MYELOID-SPECIFIC FERRITIN LIGHT CHAIN DELETION DOES NOT EXACERBATE SEPSIS-ASSOCIATED AKI

Sepsis-associated acute kidney injury (SA-AKI) is a key contributor to the life threatening sequalae of sepsis. Mechanistically, SA-AKI is a consequence of unabated myeloid cell activation and oxidative stress that induces tubular injury. Iron mediates inflammatory pathways directly and through regulating the expression of ferritin, an iron storage protein comprised of ferritin light (FtL) and heavy chain (FtH). Previous work revealed myeloid FtH deletion leads to a compensatory increase in intracellular and circulating FtL and is associated with amelioration of SA-AKI. We designed this study to test the hypothesis that loss of myeloid FtL will exacerbate the sepsis-induced inflammatory response and worsen SA-AKI. We generated a novel myeloid-specific FtL knockout mouse and induced sepsis via cecal ligation and puncture or lipopolysaccharide endotoxemia. As expected, myeloid FtL and serum ferritin levels were significantly lower in the knockout mice. Interestingly, while sepsis led to production of pro- and anti-inflammatory cytokines, there was no statistical difference between the genotypes. There was a similar loss of kidney function and injury, identified by expression of kidney injury molecule-1 and neutrophil gelatinase associated lipocalin. RNA sequencing revealed upregulation of pathways for cell cycle arrest and autophagy post-sepsis, but no significant differences were observed between genotypes, including in key genes associated with ferroptosis, an iron-mediated form of cell death. FtL deletion did not impact activation of NFkB or HIF-1a signaling, key inflammatory pathways associated with dysregulated host response. Taken together, while FtL overexpression was shown to be protective, loss of FtL did not influence sepsis pathogenesis.

Genome-Wide CRISPR Screen Identifies Phospholipid Scramblase 3 as the Biological Target of Mitoprotective Drug SS-31

Key Points

Background

The synthetic tetrapeptide Szeto–Schiller (SS)-31 shows promise in alleviating mitochondrial dysfunction associated with common diseases. However, the precise pharmacological basis of its mitoprotective effects remains unknown.

Methods

To uncover the biological targets of SS-31, we performed a genome-scale clustered regularly interspaced short palindromic repeats screen in human kidney-2, a cell culture model where SS-31 mitigates cisplatin-associated cell death and mitochondrial dysfunction. The identified hit candidate gene was functionally validated using knockout cell lines, small interfering RNA-mediated downregulation, and tubular epithelial–specific conditional knockout mice. Biochemical interaction studies were also performed to examine the interaction of SS-31 with the identified target protein.

Results

Our primary screen and validation studies in hexokinase 2 and primary murine tubular epithelial cells showed that phospholipid scramblase 3 (PLSCR3), an understudied inner mitochondrial membrane protein, was essential for the protective effects of SS-31. For in vivo validation, we generated tubular epithelial–specific knockout mice and found that Plscr3 gene ablation did not influence kidney function under normal conditions or affect the severity of cisplatin and rhabdomyolysis-associated AKI. However, Plscr3 gene deletion completely abrogated the protective effects of SS-31 during cisplatin and rhabdomyolysis-associated AKI. Biochemical studies showed that SS-31 directly binds to a previously uncharacterized N-terminal domain and stimulates PLSCR3 scramblase activity. Finally, PLSCR3 protein expression was found to be increased in the kidneys of patients with AKI.

Conclusions

PLSCR3 was identified as the essential biological target that facilitated the mitoprotective effects of SS-31 in vitro and in vivo.

Downregulation of ATF-4 Attenuates the Endoplasmic Reticulum Stress-Mediated Neuroinflammation and Cognitive Impairment in Experimentally Induced Alzheimer's Disease Model

Protein aggregation is invariably associated with the inflammation as a factor in Alzheimer's disease (AD). We investigated the interaction between downstream factors of endoplasmic reticulum (ER) stress pathway and inflammation, with implications in cognitive impairment in AD. Amyloid-β (Aβ)(1-42) was administered by bilateral intracerebroventricular (icv) injection in the brain of adult male Wistar rats to experimentally develop AD. The cognitive impairment was assessed by measuring behavioral parameters such as Morris water maze and novel object recognition tests. Levels of pro-inflammatory cytokines such as interleukin (IL)-1β and tumor necrosis factor (TNF)-α and anti-inflammatory cytokines IL-4 and IL-10 were measured by the enzyme-linked immunosorbent assay (ELISA) in different rat brain regions. Inflammatory marker proteins such as cyclo-oxygenase (COX)-2 and phosphorylation of nuclear factor kappa B (NF-КB) (p65) were measured by the western blotting. Gene expression of ER stress downstream factors such as ATF-4, CHOP, and GADD-34 was analyzed by qRT-PCR. Histological studies were performed to check Aβ accumulation and neuronal degeneration. Integrated stress response inhibitor (ISRIB) was used to confirm the specific role of ER stress-mediated inflammation in cognitive impairment. Administration of Aβ(1-42) resulted in alteration in levels of inflammatory cytokines, inflammatory proteins, and mRNA levels of ER stress downstream factors. ISRIB treatment resulted in attenuation of Aβ(1-42)-induced ER stress, inflammation, neurodegeneration, and cognitive impairment in rats. These results indicate that ER stress-mediated inflammation potentiates the cognitive impairment in AD. An understanding of cascade of events, interaction of ER stress which was a hallmark of the present investigation together with inflammation and modulation of downstream signalling factors could serve as potent biomarkers to study AD progression. Schematic representation of interaction between ER stress and inflammation. Administration of Aβ(1-42) resulted in ER stress which caused the activation of factors of PERK pathway, inflammation, neuronal degeneration, and cognitive impairment. ISRIB treatment caused downregulation of ATF-4 and attenuation of inflammation indicating a role of ER stress-mediated inflammation in the cognitive impairment in AD. The site of action of ISRIB is shown in blue color.

Protective effect of rosmarinic acid on the transmembrane transporter Ctr1 expression in cisplatin-treated mice

AIMS

Cisplatin (cis-diamminedichloroplatinum(II), CP) is a platinum-based anticancer drug widely used in the treatment of solid malignancies. However, its side effects, particularly nephrotoxicity, are limiting factors in its clinic use. Rosmarinic acid (RA), a natural antioxidant compound, is reported to attenuate oxidative stress and associated pathophysiological outcomes. Our study aimed to explore the protective effect of RA against CP-induced acute kidney injury (AKI).

MATERIALS AND METHODS

We investigated the effect of RA at the dose of 100 mg/kg on AKI induced by CP (20 mg/kg) in mice. Various parameters of nephrotoxicity such as levels of serum electrolytes, albumin, and globulin were measured using standardized methods. Besides, a specific biomarker of damage to proximal tubular cells, kidney injury molecule-1 (Kim-1), was measured in the serum by ELISA. mRNA expression of Kim-1 and a transmembrane transporter, copper transporter 1 (Ctr1), was analyzed by quantitative reverse transcriptase-polymerase chain reaction. CTR1 expression was also analyzed by western blot technique.

RESULTS

RA treatment restored the downregulated CTR1 , a renal transmembrane transporter in CP-treated mice. It was accompanied by a reduction in the level of serum albumin and globulin. Serum electrolytes such as Na+, K+, and Ca2+ in CP-treated mice were found to be restored with RA treatment. Moreover, RA also significantly downregulated the increased expression of nephrotoxicity biomarker KIM-1.

CONCLUSIONS

Overall, RA proved to be an effective nephroprotective compound which afforded protection at cellular and subcellular levels with an appreciable modulatory effect on a transmembrane transporter.

Modulatory role of BV6 and chloroquine on the regulation of apoptosis and autophagy in non-small cell lung cancer cells

Aims

Non-small cell lung cancer (NSCLC) is one of the aggressive tumors mostly diagnosed in the advanced stage. Therapeutic failure and drug resistance pose a major problem in NSCLC treatment primarily due to alterations in autophagy and loss of apoptosis. Therefore, the present study aimed to investigate the importance of the second mitochondria-derived activator of caspase mimetic BV6 and autophagy inhibitor chloroquine (CQ) on the regulation of apoptosis and autophagy, respectively.

Subjects and Methods

Study was conducted on NCI-H23 and NCI-H522 cell lines to evaluate the effect of BV6 and CQ on the transcription and translation level of LC3-II, caspase-3, and caspase-9 genes by quantitative real-time-polymerase chain reaction and western blotting techniques.

Results

In NCI-H23 cell line, BV6 and CQ treatments showed increased mRNA and protein expression of caspase-3, and caspase-9 compared to its untreated counterpart. BV6 and CQ treatments also caused downregulation of LC3-II protein expression compared to its counterpart. In NCI-H522 cell line, BV6 treatment showed a significantly increased expression of caspase-3 and caspase-9 mRNA and protein expression levels whereas BV6 treatment downregulated the expression level of LC3-II protein. A similar pattern was also observed in CQ treatment when compared with the respective controls. Both BV6 and CQ modulated in vitro expression of caspases and LC3-II which have critical regulatory roles in apoptosis and autophagy, respectively.

Conclusions

Our findings suggest that BV6 and CQ could be promising candidates in NSCLC treatment and there is a need to explore them in vivo and in clinical applications.

Functional consequence of myeloid ferritin heavy chain on acute and chronic effects of rhabdomyolysis-induced kidney injury

Acute kidney injury (AKI) is a serious complication of rhabdomyolysis that significantly impacts survival. Myoglobin released from the damaged muscle accumulates in the kidney, causing heme iron-mediated oxidative stress, tubular cell death, and inflammation. In response to injury, myeloid cells, specifically neutrophils and macrophages, infiltrate the kidneys, and mediate response to injury. Ferritin, comprised of ferritin light chain and ferritin heavy chain (FtH), is vital for intracellular iron handling. Given the dominant role of macrophages and heme-iron burden in the pathogenesis of rhabdomyolysis, we studied the functional role of myeloid FtH in rhabdomyolysis-induced AKI and subsequent fibrosis. Using two models of rhabdomyolysis induced AKI, we found that during the acute phase, myeloid FtH deletion did not impact rhabdomyolysis-induced kidney injury, cell death or cell proliferation, suggesting that tubular heme burden is the dominant injury mechanism. We also determined that, while the kidney architecture was markedly improved after 28 days, tubular casts persisted in the kidneys, suggesting sustained damage or incomplete recovery. We further showed that rhabdomyolysis resulted in an abundance of disparate intra-renal immune cell populations, such that myeloid populations dominated during the acute phase and lymphoid populations dominated in the chronic phase. Fibrotic remodeling was induced in both genotypes at 7 days post-injury but continued to progress only in wild-type mice. This was accompanied by an increase in expression of pro-fibrogenic and immunomodulatory proteins, such as transforming growth factor-β, S100A8, and tumor necrosis factor-α. Taken together, we found that while the initial injury response to heme burden was similar, myeloid FtH deficiency was associated with lesser interstitial fibrosis. Future studies are warranted to determine whether this differential fibrotic remodeling will render these animals more susceptible to a second AKI insult or progress to chronic kidney disease at an accelerated pace.

Resveratrol-Loaded Glutathione-Coated Collagen Nanoparticles Attenuate Acute Seizures by Inhibiting HMGB1 and TLR-4 in the Hippocampus of Mice

Epilepsy is a relatively complicated neurological disorder that results in seizures. The use of resveratrol in treating seizures has been reported in recent studies. However, the low bioavailability of resveratrol and the difficulty of reaching the targeted location in the brain reduce its efficacy considerably. The side effects due to the higher concentration of drugs are another matter of concern. The purpose of the present study is to enhance the antiepileptic potential of resveratrol by delivering it to the brain's targeted location by encapsulating it in glutathione-coated collagen nanoparticles. The collagen nanoparticles increase the bioavailability of resveratrol, while the transport of resveratrol to its target location in the brain is facilitated by glutathione. By encapsulating resveratrol in glutathione-coated collagen nanoparticles, the concentration also substantially decreases. Resveratrol encapsulated in synthesized nanoparticles is referred to as nanoresveratrol. In the present study, nanoresveratrol effectiveness was studied through PTZ-induced seizures (PTZ-IS) and the increasing current electroshock (ICES) test. The efficacy of nanoresveratrol was further established using biochemical analysis, histopathological examinations, ELISA and real-time-PCR tests, and immunohistochemistry examination of the hippocampus of mice. Hence, this study is unique in the sense that it synthesized nanoresveratrol by using glutathione-coated collagen nanoparticles, followed by its application to treating seizures. On the basis of the study results, nanoresveratrol was found to be effective in preventing cognitive impairment in the mice and controlling epilepsy seizures to a greater extent than resveratrol. The proposed nanoformulation also reduces the concentration of resveratrol considerably. The present study results show that even 0.4 mg/kg of nanoresveratrol outperforms 40 mg/kg of resveratrol.

NLRP3 inflammasome in rosmarinic acid-afforded attenuation of acute kidney injury in mice

Cisplatin (CP) is a well-known anticancer drug used to effectively treat various kinds of solid tumors. CP causes acute kidney injury (AKI) and unfortunately, there is no therapeutic approach in hand to prevent AKI. Several signaling pathways are responsible for inducing AKI which leads to inflammation in proximal convoluted tubule cells in the kidney. Furthermore, the nucleotide-binding oligomerization domain (NOD)-like receptor containing pyrin domain 3 (NLRP3) inflammasome is involved in the CP-induced AKI. In this study, we investigated therapeutic effects of rosmarinic acid (RA) against inflammation-induced AKI. RA was orally administered at the dose of 100 mg/kg for two consecutive days after 24 h of a single injection of CP at the dose of 20 mg/kg administered intraperitoneally in Swiss albino male mice. Treatment of RA inhibited the activation of NLRP3 signaling pathway by blocking the activated caspase-1 and downstream signal molecules such as IL-1β and IL18. CP activated HMGB1-TLR4/MyD88 axis was also found to be downregulated with the RA treatment. Activation of nuclear factor-κB and elevated protein expression of cyclooxygenase-2 (COX-2) were also found to be downregulated in RA-treated animals. Alteration of early tubular injury biomarker, kidney injury molecule-1 (KIM-1), was found to be subsided in RA-treated mice. RA has been earlier reported for antioxidant and anti-inflammatory properties. Our findings show that blocking a critical step of inflammasome signaling pathway by RA treatment can be a novel and beneficial approach to prevent the CP-induced AKI.

mRNA expression and protein-protein interaction (PPI) network analysis of adrenal steroidogenesis in response to exposure to phthalates in rats

Phthalate esters such as di-butyl phthalate (DBP) and di-ethyl hexyl phthalate (DEHP) used in personal care and consumer products and medical devices have potential to affect human health. We studied the effect of DBP and DEHP on critical enzymes of glucocorticoid biosynthesis pathway in the adrenal gland and pro-inflammatory cytokines in the serum in male Wistar rats. DEHP and DBP treatment altered the mRNA expression of enzymes of glucocorticoid biosynthesis pathway accompanied by a reduction in glucocorticoid production and elevation in the level of glucocorticoid regulated pro-inflammatory cytokines indicating a cascading effect of phthalates. The analysis of PPI (protein - protein interaction) network involving Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway and Gene Ontology (GO) of enzymes through STRING database revealed that all the proteins have the maximum level of interaction with the selected number of proteins. The STRING database analysis together with in vivo data indicates the potential effects of phthalates on various targets of steroidogenesis pathway with a global biological impact.

Resveratrol loaded nanoparticles attenuate cognitive impairment and inflammatory markers in PTZ-induced kindled mice

Resveratrol has been found to exert protective effects in neurological disorders, including epilepsy. However, its poor bioavailability and difficulty in reaching the brain's targeted location reduce resveratrol's efficacy substantially. The side effects due to the higher concentration of drugs are another matter of concern. The objective of the present study is to propose solutions to these issues by encapsulating resveratrol in glutathione-coated collagen nanoparticles' core. The collagen nanoparticles increase the resveratrol's bioavailability, and glutathione helps in the passage of the encapsulated resveratrol to the target location in the brain. The concentration also substantially reduces due to resveratrol's encapsulation in glutathione-coated collagen nanoparticles. The encapsulated resveratrol is termed nanoresveratrol. The effectiveness of nanoresveratrol on epilepsy seizures was evaluated through histopathological examinations, ELISA tests, and qRT-PCR tests on the hippocampus of the kindled mice. The novelty of the present study thus lies in (i) the synthesis of nanoresveratrol using glutathione-coated collagen nanoparticles and (ii) the application of synthesized nanoresveratrol in the treatment of epilepsy. The study's outcome shows that nanoresveratrol has a favorable impact in reducing cognitive impairment in kindled mice, and it is more effective in controlling epilepsy seizures than resveratrol. The p-values of all the nanoresveratrol-given groups of mice (compared with the diseased group) were substantially smaller (∼10^-4 to 10^-2) than the significance level (0.05), indicating that the nanoresveratrol-given groups are significantly different from the diseased group, i.e., the nanoresveratrol has a significant effect on the mice. The concentration of resveratrol also decreases substantially in the proposed nanoformulation. It was observed that even 0.4 mg/kg of nanoformulation of resveratrol is performing better than 40 mg/kg of resveratrol.

Regulation of miR-126 and miR-122 Expression and Response of Imatinib Treatment on Its Expression in Chronic Myeloid Leukemia Patients

BACKGROUND

MicroRNAs (miRNAs) have been observed to exhibit altered expression patterns in chronic myeloid leukemia (CML). Therefore, this study was aimed to evaluate the clinical importance of miR-126 and miR-122 expression in concert to imatinib response in CML patients.

METHODS

The present study included 100 CML and 100 healthy subjects. The expression of the 2 miRNAs was performed using TaqMan probe chemistry, and snU6 was used as internal control.

RESULTS

The expression of miR-126 and miR-122 was downregulated in CML patients, with a mean fold change ± SD 0.20 ± 0.33 and 0.22 ± 0.37, respectively. While the expression of both miRNAs was analysed before and after imatinib treatment, it was observed that the expression levels of both were increased after imatinib treatment by 26.25-fold (5.33 against 0.20) and 13.95-fold (3.07 against 0.22) and the increase was statistically significant (p < 0.0001 and p < 0.0001, respectively). The expression of miR-126 was not conclusive when compared in different clinical stages of the CML disease as it showed a decreased expression in patients with accelerated phase compared to chronic phase (mean fold change = 0.03 and 0.27, respectively), but patients with chronic phase and blastic phase had comparable expression (mean fold change = 0.27 and 0.24, respectively). We also observed an increased expression of both miRNAs after imatinib therapy in each clinical phase.

CONCLUSION

The study concludes that expression of miR-126 and miR-122 increases after imatinib treatment in CML patients and that miR-126 defines the good responders of imatinib therapy.

Risk factors associated with morbidity and mortality outcomes of COVID-19 patients on the 28th day of the disease course: a retrospective cohort study in Bangladesh

Diverse risk factors intercede the outcomes of coronavirus disease 2019 (COVID-19). We conducted this retrospective cohort study with a cohort of 1016 COVID-19 patients diagnosed in May 2020 to identify the risk factors associated with morbidity and mortality outcomes. Data were collected by telephone-interview and reviewing records using a questionnaire and checklist. The study identified morbidity and mortality risk factors on the 28th day of the disease course. The majority of the patients were male (64.1%) and belonged to the age group 25-39 years (39.4%). Urban patients were higher in proportion than rural (69.3% vs. 30.7%). Major comorbidities included 35.0% diabetes mellitus (DM), 28.4% hypertension (HTN), 16.6% chronic obstructive pulmonary disease (COPD), and 7.8% coronary heart disease (CHD). The morbidity rate (not-cured) was 6.0%, and the mortality rate (non-survivor) was 2.5%. Morbidity risk factors included elderly (AOR = 2.56, 95% CI = 1.31-4.99), having comorbidity (AOR = 1.43, 95% CI = 0.83-2.47), and smokeless tobacco use (AOR = 2.17, 95% CI = 0.84-5.61). The morbidity risk was higher with COPD (RR = 2.68), chronic kidney disease (CKD) (RR = 3.33) and chronic liver disease (CLD) (RR = 3.99). Mortality risk factors included elderly (AOR = 7.56, 95% CI = 3.19-17.92), having comorbidity (AOR = 5.27, 95% CI = 1.88-14.79) and SLT use (AOR = 1.93, 95% CI = 0.50-7.46). The mortality risk was higher with COPD (RR = 7.30), DM (RR = 2.63), CHD (RR = 4.65), HTN (RR = 3.38), CKD (RR = 9.03), CLD (RR = 10.52) and malignant diseases (RR = 9.73). We must espouse programme interventions considering the morbidity and mortality risk factors to condense the aggressive outcomes of COVID-19.

Risk factors associated with morbidity and mortality outcomes of COVID-19 patients on the 28th day of the disease course: a retrospective cohort study in Bangladesh

Diverse risk factors intercede the outcomes of coronavirus disease 2019 (COVID-19). We conducted this retrospective cohort study with a cohort of 1016 COVID-19 patients diagnosed in May 2020 to identify the risk factors associated with morbidity and mortality outcomes. Data were collected by telephone-interview and reviewing records using a questionnaire and checklist. The study identified morbidity and mortality risk factors on the 28th day of the disease course. The majority of the patients were male (64.1%) and belonged to the age group 25-39 years (39.4%). Urban patients were higher in proportion than rural (69.3% vs. 30.7%). Major comorbidities included 35.0% diabetes mellitus (DM), 28.4% hypertension (HTN), 16.6% chronic obstructive pulmonary disease (COPD), and 7.8% coronary heart disease (CHD). The morbidity rate (not-cured) was 6.0%, and the mortality rate (non-survivor) was 2.5%. Morbidity risk factors included elderly (AOR = 2.56, 95% CI = 1.31-4.99), having comorbidity (AOR = 1.43, 95% CI = 0.83-2.47), and smokeless tobacco use (AOR = 2.17, 95% CI = 0.84-5.61). The morbidity risk was higher with COPD (RR = 2.68), chronic kidney disease (CKD) (RR = 3.33) and chronic liver disease (CLD) (RR = 3.99). Mortality risk factors included elderly (AOR = 7.56, 95% CI = 3.19-17.92), having comorbidity (AOR = 5.27, 95% CI = 1.88-14.79) and SLT use (AOR = 1.93, 95% CI = 0.50-7.46). The mortality risk was higher with COPD (RR = 7.30), DM (RR = 2.63), CHD (RR = 4.65), HTN (RR = 3.38), CKD (RR = 9.03), CLD (RR = 10.52) and malignant diseases (RR = 9.73). We must espouse programme interventions considering the morbidity and mortality risk factors to condense the aggressive outcomes of COVID-19.

Tempol (4-hydroxy tempo) protects mice from cisplatin-induced acute kidney injury via modulation of expression of aquaporins and kidney injury molecule-1

Tempol (4-hydroxy tempo), a pleiotropic antioxidant is reported to afford protection against cisplatin (CP)-induced nephrotoxicity. However, molecular mechanisms of action of tempol in improving the renal function in CP-induced nephrotoxicity are not fully understood. We investigated the attenuating effect of tempol against CP-induced alterations in kidney injury molecule-1 (KIM-1) and aquaporins (AQPs) in mice. Tempol (100 mg/kg, po) pretreatment with CP (20 mg/kg ip) showed restoration in renal function markers including electrolytes. CP treatment upregulated mRNA expression of KIM-1 and downregulated AQP and arginine vasopressin (AVP) expression which was attenuated by tempol. Immunoblotting analysis revealed that CP-induced alterations in KIM-1 and AQP expression were restored by tempol. Immunofluorocense study also showed restorative effect of tempol on the expression of AQP2 in CP-treated mice. In conclusion, this study provides experimental evidence that tempol resolved urinary concentration defect by the restoration of AQP, AVP and KIM-1 levels indicating a potential use of tempol in ameliorating the AKI in cancer patients under the treatment with CP.

Anti-inflammatory role of tempol (4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl) in nephroprotection

Inflammation is one of the mechanisms involved in the acute kidney injury (AKI) caused by cisplatin (CP)-induced nephrotoxicity. Tempol (4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl) has powerful antioxidant activity. We investigated its potential nephroprotective effects and the underlying mechanisms that may add further benefits to its clinical usefulness in a CP-induced AKI model. Male Swiss albino mice were divided randomly into four groups: control, CP (20 mg/kg intraperitoneally), tempol (100 mg/kg/day, per os) + CP, and tempol only treatments. Blood samples were collected to analyze renal function parameters. Immunoblotting and immunohistochemical analysis were used to assess the level and localization of inflammatory markers. Tempol afforded protection to animals from CP-induced elevation of inflammatory markers as indicated by reduced expression of nuclear factor-kappa B, cyclooxygenase-2, and tumor necrosis factor-α in kidney tissue. Histological findings and analysis of kidney function markers corroborated with these findings confirming a nephroprotective role for tempol. In conclusion, this study provides important evidence for the promising anti-inflammatory effects of tempol which appears to contribute significantly to its nephroprotective action.

Expression Analysis of Serum microRNA-34a and microRNA-183 in Hepatocellular Carcinoma

Background/objective::

HCC is a multistep process starting from chronic hepatitis that progress through cirrhosis to HCC. MicroRNA expression level was found to be deregulated in HCC. To find out whether the expression level of miR-34a and miR-183 was deregulated in HCC compared to controls without HCC.

Methods:

Real time quantitative PCR was done to find out the miRNA expression level in terms of Ct value followed by statistical analysis.

Results:

Over-expression of miR-183 and under-expression of miR-34a in HCC was detected. All changes in expression level of miR-34a and miR-183 were found to be due to HCC compared to controls without HCC. So both miR-34a and miR-183 were suitable to differentiate HCC from Cirrhosis and chronic hepatitis with an efficient diagnostic power of sensitivity, specificity and expression level. But they might not have any role in patients’ survival.

Conclusion:

miR-34a and miR-183 might be considered as potential markers of HCC screening molecule in addition to other approved panel of marker. Our study warrants further expression level study.

Antimicrobial resistance and in vitro biofilm-forming ability of Enterococci spp. isolated from urinary tract infection in a tertiary care hospital in Dhaka

The biofilm mode of life conveys a survival advantage to the microorganism associated with it. Biofilm on an indwelling urinary catheter consists of adherent microorganisms, their extra cellular products, and host components deposited on the catheter and thus biofilm on urinary catheters results in persistent infections that are resistant to antimicrobial therapy. This study was done during the period of January 2010 to December 2010. Fifty nine enterococci isolated from 1203 urine samples were speciated by conventional microbiological methods and examined for their ability to form biofilm by microtitre plate assay and antimicrobial susceptibility testing by disc diffusion method for 10 clinically relevant antibiotics respectively. Biofilm producing Enterococci were more frequently found in catheterized than in non catheterized patient (p<0.004). Enterococcus faecium showed increased resistantance to multiple antibiotic than Enterococcus faecalis. Significant relationship was found between biofilm production with antibiotic resistance to amoxicillin, co-trimoxazole, ciprofloxacin, gentamycin, cefotaxime, and cefuroxime. This study demonstrated a high propensity among the isolates of Enterococci to form biofilm and a significant association of biofilms with multiple drug resistance. DOI: http://dx.doi.org/10.3329/bmrcb.v40i1.20320 Bangladesh Med Res Counc Bull 2014; 40: 6-9

Protection Effect of Vaxxitek HVT + IBD Vaccine Against Infectious Bursal Disease in Broiler Chickens

The very virulent infectious bursal disease virus (vvIBDV) infection cause constant and frequent outbreaks of IBD. In order to prevent the disease caused by vvIBDV, moderate-virulent live vaccines are usually used in broilers, but these vaccine influence the immune system of chickens and cause the immunosuppression. VAXXITEK® HVT+IBD bivalent vaccine, a novel vaccine produced by Merial Company, is the recombinant vaccine generated by inserting IBDV VP2 gene into the HVT genome. The recombinant vaccine could prevent Marek’s disease and IBD of chickens at the same time after vaccinated by the subcutaneous route at 1-day-old. The objective of this study was to evaluate protection effect of this new vaccine against IBD in broilers. The results of the lab and field immunization trial showed that the vaccination of VAXXITEK® HVT+IBD vaccine did not damage the bursa of broilers; the level of IBD antibody of the VAXXITEK® HVT+IBD vaccination groups was higher than IBD-BLEN® vaccination groups at 21-day-old; the protection effect of the VAXXITEK® HVT + IBD vaccination groups was better than IBD-BLEN® vaccination groups, especially at 21-28 day. The results indicated that VAXXITEK® HVT + IBD vaccine could provide better protection to broiler chickens against IBD.DOI: http://dx.doi.org/10.3329/pa.v24i1-2.19102 Progress. Agric. 24(1&2): 69 - 78, 2013

Fetal Outcome of Pre-eclamptic Mothers with Hyperuricemia

Pre-eclampsia (PE) is considered as a major cause of maternal and fetal morbidity and mortality. When a pre-eclamptic woman develops associated hyperuricemia then fetal outcome may become worse. To observe the fetal outcome of hyperuricemic pre-eclamptic pregnancy in relation to normo-uricemic pre-eclamptic pregnancy in a hospital based comparative and cross-sectional study 62 pre-eclamptic patients were selected purposively. PE was diagnosed by hypertension and proteinuria. PE patients were divided into two groups by there serum uric acid level - Hyperuricemic & Normo-uricemic. Then fetal outcome markers (Stillbirth and low birth weight fetus) of the study groups were observed. In this study significant increased number of low birth weight fetuses was observed in babies born to hyperuricemic pre-eclamptic mothers in comparison with babies born to normo-uricemic pre-eclamptic mothers. According to the observation the estimation of serum uric acid may be considered in management of pre-eclamptic mothers, especially in lowering the rate of poor fetal outcome. DOI: http://dx.doi.org/10.3329/jdnmch.v17i1.12192 J. Dhaka National Med. Coll. Hos. 2011; 17 (01): 41-43

Effectiveness of educational interventions in improving clinical competence of residents in an internal medicine residency program in Pakistan

INTRODUCTION

Medical education is a continuously evolving field. Training institutes and programs should have a process in place to gather continuous feedback and then make appropriate modifications in order to provide education and training effectively. Our study aimed to assess the effect of a quality improvement cycle approach in using various educational interventions within a residency. Effects were measured on the key educational outcomes of residents; medical knowledge, skills and professional attitudes using results of postgraduate examination with both written and clinical skills components.

METHODOLOGY

A number of educational interventions were implemented which included changes in work hours with increased time for self-study, new educational activities including a Residents Hour, a Residents Slide Session, Grand Rounds and Journal Clubs, Clinico-pathological conferences, and a two- week postgraduate course for senior residents. Newer and improved assessment tools were also implemented, including an annual in-training mock exam based on the format of the postgraduate examination. Pass rates in postgraduate examinations (Fellow of College of Physicians and Surgeons exam and Member of Royal College of Physicians exam) were compared before and after the interventions to assess the effectiveness of the interventions.

RESULTS

The first group of residents after introduction of the educational interventions completed residency training in 2001. Postgraduate exam pass rates (sometimes after two or more attempts) were 59.2% (42 of 71 graduates) before 2001 and 86.4% (38 of 44 graduates after 2001 (p = 0.002). The number of candidates passing the examinations in either their first or second attempts before 2001 was 17 of 42 (40.5%), which increased to 33 of 38 (86.8%) after 2001 (p = <0.001).

CONCLUSIONS

Our study describes a number of interventions that were successful in bringing about an improvement in the performance of our residents. These can serve as a guide for postgraduate training programs, particularly those of Internal Medicine, in implementing strategies to strengthen training and enhance the performance of trainees.

Allergic fungal rhinosinusitis in chronic rhinosinusitis

BACKGROUND

Rhinosinusitis is the inflammation of nasal and paranasal sinus mucosa and is associated with mucosal alteration ranging from inflammatory thickening or gross nasal polyp formation.The main objective of this study is to determine the prevalence of allergic fungal rhino sinusitis among the patients having chronic rhino sinusitis with or without polyps who under goes functional endoscopic sinus surgery.

METHODS

The patient with chronic rhinosinusitis with or without polyp who FESS were studied. Surgical specimens were sent for mycology and histopathological analysis for identification of fungus.

RESULTS

Headache 41(82%) and nasal block 45(90%) were the commonest clinical presentation. Out of 50 patients, fungal elements were detected by KOH in 8(16%) of cases and histopathological examination in 11(22%) of cases.

CONCLUSIONS

Allergic Fungal Rhinosinusitisis a common disorder in patients with chronic rhinosinusitis, it need different specific tests for the diagnosis, a more specific diagnostic tests are fungus culture, and IgE to fungal antigen and skin test are needed for definite diagnosis.

A study of ovarian cyst in a tertiary hospital of Kathmandu valley

Ovarian cysts are an extremely common gynecological problem. Majority of ovarian cysts are benign with few cases being malignant. This is a retrospective study of all the cases of ovarian cysts operated in a tertiary hospital (Kathmandu Medical College, KMC) from January 2006 to December 2008. In this 3 years duration, 102 cases (2.0%) were of ovarian cyst out of the total histopathological specimen processed in pathology department. The mean age of presentation was 38years. Ovarian cysts (27.5%) were more commonly seen in the age group 21- 30 years. Bilateral ovaries were involved in 19 cases (18.6%). Among these ovarian cysts, 89 cases (87.3%) were benign and 13 cases (12.7%) were malignant. The most common type of ovarian cyst was serous cystadenoma (40.2%) followed by mature cystic teratoma (15.7%). Metastasis to ovary was seen in 6.9% (7 cases). The most common metastasis was adeno carcinoma from gastro intestinal tract (4 cases). Other metastases to ovary were 2 cases from endometrioid adeno carcinoma of endometrium and 1 case from Non Hodgkin's Lymphoma of small intestine.

Production, characterization, in vitro and ex vivo studies of babchi oil-encapsulated nanostructured solid lipid carriers produced by a hot aqueous titration method

An aqueous dispersion of solid fat nanoparticles of babchi oil (BOSLN) was prepared by means of the hot water titration method. Surface morphology was determined by HR-TEM which revealed a fairly spherical shape of the formulations. Further they were evaluated for in vitro drug release characteristics and ex vivo skin permeation profile, zeta potential and particle diameter, rheological measures and droplet size distribution. Highest values for steady state flux (Jss), permeability coefficient (Kp) and enhancement ratio (Er) were observed for formulation, BOSLN3 comprised of oil [10% v/v; BO (3.33%), CAT (6.67%)], Tween 80 (9.25% v/v), transcutol-P (28.75% v/v) and distilled water (53% v/v). These results suggest that the studied SLN might be promising vehicles for babchi oil in the management of psoriasis.

Barriers in initiating insulin therapy in a South Asian Muslim community

AIMS

Insulin therapy is often required for optimal glycaemic control. Pakistani patients display reluctance to use insulin. We aimed to determine the reasons for this and to assess impressions after initiation of insulin in our patients.

METHODS

Patients with Type 2 diabetes attending Aga Khan Hospital were surveyed using a questionnaire detailing opinions on insulin use. This was a cross-sectional study of two groups, one with no experience with insulin use and the other who were insulin users.

RESULTS

Three hundred and seventeen patients were interviewed, 55.8% male, mean age 53.6 years. Of 210 patients who had never used insulin, 72.9% felt insulin was a measure of last resort and 45.2% thought that tolerance developed to insulin. Only 45.7% felt insulin would reduce complications, while 24% thought that insulin use would interfere with religious obligations. Thirty-four percent thought that it was difficult or very difficult to learn insulin administration, 41% felt that they could not self-inject even if absolutely necessary and 25% stated they would not use insulin in any circumstances. There was an association of lack of education with negative image of insulin usage. Among 107 patients using insulin, 52.3% were hesitant before initiation. However, 78.5% noted an improvement in glucose control and 86% said they would recommend insulin to others.

CONCLUSIONS

Reluctance to use insulin prior to initiation is high, but views improve considerably after insulin initiation. Further awareness of the benefits of insulin use needs to be highlighted and the concerns of our population addressed.

Cysticerci in palpable nodules diagnosed on fine needle aspiration cytology

INTRODUCTION

Cysticercosis is the larval manifestation of the cestode T. solium. It commonly presents as subcutaneous and intramuscular nodules which is often clinically misinterpreted as benign mesenchymal lesions and lymph nodes. Cysticerci in subcutaneous nodules can be diagnosed rapidly and with considerable accuracy by FNAC. This study highlights the cytomorphological features of subcutaneous cysticercosis diagnosed by FNAC.

METHODS

Forty three patients with palpable nodules diagnosed as cysticercosis or suspected as cysticercosis by FNAC between August 2005 to July 2008 were included in the study. Excision biopsy was done in 12 cases where definitive evidence of parasite was not found.

RESULTS

Solitary nodules were present in 36 (83%) patients and multiple nodules were present in seven (17%). In 31 cases (72.09%) definite evidence of cysticercus was found. In 12 cases (27.9%) a suggestion of parasitic inflammation was made based on other cytomorphological features which was confirmed by biopsy in eight cases.

CONCLUSIONS

Human cysticercosis commonly presents as subcutaneous nodules which can be diagnosed with considerable accuracy by FNAC. Definite evidence and suggestion of parasitic inflammation on cytology obviates the need for subsequent histopathological examination.

Cysticerci in Palpable Nodules Diagnosed on Fine Needle Aspiration Cytology

Abstract

Evaluation of fine needle aspiration cytology of lymph nodes in Kathmandu Medical College, Teaching hospital

BACKGROUND

Fine Needle Aspiration Cytology (FNAC) is a simple and rapid diagnostic technique. Because of early availability of results, simplicity, minimal trauma and complications, the aspiration cytology is now considered a valuable diagnostic aid and is part and parcel of a pathologist's repertoire.

OBJECTIVES

The aim of the study was to evaluate the results of fine needle aspiration cytology (FNAC) of lymph nodes in our institution in comparison to result of histopathology.

MATERIALS AND METHODS

The present study on 130 patients of lymphadenopathy was conducted in the Department of Pathology Kathmandu Medical College Teaching hospital, Kathmandu from June 2006 to May 2008 (2 years).

RESULTS

In this series of FNAC cervical lymph nodes were 66 (50.76%), and axillary lymph nodes were 20 (15.38%). Male to female ratio of the patients was 1: 0.9. The age of patients ranged from 3 to 85 years. FNAC diagnosis was found to be as follows : reactive hyperplasia 54( 41.55%), tubercular lymphadenitis 36 (28 %), metastatic carcinoma 16 (12.3%), granulomatous lymphadenitis 12 ( 9.2 % ), lymphoma 8 (6%) and suppurative lymphadenitis 4(3%) . Out of 28 cases of FNAC 26 (92.85%) were consistent with histopathological diagnosis of tubercular lymphadenitis. In metastatic carcinoma to lymph nodes sensitivity and specificity of FNAC were 100% each.

CONCLUSION

FNAC is useful and reliable in diagnosing neoplastic and non- neoplastic lesions of lymph nodes. It helps in planning surgery for malignant cases, where definitive operative intervention can be performed in one session.

Role of FNAC in the diagnosis of salivary gland swellings

OBJECTIVES

The aim of this study was to evaluate the diagnostic accuracy and efficacy of Fine needle aspiration cytology (FNAC) in various salivary gland swellings.

MATERIALS AND METHODS

This retrospective study was performed at Kathmandu Medical College Teaching Hospital (KMCTH) from January 2004- December 2006.During this period a total of 978 FNAC's were done out of which 40 FNAC's were on salivary gland swellings. Correlation was done between cytological smear slides and biopsy slides.

RESULTS

In this series of FNAC, 16 cases (40%) were benign neoplasms, 5 cases (12.5%) malignant neoplasms, non-neoplastic cysts 3 cases (7.5%) and inflammatory lesions 16 cases (40%).Histopathology was available in 24 cases out of which 22 cases correlated with cytology. There were no false positive reports but false negative result was seen in 4 cases. Sensitivity and specificity were 90% and 100% respectively.

CONCLUSION

FNAC is useful in the diagnosis of salivary gland swellings especially in benign conditions with a sensitivity of 90% and specificity of 100%.

Rapid detection of helicobacter pylori by endoscopic brush cytology and comparison with histopathology

OBJECTIVES

The main objective of this study was to assess antral brush cytology as an alternate approach for the diagnosis of H. pylori infection as compared to histopathology.

METHODS

75 cases with diagnosis of antral gastritis underwent endoscopic antral biopsy as well as antral brushing cytology was included irrespective of age and sex. Cytological slides were stained with Giemsa stain & biopsy slides were stained with H&E and Giemsa stain. Correlation was done between cytological smear slides and biopsy slides.

RESULTS

Among 75 cases, H. pylori were positive in 55 (73.4%) cases of biopsy specimens while in brush cytology it was positive in 48 (64%) cases. In 45 (60%) of 75 cases, H. pylori was seen in both biopsy and brush cytology.

CONCLUSION

Endoscopic brush cytology provides an accurate, inexpensive and easy technique in the rapid detection of H.pylori infection.

Fine needle aspiration (FNA) of soft tissue tumours (STT)

OBJECTIVES

The cytological findings of 50 ST Ts were evaluated aiming to determine the role of FNA in diagnosis of STTs

METHODS

Fifty patients with soft tissue tumours underwent FNA in the preoperative investigation during a one year period. The smears were stained with Papanicolaou and May-Graunvald Giemsa stains.

RESULTS

Forty-four cases were reported as benign, whereas 2 were malignant. Four cases revealed insufficient material. The malignant STTs were small round cell tumour and malignant spindle cell tumour. Cytological and histological correlation could be achieved in 40 cases. The overall sensitivity and specificity were 25% and 100% respectively with overall accuracy of 80%.

CONCLUSION

A reliable diagnosis of STTs can be made with FNA when supported by other clinical and other diagnostic data.

Hepatocyte transplantation: A review of laboratory techniques and clinical experiences

Orthotopic liver transplantation (OLT) is standard clinical practice for patients with severe and end-stage chronic liver disease. However, the chronic shortage of donor livers and parallel growth of the transplant waiting list mean that a substantial proportion of patients die while waiting for a donor liver. Attempts to reduce the waiting list by use of split-liver and living-related live donor techniques have had some impact, but additional approaches to management are vital if the death rate is to be significantly reduced. Extensive laboratory research work and limited clinical trials have shown that hepatocyte transplantation may be useful in bridging some patients to OLT. A major limiting factor has been the shortage of mature functioning human hepatocytes, which are currently mostly obtained from livers rejected for OLT. This review examines potential hepatocyte sources, hepatocyte isolation methods and preservation protocols that have been successfully established, along with an overview of clinical results.

A new source of hepatocytes for transplantation

INTRODUCTION

The most effective treatment for acute or chronic liver failure is orthotopic liver transplantation. Worldwide there is a shortage of organs for transplantation. This shortage has called for research into new treatments for management of patients with liver failure. One such treatment is hepatocyte transplantation. During liver resections considerable amounts of normal liver are unavoidably resected. We aim to harvest these hepatocytes and to filter the tumor cells from them to provide a source for transplantation.

MATERIALS AND METHODS

After liver resection, the largest vessel at the resected liver edge was identified and cannulated. Seglen's two-stage technique of perfusing the liver with EDTA and collagenase was performed to harvest the hepatocytes. Ep-CAM Ags are consistently present on the surface of epithelial cells and in particular in colorectal cancer cells. Therefore, MOC31 antibodies (selective Abs for Ep-CAM) attached to magnetic beads were used to target the tumor cells. These tumor cells are selectively removed using a magnet. CEA staining was then used to ensure the hepatocyte collection was tumor cell free. Five million hepatocytes were rosetted with one million HT29 CRC cells to assess the immunomagnetic filtration technique.

RESULTS

The hepatocyte harvesting resulted in 864,000 viable hepatocytes to be harvested per gram of liver. Histochemical staining using CEA demonstrated 75% of the HT29 cells in the hepatocyte collection were removed after one use of magnetic beads.

CONCLUSION

We have demonstrated the successful initial stages of harvesting tumor-free hepatocytes from liver resected for malignancy.

Clinical characteristics and outcomes of diabetic ketoacidosis in Pakistani adults with Type 2 diabetes mellitus

AIMS

The aim of this study was to describe the clinical characteristics and outcomes of diabetic ketoacidosis (DKA) in Pakistani adult population with Type 2 diabetes mellitus.

METHODS

We reviewed the medical records of all adult patients admitted with a diagnosis of DKA and Type 2 diabetes mellitus (DM) and followed their clinical course and outcome. Follow-up data were obtained by chart review or telephone contact where necessary.

RESULTS

Fifty-seven patients fulfilled criteria for inclusion in the study. Their mean age was 48 +/- 7 years. The mean body mass index was 25.5 +/- 6.2 kg/m2. Forty-nine had a prior history of Type 2 DM but DKA was the initial presentation in 14%. Nine were on no treatment, 40 were using oral hypoglycaemic agents and eight were on insulin. A history of prior DKA was noted in eight patients. Infections were the most common precipitating factor (63%). There were 12 deaths. Follow-up after a period ranging between 12 and 43 months revealed that 30/45 patients remained on OHA without recurrence of DKA.

CONCLUSION

This report highlights the need for the growing recognition of DKA occurring in adults with Type 2 DM in the South Asian population. Mortality rates are unacceptably high but the majority of survivors remain insulin independent.

Use of nucleic acid testing for blood donor screening of human immunodeficiency virus and hepatitis C virus in the Saudi population

OBJECTIVE

To determine the risk of transfusion associated infection for human immunodeficiency virus and Hepatitis C virus using nucleic acid testing.

METHODS

During March 1998, 400 donor blood samples from the Saudi population that were negative by serology were further tested for human immunodeficiency virus 1 and 2 and Hepatitis C virus using nucleic acid testing.

RESULTS

A total of 400 were tested by nucleic acid testing, 381 of these were negative, 4 were indeterminate but were found to be negative on repeat testing and one seronegative sample was found to be positive for Hepatitis C virus.

CONCLUSION

Due to the low prevalence of human immuno-deficiency virus in the Kingdom of Saudi Arabia, nucleic acid testing of blood donors by serology is adequate for screening. But the higher prevalence of Hepatitis C virus and increased risk of transmission would indicate that nucleic acid testing may be warranted for Hepatitis C virus in the near future.

Antimicrobial susceptibility testing and patterns of resistance at a tertiary care center

Clinical microbiology laboratories are faced with the challenge of accurately detecting emerging antibiotic resistance in bacterial pathogens. In recent years, vancomycin resistant enterococci have emerged, as have penicillin resistant pneumococci and more recently, methicillin-resistant Staphylococcus aureus with reduced susceptibility to vancomycin. In order to detect these emerging resistant pathogens it is essential that antimicrobial susceptibility be carried out by laboratories as an integral part of therapeutic strategies. In this review, we discuss patterns of susceptibility of different antimicrobials as experienced at King Faisal Specialist Hospital and Research Centre, a tertiary care center in Riyadh.

1alpha,25-Dihydroxyvitamin D3 and its analogues, EB1089 and CB1093, profoundly inhibit the in vitro proliferation of the human hepatoblastoma cell line HepG2

BACKGROUND

1alpha,25-dihydroxyvitamin D3 (1,25[OH]2D3) has been shown to inhibit the proliferation of various cancer cells including colon, prostate, melanoma, osteosarcoma and breast cancer.

METHODS

The human hepatoma cell line (HepG2) was cultured with 1,25(OH)2D3 or one of two analogues EB1089 or CB1093 for various durations. Cellular proliferation was measured by uptake of [3H]thymidine, and cell numbers were determined by trypan blue exclusion counting.

RESULTS

1,25(OH)2D3, EB1089 and CB1093 all inhibited proliferation of HepG2 by up to 90% after 5 days of treatment, compared to the untreated controls. Decreased proliferation was associated with an approximately 50% reduction in cell numbers at concentrations of up to 10(-10) mol/L after 5 days of treatment with 1,25(OH)2D3. Cell proliferation rapidly recovered in cultures treated with lower concentrations of 1,25(OH)2D3 (10(-10) and 10(-11) mol/L) when 1,25(OH)2D3 was removed from the cultures by placing cells in serum containing medium without 1,25(OH)2D3. When HepG2 cells were treated with 10(-8) mol/L 1,25(OH)2D3 for 5 weeks, there was still significant inhibition of proliferation, although at week 5 there was 66% inhibition compared to 93% at the end of week 1.

CONCLUSIONS

1,25(OH)2D3, EB1089 and CB1093 all significantly inhibit the proliferation of HepG2 hepatoblastoma cells, with EB1089 being the most potent at lower concentrations. Inhibition can be maintained for at least 4 weeks, but is reversed after removal of vitamin D3.

In vitro and in vivo suppression of growth of hepatocellular carcinoma cells by albendazole

Tubulin protein is a major target of drug molecules, and consequently, tubulin inhibitors have attracted great attention as antimitotic antitumor agents for chemotherapeutic use. It has been shown that, the benzimidazole carbamate group of antiparasitics including albendazole act by inhibiting tubulin polymerization. In this study, albendazole was tested in culture against a range of human, rat and mice hepatocellular carcinoma (HCC) cells and in vivo against human SKHEP-1 tumor growth in nude mice. Albendazole induced a dose-dependent inhibition of [(3)H]thymidine incorporation in all cell lines examined and a dramatic decline in cell numbers in SKHEP-1 cells. The inhibitory effect of albendazole was evident at the 100 nM concentration and at 1000 nM, proliferation in all cell lines examined was inhibited by more than 80%, while, proliferation of HepG2, Hep3B and SKHEP-1 were suppressed by more than 90%, compared to control. Cell cycle analysis revealed that, depending on the dose employed, albendazole can arrest SKHEP-1 cells at both G0-G1 (250 nM) and G2-M (1000 nM) phases of the cycle. Albendazole treatment (300 mg/kg per day oral for 20 days) of nude mice inoculated subcutaneously with SKHEP-1, led to profound suppression of tumor growth. Immunohistochemical analysis of these tumors revealed that compared to control, those treated with albendazole have lower growth fractions. These findings demonstrate that albendazole strongly suppresses both in vitro and in vivo proliferation of HCC cells.

In vitro antiproliferative activity of a medium-chain triglyceride solution of 1,25-dihydroxyvitamin D3 in HepG2 cells

BACKGROUND

Successful targeted delivery of 1,25-dihydroxyvitamin D3 [1,25-D3] for the treatment of liver cancer would necessitate the use of an appropriate delivery agent.

MATERIALS AND METHODS

Using liver cancer cell line HepG2 in culture, we examined, the possibility of using medium-chain triglyceride (MCT) as a solvent for targeted delivery of 1,25-D3. The drug was made up in either the medium or first dissolved in MCT and subsequently diluted in the medium. Cells were exposed for 1 (acute) or 5 days (chronic) to the 2 different formulations of the drug and cell proliferation was measured by [3H]thymidine and cell count methods.

RESULTS

In chronic experiments, exposure of cells to the MCT containing formulation of 1,25-D3 led to significantly greater inhibition of cell proliferation. In the acute experiments where, 1 day 1,25-D3 treatment was followed by 4 days of incubation with normal medium (no drug, no MCT), inhibition of proliferation was more than 2 fold greater in cells exposed to the 1,25-D3/MCT preparation.

CONCLUSION

These results indicate that, 1,25-D3 dissolved in MCT probably accumulates and then acts as a sustained release drug depot formulation, in which case it may have potential for the regional treatment of liver tumors.

The use of lipiodol and medium chain triglyceride as delivery agents for hepatic arterial administration of 1, 25-dihydroxyvitamin D3--a potential new treatment for hepatocellular carcinoma

It is well established that 1, 25 dihydroxyvitamin D3 is capable of inhibiting the proliferation of a number of human cancer cell lines, including hepatoma cell lines. However, clinical usage in the treatment of cancers has been limited by its hypercalaemic effects. We hypothesised that by delivering 1, 25 dihydroxyvitamin D3 dissolved in a lipid based carrier agent as a hepatic arterial infusion it would be possible to achieve high local concentrations within hepatomas for prolonged periods, whilst avoiding high systemic concentrations and hypercalcaemia. We examined this hypothesis by administering a hepatic arterial infusion of 1, 25 dihydroxyvitamin D3 in either Lipiodol, Medium Chain Triglyceride (MCT), or saline to hepatoma bearing rats. Assay of serum and tissue concentrations revealed that this approach using lipiodol or triglyceride results in selective distribution of 1, 25-dihydroxyvitamin D3 into, and retention within hepatoma tissue and low initial systemic serum levels. Lipiodol was more effective in these respects than MCT. This method of administration has potential in the treatment of hepatoma.

Cutaneous myiasis due to Dermatobia hominis in Saudis

Cutaneous myiasis infestations are normally found in South and Central America but increasing travel has resulted in their spread to non-indigenous countries with increasing frequency. We report two cases of cutaneous infestation by Dermatobia hominis in Taif, Saudi Arabia. There was no history of travel outside Saudi Arabia. The source of infection appears to be domestic cattle indicating that these infestations may be endemic in this region.

Hepatic intra-arterial injection of lipiodol-1,25-dihydroxyvitamin D3 for hepatocellular carcinoma in rats

BACKGROUND

1,25-(OH)2 D3 has an in vitro growth regulator effect on different cancers. Unfortunately, dose-limiting toxicity (hypercalcemia) limits its use in anticancer therapy. For primary liver tumors, loco-regional delivery of 1,25-(OH)2 D3 in lipiodol might avoid high systemic concentrations and development of hypercalcemia.

MATERIALS AND METHODS

1,25-(OH)2 D3 alone or mixed in lipiodol, was delivered at different concentrations into the hepatic artery of rats bearing a primary liver tumor. Calcium levels, tumor volume and proliferation index were assessed after treatment.

RESULTS

Serum calcium values were significantly lower when the drug was mixed into lipiodol. Treatment with 10 micrograms of 1,25-(OH)2 D3 in ethanol resulted in a decrease in proliferation index within the tumor.

CONCLUSIONS

The delivery of 1,25-(OH)2 D3 mixed in lipiodol reduces the subsequent elevation of serum calcium. Locoregional treatment with 1,25-(OH)2 D3 was shown for the first time to be effective on primary liver tumor growth in vivo.

Current status and changing trends of antimicrobial resistance in Saudi Arabia

Due to modern travel and ease of spread of infections, it is desirable to widen knowledge of susceptibility of common bacterial isolates from different parts of the world for optimal clinical management and control programs. Over the past decades, antimicrobial resistance has emerged in all kinds of micro-organisms worldwide including Saudi Arabia. This phenomenon is primarily due to increasing antibiotic use and misuse in humans, animals and agriculture. Additionally, the presence of a large expatriate population and a significant number of visitors to the Kingdom annually for pilgrimage and/or work from all over the world may have also facilitated the importation to Saudi Arabia of drug resistant micro-organisms from other countries. Saudi Arabia has witnessed an increase of drug resistant Mycobacterium tuberculosis, Streptococcus pneumoniae, Staphylococcus aureus and some Enterobacteriaceae in the last decade. We describe the status of antimicrobial resistance in Saudi Arabia which is an important focus of antimicrobial resistance for the Gulf Region.