PJ, Lin HY, Whang-Peng J, Wang K. Heteronemin and tetrac derivatives suppress non-small cell lung cancer growth via ERK1/2 inhibition. Food Chem Toxicol 2022; 161:112850. [PMID: 35151786 DOI: 10.1016/j.fct.2022.112850] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 01/19/2022] [Accepted: 02/01/2022] [Indexed: 12/14/2022]
Abstract
The most common cancer, lung cancer, causes deaths worldwide. Most lung cancer patients have non-small cell lung carcinomas (NSCLCs) with a poor prognosis. The chemotherapies frequently cause resistance therefore search for new effective drugs for NSCLC patients is an urgent and essential issue. Deaminated thyroxine, tetraiodothyroacetic acid (tetrac), and its nano-analogue (NDAT) exhibit antiproliferative properties in several types of cancers. On the other hand, the most abundant secondary metabolite in the sponge Hippospongia sp., heteronemin, shows effective cytotoxic activity against different types of cancer cells. In the current study, we investigated the anticancer effects of heteronemin against two NSCLC cell lines, A549 and H1299 cells in vitro. Combined treatment with heteronemin and tetrac derivatives synergistically inhibited cancer cell growth and significantly modulated the ERK1/2 and STAT3 pathways in A549 cells but only ERK1/2 in H1299 cells. The combination treatments induce apoptosis via the caspases pathway in A549 cells but promote cell cycle arrest via CCND1 and PCNA inhibition in H1299 cells. In summary, these results suggest that combined treatment with heteronemin and tetrac derivatives could suppress signal transduction pathways essential for NSCLC cell growth. The synergetic effects can be used potentially as a therapeutic procedure for NSCLC patients.
Collapse
Affiliation(s)
- Cheng-Chin Chung
- Graduate Institute of Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University and Academia Sinica, Taipei, Taiwan; Taipei Medical University Hospital, Taipei Medical University, Taipei, Taiwan.
| | - Tung-Yung Huang
- Graduate Institute of Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, Taiwan.
| | - Hung-Ru Chu
- Graduate Institute of Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, Taiwan.
| | | | | | - Chi-Hung Huang
- Division of Cardiology, Department of Internal Medicine, Cathay General Hospital, Taipei, Taiwan.
| | - Yu-Chen S H Yang
- Joint Biobank, Office of Human Research, Taipei Medical University, Taipei, Taiwan.
| | - Sandra Incerpi
- Department of Sciences, University Roma Tre, Rome, Italy.
| | - Jens Z Pedersen
- Department of Biology, University of Rome Tor Vergata, Rome, Italy.
| | - Chi-Yu Lin
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.
| | - Haw-Ming Huang
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan.
| | - Sheng-Yang Lee
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan; Core Facility Center, Office of Research and Development, Taipei Medical University, Taipei, Taiwan.
| | - Zi-Lin Li
- Graduate Institute of Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, Taiwan.
| | - Chun A ChangOu
- Integrated Laboratory, Center of Translational Medicine, Taipei Medical University, Taipei, Taiwan; Laboratory of Chemical Biology and Medicinal Chemistry, Institute of Chemistry, Academia Sinica, Taipei, Taiwan.
| | - Wen-Shan Li
- Doctoral Degree Program in Marine Biotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan.
| | - Paul J Davis
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, USA; Department of Medicine, Albany Medical College, Albany, NY, USA.
| | - Hung-Yun Lin
- Graduate Institute of Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan; Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, USA; TMU Research Center of Cancer Translational Medicine, Taipei Medical University, Taipei, Taiwan; Traditional Herbal Medicine Research Center of Taipei Medical University Hospital, Taipei Medical University, Taipei, Taiwan; Cancer Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.
| | - Jacqueline Whang-Peng
- Graduate Institute of Cancer Molecular Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan; Cancer Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.
| | - Kuan Wang
- Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, Taiwan.
| |
Collapse
|
3
|
Zhou M, Zhao J, Zhang Q, Jin X, Liao M, Zhang L, Wang J, Yang M. Nicotine Upregulates the Level of Mcl-1 through STAT3 in H1299 Cells. J Cancer 2020; 11:1270-1276. [PMID: 31956373 PMCID: PMC6959082 DOI: 10.7150/jca.35453] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 11/13/2019] [Indexed: 12/11/2022] Open
Abstract
Background: Nicotine contributes to development of human lung cancer and chemoresistance through activation of myeloid cell leukemia-1 (Mcl-1). Signal transducer and activator of transcription 3 (STAT3) generally participates in development and progression of human cancers. Therefore, we examined the STAT3 cascade in nicotine regulation of Mcl-1 transcription in human lung cancer cells. Methods: The effects of nicotine on the expression of STAT3 and Mcl-1 were determined using western blot. The sub-cellular localization was tested using immunofluorescence. The activity of STAT3 promoter was checked using dual luciferase reporter assay. Results: STAT3 was constitutively activated (i.e., tyrosine-phosphorylated, serine-phosphorylated and nuclear translocation), meanwhile the expression and transcriptional activity of Mcl-1 were up-regulated in lung cancer cells following treatment with nicotine. Transfection with siRNA targeting STAT3 or treatment with STAT3 inhibitor JSI-124 diminished Mcl-1 protein levels. Deleted mutagenesis of a putative STAT3 consensus binding sequence decreased Mcl-1 promoter activity and eliminated the increase of Mcl-1 promoter activity induced by nicotine. Abnormally, JAK (Jannus kinase) inhibitor AG490 can't induce the downregulation of Mcl-1 or inhibit the tyrosine-phosphorylation of STAT3. In addition, deactivated mutagenesis of STAT3 the tyrosine 705 site had no effect on the aggregation of STAT3 into nucleus induced by nicotine. Conclusions: We have demonstrated that nicotine induces up-regulation of Mcl-1 through STAT3, which process may be independent on JAKs and not only dependent on the phosphorylation of Y705. Downregulation of Mcl-1 transcription by inhibiting STAT3 cascade may be a potential strategy for the treatment of this cancer.
Collapse
Affiliation(s)
- Maojun Zhou
- Key Laboratory of Cancer Proteomics of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Jinfeng Zhao
- Key Laboratory of Nanobiological Technology of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Qi Zhang
- Department of Hepatobiliary & Pancreatic Surgery, Xiangya Hospital, Central South University, Changsha, China
| | - Xin Jin
- Key Laboratory of Nanobiological Technology of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Mingmei Liao
- Key Laboratory of Nanobiological Technology of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Lihua Zhang
- Key Laboratory of Nanobiological Technology of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Jiwei Wang
- Key Laboratory of Nanobiological Technology of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Manyi Yang
- Key Laboratory of Nanobiological Technology of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| |
Collapse
|
4
|
Ho Y, Wang SH, Chen YR, Li ZL, Chin YT, Yang YCSH, Wu YH, Su KW, Chu HR, Chiu HC, Crawford DR, Shih YJ, Grasso P, Tang HY, Lin HY, Davis PJ, Whang-Peng J, Wang K. Leptin-derived peptides block leptin-induced proliferation by reducing expression of pro-inflammatory genes in hepatocellular carcinoma cells. Food Chem Toxicol 2019; 133:110808. [PMID: 31499123 DOI: 10.1016/j.fct.2019.110808] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 09/02/2019] [Accepted: 09/05/2019] [Indexed: 02/05/2023]
Abstract
The obesity-regulated gene, leptin, is essential for diet. Leptin resistance causes obesity and related diseases. Certain types of diet are able to decrease leptin resistance. However, leptin has been shown to be correlated with inflammation and stimulate proliferation of various cancers. Two synthetic leptin derivatives (mimetics), OB3 and [D-Leu-4]-OB3, show more effective than leptin in reducing obesity and diabetes in mouse models. OB3 inhibits leptin-induced proliferation in ovarian cancer cells. However, effects of these mimetics in hepatocellular carcinoma (HCC) have not been investigated. In the present study, we examined the effects of OB3 and [D-Leu-4]-OB3 on cell proliferation and gene expressions in human HCC cell cultures. In contrast to what was reported for leptin, OB3 and [D-Leu-4]-OB3 reduced cell proliferation in hepatomas. Both OB3 and [D-Leu-4]-OB3 stimulated expression of pro-apoptotic genes. Both compounds also inhibited expressions of pro-inflammatory, proliferative and metastatic genes and PD-L1 expression. In combination with leptin, OB3 inhibited leptin-induced cell proliferation and expressions of pro-inflammation-, and proliferation-related genes. Furthermore, the OB3 peptide inhibited phosphoinositide 3-kinase (PI3K) activation which is essential for leptin-induced proliferation in HCC. These results indicate that OB3 and [D-Leu-4]-OB3 may have the potential to reduce leptin-related inflammation and proliferation in HCC cells.
Collapse
Affiliation(s)
- Yih Ho
- School of Pharmacy, Taipei Medical University, Taipei, 11031, Taiwan
| | - Shwu-Huey Wang
- Taipei Cancer Center, Taipei Medical University, Taipei, 11031, Taiwan; Core Facility Center, Department of Research Development, Taipei Medical University, Taipei, 11031, Taiwan
| | - Yi-Ru Chen
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| | - Zi-Lin Li
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| | - Yu-Tang Chin
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Cancer Center, Wan Fang Hospital, Taipei Medical University, Taipei, 11031, Taiwan
| | - Yu-Chen S H Yang
- Joint Biobank, Office of Human Research, Taipei Medical University, Taipei, 11031, Taiwan
| | - Yun-Hsuan Wu
- Institute of Sociology, Academia Sinica, Taipei, Taiwan
| | - Kuan-Wei Su
- Department of Dentistry, Hsinchu MacKay Memorial Hospital, Hsinchu City, Taiwan
| | - Hung-Ru Chu
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| | - Hsien-Chung Chiu
- Department of Periodontology, School of Dentistry, National Defense Medical, Center and Tri-Service General Hospital, Taipei, Taiwan
| | - Dana R Crawford
- Center for Immunology and Microbial Disease, Albany Medical College, Albany, NY, USA
| | - Ya-Jung Shih
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| | - Patricia Grasso
- Department of Medicine, Division of Endocrinology and Metabolism, Department of Neuroscience and Experimental Therapeutics, Albany Medical College, Albany, NY, USA
| | - Heng-Yuan Tang
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, USA
| | - Hung-Yun Lin
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Cancer Center, Wan Fang Hospital, Taipei Medical University, Taipei, 11031, Taiwan; Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, USA; Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan; TMU Research Center of Cancer Translational Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Traditional Herbal Medicine Research Center of Taipei Medical University Hospital, Taipei Medical University, Taipei, Taiwan.
| | - Paul J Davis
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, USA; Department of Medicine, Albany Medical College, Albany, NY, USA
| | - Jacqueline Whang-Peng
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Cancer Center, Wan Fang Hospital, Taipei Medical University, Taipei, 11031, Taiwan; Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan
| | - Kuan Wang
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, Taipei Medical University, Taipei, 11031, Taiwan; Graduate Institute of Nanomedicine and Medical Engineering, College of Medical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| |
Collapse
|
5
|
Novel leptin OB3 peptide-induced signaling and progression in thyroid cancers: Comparison with leptin. Oncotarget 2018; 7:27641-54. [PMID: 27050378 PMCID: PMC5053677 DOI: 10.18632/oncotarget.8505] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 03/18/2016] [Indexed: 12/25/2022] Open
Abstract
Obesity results in increased secretion of cytokines from adipose tissue and is a risk factor for various cancers. Leptin is largely produced by adipose tissue and cancer cells. It induces cell proliferation and may serve to induce various cancers. OB3-leptin peptide (OB3) is a new class of functional leptin peptide. However, its mitogenic effect has not been determined. In the present study, because of a close link between leptin and the hypothalamic-pituitary-thyroid axis, OB3 was compared with leptin in different thyroid cancer cells for gene expression, proliferation and invasion. Neither agent stimulated cell proliferation. Leptin stimulated cell invasion, but reduced adhesion in anaplastic thyroid cancer cells. Activated ERK1/2 and STAT3 contributed to leptin-induced invasion. In contrast, OB3 did not affect expression of genes involved in proliferation and invasion. In vivo studies in the mouse showed that leptin, but not OB3, significantly increased circulating levels of thyrotropin (TSH), a growth factor for thyroid cancer. In summary, OB3 is a derivative of leptin that importantly lacks the mitogenic effects of leptin on thyroid cancer cells.
Collapse
|
6
|
Chin YT, Wang LM, Hsieh MT, Shih YJ, Nana AW, Changou CA, Yang YCSH, Chiu HC, Fu E, Davis PJ, Tang HY, Lin HY. Leptin OB3 peptide suppresses leptin-induced signaling and progression in ovarian cancer cells. J Biomed Sci 2017; 24:51. [PMID: 28750624 PMCID: PMC5532776 DOI: 10.1186/s12929-017-0356-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 07/20/2017] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Obesity and its comorbidities constitute a serious health burden worldwide. Leptin plays an important role in diet control; however, it has a stimulatory potential on cancer cell proliferation. The OB3 peptide, a synthetic peptide, was shown to be more active than leptin in regulating metabolism but with no mitogenic effects in cancer cells. METHODS In this study, we investigated the proliferative effects, gene expressions and signaling pathways modulated by leptin and OB3 in human ovarian cancer cells. In addition, an animal study was performed. RESULTS Leptin, but not OB3, induced the proliferation of ovarian cancer cells. Interestingly, OB3 blocked the leptin-induced proliferative effect when it was co-applied with leptin. Both leptin and OB3 activated the phosphatidylinositol-3-kinase (PI3K) signal transduction pathway. In addition, leptin stimulated the phosphorylation of signal transducer and activator of transcription-3 (STAT3) Tyr-705 as well as estrogen receptor (ER)α, and the expression of ERα-responsive genes. Interestingly, all leptin-induced signal activation and gene expressions were blocked by the co-incubation with OB3 and the inhibition of extracellular signal-regulated kinase (ERK)1/2. Coincidently, leptin, but not OB3, increased circulating levels of follicle-stimulating hormone (FSH) which is known to play important roles in the initiation and proliferation of ovarian cancer cells. CONCLUSIONS In summary, our findings suggest that the OB3 peptide may prevent leptin-induced ovarian cancer initiation and progression by disrupting leptin-induced proliferative signals via STAT3 phosphorylation and ERα activation. Therefore, the OB3 peptide is a potential anticancer agent that might be employed to prevent leptin-induced cancers in obese people.
Collapse
Affiliation(s)
- Yu-Tang Chin
- Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan.,Department of Dentistry, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Le-Ming Wang
- Department of Obstetrics and Gynecology, Wan-Fang Hospital, Taipei, Taiwan
| | - Meng-Ti Hsieh
- Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan.,PhD Program for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei, 11031, Taiwan
| | - Ya-Jung Shih
- Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan.,PhD Program for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei, 11031, Taiwan
| | - André Wendindondé Nana
- PhD Program for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei, 11031, Taiwan
| | - Chun A Changou
- PhD Program for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei, 11031, Taiwan.,Integrated Laboratory, Center of Translational Medicine, Taipei Medical University, Taipei, Taiwan.,Core Facility, Taipei Medical University, Taipei, Taiwan
| | - Yu-Chen S H Yang
- Joint Biobank, Office of Human Research, Taipei Medical University, Taipei, Taiwan
| | - Hsien-Chung Chiu
- Department of Periodontology, School of Dentistry, National Defense Medical Center and Tri-Service General Hospital, Taipei, Taiwan
| | - Earl Fu
- Department of Dentistry, Taipei Tzu Chi Hospital Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan
| | - Paul J Davis
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, USA
| | - Heng-Yuan Tang
- Pharmaceutical Research Institute, Albany College of Pharmacy and Health Sciences, Albany, NY, USA
| | - Hung-Yun Lin
- Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan. .,PhD Program for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei, 11031, Taiwan.
| |
Collapse
|
7
|
Oral delivery of [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3, synthetic peptide leptin mimetics: Immunofluorescent localization in the mouse hypothalamus. Brain Res 2017; 1664:1-8. [PMID: 28347670 DOI: 10.1016/j.brainres.2017.03.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 02/07/2017] [Accepted: 03/20/2017] [Indexed: 11/24/2022]
Abstract
This study describes the localization of [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3, synthetic peptide leptin mimetics, in the hypothalamus of Swiss Webster and C57BL/6J wild-type mice, leptin-deficient ob/ob mice, and leptin-resistant diet-induced obese (DIO) mice. The mice were given [D-Leu-4]-OB3 or MA-[D-Leu-4]-OB3 in 0.3% dodecyl maltoside by oral gavage. Once peak serum concentrations were reached, the mice received a lethal dose of pentobarbital and were subjected to intracardiac perfusion fixation. The brains were excised, post-fixed in paraformaldehyde, and cryo-protected in sucrose. Free-floating frozen coronal sections were cut at 25-µm and processed for imaging by immunofluorescence microscopy. In all four strains of mice, dense staining was concentrated in the area of the median eminence, at the base and/or along the inner wall of the third ventricle, and in the brain parenchyma at the level of the arcuate nucleus. These results indicate that [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3 cross the blood-brain barrier and concentrate in an area of the hypothalamus known to regulate energy balance and glucose homeostasis. Most noteworthy is the localization of [D-Leu-4]-OB3 immunoreactivity within the hypothalamus of DIO mice via a conduit that is closed to leptin in this rodent model, and in most cases of human obesity. Together with our previous studies describing the effects of [D-Leu-4]-OB3 and MA-[D-Leu-4]-OB3 on energy balance, glucose regulation, and signal transduction pathway activation, these findings are consistent with a central mechanism of action for these synthetic peptide leptin mimetics, and suggest their potential usefulness in the management of leptin-resistant obesity and type 2 diabetes in humans.
Collapse
|
8
|
Dias CC, Nogueira-Pedro A, Tokuyama PY, Martins MNC, Segreto HRC, Buri MV, Miranda A, Paredes-Gamero EJ. A synthetic fragment of leptin increase hematopoietic stem cell population and improve its engraftment ability. J Cell Biochem 2016; 116:1334-40. [PMID: 25735790 DOI: 10.1002/jcb.25090] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 01/16/2015] [Indexed: 02/06/2023]
Abstract
Several studies have shown the important actions of cytokine leptin that regulates food intake and energy expenditure. Additionally, the ability to modulate hematopoiesis has also been demonstrated. Previous reports have shown that some synthetic sequences of leptin molecules can activate leptin receptor. Herein, decapeptides encompassing amino acids from positions 98 to 122 of the leptin molecule were constructed to evaluate their effects on hematopoiesis. Among them, the synthetic peptide Lep(110-119)-NH2 (LEP F) was the only peptide that possessed the ability to increase the percentage of hematopoietic stem cells (HSC). Moreover, LEP F also produced an increase of granulocyte/macrophage colony-forming units and activated leptin receptor. Furthermore, LEP F also improves the grafting of HSC in bone marrow, but did not accelerate the recovery of bone marrow after ablation with 5-fluorouracil. These results show that LEP F is a positive modulator of the in vivo expansion of HSC and could be useful in bone marrow transplantation.
Collapse
Affiliation(s)
- Carolina C Dias
- Departamento de Bioquímica, Universidade Federal de São Paulo, Rua Três de Maio 100, São Paulo, SP, 04044-020, Brazil
| | - Amanda Nogueira-Pedro
- Departmento de Biofísica, Universidade Federal de São Paulo, Rua Três de Maio 100, São Paulo, SP, 04044-020, Brazil
| | - Paula Yumi Tokuyama
- Departmento de Biofísica, Universidade Federal de São Paulo, Rua Três de Maio 100, São Paulo, SP, 04044-020, Brazil
| | - Marta N C Martins
- Departmento de Biofísica, Universidade Federal de São Paulo, Rua Três de Maio 100, São Paulo, SP, 04044-020, Brazil
| | - Helena Regina Comodo Segreto
- Departamento de Oncologia Clínica e Experimental, Universidade Federal de São Paulo, R. Napoleão de Barros, 715, São Paulo, Brazil
| | - Marcus V Buri
- Departamento de Bioquímica, Universidade Federal de São Paulo, Rua Três de Maio 100, São Paulo, SP, 04044-020, Brazil
| | - Antonio Miranda
- Departmento de Biofísica, Universidade Federal de São Paulo, Rua Três de Maio 100, São Paulo, SP, 04044-020, Brazil
| | - Edgar J Paredes-Gamero
- Departamento de Bioquímica, Universidade Federal de São Paulo, Rua Três de Maio 100, São Paulo, SP, 04044-020, Brazil.,Centro Interdisciplinar de Investigação Bioquímica, Universidade de Mogi das Cruzes, Mogi das Cruzes, SP, Brazil
| |
Collapse
|
9
|
Meredith TL, Corcoran A, Roper SD. Leptin's effect on taste bud calcium responses and transmitter secretion. Chem Senses 2014; 40:217-22. [PMID: 25537017 DOI: 10.1093/chemse/bju066] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Leptin, a peptide hormone released by adipose tissue, acts on the hypothalamus to control cravings and appetite. Leptin also acts to decrease taste responses to sweet substances, though there is little detailed information regarding where leptin acts in the taste transduction cascade. The present study examined the effects of leptin on sweet-evoked responses and neuro transmitter release from isolated taste buds. Our results indicate that leptin moderately decreased sweet-evoked calcium mobilization in isolated mouse taste buds. We also employed Chinese hamster ovary biosensor cells to examine taste transmitter release from isolated taste buds. Leptin reduced ATP and increased serotonin release in response to sweet stimulation. However, leptin has no effect on bitter-evoked transmitter release, further showing that the action of leptin is sweet specific. Our results support those of previous studies, which state that leptin acts on taste tissue via the leptin receptor, most likely on Type II (Receptor) cells, but also possibly on Type III (Presynaptic) cells.
Collapse
Affiliation(s)
- Tricia L Meredith
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, 1600 NW 10th Avenue, Miami, FL 33136, USA and Present address: Department of Biological Sciences, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, USA
| | - Alan Corcoran
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, 1600 NW 10th Avenue, Miami, FL 33136, USA and
| | - Stephen D Roper
- Department of Physiology and Biophysics, Miller School of Medicine, University of Miami, 1600 NW 10th Avenue, Miami, FL 33136, USA and Program in Neuroscience, Miller School of Medicine, University of Miami, 1600 NW 10th Avenue, Miami, FL 33136, USA
| |
Collapse
|
10
|
Novakovic ZM, Anderson BM, Grasso P. Myristic acid conjugation of [D-Leu-4]-OB3, a biologically active leptin-related synthetic peptide amide, significantly improves its pharmacokinetic profile and efficacy. Peptides 2014; 62:176-82. [PMID: 25453979 DOI: 10.1016/j.peptides.2014.10.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 10/14/2014] [Accepted: 10/14/2014] [Indexed: 11/29/2022]
Abstract
We have previously described the pharmacokinetics of mouse [D-Leu-4]-OB3, a synthetic peptide amide with leptin-like activity, following delivery by subcutaneous (SC), intraperitoneal (IP), and intramuscular (IM) injection, and by oral gavage and intranasal instillation. These profiles suggested that the observed efficacy of [D-Leu-4]-OB3 on energy balance, glycemic control, and bone turnover in ob/ob and db/db mice might be improved by efforts directed toward improving its bioavailability, i.e., increasing maximum uptake (Cmax), extending serum half-life (t½), and reducing plasma clearance (CL). To address these issues, myristic (tetradecanoic) acid was conjugated to the N-terminal of [D-Leu-4]-OB3 (designated MA-[D-Leu-4]-OB3), and the pharmacokinetics of MA-[D-Leu-4]-OB3 in male Swiss Webster mice following SC, IP, and IM injection in PBS, and by oral and intranasal delivery in dodecyl maltoside (DDM, trade name Intravail®), a transmucosal absorption enhancing agent, were compared to those of [D-Leu-4]-OB. At a dose of MA-[D-Leu-4]-OB3 10-fold lower than that used previously for [D-Leu-4]-OB3 (0.1 mg vs.1.0 mg, respectively), Cmax of MA-[D-Leu-4]-OB3 was 11.1-, 7.5-, 1.9-, and 1.7-fold higher, t1/2 was 3.5-, 5.0-, 9.1-, and 86.7-fold longer, and CL was 17.0-, 11.6-, 5.7-, and 5.0-fold slower than [D-Leu-4]-OB3 following SC, IP, IM, and oral delivery, respectively. Furthermore, in leptin-resistant obese male db/db mice, oral delivery of MA-[D-Leu-4]-OB3 in DDM at concentrations up to 10-fold lower than those used with [D-Leu-4]-OB3 reduced fasting blood glucose levels in a dose-related manner.
Collapse
|
11
|
Ramos CF, Zamoner A. Thyroid hormone and leptin in the testis. Front Endocrinol (Lausanne) 2014; 5:198. [PMID: 25505448 PMCID: PMC4243692 DOI: 10.3389/fendo.2014.00198] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 11/10/2014] [Indexed: 12/18/2022] Open
Abstract
Leptin is primarily expressed in white adipose tissue; however, it is expressed in the hypothalamus and reproductive tissues as well. Leptin acts by activating the leptin receptors (Ob-Rs). Additionally, the regulation of several neuroendocrine and reproductive functions, including the inhibition of glucocorticoids and enhancement of thyroxine and sex hormone concentrations in human beings and mice are leptin functions. It has been suggested that thyroid hormones (TH) could directly regulate leptin expression. Additionally, hypothyroidism compromises the intracellular integration of leptin signaling specifically in the arcuate nucleus. Two TH receptor isoforms are expressed in the testis, TRa and TRb, with TRa being the predominant one that is present in all stages of development. The effects of TH involve the proliferation and differentiation of Sertoli and Leydig cells during development, spermatogenesis, and steroidogenesis. In this context, TH disorders are associated with sexual dysfunction. An endocrine and/or direct paracrine effect of leptin on the gonads inhibits testosterone production in Leydig cells. Further studies are necessary to clarify the effects of both hormones in the testis during hypothyroidism. The goal of this review is to highlight the current knowledge regarding leptin and TH in the testis.
Collapse
Affiliation(s)
- Cristiane Fonte Ramos
- Laboratory of Morphometry, Metabolism and Cardiovascular Disease, Department of Anatomy, Biomedical Center, Institute of Biology, State University of Rio de Janeiro, Rio de Janeiro, Brazil
- *Correspondence: Cristiane Fonte Ramos, Laboratório de Morfometria, Metabolismo e Doença Cardiovascular, Centro Biomédico, Instituto de Biologia, Universidade do Estado do Rio de Janeiro. Av 28 de Setembro 87 fds, Rio de Janeiro 20551-030, RJ, Brazil e-mail:
| | - Ariane Zamoner
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Brazil
| |
Collapse
|