1
|
JawaharJothi G, Kovilpillai B, Subramanian A, Mani JR, Kumar S, Kannan B, Mani S. Effect of tropospheric ozone and its protectants on gas exchange parameters, antioxidant enzymes and quality of Garlic (Allium sativum. L). Int J Biometeorol 2024; 68:991-1004. [PMID: 38528211 DOI: 10.1007/s00484-024-02642-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 11/30/2023] [Accepted: 02/22/2024] [Indexed: 03/27/2024]
Abstract
An experimental study was conducted to assess the detrimental effect of ground-level ozone (O3) on garlic physiology and to find out appropriate control measures against ground-level O3, at TNAU-Horticultural Research farm, Udhagamandalam. Elevated ground ozone levels significantly decreased garlic leaf chlorophyll, photosynthetic rate, stomatal conductance, total soluble solids and pungency. The garlic chlorophyll content was highest in ambient ozone level and lowest in elevated ozone@200 ppb, highest stomatal conductance was recorded in ambient ozone with foliar spray of 3%Panchagavya, and the lowest was observed in elevated ozone@200 ppb. Since the elevated O3 had reduced in garlic photosynthetic rate significantly the lowest was observed in elevated O3@200 ppb and the highest photosynthetic rate was observed in ambient Ozone with foliar spray 3% of panchagavya after a week. The antioxidant enzymes of garlic were increased with increased concentration of tropospheric ozone. The highest catalase (60.97 µg of H2O2/g of leaf) and peroxidase (9.13 ΔA/min/g of leaf) concentration was observed at 200 ppb elevated ozone level. Garlic pungency content was highest in ambient ozone with foliar spray of 0.1% ascorbic acid and the lowest was observed under elevated O3@200 ppb. Highest total soluble solids were observed in ambient ozone with foliar spray of 3%Panchagavya and the lowest observed in elevated ozone@200 ppb. Thus, tropospheric ozone has a detrimental impact on the physiology of crops, which reduced crop growth and yield. Under elevated O3 levels, ascorbic acid performed well followed by panchagavya and neem oil. The antioxidant such as catalase and peroxidase had positive correlation among themselves and had negative correlation with chlorophyll content, stomatal conductance, photosynthetic rate, pungency and TSS. The photosynthetic rate has high positive correlation with chlorophyll content, pungency and TSS. Correlation analysis confirmed the negative effects of tropospheric ozone and garlic gas exchange parameters and clove quality. The ozone protectants will reduce stomatal opening by which the entry of O3 in to the cell will be restricted and other hand they also will alleviate ROS and allied stresses.
Collapse
Affiliation(s)
- Gayathri JawaharJothi
- Division of Environment Science, Indian Agricultural Research Institute, New Delhi, India
- Department of Environmental Sciences, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
| | - Boomiraj Kovilpillai
- Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India.
- Department of Environmental Sciences, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India.
| | - Avudainayagam Subramanian
- Department of Environmental Sciences, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
| | | | - Sudhir Kumar
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, India
| | - Balaji Kannan
- Department of Physical Science and Information Technology Tamil, Nadu Agricultural University, Coimbatore, Tamil Nadu, India
| | - Sudhakaran Mani
- JKK Munirajah College of Agricultural Science, Tamil Nadu, Erode dt, India
| |
Collapse
|
2
|
Kannan B, Pandi C, Pandi A, Jayaseelan VP, Murugan M S, Arumugam P. Altered expression of GLS2 indicates a poor prognosis and correlates with clinicopathological features of oral squamous cell carcinoma. Int J Oral Maxillofac Surg 2024:S0901-5027(24)00029-8. [PMID: 38342749 DOI: 10.1016/j.ijom.2024.01.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 02/13/2024]
Abstract
Glutamine metabolism, governed by enzymes including glutaminase (GLS1 and GLS2), has a pivotal role in cancer progression. The objective of this study was to determine whether GLS2 transcription levels are associated with oral squamous cell carcinoma (OSCC) when compared to matched adjacent normal tissues. Primary tumour and adjacent normal tissues were collected from 51 OSCC patients, and GLS2 mRNA expression analysis was conducted using real-time qPCR. Additionally, The Cancer Genome Atlas-Head and Neck Squamous Cell Carcinoma (TCGA-HNSCC) dataset was utilized to examine GLS2 expression in relation to clinicopathological features, the prognosis, and tumour immune cell infiltration. A significantly reduced expression of GLS2 mRNA was found in the OSCC tissues when compared to the matched adjacent normal tissue samples (P < 0.001), which aligned with the results from the TCGA-HNSCC dataset and immunohistochemistry. Moreover, GLS2 mRNA expression was associated with clinicopathological features including tumour stage, grade, and human papillomavirus status (all P < 0.05), predicted a poorer prognosis (P = 0.024), and was correlated with tumour immune cell infiltration (all P < 0.05) in head and neck squamous cell carcinoma. Functional pathway analysis indicated its involvement in cell proliferation and metabolic cycles. GLS2 dysregulation is linked to oral cancer, suggesting its potential as a predictive prognostic marker for OSCC. Furthermore, targeting glutaminases via GLS2 may represent a promising therapeutic strategy for OSCC treatment.
Collapse
Affiliation(s)
- B Kannan
- Molecular Biology Laboratory, Centre for Cellular and Molecular Research, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
| | - C Pandi
- Molecular Biology Laboratory, Centre for Cellular and Molecular Research, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
| | - A Pandi
- Clinical Genetics Laboratory, Centre for Cellular and Molecular Research, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
| | - V P Jayaseelan
- Clinical Genetics Laboratory, Centre for Cellular and Molecular Research, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
| | - S Murugan M
- Department of Oral and Maxillofacial Surgery, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
| | - P Arumugam
- Molecular Biology Laboratory, Centre for Cellular and Molecular Research, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India.
| |
Collapse
|
3
|
S. S, Kannan B, Paul B. Improved Word Sense Determination in Malayalam using Latent Dirichlet Allocation and Semantic Features. ACM T ASIAN LOW-RESO 2022. [DOI: 10.1145/3476978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Recent years have witnessed phenomenal developments worldwide in the field of
NLP
. But developments in Indian regional languages are very few compared to them. This work is a step towards the construction of a target word sense disambiguation system in Malayalam, which is the regional language of the state of Kerala, India. Word Sense Disambiguation/Determination refers to the task of correctly identifying the sense of an ambiguous word from its context. This is considered an AI-Complete problem in the field of
Natural Language Processing
. For this purpose, an exclusive corpus of 1,147 contexts of target ambiguous words has been created, which to the best of our knowledge is the first attempt in Malayalam. This work describes how the performance of an unsupervised LDA-based approach towards WSD could be improved using semantic features like synonyms and co-occurrence information.
Collapse
Affiliation(s)
- Sruthi S.
- Research Scholar, Department of Computer Applications, Cochin University of Science and Technology, South Kalamassery, Kochi, Kerala, India
| | - B. Kannan
- Professor, Department of Computer Applications, Cochin University of Science and Technology, South Kalamassery, Kochi, Kerala, India
| | - Binu Paul
- Professor, Division of Electronics Eng., SOE Cochin University of Science and Technology, South Kalamassery, Kochi, Kerala, India
| |
Collapse
|
4
|
Kannan B, Campbell DL, Vasconcelos F, Winik R, Kim DK, Kjaergaard M, Krantz P, Melville A, Niedzielski BM, Yoder JL, Orlando TP, Gustavsson S, Oliver WD. Generating spatially entangled itinerant photons with waveguide quantum electrodynamics. Sci Adv 2020; 6:6/41/eabb8780. [PMID: 33028523 PMCID: PMC7541065 DOI: 10.1126/sciadv.abb8780] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 08/21/2020] [Indexed: 05/31/2023]
Abstract
Realizing a fully connected network of quantum processors requires the ability to distribute quantum entanglement. For distant processing nodes, this can be achieved by generating, routing, and capturing spatially entangled itinerant photons. In this work, we demonstrate the deterministic generation of such photons using superconducting transmon qubits that are directly coupled to a waveguide. In particular, we generate two-photon N00N states and show that the state and spatial entanglement of the emitted photons are tunable via the qubit frequencies. Using quadrature amplitude detection, we reconstruct the moments and correlations of the photonic modes and demonstrate state preparation fidelities of 84%. Our results provide a path toward realizing quantum communication and teleportation protocols using itinerant photons generated by quantum interference within a waveguide quantum electrodynamics architecture.
Collapse
Affiliation(s)
- B Kannan
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - D L Campbell
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - F Vasconcelos
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - R Winik
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - D K Kim
- MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA 02420, USA
| | - M Kjaergaard
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - P Krantz
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - A Melville
- MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA 02420, USA
| | - B M Niedzielski
- MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA 02420, USA
| | - J L Yoder
- MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA 02420, USA
| | - T P Orlando
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - S Gustavsson
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - W D Oliver
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA 02420, USA
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| |
Collapse
|
5
|
Kannan B, Kumsa D, Jebaraj AJ, Méndez-Albores A, Georgescu NS, Scherson D. The electrocatalytic properties of adsorbed hemin and its nitrosyl adduct on glassy carbon surfaces toward hydroxylamine in aqueous neutral electrolytes. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.02.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
6
|
Kannan B, Ganapathy E. Choroidal metastases from transitional cell carcinoma of the bladder. Clin Cancer Investig J 2015. [DOI: 10.4103/2278-0513.151939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
7
|
Cornelius LP, Kannan B, Saravanan V, Venkatesan EP. Intramyelinic edema in maple syrup urine disease. Ann Indian Acad Neurol 2014; 17:211-3. [PMID: 25024577 PMCID: PMC4090852 DOI: 10.4103/0972-2327.132638] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Revised: 02/09/2014] [Accepted: 02/09/2014] [Indexed: 12/18/2022] Open
Affiliation(s)
| | - B Kannan
- Department of Neurology, Institute of Child Health, Egmore, Chennai, India
| | - Viveka Saravanan
- Department of Neurology, Institute of Child Health, Egmore, Chennai, India
| | | |
Collapse
|
8
|
Abstract
The fabrication of conductive polymer nanowires and their sensing of nucleic acids, proteins and pathogens is reviewed in this feature article.
Collapse
Affiliation(s)
- J. Travas-Sejdic
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
| | - N. Aydemir
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
| | - B. Kannan
- Revolution Fibres Ltd
- , New Zealand
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
| | - D. E. Williams
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
| | - J. Malmström
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
| |
Collapse
|
9
|
Abstract
Cocaine is used to produce a euphoric effect by abusers, who may be unaware of the devastating systemic and ocular side effects of this drug. We describe the first known case of cilioretinal artery occlusion after intranasal cocaine abuse.
Collapse
Affiliation(s)
- Balaji Kannan
- Department of Medical Retina, Dr. A Govindarajan Eye Hospital and Research Institute, Tiruchirapalli, Tamil Nadu, India.
| | | | | | | |
Collapse
|
10
|
Abstract
Tuberculosis (TB) is one of the most common systemic diseases in India. Intraocular TB is however, rare. Retinal vasculitis is a relatively rare manifestion of intraocular TB. We report a case of bilateral retinal vasculitis in a 19-year-old girl with abdominal tuberculosis. The patient responded well to anti-TB treatment along with a short course of low dose oral steroids. Vision in her right eye however remained compromised due to residual maculopathy. This is the first report of bilateral retinal vasculitis due to colonic TB.
Collapse
Affiliation(s)
- Balaji Kannan
- Retina Clinic, Dr. A. Govindarajan Eye Hospital and Research Institute, Tiruchirapalli, Tamil Nadu, India
| | | | | | | | | |
Collapse
|
11
|
Abstract
Eventration of the diaphragm, most often an isolated entity and detected incidentally, has been known to be associated with several genetic syndromes. Authors report their experience of seeing diaphragmatic eventration in association with Poland syndrome and wandering spleen syndrome and briefly discuss the literature.
Collapse
Affiliation(s)
- M L Kulkarni
- Department of Pediatrics, JJM Medical College, Davangere, Karnataka, India
| | | | | | | | | | | |
Collapse
|
12
|
Abstract
Hyperekplexia is a rare, hereditary, non-epileptic disorder characterized by an exaggerated startle reaction to unexpected auditory, somatosensory and visual stimuli. The authors describe a one-day-old term neonate, who presented with jitteriness and episodic tonic spasms, and his elder sister with hyperekplexia. Hyperekplexia though is a rare disorder is one of the differential diagnoses for refractory tonic spasms in infancy. The prognosis is generally good in hereditary hyperekplexia. Recent molecular studies have revealed many associated mutations in the glycine receptor alpha and beta subunit genes.
Collapse
Affiliation(s)
- M L Kulkarni
- Department of Pediatrics, JJMMC, Davangere, Karnataka, India.
| | | | | |
Collapse
|
13
|
Kannan B, Castelino K, Chen FF, Majumdar A. Lithographic techniques and surface chemistries for the fabrication of PEG-passivated protein microarrays. Biosens Bioelectron 2006; 21:1960-7. [PMID: 16457998 PMCID: PMC2757004 DOI: 10.1016/j.bios.2005.09.018] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2005] [Revised: 09/19/2005] [Accepted: 09/26/2005] [Indexed: 11/18/2022]
Abstract
This article presents a new technique to fabricate patterns of functional molecules surrounded by a coating of the inert poly(ethylene glycol) (PEG) on glass slides for applications in protein microarray technology. The chief advantages of this technique are that it is based entirely on standard lithography processes, makes use of glass slides employing surface chemistries that are standard in the microarray community, and has the potential to massively scale up the density of microarray spots. It is shown that proteins and antibodies can be made to self-assemble on the functional patterns in a microarray format, with the PEG coating acting as an effective passivating agent to prevent non-specific protein adsorption. Various standard surface chemistries such as aldehyde, epoxy and amine are explored for the functional layer, and it is conclusively demonstrated that only an amine-terminated surface satisfies all the process constraints imposed by the lithography process sequence. The effectiveness of this microarray technology is demonstrated by patterning fluorescent streptavidin and a fluorescent secondary antibody using the well-known and highly specific interaction between biotin and streptavidin.
Collapse
Affiliation(s)
- Balaji Kannan
- Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA.
| | | | | | | |
Collapse
|
14
|
Kalappanavar NK, Bidhu P, Kannan B, Devanand M, Chidanand S. Jeune thoracic dystrophy with right sided diaphragmatic hernia. Indian J Pediatr 2005; 72:269. [PMID: 15812132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
Abstract
Jeune thoracic dystrophy is a rare autosomal recessive chondrodysplasia, first described by Jeune et al in 1955. Early death is usually the consequence of asphyxia with or without pneumonia. Here is reported a newborn with Jeune thoracic dystrophy and a right-sided diaphragmatic hernia.
Collapse
|
15
|
Castelino K, Kannan B, Majumdar A. Characterization of grafting density and binding efficiency of DNA and proteins on gold surfaces. Langmuir 2005; 21:1956-1961. [PMID: 15723495 DOI: 10.1021/la047943k] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The surface grafting density of biomolecules is an important factor for quantitative assays using a wide range of biological sensors. We use a fluorescent measurement technique to characterize the immobilization density of thiolated probe DNA on gold and hybridization efficiency of target DNA as a function of oligonucleotide length and salt concentration. The results indicate the dominance of osmotic and hydration forces in different regimes of salt concentration, which was used to validate previous simulations and to optimize the performance of surface-stress based microcantilever biosensors. The difference in hybridization density between complementary and mismatched target sequences was also measured to understand the response of these sensors in base-pair mismatch detection experiments. Finally, two different techniques for immobilizing proteins on gold were considered and the surface densities obtained in both cases were compared.
Collapse
Affiliation(s)
- Kenneth Castelino
- Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA
| | | | | |
Collapse
|
16
|
|
17
|
Gerion D, Chen F, Kannan B, Fu A, Parak WJ, Chen DJ, Majumdar A, Alivisatos AP. Room-Temperature Single-Nucleotide Polymorphism and Multiallele DNA Detection Using Fluorescent Nanocrystals and Microarrays. Anal Chem 2003; 75:4766-72. [PMID: 14674452 DOI: 10.1021/ac034482j] [Citation(s) in RCA: 255] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report two cDNA microarray-based applications of DNA-nanocrystal conjugates, single-nucleotide polymorphism (SNP) and multiallele detections, using a commercial scanner and two sets of nanocrystals with orthogonal emissions. We focus on SNP mutation detection in the human p53 tumor suppressor gene, which has been found to be mutated in more than 50% of the known human cancers. DNA-nanocrystal conjugates are able to detect both SNP and single-base deletion at room temperature within minutes, with true-to-false signal ratios above 10. We also demonstrate microarray-based multiallele detection, using hybridization of multicolor nanocrystals conjugated to two sequences specific for the hepatitis B and hepatitis C virus, two common viral pathogens that inflict more than 10% of the population in the developing countries worldwide. The simultaneous detection of multiple genetic markers with microarrays and DNA-nanocrystal conjugates has no precedent and suggests the possibility of detecting an even greater number of bacterial or viral pathogens simultaneously.
Collapse
Affiliation(s)
- Daniele Gerion
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Abstract
SKOV-3, NIH:OVCAR-3, NIH:OVCAR-8, Ovca 429 and Ovca 433 ovarian carcinoma cell lines were examined to correlate biological behavior (growth in monolayer and soft agar) with erbB family receptor expression levels and response to recombinant Heregulin beta1 (Hrg). While all lines expressed variable amounts of each receptor, erbB-3 and to a lesser extent erbB-2 were constitutively tyrosine phosphorylated in all lines. Hrg beta1 treatment enhanced only erbB-3 tyrosine phosphorylation; however, the addition of Hrg in low serum did not stimulate ovarian cell growth, unlike all three breast cancer cell lines examined. In addition, all five of the ovarian carcinoma cell lines expressed Hrg mRNA by RT-PCR, unlike two of the three breast cancer cell lines. These results suggest the apparent importance of erbB-3 and endogenous Hrg in ovarian carcinoma cell growth in vitro.
Collapse
Affiliation(s)
- J C Pegues
- Center for Biologics Research and Evaluation, Food and Drug Administration, Bethesda, MD 20892, USA
| | | | | |
Collapse
|
19
|
Gordon AW, Pegues JC, Johnson GR, Kannan B, Auersperg N, Stromberg K. mRNA phenotyping of the major ligands and receptors of the EGF supergene family in human ovarian epithelial cells. Cancer Lett 1995; 89:63-71. [PMID: 7882303 DOI: 10.1016/0304-3835(95)90159-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
mRNA amplification phenotyping (MAPPing) was used to determine the level of mRNA expression of the major EGF-related ligands (EGF, TGF-alpha, and Amphiregulin) and receptors (EGF-receptor and erbB-2) of the EGF supergene family in three ovarian carcinoma lines (OVCA 429 and 433, and NIH:OVCAR-8) under serum-supplemented and reduced serum (minimal medium with 2% fetuin) growth conditions. mRNA levels of TGF-alpha, EGF-R, and erbB-2 were particularly high, and increased approximately 2-3 orders of magnitude when grown in serum, consistent with an autocrine involvement of these genes in ovarian epithelial growth in vitro. Moreover, even when grown without serum, OVCA 429 and NIH:OVCAR-8 expressed elevated levels of mRNA for erbB-2.
Collapse
Affiliation(s)
- A W Gordon
- Division of Cytokine Biology, Center for Biologics Research and Evaluation, Food and Drug Administration, FDA/CBER, Bethesda, MD 20892
| | | | | | | | | | | |
Collapse
|
20
|
Cheng JC, Frackelton AR, Bearer EL, Kumar PS, Kannan B, Santos-Moore A, Rifai A, Settleman J, Clark JW. Changes in tyrosine-phosphorylated p190 and its association with p120 type I and p100 type II rasGAPs during myelomonocytic differentiation of human leukemic cells. Cell Growth Differ 1995; 6:139-48. [PMID: 7756172 PMCID: PMC3376091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A M(r) 190,000 protein (p190) functions as a GTPase-activating protein (GAP) for Rho and Rac family proteins, which are involved in regulating cytoskeletal actin and membrane ruffling. Tyrosine-phosphorylated p190 also complexes with rasGAP, a regulator of Ras activity, thus possibly linking Ras and Rho pathways. Leukemic cells induced to differentiate along myelomonocytic lineages have increased filamentous actin (as evidenced by phalloidin staining) and extended pseudopodia, and become irregularly shaped and flattened, suggesting altered Rho and Rac function. We, therefore, hypothesized that changes in p190 and its association with rasGAP are an integral part of these shape changes. During phorbol 13-myristate 25-acetate-induced monocytic differentiation of HL60 promyelocytic and RWLeu4 chronic myelogenous leukemic cells, the total amount of p190 decreases rapidly but returns to initial levels by 12 h. In RWLeu4, this was accompanied by commensurate changes in p190 tyrosine phosphorylation and association with p120 type I rasGAP. Association of p190 and type I rasGAP was demonstrated by immunoprecipitation with antibodies to either protein. An additional band at M(r) 100,000 (p100) was detected in immunoprecipitates after 12 h of phorbol 13-myristate 25-acetate treatment. Reverse transcription-PCR and immunoblot analyses suggest that p100 is type II rasGAP, an alternatively spliced product of p120 type I rasGAP. p100 was expressed only in response to direct protein kinase C activators, but all classes of differentiation agents increased tyrosine-phosphorylated p190. Rho and Rac are known to be involved in regulating actin polymerization. The results presented here show that the association of p190 with type I rasGAP parallels increases in actin polymerization and cell adhesion. This suggests a role for p190-rasGAP interactions in phorbol 13-myristate 25-acetate-induced cytoskeletal reorganization.
Collapse
Affiliation(s)
- J C Cheng
- Division of Molecular and Cellular Biology, Brown University, Providence, Rhode Island 02908, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Stromberg K, Johnson GR, O'Connor DM, Sorensen CM, Gullick WJ, Kannan B. Frequent immunohistochemical detection of EGF supergene family members in ovarian carcinogenesis. Int J Gynecol Pathol 1994; 13:342-7. [PMID: 7814196 DOI: 10.1097/00004347-199410000-00008] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Primary and metastatic ovarian cystadenocarcinomas, carcinomas of low malignant potential (borderline tumors), benign ovarian cystadenomas, and normal ovaries were compared for immunoperoxidase detection of the ligands epidermal growth factor (EGF), transforming growth factor-alpha (TGF-alpha), amphiregulin (AR), cripto, and the receptors, epidermal growth factor receptor (EGF-R), and c-erbB-2. This matrix analysis of these EGF family members indicated no specific pattern of ligand or receptor expression with a specific ovarian histologic category except in the case of AR and TGF-alpha. AR was detected almost exclusively in borderline tumors, suggesting that these tumors may not arise as a pathological continuum between benign cystadenomas and invasive cystadenocarcinomas. Second, the presence of TGF-alpha immunoreactivity in the absence of coexpression of cripto or EGF appeared to be associated only with adenocarcinomas of high grade and stage.
Collapse
Affiliation(s)
- K Stromberg
- Laboratory of Cell Biology, Food and Drug Administration, Bethesda, Maryland 20892
| | | | | | | | | | | |
Collapse
|
22
|
Johnson GR, Kannan B, Shoyab M, Stromberg K. Amphiregulin induces tyrosine phosphorylation of the epidermal growth factor receptor and p185erbB2. Evidence that amphiregulin acts exclusively through the epidermal growth factor receptor at the surface of human epithelial cells. J Biol Chem 1993; 268:2924-31. [PMID: 7679104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The COOH-terminal half of the amphiregulin (AR) molecule has sequence homology to epidermal growth factor (EGF). The ability of AR to elicit in vivo phosphorylation of the EGF receptor (EGFR) and p185erbB2 was studied in four human epithelial cell lines which expressed either or both of the receptor tyrosine kinases. AR induced the phosphorylation of the EGFR and p185erbB2, and phosphoamino acid analysis revealed enhanced phosphorylation of tyrosine residues in both receptor proteins. A monoclonal antibody (mAb) which binds to the extracellular domain of the EGFR blocked the phosphorylation of the EGFR and p185erbB2 as well as AR-induced mitogenesis indicating that the EGFR mediated these responses. In MDA-MB-453 cells which lack EGFRs, AR did not induce phosphorylation of p185erbB2, did not affect proliferation, and had no detectable effect on the phosphorylation of cellular proteins isolated using an anti-phosphotyrosine mAb. Qualitatively, in vivo phosphorylations induced by AR and EGF were found to be indistinguishable as demonstrated by analysis of cellular 32P-labeled proteins isolated with the anti-phosphotyrosine mAb. Moreover, in the presence of the anti-EGFR mAb, AR had no effect on the proliferation of cells. These results provide strong evidence that the EGFR is the sole cell surface mediator of the action of AR in human epithelial cells.
Collapse
Affiliation(s)
- G R Johnson
- Laboratory of Cell Biology, Food and Drug Administration, Bethesda, Maryland 20892
| | | | | | | |
Collapse
|
23
|
Abstract
An aberrantly expressed and highly active abl tyrosine kinase (p210bcr-abl) appears critical for the development and pathogenesis of chronic myelogenous-leukemia (CML). CML cells and cell lines each displayed a similar spectrum of phosphotyrosyl proteins. Analysis of these proteins by glycerol-gradient ultracentrifugation showed that many apparently existed as multimeric complexes. Confirming this, several of these proteins co-immunoprecipitated, along with the p210bcr-abl, with antibody to abl. Included were co-precipitating proteins identified as the p120 ras GTPase-activating protein (GAP) and the p62 protein that binds both to GAP and to a number of other tyrosine-phosphorylated proteins having peptide regions homologous to the second domain of src. Because p62, ras GAP and ras are involved in growth-factor and oncogene activation of cells, this pathway may also play an important role in CML.
Collapse
MESH Headings
- Fusion Proteins, bcr-abl/genetics
- Fusion Proteins, bcr-abl/metabolism
- GTPase-Activating Proteins
- Gene Expression Regulation, Leukemic
- Humans
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Neoplasm Proteins/isolation & purification
- Phosphoproteins/isolation & purification
- Phosphorylation
- Phosphotyrosine
- Precipitin Tests
- Protein-Tyrosine Kinases/genetics
- Protein-Tyrosine Kinases/metabolism
- Proteins/metabolism
- Tumor Cells, Cultured
- Tyrosine/analogs & derivatives
- Tyrosine/analysis
- Ultracentrifugation
- ras GTPase-Activating Proteins
Collapse
Affiliation(s)
- A R Frackelton
- Department of Medicine, Brown University and Roger Williams Medical Center, Province, Rhode Island 02908
| | | | | | | |
Collapse
|
24
|
Lupu R, Colomer R, Kannan B, Lippman ME. Characterization of a growth factor that binds exclusively to the erbB-2 receptor and induces cellular responses. Proc Natl Acad Sci U S A 1992; 89:2287-91. [PMID: 1347947 PMCID: PMC48642 DOI: 10.1073/pnas.89.6.2287] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The erbB-2 oncogene encodes a 185-kDa transmembrane protein that has been suggested to be a growth factor receptor. We have previously identified and purified a 30-kDa growth factor (gp30) that is a ligand for the p185erbB-2 protein that at high concentrations induces growth inhibition of cells with erbB-2 amplification. We now report the purification and characterization of a protein from SKBr-3 human breast cancer cells with a molecular mass of 75 kDa (p75) that is a p185erbB-2 ligand. An affinity column coupled to the extracellular domain of p185erbB-2 was used for the purification. We found that p75 induced tyrosine phosphorylation of the erbB-2 oncoprotein, as determined by in vivo and in vitro phosphorylation and phosphoamino acid analysis. p75, as well as gp30, stimulated cell proliferation and colony formation of cells overexpressing erbB-2. The specificity of this effect was confirmed by showing that the antiproliferative effects of soluble erbB-2 extracellular domain were reversed by either p75 or gp30. p75 did not show binding to the epidermal growth factor receptor and had no growth effects on cells overexpressing epidermal growth factor receptor. These data show that SKBR-3 cells, which exhibit erbB-2 amplification and overexpression, secrete a growth factor that binds and activates p185erbB-2 specifically.
Collapse
Affiliation(s)
- R Lupu
- Vincent T. Lombardi Cancer Research Center, Georgetown University Medical Center, Washington, DC 20007
| | | | | | | |
Collapse
|
25
|
Frackelton AR, Posner M, Kannan B, Mermelstein F. Generation of monoclonal antibodies against phosphotyrosine and their use for affinity purification of phosphotyrosine-containing proteins. Methods Enzymol 1991; 201:79-92. [PMID: 1719350 DOI: 10.1016/0076-6879(91)01010-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|