1. This study investigates the acetylation of 5-aminosalicylic acid by isolated human colonic epithelial cells. 2. After incubation of intact cells with 0.1 mmol/l 5-aminosalicylic acid, N-acetyl-5-aminosalicylic acid was detected in a concentration of 141 (+/- 23.8 SEM) nmol/g dry weight in the incubation medium, and 34.8 (+/- 5.5 SEM) nmol/g dry weight intracellularly. No unchanged 5-aminosalicylic acid was detected inside the cell. 3. Acetylation of 5-aminosalicylic acid by a cell homogenate was very poor, but the addition of 1 mmol/l acetyl-CoA resulted in complete conversion of 0.1 mmol/l 5-aminosalicylic acid to N-acetyl-5-aminosalicylic acid. 4. N-Acetyltransferase activity was detected in the cytosol, with a mean of 3.3 nmol min-1 mg-1 of protein. There was no N-acetyltransferase activity in the brush border. There was no difference in enzyme activity between epithelial cells derived from normal, Crohn's disease or ulcerative colitis patients. 5. Preliminary characterization of the N-acetyltransferase enzyme suggests a molecular weight of 150,000.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1042/cs0780105 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Successful Treatment of Refractory Ulcerative Colitis With 5-Aminosalicylic Acid Intolerance and Biologic Therapy Resistance Using Combined Granulocyte and Monocyte Adsorptive Apheresis.
Cureus
January 2025
Department of Gastroenterology, Tsuchiya General Hospital, Hiroshima, JPN.
We report the case of a 37-year-old male patient diagnosed with moderate left-sided ulcerative colitis (UC). Initial therapy with 5-aminosalicylic acid (5-ASA) was terminated within days due to exacerbation of symptoms, leading to a diagnosis of 5-ASA intolerance. Although induction of remission was achieved with prednisolone, the patient developed steroid dependency.
View Article and Find Full Text PDFClinical features, treatment, and prognosis of secukinumab-induced inflammatory bowel disease.
Eur J Med Res
January 2025
Department of Clinical Pharmacy, Xiangtan Central Hospital (The affiliated hospital of Hunan university), 120 Heping Road, Yuhu District, Xiangtan, 411100, Hunan, China.
Background: Inflammatory bowel disease (IBD) is a rare adverse effect linked to secukinumab, with limited clinical data available. This study aimed to analyze the clinical features of secukinumab-induced IBD and to offer recommendations for the careful administration of secukinumab.
Methods: We conducted a retrospective analysis by gathering case reports and case series of secukinumab-induced IBD through a database search, with data collected until September 30, 2024.
Medical, Endoscopic, and Surgical Treatments for Rectal Cuffitis in IBD Patients with an Ileal Pouch-Anal Anastomosis: A Narrative Review.
Dig Dis Sci
January 2025
Department of Gastroenterology, Hepatology, and Nutrition, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH, 44195, USA.
Background: Ulcerative colitis patients who undergo ileal pouch-anal anastomosis (IPAA) without mucosectomy may develop inflammation of the rectal cuff (cuffitis). Treatment of cuffitis typically includes mesalamine suppositories or corticosteroids, but refractory cuffitis may necessitate advanced therapies or procedural interventions. This review aims to summarize the existing literature regarding treatments options for cuffitis.
View Article and Find Full Text PDFDesigning & optimisation of dual Ca and SO ionic cross-linked sericin/pectin microbeads using response surface methodology for colon-specific delivery.
J Biomater Sci Polym Ed
January 2025
School of Studies in Pharmaceutical Sciences, Jiwaji University, Gwalior, India.
Ulcerative colitis, a chronic inflammatory condition of the colon, requires precise and targeted treatment, and polysaccharides, with their pH responsiveness and biodegradability, offer an innovative approach for colon-specific drug delivery. This study aims to develop a highly precise drug delivery system with enhanced therapeutic and targeting efficiency for ulcerative colitis, focusing on the preparation, optimisation, and evaluation of dual cross-linked mesalamine-loaded sericin-pectin (DSPs) micro-beads. These beads utilise the pH-responsive and microflora biodegradability properties of polysaccharides for targeted colon delivery, employing the Response Surface Methodology.
View Article and Find Full Text PDFPseudohaematuria Due to Mesalazine: A Case Report.
Nephrology (Carlton)
January 2025
School of Pharmacy, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia.
The symptom of macroscopic or 'visible' haematuria can cause significant patient distress, largely due to its' potential association with urinary tract malignancy, infection or glomerular disease. This lesson from practice describes the case of a 19-year-old female patient for whom the cause of red/brown urinary discolouration was found to relate to a reaction between renally excreted mesalazine and domestic bleach in the toilet bowel. Recognition of this phenomenon in patients taking mesalazine for inflammatory colitis is important to minimise patient distress and unnecessary investigation for a urinary tract cause.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!