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5-aminolevulinic acid

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https://www.readbyqxmd.com/read/28454245/improving-contrast-enhancement-in-magnetic-resonance-imaging-using-5-aminolevulinic-acid-induced-protoporphyrin-ix-for-high-grade-gliomas
#1
Junkoh Yamamoto, Shingo Kakeda, Tetsuya Yoneda, Shun-Ichiro Ogura, Shohei Shimajiri, Tohru Tanaka, Yukunori Korogi, Shigeru Nishizawa
Magnetic resonance imaging (MRI) with a gadolinium-based contrast agent is the gold standard for high-grade gliomas (HGGs). The compound 5-aminolevulinic acid (5-ALA) undergoes a high rate of cellular uptake, particularly in cancer cells. In addition, fluorescence-guided resection with 5-ALA is widely used for imaging HGGs. 5-ALA is water soluble, while protoporphyrin IX (PpIX) is water insoluble. It was speculated whether converting from 5-ALA to PpIX may relatively increase intracellular water content, and consequently, might enhance the T2 signal intensity in HGG...
March 2017: Oncology Letters
https://www.readbyqxmd.com/read/28432590/pathological-analysis-of-the-surgical-margins-of-resected-glioblastomas-excised-using-photodynamic-visualization-with-both-5-aminolevulinic-acid-and-fluorescein-sodium
#2
Hirohito Yano, Noriyuki Nakayama, Naoyuki Ohe, Kazuhiro Miwa, Jun Shinoda, Toru Iwama
During glioma resection, 5-aminolevulinic acid (5-ALA) and fluorescein sodium (Fl-Na) are used for photodynamic tumor visualization. The objective of this study was to evaluate the pathological findings of the boundary zone between the tumor and adjacent normal brain in glioblastoma patients undergoing simultaneous double staining with 5-ALA and Fl-Na during surgery. Eight patients received 5-ALA (20 mg/kg orally) before the induction of general anesthesia, and Fl-Na (20 mg/kg) was administered intravenously before the dural incision was performed...
April 21, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28420209/association-between-blood-lead-levels-and-delta-aminolevulinic-acid-dehydratase-in-pregnant-women
#3
Osmel La-Llave-León, Edna M Méndez-Hernández, Francisco X Castellanos-Juárez, Eloísa Esquivel-Rodríguez, Fernando Vázquez-Alaniz, Ada Sandoval-Carrillo, Gonzalo García-Vargas, Jaime Duarte-Sustaita, Jorge L Candelas-Rangel, José M Salas-Pacheco
Blood lead levels (BLLs) and delta-aminolevulinic acid dehydratase (ALAD) activity are considered biomarkers of lead exposure and lead toxicity, respectively. The present study was designed to investigate the association between BLLs and ALAD activity in pregnant women from Durango, Mexico. A total of 633 pregnant women aged 13-43 years participated in this study. Blood lead was measured by a graphite furnace atomic absorption spectrometer. ALAD activity was measured spectrophotometrically. Mean blood lead was 2...
April 18, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28416355/expression-of-coproporphyrinogen-oxidase-is-associated-with-detection-of-upper-gastrointestinal-carcinomas-by-5-aminolevulinic-acid-mediated-photodynamic-diagnosis
#4
Kumi Ogihara, Hajime Isomoto, Hiroki Kurumi, Tsutomu Kanda, Mikiko Hashisako, Kazuhiro Tabata, Hiroyuki Ishii, Ken Ohnita, Naoyuki Yamaguchi, Yuko Akazawa, Kayoko Matsushima, Fuminao Takeshima, Masaki Kunizaki, Shigekazu Hidaka, Atsushi Nanashima, Junya Fukuoka, Takeshi Nagayasu, Kazuhiko Nakao
BACKGROUND: 5-Aminolevulinic acid is a precursor of photosensitizing protoporphyrin IX and has been applied for photodynamic diagnosis of brain and bladder tumors with few side effects. Although most upper gastrointestinal tumors can be detected during photodynamic diagnosis, some tumors containing signet-ring cells cannot be visualized. Here, we aimed to assess whether proteins involved in the absorbance, activation, and turnover of protoporphyrin IX altered the fluorescence signal in gastric cancer...
April 14, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28403266/laser-assisted-photodynamic-therapy-two-novel-protocols-for-enhanced-treatment-results
#5
Mary L Stevenson, Julie K Karen, Elizabeth K Hale
<p>Photodynamic therapy (PDT) uses a topical photosensitizing agent which is activated by a light source to cause destruction of specific cells. Commonly used for the treatment of actinic keratoses and photodamage, PDT can also be used for other conditions including acne and sebaceous hyperplasia. Here we report our experience with two treatment protocols. The first protocol utilizes laser assisted delivery of topical 5-aminolevulinic acid for enhanced efficacy of blue light photodynamic therapy in the treatment of actinic keratoses and photodamage...
April 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28400397/fluorescence-in-a-cryptococcoma-following-administration-of-5-aminolevulinic-acid-hydrochloride-gliolan
#6
Waldo Gerard Solis, Mitchell Hansen
A 54-year-old man presented with two episodes of dysarthria and left facial droop. Both episodes resolved by the time of examination. MRI of the brain revealed a right frontotemporal, heterogeneously enhancing mass with surrounding vasogenic oedema, suggestive of a high-grade primary brain neoplasm. The patient was administered preoperative 5-aminolevulinic acid hydrochloride (Gliolan), and fluorescence-guided resection of the lesion was undertaken. Cryptococcus gattii infection was diagnosed from the specimen and the patient was given appropriate antifungal treatment...
April 11, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28397487/design-and-proof-of-programmed-5-aminolevulinic-acid-prodrug-nanocarriers-for-targeted-photodynamic-cancer-therapy
#7
Jina Wu, Haijie Han, Qiao Jin, Zuhong Li, Huan Li, Jian Ji
5-Aminolevulinic acid (ALA), the precursor of photosensitizer protoporphyrin IX (PpIX), is a U.S. FDA-approved photodynamic therapeutic agent. However, realizing efficient delivery of ALA is still a big challenge as it is hydrophilic and cannot be recognized and selectively accumulated in tumor cells. In this study, matrix metalloproteinase-2 (MMP-2) and pH dual-sensitive ALA prodrug nanocarriers were constructed as a programmed delivery strategy for the targeted delivery of ALA. The nanocarriers were prepared by the co-modification of gold nanoparticles (AuNPs) with hydrazone-linked ALA and MMP-2-activatable cell-penetrating peptides (CPPs)...
April 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28397137/fluorescence-guided-resection-of-extracranial-soft-tissue-tumour-infiltration-in-atypical-meningioma
#8
Florian Scheichel, Karl Ungersboeck, Melitta Kitzwoegerer, Franz Marhold
The exact role of 5-aminolevulinic acid (5-ALA) fluorescence-guided meningioma resection is as yet unclear. Although most of the meningiomas show positive fluorescence, the influence on outcome, fluorescence heterogeneity within the tumour, the correlation between fluorescence and the proliferation rate, as well as different quantitative measurements are a matter of debate. Positive fluorescence in bone infiltrative meningiomas is well described, whereas little data exist about 5-ALA fluorescence within soft tissue infiltration...
April 10, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28382525/5-aminolevulinic-acid-production-from-inexpensive-glucose-by-engineering-the-c4-pathway-in-escherichia-coli
#9
Wenwen Ding, Huanjiao Weng, Guocheng Du, Jian Chen, Zhen Kang
5-Aminolevulinic acid (ALA), the first committed intermediate for natural biosynthesis of tetrapyrrole compounds, has recently drawn intensive attention due to its broad potential applications. In this study, we describe the construction of recombinant Escherichia coli strains for ALA production from glucose via the C4 pathway. The hemA gene from Rhodobacter capsulatus was optimally overexpressed using a ribosome binding site engineering strategy, which enhanced ALA production substantially from 20 to 689 mg/L...
April 5, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28380684/effectiveness-of-photodynamic-therapy-in-elimination-of-hpv-16-and-hpv-18-associated-with-cin-i-in-mexican-women
#10
Elizabeth Maldonado Alvarado, M Olivia Osorio Peralta, Alejandra Moreno Vázquez, L Alejandra Martínez Guzmán, M Eugenia Melo Petrone, Z Iveth Enriquez Mar, D Estela Jovel Galdamez, Bárbara Carrión Solana, Guadalupe Balderas Martínez, Eduarda Parra, R Inés Castellanos Oliveros, R Linda Bello Leiva, Araceli Espinosa Montesinos, Citlalli Barrera Mendoza, S Eugenia Medina García, Eva Ramón Gallegos
The present study aimed to determine the effectiveness of photodynamic therapy (PDT), using δ-aminolevulinic acid (5-ALA), in the elimination of premalignant cervical lesions in Mexican patients with human papillomavirus (HPV) infection and/or cervical intraepithelial neoplasia (CIN). Thirty women diagnosed with CIN I and/or positive for HPV participated in the study. Topical 6% 5-ALA in gel form was applied to the uterine cervix; after 4 h, the lesion area was irradiated with a light dose of 200 J/cm(2) at 635 nm...
April 5, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28379547/randomized-prospective-double-blinded-study-comparing-3-different-doses-of-5-aminolevulinic-acid-for-fluorescence-guided-resections-of-malignant-gliomas
#11
Walter Stummer, Herbert Stepp, Otmar D Wiestler, Uwe Pichlmeier
BACKGROUND: Five-aminolevulinic acid (5-ALA) is used for fluorescence-guided resections of malignant glioma at a dose of 20 mg/kg; yet, it is unknown whether lower doses may also provide efficacy. OBJECTIVE: To perform a double-blinded randomized study comparing 3 different doses of 5-ALA. METHODS: Twenty-one patients with suspected malignant glioma were randomly assigned to 0.2, 2, or 20 mg/kg 5-ALA. Investigators were unaware of dose. Intraoperatively, regions of interest were first defined in tumor core, margin, and adjacent white matter under white light...
April 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28370019/efficacy-of-ultra-short-sub-30-minute-incubation-of-5-aminolevulinic-acid-photodynamic-therapy-in-vitro
#12
Eugene Koo, Evan Austin, Andrew Mamalis, Jared Jagdeo
BACKGROUND AND OBJECTIVE: The estimated incidence of cutaneous squamous cell carcinoma (SCC) is 700,000 cases per year. In the US, SCC incidence is highest among fair skinned adults older than 50 years of age. Thus, as the population ages, the reported number of SCCs will likely increase in the future. Photodynamic therapy (PDT) is an FDA approved therapy for treatment of actinic keratoses (AKs), a precursor to cutaneous SCC lesions. The FDA approved incubation time of the photosensitizing agent 5-aminolevulinic acid (ALA) is 14-18 hours...
March 29, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28367792/safety-and-efficacy-of-current-alternatives-in-the-topical-treatment-of-cutaneous-leishmaniasis-a-systematic-review
#13
Priscila Wolf Nassif, Tatiane França Perles DE Mello, Taísa Rocha Navasconi, Camila Alves Mota, Izabel Galhardo Demarchi, Sandra Mara Alessi Aristides, Maria Valdrinez Campana Lonardoni, Jorge Juarez Vieira Teixeira, Thaís Gomes Verzignassi Silveira
Studies of topical treatments for leishmaniasis were systematically reviewed, to evaluate the therapeutic efficacy, safety and any adverse effects of these treatments. The papers identified in the databases PubMed and Web of Knowledge involved eight studies with a total of 1744 patients. The majority of trials was from Iran (4/8), covered a period of 8 years (2003-2011), and included patients 4-85 years of age. The most frequent Leishmania species in the studies were L. tropica (4/8) and L. major (2/8). The treatments administered were thermotherapy, paromomycin and combinations, CO2 laser, 5-aminolevulinic acid hydrochloride (10%) plus visible red light (633 nm) and cryotherapy...
April 3, 2017: Parasitology
https://www.readbyqxmd.com/read/28363026/hydroxypyridinone-and-5-aminolaevulinic-acid-conjugates-for-photodynamic-therapy
#14
Sinan Battah, Robert C Hider, Alexander J MacRobert, Paul S Dobbin, Tao Zhou
Photodynamic therapy (PDT) is a promising treatment strategy for malignant and nonmalignant lesions. 5-Aminolaevulinic acid (ALA) is used as a precursor of the photosensitizer, protoporphyrin IX (PpIX), in dermatology and urology. However, the effectiveness of ALA-PDT is limited by the relatively poor bioavailability of ALA and rapid conversion of PpIX to haem. The main goal of this study was to prepare and investigate a library of single conjugates designed to coadminister the bioactive agents ALA and hydroxypyridinone (HPO) iron chelators...
April 6, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28358851/5-aminolevulinic-acid-mediated-photodynamic-therapy-and-its-strain-dependent-combined-effect-with-antibiotics-on-staphylococcus-aureus-biofilm
#15
Qing-Zhao Zhang, Ke-Qing Zhao, Yang Wu, Xian-Hui Li, Chen Yang, Li-Min Guo, Chun-Hong Liu, Di Qu, Chun-Quan Zheng
Staphylococcus aureus (S. aureus) is hard to be eradicated, not only due to the emergence of antibiotic resistant strains but also because of its ability to form biofilm. Antibiotics are the major approach to treating biofilm infections, but their effects are unsatisfactory. One of the potential alternative treatments for controlling biofilm infections is photodynamic therapy (PDT), which requires the administration of photosensitizer, followed by light activation. 5-aminolevulinic acid (ALA), a natural photosensitizer prodrug, presents favorable characteristics, such as easy penetration and rapid clearance...
2017: PloS One
https://www.readbyqxmd.com/read/28347842/potential-role-of-heme-metabolism-in-the-inducible-expression-of-heme-oxygenase-1
#16
Aka-Aki Takeda, Machiko Sasai, Yuka Adachi, Keiko Ohnishi, Jun-Ichi Fujisawa, Shingo Izawa, Shigeru Taketani
BACKGROUND: The degradation of heme significantly contributes to cytoprotective effects against oxidative stress and inflammation. The enzyme heme oxygenase-1 (HO-1), involved in the degradation of heme, forms carbon monoxide (CO), ferrous iron, and bilirubin in conjunction with biliverdin reductase, and is induced by various stimuli including oxidative stress and heavy metals. We examined the involvement of heme metabolism in the induction of HO-1 by the inducers sulforaphane and sodium arsenite...
March 24, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28346389/artesunate-enhances-the-cytotoxicity-of-5-aminolevulinic-acid-based-sonodynamic-therapy-against-mouse-mammary-tumor-cells-in-vitro
#17
Tomohiro Osaki, Yoshihiro Uto, Masahiro Ishizuka, Tohru Tanaka, Nobuyasu Yamanaka, Tsukasa Kurahashi, Kazuo Azuma, Yusuke Murahata, Takeshi Tsuka, Norihiko Itoh, Tomohiro Imagawa, Yoshiharu Okamoto
Sonodynamic therapy (SDT) kills tumor cells through the synergistic effects of ultrasound (US) and a sonosensitizer agent. 5-Aminolevulinic acid (5-ALA) has been used as a sonodynamic sensitizer for cancer treatment. However, studies have shown that 5-ALA-based SDT has limited efficacy against malignant tumors. In this study, we examined whether artesunate (ART) could enhance the cytotoxicity of 5-ALA-based SDT against mouse mammary tumor (EMT-6) cells in vitro. In the ART, ART + US, ART + 5-ALA, and ART + 5-ALA + US groups, the cell survival rate correlated with ART concentration, and decreased with increasing concentrations of ART...
March 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28338432/dual-labeling-with-5-aminolevulinic-acid-and-fluorescein-for-fluorescence-guided-resection-of-high-grade-gliomas-technical-note
#18
Eric Suero Molina, Johannes Wölfer, Christian Ewelt, André Ehrhardt, Benjamin Brokinkel, Walter Stummer
OBJECTIVE Fluorescence guidance with 5-aminolevulinic acid (5-ALA) helps improve resections of malignant gliomas. However, one limitation is the low intensity of blue light for background illumination. Fluorescein has recently been reintroduced into neurosurgery, and novel microscope systems are available for visualizing this fluorochrome, which highlights all perfused tissues but has limited selectivity for tumor detection. Here, the authors investigate a combination of both fluorochromes: 5-ALA for distinguishing tumor and fluorescein for providing tissue fluorescence of adjacent brain tissue...
March 24, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28338177/5-aminolevulinic-acid-photodynamic-therapy-stimulates-local-immunity-in-patients-with-condylomata-acuminata-via-activation-of-t-lymphocytes
#19
J Du, Q Cheng, Z Zhang, J-F Wu, F Li, S-Y Chen, Y-L Wang, X-N Lu, J-H Xu
OBJECTIVE: 5-Aminolevulinic acid photodynamic therapy (5-ALA-PDT) for condylomata acuminate (CA) is effective and safe, but how this treatment affects immune reaction is poorly understood. We aimed to explore the effects of PDT on local immunity in CA. PATIENTS AND METHODS: Immunohistochemical analysis before and after PDT was performed to analyze local changes in the distribution of T lymphocytes, CD123+ plasmacytoid dendritic cells (pDCs) and CD1a+ myeloid DCs...
March 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28336806/fluorouracil-enhances-photodynamic-therapy-of-squamous-cell-carcinoma-via-a-p53-independent-mechanism-that-increases-protoporphyrin-ix-levels-and-tumor-cell-death
#20
Sanjay Anand, Kishore R Rollakanti, Niokelta Brankov, Douglas E Brash, Tayyaba Hasan, Edward V Maytin
Photodynamic therapy (PDT), using 5-aminolevulinic acid (ALA) to drive synthesis of protoporphryin IX (PpIX) is a promising, scar-free alternative to surgery for skin cancers, including squamous cell carcinoma (SCC) and SCC precursors called actinic keratoses (AK). In the United States, PDT is only FDA approved for treatment of AK; this narrow range of indications could be broadened if PDT efficacy were improved. Toward that goal, we developed a mechanism-based combination approach using 5-fluorouracil (5-FU) as a neoadjuvant for ALA-based PDT...
March 23, 2017: Molecular Cancer Therapeutics
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