Stz Induced Diabetes I Rats
I have been working on STZ induced diabetes type I model in rats. I have used 60mg/Kg and 55mg/Kg dose of STZ. induction was good. Can anybody tell me a drug/compound to be used as method control. Ihave used tolbutamide, based on several papers, but it didnt even work slightly. Also I have used Glibenclamide, didnt work. One more thing the blood glucose level rise in my animals was always more than 500mg/dL upto 800mg/dL but most of the papers say 250-350mg/dL. So im confused. Another thing if I reduce the STZ dose will the hyperglycemia level reduce? I fear about the induction percentage.. If you are inducing diabetes type I to make a rat model for the 'first' time you need to standardize your protocol. Have you gone through any research article where STZhas been used to induce this effect? If yes try to follow their protocol and if you are doing it on your own then you need to firt standardize the minimum dosage that precipitates the effects. First check these things then only you should proceed further. As I mentioned earlier too, I have gone through a lot of literature. By the way I have followed a standard protocol after going thru current protocols as well. only thing is I wana know if anybody has any experience with using any standard drug. I have used STZ extensively for the last 3 years. Im a little confused as to what type of control drug you are looking for? As far as the glucose levels in your rats go, if they are hitting 800 mg/dl then you are treating them with too much STZ. Im sure each batch of STZ is different in potency and must be tested for onset of diabetes. In my hands 50mg/kg brought on diabetes 250 mg/dl in 4 weeks after injection. After a few weeks, they animals either went on to full blown diabetes (blood glucose >500 mg/dl) or sometimes recov Continue reading >>
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Streptozotocin-induced Experimental Diabetes In Male Wistar Rats.
Gen Physiol Biophys. 1999 Oct;18 Spec No:54-62. Streptozotocin-induced experimental diabetes in male Wistar rats. Institute of Experimental Pharmacology Slovak Academy of Sciences, Bratislava. The aim of the present work was to test the sensitivity of young male Wistar rats, Dobr Voda (Dv:WI) to the diabetogenic effect of streptozotocin (STZ) with regard to their health condition and mortality rates. Eight-week-old rats, weighing from 200 to 230 g, were randomised into five groups of eight animals. Streptozotocin was administered by i.v. injection in doses of 40, 50, 60 and 70 mg/kg body weight. The animals were kept on a standard diet with free access to water for 4 months. The highest STZ dose (70 mg/kg) was lethal to the animals, the doses of 50 and 60 mg/kg induced persistent hyperglycaemia with glucose levels above 20 mM. Body weights of STZ treated rats from all experimental groups were significantly lower than those of control animals. Considerable polyuria was observed in all STZ treated rats. About 40% of the STZ treated animals were found to develop overt cataract between days 90 and 100. At the end of the experiment, significant albuminuria was observed in the experimental groups administered 50 and 60 mg/kg STZ doses. We conclude that young male Wistar rats, Breeding Facility Dobr Voda (Dv:WI), Slovakia, treated by a single i.v. STZ dose of 50 or 60 mg/kg developed a persistent disease state characterised by severe hyperglycaemia with major clinical signs of diabetes mellitus. Continue reading >>
Jci -multiple Low-dose Streptozotocin-induced Diabetes In The Mouse. Evidence For Stimulation Of A Cytotoxic Cellular Immune Response Against An Insulin-producing Beta Cell Line.
Mice were examined for the presence of splenocytes specifically cytotoxic for a rat insulinoma cell line (RIN) during the induction of diabetes by streptozotocin (SZ) in multiple low doses (Multi-Strep). Cytotoxicity was quantitated by the release of 51Cr from damaged cells. A low but statistically significant level of cytolysis (5%) by splenocytes was first detectable on day 8 after the first dose of SZ. The cytotoxicity reached a maximum of approximately 9% on day 10 and slowly decreased thereafter, becoming undetectable 42 d after SZ was first given. The time course of the in vitro cytotoxic response correlated with the degree of insulitis demonstrable in the pancreata of the Multi-Strep mice. The degree of cytotoxicity after Multi-Strep was related to the number of effector splenocytes to which the target RIN cells were exposed and was comparable to that detectable after immunization by intraperitoneal injection of RIN cells in normal mice. The cytotoxicity was specific for insulin-producing cells; syngeneic, allogeneic, and xenogeneic lymphocytes and lymphoblasts, 3T3 cells, and a human keratinocyte cell line were not specifically lysed by the splenocytes of the Multi-Strep mice. This phenomenon was limited to the Multi-Strep mice. Splenocytes from mice made diabetic by a single, high dose of SZ exhibited a very low level of cytotoxicity against the RIN cells. The cytotoxic response was also quantitated in splenocytes from control and Multi-Strep mice (10 d after the first dose of SZ) before and after culture with mitomycin-treated RIN cells in the presence of T cell growth factor (TCGF). The cytotoxicity of the Multi-Strep splenocytes was enhanced more than fivefold after such culture, suggesting the proliferation of an effector cell that could be stimulated and Continue reading >>
Springerprotocols: Full Text: Streptozotocin, Type I Diabetes Severity And Bone
Streptozotocin, Type I Diabetes Severity and Bone As many as 50% of adults with type I (T1) diabetes exhibit bone loss and are at increased risk for fractures. Therapeutic development to prevent bone loss and/or restore lost bone in T1 diabetic patients requires knowledge of the molecular mechanisms accounting for the bone pathology. Because cell culture models alone cannot fully address the systemic/metabolic complexity of T1 diabetes, animal models are critical. A variety of models exist including spontaneous and pharmacologically induced T1 diabetic rodents. In this paper, we discuss the streptozotocin (STZ)-induced T1 diabetic mouse model and examine dose-dependent effects on disease severity and bone. Five daily injections of either 40 or 60mg/kg STZ induce bone pathologies similar to spontaneously diabetic mouse and rat models and to human T1 diabetic bone pathology. Specifically, bone volume, mineral apposition rate, and osteocalcin serum and tibia messenger RNA levels are decreased. In contrast, bone marrow adiposity and aP2 expression are increased with either dose. However, high-dose STZ caused a more rapid elevation of blood glucose levels and a greater magnitude of change in body mass, fat pad mass, and bone gene expression (osteocalcin, aP2). An increase in cathepsin K and in the ratio of RANKL/OPG was noted in high-dose STZ mice, suggesting the possibility that severe diabetes could increase osteoclast activity, something not seen with lower doses. This may contribute to some of the disparity between existing studies regarding the role of osteoclasts in diabetic bone pathology. Examination of kidney and liver toxicity indicate that the high STZ dose causes some liver inflammation. In summary, the multiple low-dose STZ mouse model exhibits a similar bone p Continue reading >>
The Characterization Of High-fat Diet And Multiple Low-dose Streptozotocin Induced Type 2 Diabetes Rat Model
The Characterization of High-Fat Diet and Multiple Low-Dose Streptozotocin Induced Type 2 Diabetes Rat Model Department of Pharmacology, School of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, China Received 5 June 2008; Revised 14 October 2008; Accepted 19 November 2008 Copyright 2008 Ming Zhang et al. This is an open access article distributed under the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Aim. Based on the previously established method, we developed a better and stable animal model of type 2 diabetes mellitus by high-fat diet combined with multiple low-dose STZ injections. Meanwhile, this new model was used to evaluate the antidiabetic effect of berberine. Method. Wistar male rats fed with regular chow for 4 weeks received vehicle (control groups), rats fed with high-fat diet for 4 weeks received different amounts of STZ once or twice by intraperitoneal injection (diabetic model groups), and diabetic rats were treated with berberine (100 mg/kg, berberine treatment group). Intraperitoneal glucose tolerance test and insulin tolerance test were carried out. Moreover, fasting blood glucose, fasting insulin, total cholesterol, and triglyceride were measured to evaluate the dynamic blood sugar and lipid metabolism. Result. The highest successful rate (100%) was observed in rats treated with a single injection of 45 mg/kg STZ, but the plasma insulin level of this particular group was significantly decreased, and ISI has no difference compared to control group. The successful rate of 30 mg/kg STZ twice injection group was significantly high (85%) and the rats in this group presented a typical characteristic of T2DM as insulin res Continue reading >>
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Multiple Low Dose Streptozotocin-induced Diabetes In The Rat Causes Acute Upregulation Of Plasma Osteopontin (opn): Protective Role Of Opn In The Islets
Multiple Low Dose Streptozotocin-Induced Diabetes in the Rat Causes Acute Upregulation of Plasma Osteopontin (OPN): Protective Role of OPN in the Islets Osteopontin (OPN) is a secrete Osteopontin (OPN) is a secreted acidic phosphoprotein that binds to a cell surface integrin-binding motif and is involved in many inflammatory and immune-modulating disorders. In a rat diabetes model secondary to multiple injections of low-dose streptozotocin (MLDS) we examined the serum and pancreatic levels of OPN. OPN serum levels were increased 4-fold 24hr after the first dose of streptozotocin and increased 8-fold by day 6. Western blotting of the serum demonstrated an increase of the various soluble molecular weight forms of OPN. Variable patterns of OPN expression were seen in the pancreatic ducts and in islets. After MLDS the intensified OPN expression became more localized towards the periphery of the islets and surrounded the remaining insulin-positive cells. The enhanced OPN reactivity was not associated with accumulation of monocyte/macrophages until day 6. Addition of OPN protein to isolated islets [italic]in vitro[/italic] did not significantly reduce nitric oxide levels. Addition of IL-1[beta] to the islets significantly increased the constitutive expression of both OPN mRNA and OPN protein. Pretreatment of the islets with OPN decreased cytokine-induced nitric oxide production 4-fold, and significantly (P[le] 0.005) reduced induced nitric oxide synthase mRNA and protein levels. OPN prevented IL-1[beta]-mediated inhibition of glucose stimulated insulin secretion in rat islets in a dose-dependent manner. Our data suggest that the acute induction of OPN might represent an endogenous mechanism to protect the islets against cytokine-induced cytotoxicity. ANAND K. KATAKAM, JAGADE Continue reading >>
Hypoglycemic Effect Of Catalpol On High-fat Diet/streptozotocin-induced Diabetic Mice By Increasing Skeletal Muscle Mitochondrial Biogenesis
Hypoglycemic effect of catalpol on high-fat diet/streptozotocin-induced diabetic mice by increasing skeletal muscle mitochondrial biogenesis Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education Jiangsu Center for Pharmacodynamics Research and Evaluation Jiangsu Center for Pharmacodynamics Research and Evaluation Correspondence address. Tel: +86-25-83271043; Fax: + ; E-mail: [email protected] (T.W.)/ [email protected] (L.Z.) Search for other works by this author on: State Key Laboratory of Natural Medicines Correspondence address. Tel: +86-25-83271043; Fax: + ; E-mail: [email protected] (T.W.)/ [email protected] (L.Z.) Search for other works by this author on: Acta Biochimica et Biophysica Sinica, Volume 46, Issue 9, 1 September 2014, Pages 738748, Xia Li, Zhimeng Xu, Zhenzhou Jiang, Lixin Sun, Jinzi Ji, Jingshan Miao, Xueji Zhang, Xiaojie Li, Shan Huang, Tao Wang, Luyong Zhang; Hypoglycemic effect of catalpol on high-fat diet/streptozotocin-induced diabetic mice by increasing skeletal muscle mitochondrial biogenesis, Acta Biochimica et Biophysica Sinica, Volume 46, Issue 9, 1 September 2014, Pages 738748, Catalpol, an iridoid glycoside, exists in the root of Radix Rehmanniae. Some studies have shown that catalpol has a remarkable hypoglycemic effect in the streptozotocin-induced diabetic model, but the underlying mechanism for this effect has not been fully elucidated. Because mitochondrial dysfunction plays a vital role in the pathology of diabetes and because improving mitochondrial function may offer a new approach for the treatment of diabetes, this study was designed. Catalpol was orally administered together with metformin to high-fat diet/streptozotocin (HFD/STZ)-induced diabetic mice daily for 4 weeks. Body weight (BW), fast Continue reading >>
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Low-dose Streptozotocin-induced Diabetes In The Spontaneously Hypertensive Rat - Sciencedirect
Get rights and content Streptozotocin (STZ, 35 mg/kg body weight) was injected into spontaneously hypertensive rats (SHR) and Wistar-Kyoto (WKY) rats, and plasma glucose and triglyceride concentrations measured 10 days later. Neither mean (SEM) plasma glucose (130 3 v 136 3 mg/dL) nor triglyceride (93 6 v 108 7 mg/dL) concentrations increased in WKY rats. In contrast, both plasma glucose (141 3 v 262 36) and triglyceride (121 8 v 196 7 mg/dL) concentrations increased significantly (P < .01) following administration of STZ in SHR. Furthermore, when SHR previously injected with STZ were fed a diet enriched in fructose, they had a further increase (P < .01) in both plasma glucose (343 38 mg/dL) and triglyceride (774 57 mg/dL) concentrations. Plasma triglyceride concentration also increased significantly (P < .05) when STZ-injected WKY rats ingested the fructose-enriched diet, but plasma glucose levels still remained within the normal range (152 5 mg/dL). These results indicate that SHR were more sensitive to the effects of a decrease in pancreatic -cell function (STZ) and an increase in insulin resistance (fructose feeding) than WKY rats. Continue reading >>
High-fat Diet/low-dose Streptozotocin-induced Type 2 Diabetes In Rats Impacts Osteogenesis And Wnt Signaling In Bone Marrow Stromal Cells
High-Fat Diet/Low-Dose Streptozotocin-Induced Type 2 Diabetes in Rats Impacts Osteogenesis and Wnt Signaling in Bone Marrow Stromal Cells Contributed equally to this work with: Chao Qian, Chenyuan Zhu Affiliation: Department of Prosthodontics, School of Stomatology, Ninth Peoples Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology. Shanghai, 200011, Peoples Republic of China Contributed equally to this work with: Chao Qian, Chenyuan Zhu Affiliation: Department of Prosthodontics, School of Stomatology, Ninth Peoples Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology. Shanghai, 200011, Peoples Republic of China Affiliation: Department of Prosthodontics, School of Stomatology, Ninth Peoples Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology. Shanghai, 200011, Peoples Republic of China * E-mail: [email protected] (FZ); [email protected] (XJ) Affiliation: Department of Prosthodontics, School of Stomatology, Ninth Peoples Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology. Shanghai, 200011, Peoples Republic of China These authors also contributed equally to this work. * E-mail: [email protected] (FZ); [email protected] (XJ) Affiliation: Department of Prosthodontics, School of Stomatology, Ninth Peoples Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology. Shanghai, 200011, Peoples Republic of China These authors also contributed equally to this work. Bone regeneration disorders are a significant problem in patients with type 2 diabetes mellitus. Bone marrow stromal cells (BMSCs) are recognized as ideal seed cells for tissue engineerin Continue reading >>
Induction Of Diabetes By Streptozotocin In Rats
Induction of diabetes by Streptozotocin in rats 2Biometric Researcher, S.P. I. Institute, Karaj, Iran 3Biochemistry department of Alzahra University, Tehran, Iran 1Department of Pilot Biotechnology of Pasteur Institute of Iran, 69-pasteur, Ave, 13164 Tehran, Iran A. Akbarzadeh, Email: [email protected] . Copyright Association of Clinical BIochemists of India 2007 This article has been cited by other articles in PMC. The objective of this study is to induce experimental diabetes mellitus by Streptozotocin in normal adult Wistar rats via comparison of changes in body weight, consumption of food and water, volume of urine and levels of glucose, insulin and C-peptide in serum, between normal and diabetic rats. Intra-venous injection of 60mg/kg dose of Streptozotocin in adult wistar rats, makes pancreas swell and at last causes degeneration in Langerhans islet beta cells and induces experimental diabetes mellitus in the 24 days. Induction of experimental diabetes mellitus is indeed the first step in the plan of purification of pancreatic Langerhans islet cells of normal rats for transplanting under the testis subcutaneous of experimentally induced diabetic rats. Streptozotocin induces one type of diabetes which is similar to diabetes mellitus with non-ketosis hyperglycemia in some animal species. For induction of experimental diabetes in male adult rats weighted 250300 grams (7590 days), 60mg/kg of Streptozotocin was injected intravenously. Three days after degeneration of beta cells, diabetes was induced in all animals. The diabetic and normal animals were kept in the metabolic cages separately and their body weight, consumption of food and water, urine volume, the levels of serum glucose, insulin and C-peptide quantities in all animals were measured and then th Continue reading >>
Single Dose Streptozotocin Induced Diabetes: Considerations For Study Design In Islet Transplantation Models
Single Dose Streptozotocin Induced Diabetes: Considerations for Study Design in Islet Transplantation Models We are experimenting with display styles that make it easier to read articles in PMC. The ePub format uses eBook readers, which have several "ease of reading" features already built in. The ePub format is best viewed in the iBooks reader. You may notice problems with the display of certain parts of an article in other eReaders. Generating an ePub file may take a long time, please be patient. Single Dose Streptozotocin Induced Diabetes: Considerations for Study Design in Islet Transplantation Models MC Deeds, JM Anderson, [...], and YC Kudva Streptozotocin (STZ)-induced diabetes mellitus (DM) offers a very cost effective and expeditious technique that can be used in most strains of rodents, opening the field of DM research to an array of genotypic and phenotypic options that would otherwise be inaccessible. Despite widespread use of STZ in small animal models, the data available concerning drug preparation, dosing and administration, time to onset and severity of DM, and any resulting moribundity and mortality are often limited and inconsistent. Because of this, investigators inexperienced with STZ-induced diabetes may find it difficult to precisely design new studies with this potentially toxic chemical and account for the severity of DM it is capable of inducing. Until a better option becomes available, attempts need to be made to address shortcomings with current STZ-induced DM models. In this paper we review the literature and provide data from our pancreatic islet transplantation experiments using single high dose STZ-induced DM in NCr Athymic Nude mice with hopes of providing clarification for study design, suggesting refinements to the process, and develop Continue reading >>
Guidelines On Use Of Streptozotocin In Rodents
Guidelines on Use of Streptozotocin in Rodents To describe the appropriate use of streptozotocin for induction of diabetes mellitus (DM) in rats and mice and associated husbandry procedures To describe the appropriate post-injection monitoring of rodents Investigators using STZ to induce diabetes in rodents Streptozotocin (STZ): An antitumor/antibiotic compound isolated from Streptomyces achromogenes with potent toxicity to beta islet cells of the pancreas Carcinogen: An agent capable of causing cancer Teratogen: An agent capable of causing developmental abnormalities Cytotoxic: Possessing ability to exert toxic effects on a cell Depending on the dose and dose frequency, STZ can be used to induce insulin-dependent Type 1 DM or non insulin-dependent Type 2 DM. Known to cause hepatic and renal toxicity in mice and rats. Due to toxic effects and disease progression, some animal mortality can occur. However, steps to reduce mortality must be taken. Is a carcinogen, teratogen, and has been shown to affect fertility in animal studies. Effect on different strains is variable. ULAM recommends starting at the lower end of the dose ranges until performance for a given strain can be established. Increased appetite, defecation, thirst, and urination Appropriate availability of water must be ensured (e.g., if water bottles are being supplied, consider providing two bottles). Cage change frequency may need to be increased to account for increased urination . Recommended doses vary considerably due to strain, age, and weight differences in susceptibility to STZ, as well as variation in the bioactivity of the STZ itself. A general range for use is 42-65 mg/kg administered intraperitoneally (IP). The compound may also be administered intravenously (IV) or by other less common routes. A Continue reading >>
Spontaneous Glucose Intolerance In The Progeny Of Low Dose Streptozotocin-induced Diabetic Mice
, Volume 36, Issue12 , pp 12451251 | Cite as Spontaneous glucose intolerance in the progeny of low dose streptozotocin-induced diabetic mice Multiple low doses of streptozotocin (LDS) induce low-incidence diabetes mellitus in Balb/cHan and high-incidence diabetes in CD-1 mice. We studied offspring of diabetic parents in both strains. Group 1 consisted of litters from control mice with no streptozotocin treatment. Group 2 litters had an LDS diabetic mother and a control father, group 3 litters had control mother with LDS diabetic father, and group 4 litters had both, LDS diabetic mother and father. Diabetes was induced by 540 mg streptozotocin per kg on five consecutive days. Progeny of diabetic mothers showed a state of reduced glucose tolerance associated with reduced glucose disappearance during intravenous glucose tolerance test and increased insulin secretion of isolated islets of Langerhans. These metabolic abnormalities predominated in the male litters of both strains of mice. Amniotic insulin was increased in diabetic mothers during pregnancy. No histologic abnormalities were observed in group 2 progeny. Pancreases in male offspring of LDS diabetic CD-1 fathers (group 3) were studied for insulitis. Insulitis was found in 40% of mice with normal glucose tolerance. A single subdiabetogenic dose of streptozotocin (40 mg/kg) induced insulitis in 90% of pancreases accompanied by reduced insulin release of isolated islets. By contrast, male Balb/cHan progeny of diabetic fathers failed to develop insulitis. In conclusion, we found (1) parental LDS diabetes was transmitted more often to male offspring, (2) maternal LDS diabetes was associated with hyperinsulin secretion and glucose intolerance in the offspring and (3) paternal LDS diabetes was accompanied by insulitis a Continue reading >>
Stz Frequently Asked Questions
Streptozotocin (STZ) is an alkylating agent that affects pancreatic islets, inducing diabetes in mice. The males of various strains are differentially susceptible to developing diabetes: FVB/NJ (001800), BALB/cJ (000651), and A/J (000646) males are resistant; C57BL/6J (000664) males are moderately susceptible; and NOD/ShiLtJ (001976) and CBA/J (000656) males are highly susceptible. NOD-congenic strains like NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ (NSG; 005557) and NOD.CB17-Prkdcsci/J (NOD scid; 001303) are also highly susceptible. We have developed a multiple low dose STZ protocol that induces diabetes in C57BL/6J, NSG and NOD scid males. What is the JAX protocol for STZ-induced diabetes? Six- to eight-week old C57BL/6J (000664, B6) or NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ (005557,NSG) or NOD.CB17-Prkdcscid/JNOD scid ( 001303, NOD scid) males are individually marked, weighed, and their baseline blood glucose levels determined ((OneTouch Ultra monitor) Mice receive daily IP injections of 50 mg STZ/kg body weight (the most effective dose for B6 males) or 40 mg STZ/kg body weight (for NSG males) for five consecutive days; age-matched controls receive bufferonly injections Because mice metabolize STZ for at least 24 hours post-injection, they are housed in disposable cages with appropriate absorbent bedding and food and water ad libitum At least 24-hours after the final injection, all mice are moved to clean cages, weighed, and their blood glucose levels determined The mice are observed daily until 14-16 days post injection, when they are weighed and their blood glucose levels determined (at this time, pancreatic beta-islet cells are totally absent or severely depleted) Blood glucose level and body weight data for individual mice are shipped with the mice How soon and late after being Continue reading >>
