1
|
Thasneem CK, Vijayasankar GR, Venkateswarlu BS, Chandira RM, Shanmuganathan S. In vitro Antioxidant Activity and Preliminary Phytochemical Evaluation of Different Extracts of Aerva javanica. Pharmacognosy Res 2022. [DOI: 10.5530/pres.14.4.68] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
2
|
Yewale RV, Natarajan K, Ubal Dhus J, Parameswaran SA, Ramaswamy Palaniswamy K, Babu Vinish D, Somasundaram A, Ramakrishnan A, Karmegam S, Arun RS, Manmohan US, Mahadevan B, Harri Prasad B, Chandrasekar TS, Gokul BJ, Dutta A, Joseph AJ, Venkatraman J, Ganesh P, Shanmuganathan S, Alagammai PL, Ramasubramanian R, Venkatakrishnan L, Ganesan R, Chandrasekaran Arun A, Srinivas S, Kannan M, Revathy MS, Sathiyasekaran M, Sarangapani A, Rajesh N, Arulselvan V, Aravind A, Premkumar K, Kavitha S, Varadarajulu HV, Manimaran M, Basumani P, Murali A, Ramakrishna BS. Inflammatory bowel diseases in Tamil Nadu: A survey of demographics, clinical profile, and practices. JGH Open 2021; 5:1306-1313. [PMID: 34816017 PMCID: PMC8593807 DOI: 10.1002/jgh3.12673] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/11/2021] [Accepted: 10/20/2021] [Indexed: 11/11/2022]
Abstract
BACKGROUND Inflammatory bowel disease (IBD) is increasingly diagnosed in South Asia. This survey by the Tamil Nadu Chapter of the Indian Society of Gastroenterology (TNISG) documents the demography, clinical profile, and therapeutic practices related to IBD in Tamil Nadu. METHODS TNISG members from 32 institutions completed an online cross-sectional questionnaire on IBD patients from March 2020 to January 2021. RESULTS Of 1295 adult IBD patients, 654 had Crohn's disease (CD), 499 ulcerative colitis (UC), and 42 IBD-unclassified (IBD-U). CD and UC showed a unimodal age distribution. A total of 55% were graduates or postgraduates. A positive family history was noted in 30, other risk factors were uncommon. In CD, the pattern of involvement was ileocolonic (42.8%), ileal (34.7%), colonic (18.9%), and upper gastrointestinal (3.5%); while in UC, disease was characterized as extensive (44.9%), left-sided (41.7%), or proctitis (13.4%). Perineal disease, perianal fistulae, and bowel obstruction were noted in 4.3, 14.0, and 23.5%, respectively, of CD. The most widely used drugs were mesalamine, azathioprine, and corticosteroids. Surgery was undertaken in 141 patients with CD and 23 patients with UC. Of the 138 patients with pediatric IBD (≤16 years), 23 were characterized as very early onset IBD (VEO-IBD), 27 as early-onset, and 88 as adolescent IBD. VEO-IBD were more likely to have a positive family history of IBD and were more likely to have perineal disease and to have the IBD-U phenotype. Among pediatric IBD patients, corticosteroids, mesalamine, and azathioprine were the most commonly used medications, while 25 pediatric patients received biologics. CONCLUSION This study provides important information on demography, clinical profile, and treatment practices of IBD in India.
Collapse
|
3
|
Sircar S, Malik YS, Kumar P, Ansari MI, Bhat S, Shanmuganathan S, Kattoor JJ, Vinodhkumar O, Rishi N, Touil N, Ghosh S, Bányai K, Dhama K. Genomic Analysis of an Indian G8P[1] Caprine Rotavirus-A Strain Revealing Artiodactyl and DS-1-Like Human Multispecies Reassortment. Front Vet Sci 2021; 7:606661. [PMID: 33585597 PMCID: PMC7873603 DOI: 10.3389/fvets.2020.606661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 12/14/2020] [Indexed: 12/03/2022] Open
Abstract
The surveillance studies for the presence of caprine rotavirus A (RVA) are limited in India, and the data for the whole-genome analysis of the caprine RVA is not available. This study describes the whole-genome-based analysis of a caprine rotavirus A strain, RVA/Goat-wt/IND/K-98/2015, from a goat kid in India. The genomic analysis revealed that the caprine RVA strain K-98, possess artiodactyl-like and DS-1 human-like genome constellation G8P[1]-I2-R2-C2-M2-A3-N2-T6-E2-H3. The three structural genes (VP2, VP4, and VP7) were close to caprine host having nucleotide-based identity range between 97.5 and 98.9%. Apart from them, other gene segments showed similarity with either bovine or human like genes, ultimately pointing toward a common evolutionary origin having an artiodactyl-type backbone of strain K-98. Phylogenetically, the various genes of the current study isolate also clustered inside clades comprising Human-Bovine-Caprine isolates from worldwide. The current findings add to the knowledge on caprine rotaviruses and might play a substantial role in designing future vaccines or different alternative strategies combating such infections having public health significance. To the best of our knowledge, this is the first report on the whole-genome characterization of a caprine RVA G8P[1] strain from India. Concerning the complex nature of the K-98 genome, whole-genome analyses of more numbers of RVA strains from different parts of the country are needed to comprehend the genomic nature and genetic diversity among caprine RVA.
Collapse
|
4
|
Shanmuganathan S, Mustapha FI, Wilson A. Evaluation of sustainability of non-communicable diseases risk factor program in Malaysia. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa166.1142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Non-communicable diseases (NCDs) in Malaysia have risen substantially over the last two decades. We aimed to (i) evaluate the sustainability of the existing NCDs risk factor program implemented under the National Strategic Plan and (ii) identify challenges and factors impeding the sustainability of the NCDs program.
Methods
A mixed-method approach using a combination of the Program Sustainability Assessment Tool
with 40-item instrument assessing 8 domains (organizational capacity, program adaptation, program evaluation, communications, strategic planning, funding stability, environmental support and partnerships) and 5 open-ended questions were administered to 80 key managers from district directors of chronic disease programs in Malaysia. The mean score for each of the 8 sustainability domains and the overall mean sustainability score were determined. Data analysis was performed using Statistical Package for the Social Sciences (SPSS) version 25.
Results
Seven domains scored a mean of ≥ 4. The domains of communications (cross-site mean, 4.5 on a scale of 1-7) and organizational capacity (mean, 4.4) had the highest ratings. Funding stability had the lowest rating (mean, 3.8). The overall mean sustainability score was 4.2. Open-ended responses revealed challenges by program leaders, including implementation difficulties, factors impede planning for NCDs sustainability program, lack of financial, staff support and staff training which are largely consistent with the scaled domains.
Conclusions
Capacity issues affecting the sustainability of NCDs program in Malaysia are qualitatively similar to other countries. Future work should aim at improving funding stability and integrating evidence-based public health strategies to sustain implemented NCDs program.
Key messages
Researchers could utilize this tool to assess program design and strategies promoting sustainability during implementation process for long term program sustainment. Investments in leadership support for integrating program evaluation into implementation and greater funding flexibility may enhance sustainability of evidence-based public health program for NCDs.
Collapse
|
5
|
Koushik AK, Ganesh P, Shanmuganathan S. Incidence of Cirrhotic Cardiomyopathy among Hundred Patients of Tamil Nadu, India- A Cross-sectional Study. J Clin Diagn Res 2020. [DOI: 10.7860/jcdr/2020/46768.14278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Introduction: Cardiac dysfunction in cirrhosis may affect quality of life, prognosis and also may aggravate the course in patients undergoing invasive procedures such as surgery, insertion of a Transjugular Intrahepatic Portosystemic Shunts (TIPS), and liver transplantation. Aim: To evaluate the association of cardiomyopathy in cirrhotic patients of Tamil Nadu region in India. Materials and Methods: This cross-sectional study included 100 diagnosed cirrhotic patients. The patient’s cardiac status was obtained from Electrocardiography (ECG) and echocardiography. Liver profile was obtained from biochemical assays and ultrasonography of abdomen. The patients were classified as per cirrhosis grading system, Child Toucotte Pugh (CTP) scoring. The association was analysed using frequency analysis, percentage analysis and Chi-square test. Results: Prolonged QTc (>0.44 sec) was seen in 35% of the study population (p-value-0.014). A 10% of patients had systolic dysfunction and 25% showed diastolic dysfunction. Also, these patients showed positive troponin T and elevated Brain Natriuretic Peptide (BNP). The incidence of cardiomyopathy in cirrhotic patients was 28% in this study. Conclusion: This study established 28% incidence of cardiomyopathy in cirrhotic patients. This association may further be evaluated in larger study samples to provide a better prognosis and quality of life in cirrhotic patients treated with liver transplantation or other surgical procedures.
Collapse
|
6
|
van 't Sant I, van Eden WJ, Engbersen MP, Kok NFM, Woensdregt K, Lambregts DMJ, Shanmuganathan S, Beets-Tan RGH, Aalbers AGJ, Lahaye MJ. Diffusion-weighted MRI assessment of the peritoneal cancer index before cytoreductive surgery. Br J Surg 2018; 106:491-498. [PMID: 30353920 DOI: 10.1002/bjs.10989] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 07/17/2018] [Accepted: 07/31/2018] [Indexed: 01/09/2023]
Abstract
BACKGROUND Patients with limited peritoneal metastases from colorectal cancer may be candidates for an aggressive surgical approach including cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (CRS-HIPEC). Selection is based on surgical inspection during laparoscopy or laparotomy. The aim of this study was to investigate whether diffusion-weighted MRI (DW-MRI) can be used to select patients for CRS-HIPEC. METHODS This was a prospective study at a tertiary referral centre. Patients with confirmed or suspected colorectal peritoneal metastases scheduled for exploratory laparotomy or laparoscopy were eligible. Two radiologists assessed the peritoneal cancer index (PCI) on CT (CT-PCI) and DW-MRI (MRI-PCI). The reference standard was PCI at surgery. Radiologists were blinded to the surgical PCI and to each other's findings. The main outcome was the accuracy of DW-MRI in predicting whether patients had resectable disease (PCI less than 21) or not. RESULTS Fifty-six patients were included in the study, of whom 49 could be evaluated. The mean(s.d.) PCI at surgery was 11·27(7·53). The mean MRI-PCI was 10·18(7·07) for reader 1 and 8·59(7·08) for reader 2. Readers 1 and 2 correctly staged 47 of 49 and 44 of 49 patients respectively (accuracy 96 and 90 per cent). Both readers detected all patients with resectable disease with a PCI below 21 at surgery (sensitivity 100 per cent). No patient was overstaged. The intraclass correlation (ICC) between readers was excellent (ICC 0·91, 95 per cent c.i. 0·77 to 0·96). MRI-PCI had a stronger correlation with surgical PCI (ICC 0·83-0·88) than did CT-PCI (ICC 0·39-0·44). CONCLUSION DW-MRI is a promising non-invasive tool to guide treatment selection in patients with peritoneal metastases from colorectal cancer.
Collapse
|
7
|
Mani M, Srikanth P, Gnanskandan S, Vijayaraghavan S, Shanmuganathan S. Mutations in Hepatitis B virus polymerase gene/partial surface gene among Chronic HBV carriers as markers for anti-viral drug resistance and escape mutants. CANADIAN JOURNAL OF BIOTECHNOLOGY 2017. [DOI: 10.24870/cjb.2017-a85] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
8
|
Yasam VR, Jakki SL, Senthil V, Eswaramoorthy M, Shanmuganathan S, Arjunan K, Nanjan MJ. A pharmacological overview of lamotrigine for the treatment of epilepsy. Expert Rev Clin Pharmacol 2016; 9:1533-1546. [DOI: 10.1080/17512433.2016.1254041] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
9
|
Shanmuganathan S, Thanawala V. Ultrasound-Guided Regional Anesthesia in Children (A Practical Guide). Br J Anaesth 2016. [DOI: 10.1093/bja/aew155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
10
|
Osmani RAM, Kulkarni PK, Shanmuganathan S, Hani U, Srivastava A, M P, Shinde CG, Bhosale RR. A 32full factorial design for development and characterization of a nanosponge-based intravaginal in situ gelling system for vulvovaginal candidiasis. RSC Adv 2016. [DOI: 10.1039/c5ra26218f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The rationale behind present research effort was to enhance CTZ solubility and efficacyviaforming complex with hydroxypropyl β-cyclodextrin (HP-β-CD) nanosponges.
Collapse
|
11
|
Gupta I, Ouhtit A, Fernando A, Abd Elmageed Z, Shanmuganathan S. CD146/Akt/NF-kappa-B/Latexin, a novel pathway suppressing breast tumor growth. Ann Oncol 2015; 26:iii31. [DOI: 10.1093/annonc/mdv121.05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023] Open
|
12
|
Ouhtit A, Fernando A, Elmageed ZA, Gupta I, Shanmuganathan S. P233 CD146/Akt/NF-κB/latexin is a novel pathway involved in suppressing breast tumor growth. Breast 2015. [DOI: 10.1016/s0960-9776(15)70265-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
|
13
|
Gupta I, Shanmuganathan S, Ouhtit A. 370 Discovery of the genes that underpin the transition to malignant phenotype of breast tissues in a highly consanguineous region. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70496-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
14
|
Ouhtit A, Gupta I, Shanmuganathan S, Al-Kindy I, Al-Riyami H. Molecular mechanisms underpinning the effectiveness of the combination of camel milk and urine in the clearance of breast cancer cells. PHARMANUTRITION 2014. [DOI: 10.1016/j.phanu.2013.11.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
15
|
Ouhtit A, Gupta I, Fernando A, Gaur R, Shanmuganathan S, Al-Riyami H, Raj M. CD146 Suppresses Breast Tumor Invasion via its Novel Downstream Transcriptional Target Gene, TIMPV. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu070.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
16
|
Gupta I, Abdraboh M, Hollenbach A, Shanmuganathan S, Al-Riyami H, Raj M, Ouhtit A. The Interplay Between the Cell Adhesion Molecules CD44 and CD146 in Breast Cancer Metastasis. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu070.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
17
|
Al-Riyami H, Gupta I, Madani S, Shanmuganathan S, Abdraboh ME, Al-Farsi Y, Raj M, Ouhtit A. TGF-β2, a Novel Target of CD44-Promoted Breast Cancer Invasion. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu070.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
18
|
Al-Riyami H, Madani S, Gupta I, Shanmuganathan S, Abdraboh ME, Al-Farsi Y, Raj MHG, Ouhtit A. Abstract P6-04-16: TGF-b2, a novel target of CD44-promoted breast cancer invasion. Cancer Res 2013. [DOI: 10.1158/0008-5472.sabcs13-p6-04-16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Hyaluronan (HA) mediates communication between cancer cells and the environment via interactions with the cell surface receptor CD44. We have previously shown that CD44-HA interaction in BC cells promotes adhesion to bone marrow endothelial cells. This suggests that HA/CD44 signalling may be correlated with breast cancer (BC) metastasis. The long-term objective of this study is to increase our understanding of the mechanisms by which CD44-HA interaction promotes BC metastasis, and further identify and validate CD44-downstream transcriptional targets for anti-metastatic therapy.
Pursuant to this goal, we have developed a tetracycline (tet)-regulated expression of CD44 gene in the BC cell line MCF-7 (B5 clone) and identified TGF-beta2 (Transforming Growth Factor beta-2; 3 fold induction) as a potential CD44s-downstream transcriptional target by microarray analysis. To further validate this finding, the same RNA samples, used for microarray analysis and their corresponding protein lysates collected from the BC cell line MCF-7-B5, were examined for CD44 expression in the presence of HA for 18, 24, and 48 hr post-tet withdrawal. Expression of TGF-beta 2 was examined using RT-PCR and western-Blot analyses.
Our results showed that TGF-beta2 mRNA levels were significantly elevated following the removal of tet at 18, 24, and 48 h post-HA stimulation compared to the parental cells. Furthermore, the TGF-beta2 precursor protein increased in a time-dependent pattern upon HA-stimulation and in the absence of tet. More interestingly, inhibition of CD44 gene by RNAi method decreased TGF-beta2 expression upon HA-stimulation and in the absence of tet.
Our data strongly support the hypothesis that TGF-beta2 is a potential target of HA/CD44- downstream-signaling mediating BC cell invasion. Ongoing investigation aims to elucidate the signal transduction pathways coupling CD44 to the regulation of TGF-beta2 expression, and further validate CD44/TGF-beta2 axes in breast tumor invasion and metastasis.
Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P6-04-16.
Collapse
|
19
|
Johir MA, Shanmuganathan S, Vigneswaran S, Kandasamy J. Performance of submerged membrane bioreactor (SMBR) with and without the addition of the different particle sizes of GAC as suspended medium. BIORESOURCE TECHNOLOGY 2013; 141:13-18. [PMID: 23545069 DOI: 10.1016/j.biortech.2013.03.032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 03/04/2013] [Accepted: 03/07/2013] [Indexed: 06/02/2023]
Abstract
In this study the effect of different particle sizes of granular activated carbon (GAC) on the performance of a submerged membrane bioreactor (SMBR) was investigated. The sizes of GAC used were 150-300, 300-600 and 600-1200 μm. The SMBR was operated at a filtration flux of 20 L/m(2)h. The removal of dissolved organic carbon (DOC) and chemical oxygen demand (COD) with the addition of GAC was 95%. The concentration of biopolymers, humic, building block and low molecular weight neutral and acids in the SMBR effluent was reduced by 20%, 66-76%, 20-50%, 30-56%, respectively. It helped to reduce the sludge volume index (SVI) and transmembrane pressure (TMP) development by 30-40% and 58%, respectively. However, the removal of NH₄(+) and PO₄(3-) was relatively low of 35-45% and 34-43%, respectively. The SMBR effluent was rich in PO₄(3-) and was removed/recovered using hydrated ferric oxide (HFO). The removal of PO₄(3-) was almost 90%.
Collapse
|
20
|
Gupta I, Madani S, Abdraboh M, Al RH, Muzumdar S, AbdElmageed Z, Shanmuganathan S, Bhat S, Ramkumar A, Hakkim L, Ouhtit A. Abstract P4-06-16: TGF-β2, A Novel Target of CD44-Promoted Breast Cancer Invasion. Cancer Res 2012. [DOI: 10.1158/0008-5472.sabcs12-p4-06-16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Hyaluronan (HA) mediates communication between cancer cells and the environment via interactions with the cell surface receptor CD44. We have previously shown that CD44-HA interaction in BC cells promotes adhesion to bone marrow endothelial cells. This suggests that HA/CD44 signalling may be correlated with breast cancer (BC) metastasis. The long-term objective of this study is to increase our understanding of the mechanisms by which CD44-HA interaction promotes BC metastasis, and further identify and validate CD44-downstream transcriptional targets for anti-metastatic therapy.
Materials & Methods: Pursuant to this goal, we have developed a tetracycline (tet)-regulated expression of CD44 gene in the BC cell line MCF-7 (B5 clone) and identified TGF-β2 (Transforming Growth Factor beta-2; 3 fold induction) as a potential CD44s-downstream transcriptional target by microarray analysis. To further validate this finding, the same RNA samples, used for microarray analysis and their corresponding protein lysates collected from the BC cell line MCF-7-B5, were examined for CD44 expression in the presence of HA for 18, 24, and 48 hr post-tet withdrawal. Expression of TGF-β2 was examined using RT-PCR and western-Blot analyses.
Results: Our results showed that TGF-β2 mRNA levels were significantly elevated following the removal of tet at 18, 24, and 48 h post-HA stimulation compared to the parental cells. Furthermore, the TGF-β2 precursor protein increased in a time-dependent pattern upon HA-stimulation and in the absence of tet. More interestingly, inhibition of CD44 gene by RNAi method decreased TGF-β2 expression upon HA-stimulation and in the absence of tet.
Conclusion: Our data strongly support the hypothesis that TGF-β2 is a potential target of HA/CD44- downstream-signaling mediating BC cell invasion. Ongoing investigation aims to elucidate the signal transduction pathways coupling CD44 to the regulation of TGF-β2 expression, and further validate CD44/TGF-β2 axes in breast tumor invasion and metastasis.
Citation Information: Cancer Res 2012;72(24 Suppl):Abstract nr P4-06-16.
Collapse
|
21
|
Shanmuganathan S, AbdElmageed Z, Fernando A, Gaur R, Ramkumar A, Bhat S, Gupta I, Muzumdar S, Hakkim L, Ouhtit A. Abstract P4-06-14: CD146-suppresses breast tumor invasion via a novel transcription target TIMPv. Cancer Res 2012. [DOI: 10.1158/0008-5472.sabcs12-p4-06-14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The function of the cell adhesion receptor CD146, a recently discovered marker of endothelial cells and a tumor promoter of melanoma and other cancers, is controversial in breast cancer (BC). However several lines of evidence supports its role as a tumor suppressor in BC. Further, the molecular mechanisms underpinning this suppression are unknown, neither has the ligand for CD146 been identified. Using a novel validated Enhanced Green Fluorescent Protein (EGFP)-inducible systems of CD146 expression both in vitro and in vivo, we provide here molecular and functional evidence of CD146 and its novel transcriptional target TIMPv (a variant of tissue inhibitor of metallo-proteinases) in underpinning the suppression of BC invasion.
Tetracycline (tet-on) CD146 system was developed in both MCF-7 and MDA-231 BC founder cell lines, and validated using time course RT-PCR and western blot analyses, and fluorescent microscopy. In functional experiments, induction of CD146 inhibited BC cell migration and invasion. TIMPv, the only endogenous protein inhibitor known for metallocarboxypeptidases, was identified by expression profiling as a novel transcriptional target of CD146-signaling, an association validated by quantitative PCR and immunoblotting experiments in a range of breast and melanoma cancer cells. However, siRNA inhibition of CD146 in the SKMel-28 melanoma cell line increased TIMPv expression, suggesting that while TIMPv is a positive transcriptional target of CD146 in BC cells, it is negatively regulated in melanoma cells. Furthermore, using invasion assay, the functional relevance of TIMPv to CD146-suppressed metastasis was demonstrated by selective suppression of TIMPv in CD146-expressing BC inducible cells using RNAi. More interestingly, induction of CD146 expression in vivo, using the tet-on CD146 expression system in BC Xenograft model resulted in suppression of breast tumor growth. Further, Clinical analysis of breast tissue samples by Immunohistochemistry showed that TIMPv expression patterns paralleled those of CD44s during breast tumor progression. Pharmacological and molecular approaches revealed that the activation of NFκB via Akt pathway couples CD146 to the transcription of TIMPv in BC cells.
Our study is the first report to provide a functional molecular link of a novel transcriptional target of CD146, TIMPv, to cancer via a unique axis that underpin CD146-suppressed BC progression; TIMPv is a potential target for guiding the development of novel therapeutic strategies for BC.
Citation Information: Cancer Res 2012;72(24 Suppl):Abstract nr P4-06-14.
Collapse
|
22
|
Sekharan TR, Palanichamy S, Tamilvanan S, Shanmuganathan S, Thirupathi AT. Formulation and Evaluation of Hydroxypropyl Methylcellulose-based Controlled Release Matrix Tablets for Theophylline. Indian J Pharm Sci 2011; 73:451-6. [PMID: 22707833 PMCID: PMC3374565 DOI: 10.4103/0250-474x.95649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 07/12/2011] [Accepted: 07/23/2011] [Indexed: 11/17/2022] Open
Abstract
The objectives of the study were to formulate hydroxypropyl methyl cellulose-based controlled release matrix tablets for theophylline with varying drug:polymer ratios (1:1 and 1:2) and differing tablet hardness (5, 6 and 7 kg/cm(2)), and to evaluate the tablet's physico-chemical properties such as hardness, uniformity of weight, friability, drug content and in vitro drug release. Initially, granules were made by wet granulation technique and evaluated for angle of repose, bulk density, tapped density, bulkiness, compressibility index and hausner ratio. The results indicate good flow property of the granules and thus, the evaluated tablet physical properties were within the acceptable limits. The FT-IR study for the F-6 formulation showed that there was no interaction between the drug and the polymer. In vitro release studies were performed using Disso-2000 (paddle method) in 900 ml of pH 7.4 at 50 rpm. The result indicated that at high drug:polymer ratio (1:2) and hardness value 7 kg/cm(2), prolonged drug release was observed than the low drug: polymer ratio (1:1) and hardness values (5 and 6 kg/cm(2)). The release kinetics was found to follow korsmeyers-peppas model and the mechanism of drug release was by non-fickian or anomalous diffusion. The F-6 formulation was chosen for stability studies. F-6 formulation was stable when it was kept at different temperatures for a period of 6 months.
Collapse
|
23
|
Lakshmi TSR, Shanmugasundaram N, Shanmuganathan S, Karthikeyan K, Meenakshi J, Babu M. Controlled release of 2, 3 desulfated heparin exerts its anti-inflammatory activity by effectively inhibiting E-selectin. J Biomed Mater Res A 2010; 95:118-28. [DOI: 10.1002/jbm.a.32791] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
24
|
Shanmuganathan S, Tanveer B, Clark S. 410: Outcome of Lung Graft Volume Reduction for Oversized Donors during Pulmonary Transplantation. J Heart Lung Transplant 2010. [DOI: 10.1016/j.healun.2009.11.425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
25
|
Mason DJ, Shanmuganathan S, Mortimer FC, Gant VA. A fluorescent Gram stain for flow cytometry and epifluorescence microscopy. Appl Environ Microbiol 1998; 64:2681-5. [PMID: 9647848 PMCID: PMC106444 DOI: 10.1128/aem.64.7.2681-2685.1998] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The fluorescent nucleic acid binding dyes hexidium iodide (HI) and SYTO 13 were used in combination as a Gram stain for unfixed organisms in suspension. HI penetrated gram-positive but not gram-negative organisms, whereas SYTO 13 penetrated both. When the dyes were used together, gram-negative organisms were rendered green fluorescent by SYTO 13; conversely, gram-positive organisms were rendered red-orange fluorescent by HI, which simultaneously quenched SYTO 13 green fluorescence. The technique correctly predicted the Gram status of 45 strains of clinically relevant organisms, including several known to be gram variable. In addition, representative strains of gram-positive anaerobic organisms, normally decolorized during the traditional Gram stain procedure, were classified correctly by this method.
Collapse
|