جستجوی مقالات مرتبط با کلیدواژه "fibroblast growth factor" در نشریات گروه "پزشکی"

This research examined the connection between circulating FGF21 and clinicopathological findings in papillary thyroid carcinoma.

This analytical cross-sectional research was conducted on patients with papillary thyroid cancer at the Seyyed Shirazi Endocrinology Clinic in Gorgan, Iran. Laboratory data, including demographics, ultrasonography and pathology reports, and FGF21 levels, were collected. The data was analyzed with SPSS 25. Normal distribution was evaluated by using Kolmogorov-Smirnov and Shapiro-Wilk tests. Group differences were evaluated with Chi-square, independent sample t-test and Mann-Whitney U tests. A p-value less than 0.05 was considered significant.

In this research, 83% of patients were female, and the mean±SD age was 42.51±13.28 years old. The mean±SD and FGF21 concentrations in 49 patients were 716.41±458.7, the median was 489 pg/ml, and 24 (49%) patients were in the high FGF21 group. There was no statistically significant relation between FGF21 level and age (P=0.95), sex (P=>0.99), tumor size (P=0.68), tumor stage (P=>0.99), lymphadenopathy (P=>0.99), lymph node metastasis (P=0.24), triglycerides (P=0.93), total cholesterol (P=0.47), LDL (P=0.08), and HDL (P=0.08). However, FGF21 levels were significantly associated with fasting blood glucose (P=0.03), body mass index (BMI) (P=<0.0001), capsular invasion (P=0.001), lymphovascular involvement (P=0.0001) and Thyroid Imaging Reporting and Data System (TIRADS) score (P=0.02). In addition, high levels of FGF21 were found to be 78.95% sensitive and 70% specific for capsular invasion.

Our study demonstrated that FGF21 is associated with more severe papillary thyroid cancer clinicopathological features such as capsular invasion, lymphovascular involvement, TIRADS score, and BMI.

Tendon recovery after a surgical operation or traumatic injury is still one of the challenges of rehabilitation. Many recently formulated treatments have been designed to improve these procedures. This study aimed to evaluate the effects of recombinant basic fibroblast growth factor (bFGF) and cold atmospheric plasma (CAP) on calcaneus tendon healing and regeneration in rabbit models.

This study subdivided 40 mature male New Zealand white rabbits into four groups (n=10 in each). The defect was made under general conditions, and the wound was closed without treatment. The experimental groups included sham (without treatment), bFGF (operated bFGF in the injured area), CAP (used CAP in the injured area), and bFGF/CAP (used both CAP and bFGF) in the injured area. This study used trichrome and reticulin stains to evaluate collagen production and other tissue factors. Also, hydroxyproline levels were measured for better observation of collagen synthesis. Pathological evaluation of the defective tendon was performed on days 60 and 120 after surgery.

The improvement of new and parallel tendon formation was the best in the bFGF/CAP group at both times, especially 120 days after surgery. An increase in hydroxyproline levels was also seen on the sampling days.

The experiment showed that bFGF/CAP combination significantly improved tendon remodeling in the injured areas.

Basic fibroblast growth factor (bFGF) is an effective cytokine in angiogenesis and bone remodeling. The aim of this study was to determine the effect of locally injected bFGF on movement rate and root resorption during orthodontic force application in dogs.

In this experimental animal study, four 10-12 months male dogs were selected and were randomly allocated into two groups. A week following insertion of closing coil spring between the canines and second premolars, 50µg of bFGF was injected to the case group and phosphate saline to the control group once per month. One month after second injection, the distance between the mentioned teeth were measured. Also, root resorption percentage were analyzed on the second premolars.

Average maxillary tooth movement rate in case and control groups were found 2.53 and 1.35mm/month respectively. The correspondent mandibular measures were 2.23mm and 1.15mm. These differences were statistically significant (P<0.0001). In respect to root resorption, the differences were found statistically significant (P<0.01) for coronal region in maxilla, which was higher in control group. Regarding the apical and middle regions of both jaws as well as coronal region of mandible the differences were insignificant.

The results of the study showed that the local injection of bFGF can increase tooth movement rate and has the potential to decrease root resorption during orthodontic tooth movement in dogs.

Fibroblast growth factor 21 (FGF21) is a myokine which is produced and secreted by skeletal muscle. Given the inconsistent results on the relationship between the intensity of training and the improvement of blood indices in diabetic patients, the current research investigated the effect of endurance training at different intensities on serum FGF21 level, glucose, and insulin resistance
in streptozotocin (STZ)-diabetic male rats.

To this end, 50 rats (with a mean weight of 23.28±25.05 g) were randomly divided into healthy (non-diabetic) control, diabetic control, as well as low, moderate, and high-intensity endurance training groups. Diabetes was induced in all rats by the injection of STZ. Three days after STZ injection, the blood samples were taken from the cut tip of the tails, and those rats with blood glucose levels above 300 mg/dL were considered diabetic and included in the study. The program included 8-week aerobic training at different intensities. The blood samples (5 cc) were directly collected from the hearts 48 hours after the last training session, followed by measuring the serum FGF21 level, glucose, and insulin. Finally, the analysis of variance and Bonferroni post-hoc test were used for inter-group comparison and the significance level was considered <0.05.

Based on the results, the serum glucose level, insulin resistance, and FGF21 reduced after eight weeks of endurance training. The reduction of FGF21 in higher intensity endurance training group was greater compared to the other groups (P<0.05) and the reduction of glucose in moderate intensity group was more significant in comparison to that of the other groups (P<0.001). However, the insulin level increased, which was more pronounced in the moderate intensity training group compared to the other groups (P=0.002).

Overall, both moderate and high-intensity endurance training led to a comparatively more effective reduction in blood glucose and insulin resistance. Therefore, these two parameters may have a protective effect on the complications associated with diabetes in the rats.

Fibroblast growth factor receptor 2b (FGFR2b) plays a crucial role in cell signaling pathway, regulating several key biological processes, including cellular differentiation and proliferation. Different types of cancers, including breast cancer, have also been associated with various genetic alterations in the kinase domain of FGFR2b. The present study was conducted to shed new light on a possible mechanism, by which flavonoids alter FGF cell signaling. Recombinant pLEICS-01 expression vectors containing the gene encoding the FGFR2b kinase domain were transformed to E. coli BL21 (DE3). Expression of the recombinant protein was then induced with IPTG. Next, the protein was purified by affinity chromatography. The recombinant protein functionality was assessed using PAGE, by analyzing interactions of the protein with the wild type and the mutant SH2 domains of phospholipase C-γ (PLC-γ). Finally, stability and structural changes of the kinase domain were studied upon interaction with gallic acid, naringenin, quercetin and catechin. The PAGE analysis clearly demonstrated that the recombinant protein interacts only with the wild type SH2 domains of PLC-γ, suggesting the kinase domain is functional. The results also showed that presence of the flavonoids cause a red-shift in the intrinsic fluorescence emission spectra of the kinase domain, suggesting a change in the overall structure of the kinase domain. Further structural studies, using a comprehensive step chemical denaturation analysis, conspicuously showed that the presence of the flavonoids significantly changed the tertiary structure of the kinase domain. The comprehensive structural analyses revealed that the flavonoids significantly impinge on the tertiary structure of the kinase domain thereby suppressing fibroblast growth factor signaling.

Human adipose tissue-derived stem cells (hASCs) are considered as an attractive source of regenerative stem cells, mainly because of their higher proliferation rate, more accessibility and hepatocyte like properties as compared to mesenchymal stem cells isolated from other tissues. Numerous studies have described the beneficial use of adipose tissue-derived stem cells for generating hepatocyte-like cells. However, due to the lack of appropriate culture conditions, most of the produced cells exhibit poor functionality. The aim of the present study was to establish a new protocol for the efficient hepatic differentiation of hASCs. hASCs were cultured in hepatic differentiation medium containing fibroblast growth factor 4, hepatocyte growth factor, dexamethasone and oncostatin M using a three-step protocol up to 21 days. Then, the functionality of the treated cells was evaluated by analyzing specific hepatocyte genes and biochemical markers at various time points. A significant upregulation in albumin, alpha-fetoprotein, cytokeratin 18 and hepatocyte nuclear factor-4α expressions was observed in differentiated cells relative to day 1 of differentiation protocol. Moreover, the finding of glycogen deposits increased urea production and positive immunofluorescence staining for albumin and alpha-fetoprotein in hepatocyte-like cells suggesting that most of the cells differentiate into hepatocyte-like cells. Our report has provided a simple protocol for differentiation of hASCs into more functional hepatocyte-like cells.

Tendon injuries are common and it takes a long time for an injured tendon to heal. Adverse phenomena such as adhesion and rupture are associated with these injuries. Finding a method to reduce the time required for healing whichimproves the final outcome, will lead to decreased frequency and intensity of adverse consequences. This study was designed to investigate the effects of basic fibroblast growth factor on the healing of the Achilles tendon in rabbits
In 10 New Zealand white rabbits, Achilles tendon was cut at the intersection of the distal and middle thirds on both hind legs. One microgram of recombinant basic fibroblast growth factor (bFGF) was injected in the proximal and distal stumps of the cut tendon on the right side (study group). Normal saline of equal volume was injected on the left side in the same way (control group). Then the tendons were repaired with 5/0 nylon using modified Kessler technique. A cast was made to immobilize each leg. On day 42, rabbits were euthanized and both hind legs were amputated. Tensometry and histopathologic examination were done on specimens.
In tensometric studies, more force was required to rupture the repair site in study group. In histopathologic examination, collagen fibers had significantly better orientation and organization in the study group. No difference was noted regarding number of fibroblast and fibrocytes, and degree of angiogenesis in the two groups.
Application of basic fibroblast growth factor at tendon repair site improves the healing process through improvement of collagen fiber orientation and increase in biomechanical resistance.

Complete revascularization is not possible in up to 37% of patients with coronary artery disease (CAD). Therapeutic angiogenesis may be considered as an option in the management of these patients. The aim of the present study was to evaluate the effectiveness and safety of therapeutic angiogenesis using basic fibroblast growth factor in patients with CAD.
In this double-blind, placebo-controlled study, eighteen patients with a severe diffuse atherosclerotic disease along the left anterior descending (LAD) artery who were a CABG candidate with at least one graftable coronary artery and the presence of ischemia and viable areas along the LAD were enrolled. The patients were randomized into two groups to either undergo CABG and simultaneous FGF-2 therapy (bFGF group) or CABG without FGF-2 therapy (control group). During the CABG procedure in bFGF group, FGF-2/alginate-heparin-sepharose microcapsules, each contains 100 mcg FGF-2, were implanted in the subepicardial layer of the diffusely defective LAD territory via 2-3 mm stab incisions. Seven patients in each group were followed up for a period of 24 months.
Findings: The result of left ventricular evaluation with echocardiography and perfusion scans showed significant improvement in FGF-2-receiving group with no significant change in controls, 3 and 6 months after the intervention. NYHA class was significantly lower in the intervention group (1.43±0.535 vs. 2.57±.535, P = 0.002), In addition, intervention group remained free of angina 24 months after the intervention while three patients in the control group were hospitalized due to the acute chest pain.
Our study revealed that FGF-2 can improve the outcomes of patients with CAD undergoing CABG, without serious adverse effects. Considering other advantages associated with protein therapy our finding may help open novel avenues to safe and cost-effective therapy of the target patients.

Umbilical cord blood is a good source of the mesenchymal stem cells that can be banked, expanded and used in regenerative medicine. The objective of this study was to test whether amniotic membrane extract, as a rich source of growth factors such as basic-fibroblast growth factor, can promote the proliferation potential of the umbilical cord mesenchymal stem cells. The study design was interventional. Umbilical cord mesenchymal stem cells were isolated from voluntary healthy infants from hospitals in Shiraz, Iran, cultured in the presence of basic-fibroblast growth factor and amniotic membrane extracts (from pooled - samples), and compared with control cultures. Proliferation assay was performed and duplication number and time were calculated. The expression of stem cell’s specific markers and the differentiation capacity toward osteogenic and adipogenic lineages were evaluated. Amniotic membrane extract led to a significant increase in the proliferation rate and duplication number and a decrease in the duplication time without any change in the cell morphology. Both amniotic membrane extract and basic-fibroblast growth factor altered the expressing of CD44 and CD105 in cell population. Treating basic-fibroblast growth factor but not the amniotic membrane extract favored the differentiation potential of the stem cells toward osteogenic lineage. The amniotic membrane extract administration accelerated cell proliferation and modified the CD marker characteristics which may be due to the induction of differentiation toward a specific lineage. Amniotic membrane extract may enhance the proliferation rate and duplication number of the stem cell through changing the duplication time.

Cryopreservation of ovarian tissue or follicles has been proposed as an alternative method for fertility preservation. Although successful vitrification of follicles has been reported in several mammalian species, the survival rate is generally low. The aim of this study was to investigate the effects of fibroblast growth factor (FGF) and epidermal growth factor (EGF) on in vitro preantral follicle development after vitrification.In this experimental study, preantral follicles with diameter of 150-180 μm were mechanically isolated from ovaries of 18-21 days old NMRI mice. Follicles were vitrified and warmed, then cultured in α-minimal essential medium (α-MEM) without growth factor supplementation as control group (group I), while supplemented with 20 ng/ml FGF (group II), 20 ng/ml EGF (group III), and 20 ng/ml FGF +20 ng/ml EGF (group IV). After 12 days, human chorionic gonadotrophin (hCG)/EGF was added to culture medium, and after 18-20 hours, the presence of cumulus oocyte complexes (COCs) and oocyte maturation were assessed. The chi-square (χ2) test was used to analyze survival and ovulation rates of the follicles. Our results showed that the rate of metaphase II (MII) oocytes in FGF group increased in comparison with control and other treatment groups (p<0.027), but there was no difference between control with EGF and EGF+FGF groups in oocyte maturation rate (p>0.05). There was a significant decrease in survival rate of follicles in EGF+FGE group in comparison with other groups (p<0.008). After in vitro ovulation induction, the follicles in EGF group showed a higher ovulation rate (p<0.008) than those cultured in other groups. FGF has beneficial effect on oocyte maturation, and EGF increases COCs number in vitro. Combination of EGF and FGE decreases the number of survived follicles.

A new strategy for construction of synthetic gene encoding human basic fibroblast growth factor comprising DNA annealing-ligation and augmentation by polymerase chain reaction was introduced. The sequence of the gene and corresponding amino acid chain were modified in order to increase stability of the protein. First, 300 bp and 160 bp fragments of the gene were assembled from 18 oligonucleotides and ligated separately. Then, the shorter fragment was completed by using PCR and combined with the longer one in a proper orientation in pUC 19. One extra nucleotide that had been found in the gene after DNA sequencing and resulted in frame shift, was rectified through the use of PCR directed mutagenesis. Finally, 5'-terminal region of the gene was augmented by means of PCR in order to restore the N-terminal part of the protein and to introduce the NdeI recognition site. The gene was subcloned into the inducible pET-3a expression vector under control of T7 promoter and expressed in Escherichia coli. The identity of the recombinant protein and level of expression were detected by using Western blot analysis and immunoassay. The proposed method has provided a useful strategy for synthesizing modified proteins that might be applied for protein engineering.