Long-term function of isotransplanted islets of Langerhans in the diabetic rat

1976 ◽  
Vol 54 (6) ◽  
pp. 916-925 ◽  
Author(s):  
E. J. Greenglass ◽  
J. M. Martin
Keyword(s):  
Insulin Secretion ◽  
Diabetic Rats ◽  
Male Rats ◽  
Diabetic Rat ◽  
Oral Glucose ◽  
Oral Glucose Tolerance ◽  
Experimental Animals ◽  
Functional Development ◽  
Experimental Group

Highly inbred male rats were made diabetic by subtotal pancreatectomy. After diabetes developed, the animals were transplanted with an average of 500 isolated islets, obtained from donors of the same sex and strain, into the portal vein. Groups of islet-transplanted diabetic rats were followed for periods of 3, 6, and 14 months, during which time the performance of the transplanted islets was investigated. Control animals were followed for similar periods of time. The findings obtained from each experimental group were integrated so as to provide a continuous picture of the transplanted islet's behaviour from 2 weeks to 14 months post transplantation.To assess islet performance, normal, untreated diabetic, and transplanted animals were subjected to three stimulatory tests of insulin secretion: (1) oral glucose tolerance, (2) intravenous sulfonylurea, and (3) intraperitoneal L-arginine. Normal and transplanted rats were additionally subjected to one inhibitory test of insulin secretion, diazoxide (given orally). At the end of the study, control and experimental animals were killed, and morphological investigations were performed on liver and pancreas.Isotransplantation of islets in partially depancreatized diabetic rats resulted in the reversal of the condition. The transplanted islets were found to respond to physiologic and pharmacologic controls, although the characteristics of the responses were not identical with that of the normal intact islet. The results of this study have suggested that a functional development of the transplanted islets occurs.

scholarly journals Meal feeding improves oral glucose tolerance in male rats and causes adaptations in postprandial islet hormone secretion that are independent of plasma incretins or glycemia

2014 ◽  
Vol 307 (9) ◽  
pp. E784-E792 ◽  
Author(s):  
Torsten P. ◽  
Benedikt A. Aulinger ◽  
Eric P. Smith ◽  
Deborah L. Drazen ◽  
Yve Ulrich-Lai ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Glucose Tolerance ◽  
Cell Function ◽  
Hormone Secretion ◽  
Insulin Response ◽  
Male Rats ◽  
Oral Glucose ◽  
Light Cycle ◽  
Oral Glucose Tolerance ◽  
Islet Hormone

Meal-fed (MF) rats with access to food for only 4 consecutive hours during the light cycle learn to eat large meals to maintain energy balance. MF animals develop behavioral and endocrine changes that permit glucose tolerance despite increased meal size. We hypothesized that enhanced activity of the enteroinsular axis mediates glucose homeostasis during MF. Cohorts of rats were allocated to MF or ad libitum (AL) regimens for 2–4 wk. Insulin secretion and glucose tolerance were determined after oral carbohydrate and intraperitoneal (ip) and intravenous (iv) glucose. MF rats ate less than AL in the first week but maintained a comparable weight trajectory thereafter. MF rats had decreased glucose excursions after a liquid mixed meal (AUC: MF 75 ± 7, AL 461 ± 28 mmol·l−1·min, P < 0.001), with left-shifted insulin secretion (AUC0–15: MF 31.0 ± 4.9, AL 9.6 ± 4.4 pM·min, P < 0.02), which peaked before a significant rise in blood glucose. Both groups had comparable fasting glucagon levels, but postprandial responses were lower with MF. However, neither intestinal expression of proGIP and proglucagon mRNA nor plasma incretin levels differed between MF and AL groups. There were no differences in the insulin response to ip or iv glucose between MF and AL rats. These findings demonstrate that MF improves oral glucose tolerance and is associated with significant changes in postprandial islet hormone secretion. Because MF enhanced β-cell function during oral but not parenteral carbohydrate administration, and was not accounted for by changes in circulating incretins, these results support a neural mechanism of adaptive insulin secretion.

scholarly journals Long-term Effect of Water Pollutants (Heavy Metals) on the Morphofunctional State of the Adult Rat's Pituitary Gland

2021 ◽  
Vol 6 (4) ◽  
pp. 172-178
Author(s):  
N. B. Hryntsova ◽  
◽  
A. M. Romanyuk
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Pituitary Gland ◽  
Adult Male ◽  
The Body ◽  
Male Rats ◽  
Structural Components ◽  
Experimental Animals ◽  
Experimental Group

In some northern regions of Ukraine there is an increased accumulation of salts of heavy metals in soil and drinking water, which negatively affect the health of the population and become a risk factor for many diseases. The role of the pituitary gland in the regulation of functional disorders of hormonal homeostasis in various pathological conditions is extremely important. The purpose of the study is to study the morphological, morphometric and biochemical rearrangements of the structural components of the adenohypophysis of adult male rats under conditions of long-term exposure to salts of heavy metals. Materials and methods. The experiment was performed on 24 white adult male rats, which were divided into 1 control and 1 experimental group. The experimental group consisted of rats, which for 90 days consumed ordinary drinking water, saturated with a combination of salts of heavy metals: zinc (ZnSO4 · 7H2O) – 5 mg/l, copper (CuSO4 · 5H2O) – 1 mg/l, iron (FeSO4) – 10 mg/l, manganese (MnSO4 · 5H2O) – 0.1 mg/l, lead (Pb (NO3) 2) – 0.1 mg/l and chromium (K2Cr2O7) – 0.1 mg/l. Results and discussion. Long-term effects on the body of experimental animals of salts of heavy metals caused a pronounced compensatory-adaptive changes in the pituitary gland of experimental animals of hypoxic nature. Morphological changes in the organ were accompanied by plethora of venous bed, deterioration of rheological properties of blood, increase in the area of connective tissue component of the gland, violation of histoarchitectonics of epithelial trabeculae, edema in the parenchyma, increase in linear indicators of the pituitary gland. Toxic effects of salts of heavy metals negatively affected the cellular composition of the adenohypophysis: there was an increase in the number of chromophobes and a decrease in the number of chromophilic acidophiles and basophils compared with control animals. At the same time, the increase in linear parameters, area of nuclei and cytoplasm of adenocytes can be attributed both to their compensatory hypertrophy and due to edema processes in the gland caused by deepening hypoxic effects and impaired blood flow from the organ as a result of venous plethora. Conclusion. Morphometric and biochemical parameters of the structural components of the anterior lobe of the adenohypophysis at 90 days of exposure to salts of heavy metals, of course, indicate a significant stress of adaptive processes by the adenohypophysis in response to stressors (salts of heavy metals)

Antidiabetic Effect of Aqueous Corrigiola telephiifolia in Streptozotocin- Induced Diabetic Rats

2020 ◽  
Vol 10 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Morad Hebi ◽  
Mohamed Eddouks
Keyword(s):  
Blood Glucose ◽  
Glucose Tolerance Test ◽  
Tolerance Test ◽  
Diabetic Rats ◽  
Oral Glucose ◽  
Oral Glucose Tolerance ◽  
Phytochemical Screening ◽  
Antidiabetic Effect ◽  
Glucose Levels ◽  
Blood Glucose Levels

Background: Corrigiola telephiifolia Pourr, is a perennial species, woody distributed throughout the north of Africa. This plant is used in traditional Mediterranean preparations and has many traditional uses especially treatment of diabetes. Aim/Methods: The current research was carried out to evaluate the antidiabetic effect of Aerial Parts of Aqueous Extract (APAE) of Corrigiola telephiifolia (C. telephiifolia) on both normal and streptozotocin (STZ)-induced diabetic rats treated at a dose of 5 mg/kg for fifteen days. Additionally, the histopathological changes in the liver, morphometric analysis, Oral Glucose Tolerance Test (OGTT) in normal rats and preliminary phytochemical screening for various components were realized. Results: Single oral administration of the APAE of C. telephiifolia (5mg/kg) showed no significant change in glycaemia of normal and STZ-induced diabetic rats. In contrast, repeated oral administration of C. telephiifolia reduced blood glucose levels from 4.11 ± 0.10 mmol/L to 3.16 ± 0.16 mmol/L (p<0.01) 15 days after administration in normal rats. Furthermore, blood glucose levels decreased from 17.84 ± 1.75mmol/L to 1.93 ± 0.33 mmol/L (p<0.0001) in STZ diabetic rats after fifteen days of treatment. According to the oral glucose tolerance test, C. telephiifolia (5 mg/kg) was shown to prevent significantly the increase in blood glucose levels in normal treated rats 30 min after glucose administration when compared to the control group. Also, the liver architecture of diabetic rats treated by C. telephiifolia was improved when compared with the liver architecture of untreated diabetic rats. Concerning the preliminary phytochemical screening of C. telephiifolia, several compounds have been found such as polyphenols, flavonoids, saponins, mucilage and terpenoids. Conclusion: The results show that the aqueous extract of C. telephiifolia possesses significant antihyperglycemic activity.

Effect of chronic intraperitoneal aminoguanidine on memory and expression of Bcl-2 family genes in diabetic rats

2016 ◽  
Vol 94 (6) ◽  
pp. 669-675 ◽  
Author(s):  
Mohsen Alipour ◽  
Fatemeh Adineh ◽  
Hossein Mosatafavi ◽  
Azam Aminabadi ◽  
Hananeh Monirinasab ◽  
...  
Keyword(s):  
Diabetic Rats ◽  
Male Rats ◽  
Cognitive Tasks ◽  
Negative Effects ◽  
Gene Expressions ◽  
Family Gene ◽  
Higher Doses ◽  
With Memory ◽  
Hippocampal Apoptosis

Long-term hyperglycemia associates with memory defects via hippocampal cells damaging. The aim of the present study was to examine the effect of 1 month of i.p. injections of AG on passive avoidance learning (PAL) and hippocampal apoptosis in rat. Eighty male rats were divided into 10 groups: control, nondiabetics and STZ-induced diabetics treated with AG (50, 100, 200, and 400 mg/kg, i.p.). PAL and the Bcl-2 family gene expressions were determined. Diabetes resulted in memory and Bcl-2 family gene expression deficits. AG (50 and 100 mg/kg) significantly improved the learning and Bcl-2, Bcl-xl, Bax, and Bak impairment in diabetic rats. However, negative effects were indicated by higher doses of the drug (200 and 400 mg/kg). Present study suggests that 1 month of i.p. injections of lower doses of AG, may improve the impaired cognitive tasks in STZ-induced diabetic rats possibly by modulating Bcl-2 family gene expressions.

scholarly journals Pharmacological potential of methanol extract of Anacardium occidentale stem bark on alloxan-induced diabetic rats

2018 ◽  
Vol 5 (7) ◽  
pp. 2440-2454
Author(s):  
D. A. Omoboyowa ◽  
F. O. Afolabi ◽  
T. C. Aribigbola
Keyword(s):  
Blood Glucose ◽  
Glucose Tolerance ◽  
Glucose Tolerance Test ◽  
Methanol Extract ◽  
Stem Bark ◽  
Tolerance Test ◽  
Diabetic Rats ◽  
Oral Glucose ◽  
Oral Glucose Tolerance ◽  
Β Cells

Background: The anti-hyperglycemic potential of methanol stem bark extract of Anacardium occidentale (MSBEAO) was investigated using an alloxan-induced diabetic rat model. Alloxan administration induces the generation of free radicals which can affect antioxidant status resulting in the disruption of the β-cells of the pancreas. Therefore, this study examines the antioxidant potential of the plant extract and the ameliorating effect on the pancreas of alloxan-induced diabetic rats. Methods: Diabetes was induced by intraperitoneal injection of 150 mg/kg body weight of alloxan monohydrate. MSBEAO, at a concentration of 100 or 200 mg/kg b.w. was orally administered to alloxan-induced diabetic rats and normal rats. The hypoglycemic effect, oral glucose tolerance test, and biochemical assay of alloxan-induced diabetic rats were assayed using standard procedures. Results: Preliminary phytochemical screening of the extract revealed the presence of alkaloids, tannins, saponins, terpenoids, carbohydrates, and phenols at moderate concentrations. The lethality dose (LD50) of the plant extract was found to be equal to or less than 5000 mg/kg b.w. The hypoglycemic effect of the extract on the non-diabetic rats revealed a significant (p<0.05) decrease in the blood glucose concentration of animals administered with 1 g/kg b.w. of the extract, compared to normal control rats administered with normal saline. In the oral glucose tolerance test, the methanol extract exerted the highest response, similar to glibenclamide after 15 and 30 minutes of administration, compared to the control rats. The methanol extract yielded the highest blood glucose lowering effects after 9 days of treatment (p<0.05), compared to diabetic rats administered with normal saline and 0.3 mg/kg b.w. of glibenclamide. Administration of the extract at 200 mg/kg b.w. showed improved pancreas architecture and regeneration of the β-cells, compared with the pancreas of animals in the other groups. Conclusion: The results of this study suggest that MSBEAO is a potentially effective agent for the management of diabetes which might result from the antioxidant-generating capacity of the stem bark.

scholarly journals Acute Toxicity and Hypoglycemic Effect of a Polyherbal Formulation on Blood Glucose in Oral Glucose Tolerance Test (OGTT) and Alloxan-Induced Diabetic Rats

2021 ◽  
Vol 10 (2) ◽  
pp. 111-115
Author(s):  
Abednego Okeoghene Warri ◽  
Emuesiri Goodies Moke ◽  
Aishat Oyinkansola Balogun ◽  
Kennedy Chibogu Nzeh ◽  
Emuesiri Kohworho Umukoro ◽  
...  
Keyword(s):  
Blood Glucose ◽  
Acute Toxicity ◽  
Glucose Level ◽  
Glucose Tolerance Test ◽  
Tolerance Test ◽  
Diabetic Rats ◽  
Oral Glucose ◽  
Oral Glucose Tolerance ◽  
Polyherbal Formulation ◽  
Herbal Formulation

Madam F. Kayes Bitters® is an herbal formulation commonly used in Nigeria and some African countries in the management of diabetes mellitus and other diseases conditions. This study evaluated the in-vivo hypoglycaemic activity, as well as acute toxicity of the polyherbal formulation to provide its efficacy and safety. Healthy albino mice (20-30 g) and Sprague Dawley female rats (90-130 g) were used for this study. Acute toxicity study (LD50) of the herbal formulation was determined by methods originally described by Miller and Tainter in 1994. Following oral dosing with glucose (2 g/kg) in normal fasted animals, herbal formulation (HF) at various doses was administered and blood glucose levels at 30 minutes, 60 minutes, 90 minutes, and 120 minutes were taken and recorded. Diabetes was induced using alloxan 150 mg/kg and diabetic rats were given the HF at doses of 50, 100, and 200 mg/kg with glibenclamide 2.5 mg/kg used as standard drug treatment. Blood glucose level was determined on 1st day, 7th day, 14th and 21st day. The LD50 was greater than 5g/kg with oral administration. The oral glucose tolerance test showed that the group that received 100 mg/kg HF showed a significant reduction (p<0.05) in glucose level after 120 minutes when compared to the basal level of glucose recorded. All treated diabetic groups showed a significant decrease in glucose level on the 21st day. The herbal formulation of Hydrastis canadesis Aloe capensis, Echinacea angustifolia and honey exhibited a significant glucose-lowering activity in alloxan-induced diabetic rats.

scholarly journals Impact of Ellagic Acid in Bone Formation after Tooth Extraction: An Experimental Study on Diabetic Rats

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Mazen M. Jamil Al-Obaidi ◽  
Fouad Hussain Al-Bayaty ◽  
Rami Al Batran ◽  
Jamal Hussaini ◽  
Goot Heah Khor
Keyword(s):  
Normal Saline ◽  
Ellagic Acid ◽  
Tooth Extraction ◽  
Healing Process ◽  
Diabetic Rats ◽  
Male Rats ◽  
Diabetic Rat ◽  
Control Group ◽  
Tooth Socket ◽  
The Impact

Objectives. To estimate the impact of ellagic acid (EA) towards healing tooth socket in diabetic animals, after tooth extraction.Methods. Twenty-fourSprague Dawleymale rats weighing 250–300 g were selected for this study. All animals were intraperitoneally injected with 45 mg/kg (b.w.) of freshly prepared streptozotocin (STZ), to induce diabetic mellitus. Then, the animals were anesthetized, and the upper left central incisor was extracted and the whole extracted sockets were filled with Rosuvastatin (RSV). The rats were separated into three groups, comprising 8 rats each. The first group was considered as normal control group and orally treated with normal saline. The second group was regarded as diabetic control group and orally treated with normal saline, whereas the third group comprised diabetic rats, administrated with EA (50 mg/kg) orally. The maxilla tissue stained by eosin and hematoxylin (H&E) was used for histological examinations and immunohistochemical technique. Fibroblast growth factor (FGF-2) and alkaline phosphatase (ALP) were used to evaluate the healing process in the extracted tooth socket by immunohistochemistry test.Results. The reactions of immunohistochemistry for FGF-2 and ALP presented stronger expression, predominantly in EA treated diabetic rat, than the untreated diabetic rat.Conclusion. These findings suggest that the administration of EA combined with RSV may have accelerated the healing process of the tooth socket of diabetic rats, after tooth extraction.

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