L Rosu

Bio: L Rosu is an academic researcher from University of Medicine and Pharmacy of Craiova. The author has contributed to research in topics: Antibiotics & Drug resistance. The author has an hindex of 4, co-authored 8 publications receiving 119 citations.

Antimicrobial resistance development following surgical site infections.

Abstract: Surgical site infections (SSIs) determine an increase in hospitalization time and antibiotic therapy costs. The aim of this study was to identify the germs involved in SSIs in patients from the Clinical Emergency County Hospital of Craiova (SCJUC) and to assess their resistance to antimicrobials, with comparisons between surgical wards and the intensive care unit (ICU). The biological samples were subjected to classical bacteriological diagnostics. Antibiotic resistance was tested by disc diffusion. We used hierarchical clustering as a method to group the isolates based upon the antibiotic resistance profile. The most prevalent bacterial species isolated were Staphylococcus aureus (S. aureus; 50.72%), followed by Escherichia coli (E. coli; 17.22%) and Pseudomonas aeruginosa; 10.05%). In addition, at lower percentages, we isolated glucose-non-fermenting, Gram-negative bacteria and other Enterobacteriaceae. The antibiotic resistance varied greatly between species; the most resistant were the non-fermenting Gram‑negative rods. E. coli exhibited lower resistance to third generation cephalosporins, quinolones and carbapenems. By contrast, Klebsiella was resistant to many cephalosporins and penicillins, and to a certain extent to carbapenems due to carbapenemase production. The non-fermenting bacteria were highly resistant to antibiotics, but were generally sensitive to colistin. S. aureus was resistant to ceftriaxone (100%), penicillin (91.36%), amoxicillin/clavulanate (87.50%), amikacin (80.00%) and was sensitive to levofloxacin, doxycycline, gentamycin, tigecycline and teicoplanin. The Enterobacteriaceae resistance was only slightly higher in the ICU, particularly to carbapenems (imipenem, 31.20% in the ICU vs. 14.30% in the surgical wards; risk ratio = 2.182). As regards Staphylococcus species, but for non-fermenting bacteria, even if the median was almost the same, the antibiotic resistance index values were confined to the upper limit in the ICU. The data gathered from this study may help infection control teams to establish effective guidelines for antibiotic therapies in various surgical procedures, in order to minimize the risk of developing SSIs by the efficient application of the anti-infection armamentarium.

Histochemical and immunohistochemical evidence of tumor heterogeneity in colorectal cancer.

Abstract: Introduction Intratumoral heterogeneity implies the existence of differences between tumor cells, which can best be shown by histochemical and immunohistochemical techniques. The histological study is a mandatory step in any research aimed at characterizing tumor heterogeneity. Immunohistochemistry (IHC) also plays an important role in the differentiation of tumor types, assessing aggressiveness. Materials and methods Investigated group consisted of 50 patients with colorectal adenocarcinoma, for each were recorded clinicopathological data and harvested samples intraoperatively, which were included in paraffin blocks. We perform Hematoxylin-Eosin staining for histological grade and other indices. IHC study used Avidin-Biotin-Peroxidase (ABC), with the markers: CK7, CK20, MUC1, MUC2, Ki-67, PCNA, p53, KRAS, BCL2, PTEN, EGFR. The resulting data were analyzed by statistical methods. Results Most of colorectal adenocarcinoma studied had no special histological features and had G2 grade. IHC detected in most cases the CK20+÷CK7- phenotype (78%) and MUC1 (74%) protein expression. The proliferation markers (Ki-67 and PCNA) were present in all tumor mass with a variable index, which shows high intratumoral heterogeneity, but p53 and KRAS were distributed more uniformly, showing low intratumoral heterogeneity. PTEN was expressed nuclearly in 86% of the cases and EGFR in 42%. Conclusions The expression profiles of cytokeratins and mucins in the colorectal adenocarcinomas are useful in defining tumor phenotypes with different prognosis and therapy. We found a significant positive correlation between KRAS protein expression and BCL2 and TP53 expression. The study demonstrated the intratumoral and intertumoral heterogeneity, expressed at phenotypic level.

An alternative treatment for Candida infections with Nigella sativa extracts

Abstract: Background Nigella sativa is a herb from the Mediterranean region with antidiabetic, bronchodilator, antioxidant, hepatoprotective, lipid lowering, anti-inflammatory and analgesic properties. Purpose This study aimed to reveal the antifungal activity of aqueous, methanolic and chloroform extracts obtained from the plant seeds, compared with the effect of traditional antifungals. Materials and methods Using standard mycological diagnostic methodology The authors isolated and identified 20 strains of Candida albicans from pathological products collected from patients hospitalised in different departments of the Craiova Emergency Hospital. Aqueous, methanolic and chloroform extracts were made from the seeds of Nigella sativa, in decreasing dilutions, in which Wattman filter paper discs were soaked and dried and then used to achieve the antifungal graph by using the Kirby-Bauer diffusion technique. Simultaneously, the testing was repeated using standard antifungal disks (Becton Dickinson) and the two sets of results compared. The antifungal effect was assessed by measuring the diameter of the inhibition zone, noting the concentration per disk. Results The results show that methanolic extracts of Nigella sativa have the strongest antifungal effect followed by the chloroform extracts. Aqueous extracts showed no antifungal activity. Conclusions The research shows treatment with natural products in a good light as an alternative for treating fungal infections. The authors envisage Nigella sativa extract enhancing the effect of conventional therapy.

Synergic antifungal and antibacterial activity of alcoholic extract of the species Robinia pseudoacacia L. (Fabaceae)

Abstract: Background Plant species Robinia pseudoacacia L. (Fabaceae) has been used as a medicinal plant since ancient times, as its infusions and extracts have antacid, antibacterial, purgative and emenagogic properties. The volatile oil of the flowers is also used in perfumery and cosmetics. Purpose Due to its high content of volatile oil phenolic compounds, flavonoids and tannins with antimicrobial properties, the present study proposed to investigate the antibacterial and antifungal effect of the species Robinia pseudoacacia. Materials and methods The dry powdered flowers, leaves, bark and seeds of Robinia pseudoacacia were subjected to extraction in a Soxhlet extractor with 90% ethanol. The alcoholic extract obtained in the concentration of 100 mg / ml, was tested using sterile discs of Whatman No. 1 filter paper, impregnated with 100 mg extract. Antibacterial and antifungal effects was evaluated by the Kirby-Bauer disc diffusion method, in accordance with the NCCLS / CLSI standard, using the following infectious agents isolated from patients and the corresponding reference strains: methicillin-resistant Staphylococcus aureus and methicillin-sensitive haemolytic S. epidermidis, Streptococcus pyogenes, Enterococcus, Enterobacter aerogenes, Escherichia coli, Salmonella choleraesuis, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus, Candida albicans. Results Extracts from various different parts of the plant had different antibacterial activities. Extracts of flowers and seeds are efficient antibacterials for Gram positive cocci. Bark and leaf extracts were active against Escherichia coli, Pseudomonas, Proteus, Salmonella choleraesuis, Candida albicans. Conclusions These results prove the antimicrobial or antifungal properties of certain extracts of Robinia pseudoacacia L., which offers an alternative treatment with a natural product with synergistic effects with conventional antibacterial treatment.

Study concerning vulvovaginal candidiasis in women with diabetes

Abstract: Background Changes in glucidic metabolism characteristic of diabetes are a contributing factor in causing vulvovaginal candidiasis. Purpose The objective of this study was evaluating the prevalence of morbidity through vaginal candidiasis with Candida albicans in diabetic women and instituting of specific antifungal therapy. Materials and methods The study was conducted on 140 women (aged between 22-40 years) with diabetes, admitted in the Diabetes and Nutrition diseases clinic from Clinical Emergency Hospital of Craiova, Romania, from who were harvested blood and vaginal secretions. Blood sugar levels were determined by biochemical methods. The vaginal secretions were subjected to mycological diagnosis (Gram stain, isolation on Sabouraud media, identification by using chromogenic differential media specific for Candida). The isolates strains were subjected to fungal sensitivity test, using commercial kits: ATB Fungus 3 (BioMerieux, Marcy l’Etoile, France) and Candifast (EliTech France SAS) (5-Fluorocytosine, Amphotericin B, Fluconazole Itraconazole, Voriconazole, Econazole, Miconazole, Ketoconazole and Nystatin). The data was analysed using the Student9s t-test. Results The authors isolated 98 strains of Candida albicans, thus the morbidity by candidiasis was 70%, most of the patients had blood sugar levels between 130–180 mg/dl. The condition was more common in patients aged between 51-60 years (39.80%) and 41-50 years (31.63%). The results of antifungigram showed susceptibility to: Ketoconazole (95.92%), Econazole (89.80%), Fluconazole (85.71%) and Itraconazole (85.71%). Conclusions These results demonstrate the existence of a correlation between hyperglycaemia and vaginal candidiasis. Most of the vulvovaginal candidiases were treated successfully with new antifungal drugs. Although regarded as a banal infection by some, the increased incidence of vaginal candidiasis associated with diabetes raises additional issues regarding prevention and patient management.

A review on therapeutic potential of Nigella sativa: A miracle herb

Abstract: Nigella sativa (N. sativa) (Family Ranunculaceae) is a widely used medicinal plant throughout the world. It is very popular in various traditional systems of medicine like Unani and Tibb, Ayurveda and Siddha. Seeds and oil have a long history of folklore usage in various systems of medicines and food. The seeds of N. sativa have been widely used in the treatment of different diseases and ailments. In Islamic literature, it is considered as one of the greatest forms of healing medicine. It has been recommended for using on regular basis in Tibb-e-Nabwi (Prophetic Medicine). It has been widely used as antihypertensive, liver tonics, diuretics, digestive, anti-diarrheal, appetite stimulant, analgesics, anti-bacterial and in skin disorders. Extensive studies on N. sativa have been carried out by various researchers and a wide spectrum of its pharmacological actions have been explored which may include antidiabetic, anticancer, immunomodulator, analgesic, antimicrobial, anti-inflammatory, spasmolytic, bronchodilator, hepato-protective, renal protective, gastro-protective, antioxidant properties, etc. Due to its miraculous power of healing, N. sativa has got the place among the top ranked evidence based herbal medicines. This is also revealed that most of the therapeutic properties of this plant are due to the presence of thymoquinone which is major bioactive component of the essential oil. The present review is an effort to provide a detailed survey of the literature on scientific researches of pharmacognostical characteristics, chemical composition and pharmacological activities of the seeds of this plant.

Black cumin (Nigella sativa) and its constituent (thymoquinone): a review on antimicrobial effects

Abstract: Nigella sativa seeds have wide therapeutic effects and have been reported to have significant effects against many ailments such as skin diseases, jaundice, gastrointestinal problems, anorexia, conjunctivitis, dyspepsia, rheumatism, diabetes, hypertension, intrinsic hemorrhage, paralysis, amenorrhea, anorexia, asthma, cough, bronchitis, headache, fever, influenza and eczema. Thymoquinone (TQ) is one of the most active constituent and has different beneficial properties. Focus on antimicrobial effects, different extracts of N. sativa as well as TQ, have a broad antimicrobial spectrum including Gram-negative, Gram-positive bacteria, viruses, parasites, schistosoma and fungi. The effectiveness of N. sativa seeds and TQ is variable and depends on species of target microorganisms. The present review paper tries to describe all antimicrobial activities that have been carried out by various researchers.

Prostaglandin E2 EP receptors as therapeutic targets in breast cancer

Abstract: Prostaglandins are lipid compounds that mediate many physiological effects. Prostaglandin E2 (PGE2) is the most abundant prostanoid in the human body, and synthesis of PGE2 is driven by cyclooxygenase enzymes including COX-2. Both elevated expression of COX-2 and increased PGE2 levels have been associated with many cancers including breast cancer. PGE2 exerts its effect by binding to the E series of prostaglandin receptors (EP) which are G protein-coupled receptors. Four EP receptor subtypes exist, EP1–4, and each is coupled to different intracellular signaling pathways. As downstream effectors of the COX-2 pathway, EP receptors have been shown to play a role in breast and other malignancies and in cancer metastasis. The role of each EP receptor in malignant behavior is complex and involves the interplay of EP receptor signaling on the tumor cell, on stromal cells, and on host immune effector cells. While preclinical and epidemiological data support the use of nonsteroidal anti-inflammatory drugs and selective COX-2 inhibitors (COXibs) for the prevention and treatment of malignancy, toxicities due to COXibs as well as less than promising results from clinical trials have laboratories seeking alternative targets. As knowledge concerning the role of EP receptors in cancer grows, so does the potential for exploiting EP receptors as therapeutic targets for the treatment or prevention of cancer and cancer metastasis.

Human papilloma virus: Apprehending the link with carcinogenesis and unveiling new research avenues (Review).

Abstract: Human papilloma viruses (HPV) are a small group of non‑enveloped viruses belonging to the Papillomaviridae family with strong similarities to polyoma viruses. The viral particles consist of a genome in the form of a circular double‑stranded DNA, encompassing eight open reading frames, as well as a non‑enveloped icosahedral capsid. HPV infection is considered the most common sexually transmitted disease in both sexes and is strongly implicated in the pathogenesis of different types of cancer. 'High‑risk' mucosal HPV types, predominantly types 16, 18, 31, 33 and 35, are associated with most cervical, penile, vulvar, vaginal, anal, oropharyngeal cancers and pre‑cancers. Screening for HPV is necessary for the prognosis and for determining treatment strategies for cancer. Novel HPV markers, including proteomic and genomic markers, as well as anti‑papillomavirus vaccines are currently available. The aim of this comprehensive review was to thoroughly present the updated information on virus development, cancer occurrence, treatment and prevention strategies, in an attempt to shed further light into the field, including novel research avenues.