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Nikkon F, Hasan S, Rahman M, Hoque M, Mosaddik A, Haque M. Biochemical, Hematological and Histopathological Effects of Duranta repens Stems on Rats. ACTA ACUST UNITED AC 2008. [DOI: 10.3923/ajb.2008.366.372] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Aziz N, Hasan S, Munir M, Tayyab M, Chaudrhy NA. Risk to household contacts of tuberculous patients based on Mantoux test and antibody titre. J Ayub Med Coll Abbottabad 2008; 20:47-50. [PMID: 19385457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
BACKGROUND Tuberculosis, being an infectious disease, carries a risk of infection to contacts attending tuberculous patients. This study was conducted to evaluate the risk for household contacts of tuberculous patients as compared to non-contacts. The study was conducted at PGMI, Gulab Devi Hospital and Defence Housing Authority Lahore. The study included 120 household contacts and 80 non-contacts. METHODS A Cross sectional study for evaluation of antituberculous antibodies levels by ELISA method in two groups; Mantoux positive household contacts 49, Mantoux negative household contacts 71 and normal healthy persons 'non contacts' 80. Routine Haematological investigations like HB, TLC and ESR were done by conventional methods and all the sera of 200 subjects included in the study were tested for IgM, IgG and IgA anti tuberculous antibodies by enzyme linked immunosorbant assay (ELISA). Purified protein derivative 0.1 ml containing 5 TU was injected intradermally. The test was read after 72 hours by measuring the induration around injection site of forearm. RESULTS There was no difference in the average age of the household contacts and non-contacts. The complaints of pyrexia, night sweats and weight loss were more in house hold contacts as compared to non-contacts. The awareness about BCG vaccination was equal in both. There were 49 contacts with positive Mantoux test while negative Mantoux test was found in 71 contacts. There were only three Mantoux positive among eighty non-contacts. There was no significant difference in the presence of IgM among household contacts as compared to non-contacts. However both IgG and IgA were present in significantly higher number of household contacts compared to non-contacts. CONCLUSION Household contacts of patients suffering from active pulmonary tuberculosis have more chances of being infected with Mycobacterium tuberculosis as compared to the healthy non-contact, as shown by the higher levels of antituberculous antibodies & positivity of Mantoux test.
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Ahmad I, Zahin M, Aqil F, Hasan S, Khan M, Owais M. Bioactive compounds from Punica granatum, Curcuma longa and Zingiber officinale and their therapeutic potential. DRUG FUTURE 2008. [DOI: 10.1358/dof.2008.033.04.1186159] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hasan S, Ratnatunga C, Lewis CT, Pillai R. Gut ischaemia following cardiac surgery. Interact Cardiovasc Thorac Surg 2007; 3:475-8. [PMID: 17670290 DOI: 10.1016/j.icvts.2004.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Gut ischaemia following cardiac surgery carries a high mortality and is usually due to non-occlusive mesenteric ischaemia. We reviewed 4464 patients undergoing cardiac surgery over a 5-year period. Sixteen of them developed gut ischaemia post-operatively, 13 of whom were discovered at laparotomies while the remaining 3 were post-mortem diagnoses. Eleven patients were found to have extensive ischaemia and all 11 died irrespective of the treatment and the delay in diagnosis. In five patients ischaemia was localized, involving the caecum in three and terminal ileum in two. They all underwent local resections and survived. The differences in the groups were analysed and the average time between onset of symptoms and laparotomies was longer in the localized ischaemia group compared to the extensive ischaemia group. Our experience illustrates the continuing difficulty in diagnosis of mesenteric ischaemia before gut infarction has occurred. We conclude that different pathologies might be involved in post-cardiac surgery gut ischaemia and although early diagnosis and treatment is considered to be crucial, early laparotomies do not necessarily equate to survival in cases of extensive ischaemia. There is a need to evaluate aggressive strategies for early diagnosis if prognosis is to be improved in these cases.
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Afroza A, Hasan S, Rukunuzzaman M, Hussain SA, Amin R. Carcinoma-rectum in an 11 years old boy. Mymensingh Med J 2007; 16:S70-S72. [PMID: 17917638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Carcinoma rectum is a very uncommon malignancy in childhood. The incidence of colon cancer is found to be 1.3 cases per million children. An eleven years old boy with carcinoma rectum was admitted in the Department of Paediatric Gastroenterology, Bangabandhu Sheikh Mujib Medical University (BSMMU). The boy presented with irregular fever, altered bowel habit, poor appetite, gradual weight loss and abdominal pain. His abdomen was tender with no organomegaly. The rectal wall was tender and hard mass could be felt in the surrounding area on direct rectal examination. Diagnosis was confirmed by biopsy of the tissue from the growth. Surgical resection and anastomosis was done. After one month of surgery chemotherapy was started. Since carcinoma rectum in children has not been reported in Bangladesh we share the information with professionals.
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Hasan S, Rahman N, Hussain K, Raza S. SIMULTANEOUS HPLC-UV QUANTIFICATION OF DILTIAZEM AND N-DEMETHYLDILTIAZEM IN HUMAN PLASMA. ACTA ACUST UNITED AC 2006. [DOI: 10.21608/bfsa.2006.64822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ali J, Hasan S, Ali M. Formulation and development of Gastroretentive drug delivery system for ofloxacin. ACTA ACUST UNITED AC 2006; 28:433-9. [PMID: 17003848 DOI: 10.1358/mf.2006.28.7.1003574] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The aim of the present study was to develop a delivery system wherein the retention of ofloxacin could be achieved for increased local action in gastric region against Helicobacter pylori infection. The formulation was optimized on the basis of in vitro buoyancy and in vitro release in citrate phosphate buffer (pH 3). The hydrodynamically balanced capsules were prepared by physical mixing of various grades of HPMC and poly(ethylene oxide) (PEO) alone as well as in combinations. Cellulose acetate pthalate, liquid paraffin, and ethyl cellulose were used as release modifiers so as to maintain release of drug over a period of 12 h. The capsules prepared with PEOWSR 60K and drug coated with 2.5% ethyl cellulose gave the best in vitro percentage release and were taken as the optimized formulations. Various grades of Eudragit and PEO were used in combination for formulating floating microspheres using solvent diffusion technique for preparation of multiple unit system. The use of two different solvents (dichloromethane and ethanol) that differed in the rate of diffusion led to formation of a hollow core in the microspheres, which was partially responsible for the flotation ability. The in vitro release of the floating capsules and microspheres was found to be 96.02% and 95.83% in 12 h, respectively. Both the dosage forms follow Higuchi model for release from formulations. By fitting the in vitro release data of single unit dosage form into zero-order, first-order, and Higuchi model, it could be concluded that the release followed Higuchi model, as the correlation coefficient (R2 value) was higher than those in the other two release models. In both cases of single and multiple unit dosage form, R2 values for Higuchi model were found to be good, showing that drug release followed non-Fickian diffusion mechanism.
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Gupta BS, Hasan S, Hashim MA, Cui ZF. Effects of colloidal fouling and gas sparging on microfiltration of yeast suspension. Bioprocess Biosyst Eng 2005; 27:407-413. [PMID: 16096765 DOI: 10.1007/s00449-005-0012-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2005] [Accepted: 06/24/2005] [Indexed: 10/25/2022]
Abstract
Cross-flow microfiltration is an important step in separating Baker's yeast (Saccharomyces cerevisiae) from aqueous suspension in many processes. However the permeate flux often declines rapidly due to colloidal fouling of membranes and concentration polarisation. The present work explores the possibility of maintaining acceptable permeate flux by co-current sparging of gas along with the feed, which would scour away colloidal deposits and reduce concentration polarisation of membranes. In this work, both washed and unwashed yeast were used to study the effect of washing to reduce protein fouling of membranes. It was found that permeate flux increased by 45% for liquid throughput of 75 kg/h for a feed concentration of 2.0 kg/m3 of washed yeast as compared with unwashed yeast suspension without gas sparging. For washed yeast suspension, the increase in gas flow rate from 0.5 lpm to 1.5 lpm (30 l/h to 90 l/h) had beneficial effect on permeate flux. It is concluded that in the present case, the gas flow rate should be less than or equal to the liquid flow rate for enhancement of permeates flux.
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Joshi S, Husain MM, Chandra R, Hasan SK, Srivastava RC. Hydroxyl radical formation resulting from the interaction of nickel complexes of L-histidine, glutathione or L-cysteine and hydrogen peroxide. Hum Exp Toxicol 2005; 24:13-7. [PMID: 15727051 DOI: 10.1191/0960327105ht493oa] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
L-histidine, L-cysteine, reduced glutathione (GSH) and other bioligands, which are ubiquitously present in biological systems, are recognized as antioxidants. Studies have shown that nickel (II) complexed with these ligands catalyzes the disproportionation of H2O2, leading to the generation of hydroxyl radicals (OH radical). However, none of the studies could provide information regarding effective concentrations at which these ligands act either as pro-oxidant or antioxidant. Therefore, the observed paradoxical behaviour of biological antioxidants in nickel-induced oxidative response was evaluated. Benzoic acid (BA) is hydroxylated by OH radical to form highly fluorescent dihydroxy benzoate (OH-BA). We used this model to study the effect of nickel complexes of L-histidine, GSH or L-cysteine on the hydroxylation of BA. The concentration-dependent effect of L-histidine, GSH and L-cysteine, or nickel on the hydroxylation of BA was studied. The hydroxylation of BA was significantly enhanced up to 1:0.5 molar ratio (Ni:hist or GSH). However, beyond 1:0.5 molar ratios, histidine/GSH inhibited the hydroxylation and complete inhibition was observed at 1:1 molar ratios. Sorbitol and caffeic acid, considered as scavengers of hydroxyl radicals, inhibited nickel-induced hydroxylation of BA. The present study demonstrates paradoxical behaviour of these bioligands. They act as pro-oxidant at lower ligand ratios and as antioxidant at higher ligand ratios. The redox properties of nickel complexes with histidine, GSH or cysteine reported here may be crucial for the toxicity of nickel.
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Joshi S, Hasan SK, Chandra R, Husain MM, Srivastava RC. Scavenging action of zinc and green tea polyphenol on cisplatin and nickel induced nitric oxide generation and lipid peroxidation in rats. BIOMEDICAL AND ENVIRONMENTAL SCIENCES : BES 2004; 17:402-409. [PMID: 15745244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
OBJECTIVE Toxic metal ions have been implicated in the generation of reactive oxygen species (ROS) and nitric oxide (NO). Metallothionines (MT) and plant flavonoids have been reported in the intervention against oxidative damage. We investigated the effect of zinc induced MT and green tea polyphenol (GTP) in reducing the oxidative responses induced by nickel and platinum. METHODS Zinc (10 mg/kg b. wt, sc) was administered to rats twice at a gap of 24 hrs and GTP (10 mg/100 mL in drinking water) was fed ad libitum for 8 days. Nickel chloride (150 umol/kgb.wt, ip) and cisplatin (50 mumol/kg b.wt, sc) was administered to rats 24 h after Zn or GTP pre-treatment. Animals of all the groups were sacrificed 16 hrs after treatment and biochemical markers for toxicity were monitored. RESULTS Zinc or GTP pre-treatment caused significant protection against nickel or cisplatin enhanced mortality in rats, and reduction in lipid peroxidation and NO. CONCLUSION It is proposed that inhibition of ROS and NO by GTP and zinc may prove useful as a selective pharmacological agent in the amelioration of metal toxicity.
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Srinivasan S, Fern AI, Selvaraj S, Hasan S. Randomized double-blind clinical trial comparing topical and sub-Tenon's anaesthesia in routine cataract surgery †. Br J Anaesth 2004; 93:683-6. [PMID: 15321935 DOI: 10.1093/bja/aeh254] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Several local anaesthetic techniques are available for cataract surgery. Recently, topical anaesthesia has gained in popularity. A randomized trial was designed to compare patient discomfort and intraoperative complications following routine cataract surgery under topical or sub-Tenon's anaesthesia. METHODS A randomized double-blinded placebo-controlled clinical trial of 210 patients assigned to either a sub-Tenon's group (sub-Tenon's anaesthesia with placebo topical balanced salt solution, n=140) or a topical anaesthesia group (topical anaesthesia with placebo sub-Tenon's injection of balanced salt solution, n=70) was carried out. All patients underwent phacoemulsification with intraocular lens implantation. Patients in the sub-Tenon's group received a single injection (3 ml) of a combination of lidocaine 2% (2 ml) and bupivacaine 0.75% (1 ml), and four doses of topical placebo (balanced salt solution). Patients in the topical anaesthesia group received four doses of topical proxymethocaine 0.5% and a placebo sub-Tenon's injection (3 ml) of balanced salt solution. No intracameral injection of local anaesthetic was given. A 10-point visual analogue pain scale was used preoperatively and for postoperative pain assessment immediately after the operation and 30 min postoperatively. The intraoperative complications in the two groups were recorded. RESULTS The mean pain score immediately after surgery was 2.42 (sd 2.2) in the sub-Tenon's group and 3.44 (2.3) in the topical anaesthesia group (P=0.0043). The mean pain score 30 min after surgery was 1.24 (1.7) in the sub-Tenon's group and 2.25 (2.2) in the topical anaesthesia group (P=0.0009). CONCLUSIONS Patients undergoing cataract surgery under topical anaesthesia experience more postoperative discomfort than patients receiving sub-Tenon's anaesthesia. Surgery-related complications were similar in both groups.
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Hasan S, Beckly D, Rahamim J. Oesophagorespiratory fistulas as a complication of self-expanding metal oesophageal stents. Endoscopy 2004; 36:731-4. [PMID: 15280982 DOI: 10.1055/s-2004-825668] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Self-expanding metal oesophageal stents are considered by many to be the ideal palliative treatment for malignant dysphagia, but there have been reports of life-threatening complications associated with their use. We report three cases in which oesophagorespiratory fistulas were caused by the use of these stents.
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Conway DH, Hasan SK, Simpson ME. Target-controlled propofol requirements at induction of anaesthesia: effect of remifentanil and midazolam. Eur J Anaesthesiol 2002; 19:580-4. [PMID: 12200947 DOI: 10.1017/s0265021502000935] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVE Target-controlled infusions of anaesthetic agents have become increasingly available. They can involve the use of propofol in combination with an opioid or a benzodiazepine. The effect site concentration of propofol infusions has been advocated as a method of estimating drug distribution. We investigated the influence of co-induction with remifentanil and midazolam on effect site propofol requirements at induction of anaesthesia using target-controlled infusions. METHODS Sixty-six consenting adult patients were randomly allocated to three treatment groups. Each group received induction of anaesthesia with a different total intravenous technique. One group was induced with target-controlled propofol alone; another received target-controlled propofol and target-controlled remifentanil (3 ng mL-1); and the last received midazolam (0.03 mg kg-1), target-controlled remifentanil (3 ng mL-1) and target-controlled propofol. Computer simulation was used to calculate effect site concentrations. We recorded propofol dose and effect site concentration at loss of verbal response. RESULTS The effect site concentration (Ce50) of propofol alone was 2.19 micrograms mL-1. This was reduced to 1.55 micrograms mL-1 during co-induction with remifentanil and further reduced to 0.64 microgram mL-1 with midazolam premedication (P < 0.001; ANOVA). CONCLUSIONS We conclude that co-induction with remifentanil alone or with midazolam can be used to reduce propofol doses at induction of anaesthesia using target-controlled infusions. We believe that using effect site concentration may prove a useful tool in routine clinical practice.
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Shetty SC, Kini U, D'Cruz MN, Hasan S. Angioleiomyoma in the tonsil: an uncommon tumour in a rare site. Br J Oral Maxillofac Surg 2002; 40:169-71. [PMID: 12180214 DOI: 10.1054/bjom.2001.0714] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
An angioleiomyoma was excised from the palatine tonsil in a 30-year-old woman who complained of a painless swelling in the region of the tonsil. The mucosa covering the lesion showed prominent dilated blood vessels, necessitating vascular laboratory investigations to exclude any possibility of an aneurysm arising from the carotid system. The mass was excised with little blood loss. This was an uncommon tumour in an unusual site and required radio-imaging and angiographic studies of the great vessels of the head and neck before any operation was attempted. To the best of our knowledge, this is the first case reported in English.
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Hassa PO, Covic M, Hasan S, Imhof R, Hottiger MO. The enzymatic and DNA binding activity of PARP-1 are not required for NF-kappa B coactivator function. J Biol Chem 2001; 276:45588-97. [PMID: 11590148 DOI: 10.1074/jbc.m106528200] [Citation(s) in RCA: 253] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Poly(ADP-ribose) polymerase 1 (PARP-1)-deficient mice are protected against septic shock, diabetes type I, stroke, and inflammation. We report that primary cells from PARP-1(-/-) animals are impaired in kappa B-dependent transcriptional activation induced by different stimuli involved in inflammatory and genotoxic stress signaling. PARP-1 was also required for p65-mediated transcriptional activation. PARP-1 enzymatic inhibitors did not inhibit the transcriptional activation of a kappa B-dependent reporter gene in wild type cells. Remarkably, neither the enzymatic activity nor the DNA binding activity of PARP-1 was required for kappa B-dependent transcriptional activation in PARP-1(-/-) cells complemented with different PARP-1 mutants. However, PARP-1 interacted in vitro directly with both subunits of NF-kappa B (p50 and p65), and mapping of the interaction domains revealed that both subunits bind to different PARP-1 domains. Furthermore, a PARP-1 mutant lacking the enzymatic and DNA binding activity interacted comparably to the wild type PARP-1 with p65 or p50. Finally, we showed that PARP-1 is activating the natural inducible nitric-oxide synthase and P-selectin promoter in a kappa B-dependent manner upon stimulation of the cells with inflammatory stimuli or cotransfection of p65. Our results provide evidence that neither the DNA binding nor the enzymatic activity of PARP-1 but its direct protein-protein interaction with both subunits of NF-kappa B is required for its coactivator function, thus expanding the role of PARP-1 as an essential and novel classical transcriptional coactivator for kappa B-dependent gene expression in vivo.
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Srivastava AK, Hasan SK, Srivastava RC. Arsenicism in India: dermal lesions and hair levels. ARCHIVES OF ENVIRONMENTAL HEALTH 2001; 56:562. [PMID: 11958558 DOI: 10.1080/00039890109602907] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hasan S, Stucki M, Hassa PO, Imhof R, Gehrig P, Hunziker P, Hübscher U, Hottiger MO. Regulation of human flap endonuclease-1 activity by acetylation through the transcriptional coactivator p300. Mol Cell 2001; 7:1221-31. [PMID: 11430825 DOI: 10.1016/s1097-2765(01)00272-6] [Citation(s) in RCA: 133] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We describe a role for the transcriptional coactivator p300 in DNA metabolism. p300 formed a complex with flap endonuclease-1 (Fen1) and acetylated Fen1 in vitro. Furthermore, Fen1 acetylation was observed in vivo and was enhanced upon UV treatment of human cells. Remarkably, acetylation of the Fen1 C terminus by p300 significantly reduced Fen1's DNA binding and nuclease activity. Proliferating cell nuclear antigen (PCNA) was able to stimulate both acetylated and unacetylated Fen1 activity to the same extent. Our results identify acetylation as a novel regulatory modification of Fen1 and implicate that p300 is not only a component of the chromatin remodeling machinery but might also play a critical role in regulating DNA metabolic events.
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Zia T, Hasnain SN, Hasan SK. Evaluation of the oral hypoglycaemic effect of Trigonella foenum-graecum L. (methi) in normal mice. JOURNAL OF ETHNOPHARMACOLOGY 2001; 75:191-195. [PMID: 11297850 DOI: 10.1016/s0378-8741(01)00186-6] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Trigonella foenum-graecum (Fenugreek) (Leguminosae) is employed as a herbal medicine. Its seeds are known for their carminative, tonic and antidiabetic effects. A curative dose of Trigonella foenum-graecum also produces antiulcer action. In this study we have investigated the hypoglycaemic activities of the aqueous extract of the seeds Trigonella foenum-graecum in normal mice using oral route of adminstration. The methanolic extract administered through the same route produced hypoglycaemic effect only at the dose of 1 g/kg body weight. The aqueous extract is under further investigation to determine the chemical structure of the active component. The presence of hypoglycaemic activity in aqueous and methanolic extract indicates that the active compounds are polar in nature.
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Shetty SC, Hasan S, Chary G, Balasubramanya AM, Das UC, Harshad D. Lymphangiomatous macroglossia causing upper airway obstruction and associated Plummer-Vinson syndrome. Otolaryngol Head Neck Surg 2001; 124:477-8. [PMID: 11283514 DOI: 10.1067/mhn.2001.114452] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Shetty SC, Gupta S, Nagsubramanium S, Hasan S, Cherry G. Mandibular metastasis from renal cell carcinoma. A case report. Indian J Dent Res 2001; 12:77-80. [PMID: 11665400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
Renal cell carcinoma (RCC) metastasizing to the mandible and subsequently spreading to oropharynx in a 62 year old man is reported. The patient presented with solitary mandibular lesion with hematuria, which on further investigation was diagnosed to be RCC with no other systemic involvement. Clinical manifestation of the mandibular metastasis from RCC is rarely seen. A case is reported and literature regarding extracranial head and neck metastasis by RCC is reviewed.
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Hasan S, Hassa PO, Imhof R, Hottiger MO. Transcription coactivator p300 binds PCNA and may have a role in DNA repair synthesis. Nature 2001; 410:387-91. [PMID: 11268218 DOI: 10.1038/35066610] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The transcriptional coactivator p300 interacts with many transcription factors that participate in a broad spectrum of biological activities, such as cellular differentiation, homeostasis and growth control. Mouse embryos lacking both p300 alleles die around mid-gestation, with pleiotropic defects in morphogenesis, in cell differentiation and, unexpectedly, in cell proliferation because of reduced DNA synthesis. Here we show that p300 may have a role in DNA repair synthesis through its interaction with proliferating cell nuclear antigen (PCNA). We show that in vitro and in vivo p300 forms a complex with PCNA that does not depend on the S phase of cell cycle. A large fraction of both p300 and PCNA colocalize to speckled structures in the nucleus. Furthermore, the endogenous p300-PCNA complex stimulates DNA synthesis in vitro. Chromatin immunoprecipitation experiments indicate that p300 is associated with freshly synthesized DNA after ultraviolet irradiation. Our results suggest that p300 may participate in chromatin remodelling at DNA lesion sites to facilitate PCNA function in DNA repair synthesis.
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