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15 pages, 263 KiB

Open AccessArticle

A Logistic Regression Model for Predicting Axillary Lymph Node Metastases in Early Breast Carcinoma Patients

by Fei Xie, Houpu Yang, Shu Wang, Bo Zhou, Fuzhong Tong, Deqi Yang and Jiaqing Zhang

Sensors 2012, 12(7), 9936-9950; https://doi.org/10.3390/s120709936 - 23 Jul 2012

Cited by 38 | Viewed by 8405

Abstract

Nodal staging in breast cancer is a key predictor of prognosis. This paper presents the results of potential clinicopathological predictors of axillary lymph node involvement and develops an efficient prediction model to assist in predicting axillary lymph node metastases. Seventy patients with primary [...] Read more.

Nodal staging in breast cancer is a key predictor of prognosis. This paper presents the results of potential clinicopathological predictors of axillary lymph node involvement and develops an efficient prediction model to assist in predicting axillary lymph node metastases. Seventy patients with primary early breast cancer who underwent axillary dissection were evaluated. Univariate and multivariate logistic regression were performed to evaluate the association between clinicopathological factors and lymph node metastatic status. A logistic regression predictive model was built from 50 randomly selected patients; the model was also applied to the remaining 20 patients to assess its validity. Univariate analysis showed a significant relationship between lymph node involvement and absence of nm-23 (p = 0.010) and Kiss-1 (p = 0.001) expression. Absence of Kiss-1 remained significantly associated with positive axillary node status in the multivariate analysis (p = 0.018). Seven clinicopathological factors were involved in the multivariate logistic regression model: menopausal status, tumor size, ER, PR, HER2, nm-23 and Kiss-1. The model was accurate and discriminating, with an area under the receiver operating characteristic curve of 0.702 when applied to the validation group. Moreover, there is a need discover more specific candidate proteins and molecular biology tools to select more variables which should improve predictive accuracy. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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12 pages, 938 KiB

Open AccessArticle

Novel Biochip Platform for Nucleic Acid Analysis

by Salvatore Pernagallo, Giorgio Ventimiglia, Claudia Cavalluzzo, Enrico Alessi, Hugh Ilyine, Mark Bradley and Juan J. Diaz-Mochon

Sensors 2012, 12(6), 8100-8111; https://doi.org/10.3390/s120608100 - 11 Jun 2012

Cited by 34 | Viewed by 12978

Abstract

This manuscript describes the use of a novel biochip platform for the rapid analysis/identification of nucleic acids, including DNA and microRNAs, with very high specificity. This approach combines a unique dynamic chemistry approach for nucleic acid testing and analysis developed by DestiNA Genomics [...] Read more.

This manuscript describes the use of a novel biochip platform for the rapid analysis/identification of nucleic acids, including DNA and microRNAs, with very high specificity. This approach combines a unique dynamic chemistry approach for nucleic acid testing and analysis developed by DestiNA Genomics with the STMicroelectronics In-Check platform, which comprises two microfluidic optimized and independent PCR reaction chambers, and a sequential microarray area for nucleic acid capture and identification by fluorescence. With its compact bench-top “footprint” requiring only a single technician to operate, the biochip system promises to transform and expand routine clinical diagnostic testing and screening for genetic diseases, cancers, drug toxicology and heart disease, as well as employment in the emerging companion diagnostics market. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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12 pages, 334 KiB

Open AccessArticle

Glycopeptide-Based Antibody Detection in Multiple Sclerosis by Surface Plasmon Resonance

by Feliciana Real-Fernández, Irene Passalacqua, Elisa Peroni, Mario Chelli, Francesco Lolli, Anna Maria Papini and Paolo Rovero

Sensors 2012, 12(5), 5596-5607; https://doi.org/10.3390/s120505596 - 2 May 2012

Cited by 34 | Viewed by 8822

Abstract

In multiple sclerosis (MS) the gold standard for the diagnosis and prognosis is, up to now, the use of magnetic resonance imaging markers. No alternative simpler assays proven of use, except for cerebrospinal fluid analysis, have been provided in MS diagnosis. Therefore, there [...] Read more.

In multiple sclerosis (MS) the gold standard for the diagnosis and prognosis is, up to now, the use of magnetic resonance imaging markers. No alternative simpler assays proven of use, except for cerebrospinal fluid analysis, have been provided in MS diagnosis. Therefore, there is a need to develop non-invasive, sensitive, simple new techniques for the clinical routine. Herein we present the evaluation of the feasibility of a glycopeptide-based biosensor to detect MS specific antibodies in sera using the surface plasmon resonance technology. The previously described glycopeptide antigen CSF114(Glc) has been immobilized on a gold sensor chip and the method has been optimized for real-time specific autoantibody detection directly in sera. A population of 60 healthy blood donors and 61 multiple sclerosis patients has been screened. The receiver operating characteristic (ROC)-based analysis has established the optimal diagnostic cut-off value for the method obtaining a sensitivity of 36% and a specificity of 95%. Sample sera have been also screened with a previously validated ELISA. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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10 pages, 176 KiB

Open AccessArticle

The Release of Immunosuppressive Factor(s) in Young Males Following Exercise

by Ye Tian, Jinlei Nie, Tom K. Tong and Julien S. Baker

Sensors 2012, 12(5), 5586-5595; https://doi.org/10.3390/s120505586 - 2 May 2012

Cited by 2 | Viewed by 6440

Abstract

It has been shown that a suppressive protein, acting as an immune suppressor, is generated in animals and humans under particular stresses. However, studies related to immunosuppressive factors in response to the stress resulting from acute exercise are limited. This study compares the [...] Read more.

It has been shown that a suppressive protein, acting as an immune suppressor, is generated in animals and humans under particular stresses. However, studies related to immunosuppressive factors in response to the stress resulting from acute exercise are limited. This study compares the effects of pre- and post-exercise human serum on concanavalin A stimulated lymphocyte proliferation of mice. In the present study, blood samples in eight male undergraduates (age 21 ± 0.7 years) were taken before and immediately after ten sets of exercise consisting of 15 free and 30 10-kg loaded squat jumps in each set. The suppression of lymphocyte proliferation was analysed with high pressure liquid chromatography. It was noted from the result of gel chromatography columns that the post-exercise values of the suppression of lymphocyte proliferation, in comparison to corresponding pre-exercise values, were generally greater with significant differences observed in 7.5th–9th min post-exercise eluates (P < 0.05). Such findings suggest that intense eccentric type exercise may lead to generation of immunosuppressive factor(s) in young males. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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14 pages, 470 KiB

Open AccessArticle

A Novel “Reactomics” Approach for Cancer Diagnostics

by Sofiya Kolusheva, Rami Yossef, Aleksandra Kugel, Nirit Hanin-Avraham, Meital Cohen, Eitan Rubin and Angel Porgador

Sensors 2012, 12(5), 5572-5585; https://doi.org/10.3390/s120505572 - 2 May 2012

Cited by 4 | Viewed by 6648

Abstract

Non-invasive detection and monitoring of lethal diseases, such as cancer, are considered as effective factors in treatment and survival. We describe a new disease diagnostic approach, denoted “reactomics”, based upon reactions between blood sera and an array of vesicles comprising different [...] Read more.

Non-invasive detection and monitoring of lethal diseases, such as cancer, are considered as effective factors in treatment and survival. We describe a new disease diagnostic approach, denoted “reactomics”, based upon reactions between blood sera and an array of vesicles comprising different lipids and polydiacetylene (PDA), a chromatic polymer. We show that reactions between sera and such a lipid/PDA vesicle array produce chromatic patterns which depend both upon the sera composition as well as the specific lipid constituents within the vesicles. The chromatic patterns were processed through machine-learning algorithms, and the bioinformatics analysis could distinguish both between cancer-bearing and healthy patients, respectively, as well between two types of cancers. Size-separation and enzymatic digestion experiments indicate that lipoproteins are the primary components in sera which react with the chromatic biomimetic vesicles. This colorimetric reactomics concept is highly generic, robust, and does not require a priori knowledge upon specific disease markers in sera. Therefore, it could be employed as complementary or alternative approach for disease diagnostics. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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12 pages, 511 KiB

Open AccessArticle

Clinical Application of Surface Plasmon Resonance-Based Biosensors for Fetal Fibronectin Detection

by Chen-Yu Chen, Chia-Chen Chang, Chun Yu and Chii-Wann Lin

Sensors 2012, 12(4), 3879-3890; https://doi.org/10.3390/s120403879 - 26 Mar 2012

Cited by 21 | Viewed by 8507

Abstract

Preterm birth is the leading cause of perinatal morbidity and mortality. Fetal fibronectin (fFN), a glycoprotein in the extracellular matrix of the amniotic membranes, is the most powerful biomarker for predicting the risk of preterm birth. Biosensors using the surface plasmon resonance (SPR) [...] Read more.

Preterm birth is the leading cause of perinatal morbidity and mortality. Fetal fibronectin (fFN), a glycoprotein in the extracellular matrix of the amniotic membranes, is the most powerful biomarker for predicting the risk of preterm birth. Biosensors using the surface plasmon resonance (SPR) response are potentially useful in quantitatively measuring molecules. We established a standard calibration curve of SPR intensity against fFN concentration and used the SPR-based biosensor to detect fFN concentrations in the cervicovaginal secretions of pregnant women between 22 and 34 weeks of gestation. The calibration curve extends from 0.5 ng/mL to 100 ng/mL with an excellent correlation (R² = 0.985) based on standard fFN samples. A cutoff value of 50 ng/mL fFN concentration in commercial ELISA kits corresponds to a relative intensity of 17 arbitrary units (a.u.) in SPR. Thirty-two pregnant women were analyzed in our study. In 11 women, the SPR relative intensity was greater than or equal to 17 a.u., and in 21 women, the SPR relative intensity was less than 17 a.u. There were significant differences between the two groups in regular uterine contractions (p = 0.040), hospitalization for tocolysis (p = 0.049), and delivery weeks (p = 0.043). Our prospective study concluded that SPR-based biosensors can quantitatively measure fFN concentrations. These results reveal the potential utility of SPR-based biosensors in predicting the risk of preterm birth. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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17 pages, 240 KiB

Open AccessArticle

Serological Thymidine Kinase 1 is a Biomarker for Early Detection of Tumours—A Health Screening Study on 35,365 People, Using a Sensitive Chemiluminescent Dot Blot Assay

by Zhi Heng Chen, Shou Qing Huang, Yande Wang, Ai Zhen Yang, Jian Wen, Xiao Hong Xu, Yan Chen, Qu Bo Chen, Ying Hong Wang, Ellen He, Ji Zhou and Sven Skog

Sensors 2011, 11(12), 11064-11080; https://doi.org/10.3390/s111211064 - 28 Nov 2011

Cited by 42 | Viewed by 10818

Abstract

Serological thymidine kinase 1 (STK1) is a reliable proliferation marker for prognosis, monitoring tumour therapy, and relapse. Here we investigated the use of STK1 in health screening for early detection of pre-malignant and malignant diseases. The investigation was based on 35,365 participants in [...] Read more.

Serological thymidine kinase 1 (STK1) is a reliable proliferation marker for prognosis, monitoring tumour therapy, and relapse. Here we investigated the use of STK1 in health screening for early detection of pre-malignant and malignant diseases. The investigation was based on 35,365 participants in four independent health screening studies in China between 2005–2011. All participants were clinically examined. The concentration of STK1 was determined by a sensitive chemiluminescent dot blot ECL assay. The ROCvalue of the STK1 assay was 0.96. At a cut-off STK1 value of 2.0 pM, the likelihood (+) value was 236.5, and the sensitivity and the specificity were 0.78 and 0.99, respectively. The relative number of city-dwelling people with elevated STK1 values (≥2.0 pM) was 0.8% (198/26,484), while the corresponding value for the group of oil-field workers was 5.8% (514/8,355). The latter group expressed significantly higher frequency of refractory anaemia, fatty liver, and obesity, compared to the city dwellers, but no cases of breast hyperplasia or prostate hyperplasia. Furthermore, people working in oil drilling/oil transportation showed higher STK1 values and higher frequency of pre-malignancies and benign diseases than people working in the oil-field administration. In the STK1 elevated group of the city-dwelling people, a statistically significantly higher number of people were found to have malignancies, pre-malignancies of all types, moderate/severe type of hyperplasia of breast or prostate, or refractory anaemia, or to be at high risk for hepatitis B, compared to people with normal STK1 values (< 2.0 pM). No malignancies were found in the normal STK1 group. In the elevated STK1 group 85.4% showed diseases linked to a higher risk for pre-/early cancerous progression, compared to 52.4% of those with normal STK1 values. Among participants with elevated STK1 values, 8.8% developed new malignancies or progress in their pre-malignancies within 5 to 72 months, compared to 0.2% among people with normal STK1 values. People who showed elevated STK1 values were at about three to five times higher risk to develop malignancies compared to a calculated risk based on a cancer incidence rate of 0.2–0.3%. We conclude that serological TK1 protein concentration is a reliable marker for risk assessment of pre/early cancerous progression. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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Review

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14 pages, 212 KiB

Open AccessReview

Circulating MicroRNAs: Molecular Microsensors in Gastrointestinal Cancer

by Moisés Blanco-Calvo, Lourdes Calvo, Angélica Figueroa, Mar Haz-Conde, Luis Antón-Aparicio and Manuel Valladares-Ayerbes

Sensors 2012, 12(7), 9349-9362; https://doi.org/10.3390/s120709349 - 9 Jul 2012

Cited by 36 | Viewed by 7898

Abstract

MicroRNAs (miRNAs) are small molecules of single strand non-coding RNAs, which are able to regulate gene expression. miRNAs have been involved in multiple cellular processes, such as proliferation, apoptosis and differentiation, thus alterations in miRNA expression have been shown to be directly linked [...] Read more.

MicroRNAs (miRNAs) are small molecules of single strand non-coding RNAs, which are able to regulate gene expression. miRNAs have been involved in multiple cellular processes, such as proliferation, apoptosis and differentiation, thus alterations in miRNA expression have been shown to be directly linked with the pathological origin of multiple diseases, including cancer. In this way, during last few years, an increasing number of exciting advances have contributed to the understanding of miRNA roles in cancer. Moreover, researchers have exploited the special characteristics of miRNAs, such as the tissue and disease specificity or miRNA presence in blood, to explore their use as non-invasive tumour markers. In the present review, we summarize the current data on the potential usefulness of circulating miRNAs as diagnostic and prognostic tools in gastrointestinal tumours. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

21 pages, 379 KiB

Open AccessReview

Study Designs and Statistical Analyses for Biomarker Research

by Masahiko Gosho, Kengo Nagashima and Yasunori Sato

Sensors 2012, 12(7), 8966-8986; https://doi.org/10.3390/s120708966 - 29 Jun 2012

Cited by 68 | Viewed by 12686

Abstract

Biomarkers are becoming increasingly important for streamlining drug discovery and development. In addition, biomarkers are widely expected to be used as a tool for disease diagnosis, personalized medication, and surrogate endpoints in clinical research. In this paper, we highlight several important aspects related [...] Read more.

Biomarkers are becoming increasingly important for streamlining drug discovery and development. In addition, biomarkers are widely expected to be used as a tool for disease diagnosis, personalized medication, and surrogate endpoints in clinical research. In this paper, we highlight several important aspects related to study design and statistical analysis for clinical research incorporating biomarkers. We describe the typical and current study designs for exploring, detecting, and utilizing biomarkers. Furthermore, we introduce statistical issues such as confounding and multiplicity for statistical tests in biomarker research. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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15 pages, 241 KiB

Open AccessReview

Biomarkers for Use in Monitoring Responses of Nasopharyngeal Carcinoma Cells to Ionizing Radiation

by Wei Gao, John Zenghong Li, Wai Kuen Ho, Jimmy Yuwai Chan and Thian Sze Wong

Sensors 2012, 12(7), 8832-8846; https://doi.org/10.3390/s120708832 - 27 Jun 2012

Cited by 16 | Viewed by 7600

Abstract

Nasopharyngeal carcinoma (NPC) is a common head and neck cancer. The incidence rate is higher in southern China and Southeast Asia in comparison with the Western countries. Radiotherapy is the standard treatment of NPC as the cancer cells are sensitive to ionizing radiation. [...] Read more.

Nasopharyngeal carcinoma (NPC) is a common head and neck cancer. The incidence rate is higher in southern China and Southeast Asia in comparison with the Western countries. Radiotherapy is the standard treatment of NPC as the cancer cells are sensitive to ionizing radiation. Radiation treatment has good local control to patients with early NPC. It is essential to monitor the response of the NPC cells to radiation treatment in advance in order to select suitable treatment choice for the patients. This review aims to discuss the potential use of biomarkers in monitoring the responsiveness of NPC cells to radiation treatment. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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19 pages, 3895 KiB

Open AccessReview

Diagnostic Devices for Isothermal Nucleic Acid Amplification

by Chia-Chen Chang, Chien-Cheng Chen, Shih-Chung Wei, Hui-Hsin Lu, Yang-Hung Liang and Chii-Wann Lin

Sensors 2012, 12(6), 8319-8337; https://doi.org/10.3390/s120608319 - 14 Jun 2012

Cited by 123 | Viewed by 17438

Abstract

Since the development of the polymerase chain reaction (PCR) technique, genomic information has been retrievable from lesser amounts of DNA than previously possible. PCR-based amplifications require high-precision instruments to perform temperature cycling reactions; further, they are cumbersome for routine clinical use. However, the [...] Read more.

Since the development of the polymerase chain reaction (PCR) technique, genomic information has been retrievable from lesser amounts of DNA than previously possible. PCR-based amplifications require high-precision instruments to perform temperature cycling reactions; further, they are cumbersome for routine clinical use. However, the use of isothermal approaches can eliminate many complications associated with thermocycling. The application of diagnostic devices for isothermal DNA amplification has recently been studied extensively. In this paper, we describe the basic concepts of several isothermal amplification approaches and review recent progress in diagnostic device development. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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18 pages, 344 KiB

Open AccessReview

Optical Oxygen Micro- and Nanosensors for Plant Applications

by Cindy Ast, Elmar Schmälzlin, Hans-Gerd Löhmannsröben and Joost T. Van Dongen

Sensors 2012, 12(6), 7015-7032; https://doi.org/10.3390/s120607015 - 25 May 2012

Cited by 59 | Viewed by 15111

Abstract

Pioneered by Clark’s microelectrode more than half a century ago, there has been substantial interest in developing new, miniaturized optical methods to detect molecular oxygen inside cells. While extensively used for animal tissue measurements, applications of intracellular optical oxygen biosensors are still scarce [...] Read more.

Pioneered by Clark’s microelectrode more than half a century ago, there has been substantial interest in developing new, miniaturized optical methods to detect molecular oxygen inside cells. While extensively used for animal tissue measurements, applications of intracellular optical oxygen biosensors are still scarce in plant science. A critical aspect is the strong autofluorescence of the green plant tissue that interferes with optical signals of commonly used oxygen probes. A recently developed dual-frequency phase modulation technique can overcome this limitation, offering new perspectives for plant research. This review gives an overview on the latest optical sensing techniques and methods based on phosphorescence quenching in diverse tissues and discusses the potential pitfalls for applications in plants. The most promising oxygen sensitive probes are reviewed plus different oxygen sensing structures ranging from micro-optodes to soluble nanoparticles. Moreover, the applicability of using heterologously expressed oxygen binding proteins and fluorescent proteins to determine changes in the cellular oxygen concentration are discussed as potential non-invasive cellular oxygen reporters. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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10 pages, 475 KiB

Open AccessReview

Eag1 Channels as Potential Cancer Biomarkers

by Jesús Adrián Rodríguez-Rasgado, Isabel Acuña-Macías and Javier Camacho

Sensors 2012, 12(5), 5986-5995; https://doi.org/10.3390/s120505986 - 10 May 2012

Cited by 46 | Viewed by 9551

Abstract

Cancer is a leading cause of death worldwide. New early tumor markers are needed to treat the disease at curable stages. In addition, new therapeutic targets are required to treat patients not responding to available treatments. Ion channels play major roles in health [...] Read more.

Cancer is a leading cause of death worldwide. New early tumor markers are needed to treat the disease at curable stages. In addition, new therapeutic targets are required to treat patients not responding to available treatments. Ion channels play major roles in health and disease, including cancer. Actually, several ion channels have been suggested as potential tumor markers and therapeutic targets for different types of malignancies. One of most studied ion channels in cancer is the voltage-gated potassium channel Eag1 (ether à go-go 1), which has a high potential to be used as a cancer biomarker. Eag1 is expressed in most human tumors, in contrast to its restricted distribution in healthy tissues. Several findings suggest Eag1 as a potential early marker for cervical, colon, and breast cancer. In addition, because Eag1 amplification/expression is associated with poor survival in leukemia, colon and ovarian cancer patients, it has also been proposed as a prognosis marker. Moreover, inhibition of either expression or activity of Eag1 leads to reduced proliferation of cancer cells, making Eag1 a potential anticancer target. Using Eag1 in cancer detection programs could help to reduce mortality from this disease. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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27 pages, 1227 KiB

Open AccessReview

Electric Field Guided Assembly of One-Dimensional Nanostructures for High Performance Sensors

by Devon A. Brown, Jong-Hoon Kim, Hyun-Boo Lee, Gareth Fotouhi, Kyong-Hoon Lee, Wing Kam Liu and Jae-Hyun Chung

Sensors 2012, 12(5), 5725-5751; https://doi.org/10.3390/s120505725 - 4 May 2012

Cited by 34 | Viewed by 10320

Abstract

Various nanowire or nanotube-based devices have been demonstrated to fulfill the anticipated future demands on sensors. To fabricate such devices, electric field-based methods have demonstrated a great potential to integrate one-dimensional nanostructures into various forms. This review paper discusses theoretical and experimental aspects [...] Read more.

Various nanowire or nanotube-based devices have been demonstrated to fulfill the anticipated future demands on sensors. To fabricate such devices, electric field-based methods have demonstrated a great potential to integrate one-dimensional nanostructures into various forms. This review paper discusses theoretical and experimental aspects of the working principles, the assembled structures, and the unique functions associated with electric field-based assembly. The challenges and opportunities of the assembly methods are addressed in conjunction with future directions toward high performance sensors. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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11 pages, 203 KiB

Open AccessReview

HPV-Associated Head and Neck Cancer: Molecular and Nano-Scale Markers for Prognosis and Therapeutic Stratification

by Adam J. Kimple, Alexandra D. Torres, Robert Z. Yang and Randall J. Kimple

Sensors 2012, 12(4), 5159-5169; https://doi.org/10.3390/s120405159 - 20 Apr 2012

Cited by 15 | Viewed by 8185

Abstract

Over the last 10 years, it has become clear that patients with head and neck cancer can be stratified into two distinct subgroups on the basis of the etiology of their disease. Patients with human papillomavirus-related cancers have significantly better survival rates and [...] Read more.

Over the last 10 years, it has become clear that patients with head and neck cancer can be stratified into two distinct subgroups on the basis of the etiology of their disease. Patients with human papillomavirus-related cancers have significantly better survival rates and may necessitate different therapeutic approaches than those with tobacco and/or alcohol related cancers. This review discusses the various biomarkers currently in use for identification of patients with HPV-positive cancers with a focus on the advantages and limitations of molecular and nano-scale markers. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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12 pages, 294 KiB

Open AccessReview

Endogenous Bioactive Peptides as Potential Biomarkers for Atherosclerotic Coronary Heart Disease

by Takuya Watanabe, Kengo Sato, Fumiko Itoh, Kohei Wakabayashi, Masayoshi Shichiri and Tsutomu Hirano

Sensors 2012, 12(4), 4974-4985; https://doi.org/10.3390/s120404974 - 18 Apr 2012

Cited by 23 | Viewed by 8268

Abstract

Cardiovascular disease is the leading cause of death worldwide, with high medical costs and rates of disability. It is therefore important to evaluate the use of cardiovascular biomarkers in the early diagnosis of coronary artery disease (CAD). We have screened a variety of [...] Read more.

Cardiovascular disease is the leading cause of death worldwide, with high medical costs and rates of disability. It is therefore important to evaluate the use of cardiovascular biomarkers in the early diagnosis of coronary artery disease (CAD). We have screened a variety of recently identified bioactive peptides candidates in anticipation that they would allow detection of atherosclerotic CAD. Especially, we have focused on novel anti-atherogenic peptides as indicators and negative risk factors for CAD. In vitro, in vivo and clinical studies indicated that human adiponectin, heregulin-β₁, glucagon-like peptide-1 (GLP-1), and salusin-α, peptides of 244, 71, 30, and 28 amino acids, respectively, attenuate the development and progression of atherosclerotic lesions by suppressing macrophage foam cell formation via down-regulation of acyl-coenzyme A: cholesterol acyltransferase-1. Circulating levels of these peptides in the blood are significantly decreased in patients with CAD compared to patients without CAD. Receiver operating characteristic analyses showed that salusin-α is a more useful biomarker, with better sensitivity and specificity, compared with the others for detecting CAD. Therefore, salusin-α, heregulin-β₁, adiponectin, and/or GLP-1, alone or in various combinations, may be useful as biomarkers for atherosclerotic CAD. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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11 pages, 166 KiB

Open AccessReview

Circulating microRNAs as Biomarkers, Therapeutic Targets, and Signaling Molecules

by Seena K. Ajit

Sensors 2012, 12(3), 3359-3369; https://doi.org/10.3390/s120303359 - 8 Mar 2012

Cited by 152 | Viewed by 13162

Abstract

Small noncoding microRNAs (miRNAs) are important regulators of post-transcriptional gene regulation and have altered the prevailing view of a linear relationship between gene and protein expression. Aberrant miRNA expression is an emerging theme for a wide variety of diseases, highlighting the fundamental role [...] Read more.

Small noncoding microRNAs (miRNAs) are important regulators of post-transcriptional gene regulation and have altered the prevailing view of a linear relationship between gene and protein expression. Aberrant miRNA expression is an emerging theme for a wide variety of diseases, highlighting the fundamental role played by miRNAs in both physiological and pathological states. The identification of stable miRNAs in bodily fluids paved the way for their use as novel biomarkers amenable to clinical diagnosis in translational medicine. Identification of miRNAs in exosomes that are functional upon delivery to the recipient cells has highlighted a novel method of intercellular communication. Delivery of miRNAs to recipient cells via blood, with functional gene regulatory consequences, opens up novel avenues for target intervention. Exosomes thus offer a novel strategy for delivering drugs or RNA therapeutic agents. Though much work lies ahead, circulating miRNAs are unequivocally ushering in a new era of novel biomarker discovery, intercellular communication mechanisms, and therapeutic intervention strategies. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

25 pages, 611 KiB

Open AccessReview

Biomarker Discovery by Novel Sensors Based on Nanoproteomics Approaches

by Noelia Dasilva, Paula Díez, Sergio Matarraz, María González-González, Sara Paradinas, Alberto Orfao and Manuel Fuentes

Sensors 2012, 12(2), 2284-2308; https://doi.org/10.3390/s120202284 - 16 Feb 2012

Cited by 53 | Viewed by 11330

Abstract

During the last years, proteomics has facilitated biomarker discovery by coupling high-throughput techniques with novel nanosensors. In the present review, we focus on the study of label-based and label-free detection systems, as well as nanotechnology approaches, indicating their advantages and applications in biomarker [...] Read more.

During the last years, proteomics has facilitated biomarker discovery by coupling high-throughput techniques with novel nanosensors. In the present review, we focus on the study of label-based and label-free detection systems, as well as nanotechnology approaches, indicating their advantages and applications in biomarker discovery. In addition, several disease biomarkers are shown in order to display the clinical importance of the improvement of sensitivity and selectivity by using nanoproteomics approaches as novel sensors. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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20 pages, 922 KiB

Open AccessReview

Aptamers and Their Biological Applications

by Kyung-Mi Song, Seonghwan Lee and Changill Ban

Sensors 2012, 12(1), 612-631; https://doi.org/10.3390/s120100612 - 9 Jan 2012

Cited by 686 | Viewed by 30591

Abstract

Recently, aptamers have attracted the attention of many scientists, because they not only have all of the advantages of antibodies, but also have unique merits, such as thermal stability, low cost, and unlimited applications. In this review, we present the reasons why aptamers [...] Read more.

Recently, aptamers have attracted the attention of many scientists, because they not only have all of the advantages of antibodies, but also have unique merits, such as thermal stability, low cost, and unlimited applications. In this review, we present the reasons why aptamers are known as alternatives to antibodies. Furthermore, several types of in vitro selection processes, including nitrocellulose membrane filtration, affinity chromatography, magnetic bead, and capillary electrophoresis-based selection methods, are explained in detail. We also introduce various applications of aptamers for the diagnosis of diseases and detection of small molecules. Numerous analytical techniques, such as electrochemical, colorimetric, optical, and mass-sensitive methods, can be utilized to detect targets, due to convenient modifications and the stability of aptamers. Finally, several medical and analytical applications of aptamers are presented. In summary, aptamers are promising materials for diverse areas, not just as alternatives to antibodies, but as the core components of medical and analytical equipment. Full article

(This article belongs to the Special Issue Biomarkers and Nanosensors: New Approaches for Biology and Medicine)

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