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Rezk MNN, Ahmed SM, Gaber SS, Mohammed MM, Yousri NA, Welson NN. Curcumin protects against lamotrigine-induced chronic ovarian and uterine toxicity in rats by regulating PPAR-γ and ROS production. J Biochem Mol Toxicol 2024; 38:e23599. [PMID: 38050455 DOI: 10.1002/jbt.23599] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 08/11/2023] [Accepted: 11/20/2023] [Indexed: 12/06/2023]
Abstract
Lamotrigine (LTG) is an antiepileptic drug with possible adverse effects on the female reproductive system. Curcumin was declared to improve ovarian performance. Therefore, this study aimed to clarify ovulatory dysfunction (OD) associated with LTG and the role of curcumin in ameliorating this dysfunction. Adult female Wister albino rats were assigned into four groups: negative control (received saline), positive control (received curcumin only), LTG, and LTG with curcumin groups. Drugs were administered for 90 days. The hormonal profile, including testosterone, estrogen, progesterone, luteinizing hormone, and follicle-stimulating hormone, in addition to the lipid profile and glycemic analysis, were tested. Oxidative stress biomarkers analysis in the ovaries and uterus and peroxisome proliferator-activated receptor-γ (PPAR-γ) gene expression were also included. Histopathological examination of ovarian and uterine tissues and immunohistochemical studies were also performed. Curcumin could improve the OD related to chronic LTG intake. That was proved by the normalization of the hormonal profile, glycemic control, lipidemic status, oxidative stress markers, and PPAR-γ gene expression. The histopathological and immunohistochemical examination of ovarian and uterine tissues revealed an improvement after curcumin administration. The results describe an obvious deterioration in ovarian performance with LTG through the effect on lipidemic status, PPAR-γ gene, and creating an oxidative stress condition in the ovaries of chronic users, with a prominent improvement with curcumin addition to the treatment protocol.
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Affiliation(s)
- Meriam N N Rezk
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Minia University, Minia, Egypt
| | - Sabreen Mahmoud Ahmed
- Department of Human Anatomy and Embryology, Faculty of Medicine, Minia University, Delegated to Deraya University, New Minia City, Egypt
| | - Shereen S Gaber
- Department of Biochemistry, Faculty of Medicine, Minia University, Minia, Egypt
| | - Mostafa M Mohammed
- Department of Biochemistry, Faculty of Medicine, Minia University, Minia, Egypt
| | - Nada A Yousri
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Minia University, Minia, Egypt
| | - Nermeen N Welson
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt
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Shady NH, Hassan HA, Elrehany MA, Kamel MS, Ali Saber E, Maher SA, Abo-Elsoud FA, Sayed AM, Abdelmohsen UR, Gaber SS. Hyphaene thebaica (doum)-derived extract alleviates hyperglycemia in diabetic rats: a comprehensive in silico, in vitro and in vivo study. Food Funct 2021; 12:11303-11318. [PMID: 34643201 DOI: 10.1039/d1fo02025k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In the present study, we investigated the hypoglycemic effect of different extracts (i.e. organic and aqueous) derived from the fruits of Hyphaene thebaica (doum) on male streptozotocin-induced diabetic rats. Blood glucose levels as well as the relative gene expression of insulin, TNF-α, and TGF-β were determined in the pancreatic tissue of the experimental animals. Treatment of STZ-induced diabetic rats with aqueous extracts of the plant fruit over 7 weeks significantly reduced the elevated blood glucose and increased the relative expression of insulin, while the relative expression of inflammatory mediators (i.e. TNF-α and TGF-β) was significantly reduced. Histopathological investigation also revealed that the aqueous extract treatment effectively reversed the β-cell necrosis induced by STZ and restored its normal morphology. Furthermore, liquid chromatography high resolution mass spectrometry (LC-HRMS) and in silico chemical investigation of the aqueous extract elucidated its major bioactive phytochemicals (i.e. flavonoids) and putatively determined the pancreatic KATP channel as a target for these bioactive components. In vitro insulin secretion assay revealed that myricetin, luteolin, and apigenin were able to induce insulin secretion by human pancreatic cells (insulin production = 20.9 ± 1.3, 13.74 ± 1.8, and 11.33 ± 1.1 ng mL-1, respectively). Using molecular docking and dynamics simulations, we were able to shed the light on the insulin secretagogue's mode of action through these identified bioactive compounds and to determine the main structural elements required for its bioactivity. This comprehensive investigation of this native fruit will encourage future clinical studies to recommend edible and widely available fruits like doum to be a part of DM treatment plans.
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Affiliation(s)
- Nourhan Hisham Shady
- Department of Pharmacognosy, Faculty of Pharmacy, Deraya University, Universities Zone, New Minia City 61111, Egypt.
| | - Heba Ali Hassan
- Department of Pharmacognosy, Faculty of Pharmacy, Sohag University, 82524 Sohag, Egypt
| | - Mahmoud A Elrehany
- Department of Biochemistry, Faculty of Pharmacy, Deraya University, Universities Zone, New Minia City 61111, Egypt.,Department of Biochemistry, Faculty of Medicine, Minia University, Minia 61519, Egypt
| | - Mohamed Salah Kamel
- Department of Pharmacognosy, Faculty of Pharmacy, Deraya University, Universities Zone, New Minia City 61111, Egypt. .,Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia 61519, Egypt
| | - Entesar Ali Saber
- Department of Histology and Cell Biology, Faculty of Medicine, Minia University, Minia, 61519, Egypt.,Delegated to Deraya University, Universities Zon, New Minia City 61111, Egypt
| | - Sherif A Maher
- Department of Biochemistry, Faculty of Pharmacy, Deraya University, Universities Zone, New Minia City 61111, Egypt
| | - Fatma A Abo-Elsoud
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Deraya University, Universities Zone, New Minia City 61111, Egypt
| | - Ahmed M Sayed
- Department of Pharmacognosy, Faculty of Pharmacy, Nahda University, 62513 Beni-Suef, Egypt
| | - Usama Ramadan Abdelmohsen
- Department of Pharmacognosy, Faculty of Pharmacy, Deraya University, Universities Zone, New Minia City 61111, Egypt. .,Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia 61519, Egypt
| | - Shereen S Gaber
- Department of Biochemistry, Faculty of Medicine, Minia University, Minia 61519, Egypt
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Mohammed MM, Shaker O, Ramzy MM, Gaber SS, Kamel HS, Abed El Baky MF. The relation between ACKR4 and CCR7 genes expression and breast cancer metastasis. Life Sci 2021; 279:119691. [PMID: 34102193 DOI: 10.1016/j.lfs.2021.119691] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/21/2021] [Accepted: 05/30/2021] [Indexed: 11/18/2022]
Abstract
AIMS Breast cancer is the most severe malignant tumor in women. Chemokines and their receptors appear to be implicated in tumorigenesis and metastatic pattern. Also the scavenger atypical chemokine receptors are emerging as crucial regulators for the availability of chemokines. Therefore the aim of the present study is to evaluate the expression of CCR7, ACKR4 and their ligand; CCL21 in human breast cancer. MAIN METHODS In this study, RT-PCR was done to detect the expression of CCR7 and ACKR4 in 50 non-metastatic and 30 metastatic breast cancer tissue. Also CCL21 level in the serum of study group was detected by ELISA. The expression of all markers is compared to 80 control healthy individual. KEY FINDINGS Our results revealed the increase in expression of CCR7 and CCL21 level in metastatic group compared to non-metastatic and control groups while ACKR4 expression is significantly increased in breast tissues of non-metastatic patients compared to both control and metastatic groups. Also there was significant positive correlation between CCR7 expression and CCL21 level in cancer patients and significant negative correlation between ACKR4 and both CCR-7 and CCL21 in both non-metastatic and metastatic cancer groups. SIGNIFICANCE Thus, it might be elucidating that ACKR4 and CCR7 could be a novel target for tumor therapy as targeting the chemokine-receptors axis might represent a powerful tool to prevent infiltration and metastasis and consequently improve cancer prognosis and treatment.
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Affiliation(s)
- Mostafa M Mohammed
- Department of Biochemistry, Faculty of Medicine, Minia University, Egypt
| | - Olfat Shaker
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Cairo University, Egypt
| | - Maggie M Ramzy
- Department of Biochemistry, Faculty of Medicine, Minia University, Egypt.
| | - Shereen S Gaber
- Department of Biochemistry, Faculty of Medicine, Minia University, Egypt
| | - Heba S Kamel
- Department of Biochemistry, Faculty of Medicine, Minia University, Egypt
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Alaaeldin E, Abou-Taleb HA, Mohamad SA, Elrehany M, Gaber SS, Mansour HF. Topical Nano-Vesicular Spanlastics of Celecoxib: Enhanced Anti-Inflammatory Effect and Down-Regulation of TNF-α, NF-кB and COX-2 in Complete Freund's Adjuvant-Induced Arthritis Model in Rats. Int J Nanomedicine 2021; 16:133-145. [PMID: 33447032 PMCID: PMC7802787 DOI: 10.2147/ijn.s289828] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 12/18/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Rheumatoid arthritis (RA) is an autoimmune disease that underlies chronic inflammation of the synovial membrane. Non-steroidal anti-inflammatory drugs (NSAIDs) are commonly used to treat RA. However, a long list of adverse events associated with long-term treatment regimens with NSAIDs negatively influences patient compliance and therapeutic outcomes. AIM The aim of this work was to achieve site-specific delivery of celecoxib-loaded spanlastic nano-vesicle-based delivery system to the inflamed joints, avoiding systemic administration of large doses. METHODOLOGY To develop spanlastic nanovesicles for transdermal delivery of celecoxib, modified injection method was adopted using Tween 80 or Brij as edge activators. Entrapment efficiency, vesicle size, ex vivo permeation, and morphology of the prepared nano-vesicles were characterized. Carbopol-based gels containing the selected formulations were prepared, and their clarity, pH, rheological performance, and ex vivo permeation were characterized. Celecoxib-loaded niosomes and noisome-containing gels were developed for comparison. The in vivo efficacy of the selected formulations was evaluated in a rat model of Freund's complete adjuvant-induced arthritis. Different inflammatory markers including TNF-α, NF-кB and COX-2 were assessed in paw tissue before and after treatment. RESULTS The size and entrapment efficiency of the selected spanlastic nano-vesicle formulation were 112.5 ± 3.6 nm, and 83.6 ± 2.3%, respectively. This formulation has shown the highest transdermal flux and permeability coefficient compared to the other investigated formulations. The spanlastics-containing gel of celecoxib has shown transdermal flux of 6.9 ± 0.25 µg/cm2/hr while the celecoxib niosomes-containing gel and unprocessed celecoxib-loaded gel have shown 5.2 ± 0.12 µg/cm2/hr and 0.64 ± 0.09 µg/cm2/hr, respectively. In the animal model of RA, the celecoxib-loaded spanlastics-containing gel significantly reduced edema circumference and significantly suppressed TNF-α, NF-кB and COX-2 levels compared to the niosomes-containing gel, the marketed diclofenac sodium gel, and unprocessed celecoxib-loaded gel. CONCLUSION The spanlastic nano-vesicle-containing gel represents a more efficient site-specific treatment for topical treatment of chronic inflammation like RA, compared to commercial and other conventional alternatives.
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MESH Headings
- Administration, Cutaneous
- Administration, Topical
- Animals
- Anti-Inflammatory Agents, Non-Steroidal/administration & dosage
- Anti-Inflammatory Agents, Non-Steroidal/pharmacology
- Anti-Inflammatory Agents, Non-Steroidal/therapeutic use
- Arthritis, Rheumatoid/chemically induced
- Arthritis, Rheumatoid/drug therapy
- Arthritis, Rheumatoid/genetics
- Arthritis, Rheumatoid/metabolism
- Celecoxib/pharmacology
- Celecoxib/therapeutic use
- Cyclooxygenase 2/genetics
- Cyclooxygenase 2/metabolism
- Disease Models, Animal
- Down-Regulation/drug effects
- Drug Delivery Systems/methods
- Freund's Adjuvant
- Gene Expression Regulation/drug effects
- Kinetics
- Liposomes
- Male
- Mice
- NF-kappa B/genetics
- NF-kappa B/metabolism
- Nanoparticles/chemistry
- Particle Size
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats, Wistar
- Rheology
- Skin Absorption/drug effects
- Tumor Necrosis Factor-alpha/genetics
- Tumor Necrosis Factor-alpha/metabolism
- Rats
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Affiliation(s)
- Eman Alaaeldin
- Department of Pharmaceutics, Faculty of Pharmacy, Deraya University, Minia, Egypt
- Department of Pharmaceutics, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Heba A Abou-Taleb
- Department of Pharmaceutics and Industrial Pharmacy, Nahda University (NUB), Beni-Suef, Egypt
| | - Soad A Mohamad
- Department of Pharmaceutics, Faculty of Pharmacy, Deraya University, Minia, Egypt
| | - Mahmoud Elrehany
- Department of Biochemistry, Faculty of Pharmacy, Deraya University, Minia, Egypt
- Department of Biochemistry, Faculty of Medicine, Minia University, Minia, Egypt
| | - Shereen S Gaber
- Department of Biochemistry, Faculty of Medicine, Minia University, Minia, Egypt
| | - Heba F Mansour
- Department of Pharmaceutics, Faculty of Pharmacy, Minia University, Minia, Egypt
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Welson NN, Rofaeil RR, Ahmed SM, Gaber SS, Batiha GES, Shahataa MG. Vitamin E protects against gabapentin-induced chronic hepatic and renal damage associated with the inhibition of apoptosis and tissue injury in rats. Life Sci 2020; 267:118940. [PMID: 33359747 DOI: 10.1016/j.lfs.2020.118940] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 08/23/2020] [Revised: 12/11/2020] [Accepted: 12/13/2020] [Indexed: 12/19/2022]
Abstract
AIMS This study aimed to investigate the potential protective effects of vitamin E against gabapentin-induced chronic liver and kidney injury associated with the inhibition of biomarkers of apoptosis and tissue injury. MATERIALS AND METHODS Four groups of adult male rats were included; control, gabapentin (100 mg/kg/day), Vitamin E (80 mg/kg/day), and a combination of gabapentin and Vitamin E for 90 days. Serum levels of AST, ALT, LDH, ALP, urea, and creatinine were measured in addition to malondialdehyde (MDA), and reduced glutathione (GSH) tissue levels. P53 gene expression, histological, and immunohistochemical examinations were performed in liver and kidney tissue samples. KEY FINDINGS Gabapentin increased AST, ALT, LDH, ALP, urea, creatinine, MDA, and p53 gene expression and it reduced GSH. Moreover, gabapentin administration caused structural changes in the hepatic and renal architecture with a weak Periodic acid-Schiff (PAS) reaction that reflects glycogen deposition in the liver and kidney and a positive immunoreaction for BCL2-associated X protein (BAX) that reflects activated apoptosis. Vitamin E significantly (p<0.05) reversed the biochemical alterations associated with chronic gabapentin administration and improved the histopathological picture of hepatic and renal tissue with a partial inhibition of BAX. SIGNIFICANCE Chronic administration of gabapentin causes hepatic and renal impairments, which is ameliorated by Vitamin E; possibly due to the inhibition of biomarkers of apoptosis and tissue injury.
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Affiliation(s)
- Nermeen N Welson
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt.
| | - Remon R Rofaeil
- Department of Pharmacology, Faculty of Medicine, Minia University, Minia, Egypt; Department of Pharmacology, Faculty of Pharmacy, Deraya University, New Minia City, Egypt
| | - Sabreen Mahmoud Ahmed
- Department of Human Anatomy and Embryology, Faculty of Medicine, Minia University, delegated to Deraya University, New Minia City, Egypt
| | - Shereen S Gaber
- Department of Biochemistry, Faculty of Medicine, Minia University, delegated to Deraya University, New Minia City, Egypt
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Mary Girgis Shahataa
- Department of Pharmacology, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt
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Shokry DA, El Nabrawy N, Yassa HD, Gaber SS, Batiha GES, Welson NN. Pregabalin induced reproductive toxicity and body weight changes by affecting caspase3 and leptin expression: Protective role of wheat germ oil. Life Sci 2020; 260:118344. [PMID: 32853651 DOI: 10.1016/j.lfs.2020.118344] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 05/12/2020] [Revised: 08/06/2020] [Accepted: 08/22/2020] [Indexed: 01/23/2023]
Abstract
Pregabalin (PGB) drug abuse is common among the youth. It substituted tramadol before its recent schedule as a controlled drug since April 2019. PGB is an antiepileptic drug acting on the central nervous system. It blocks calcium channels regulating the action of neurotransmitters and causing prolonged depolarization. The present study aimed to investigate the toxic effect of long term pregabalin abuse on the reproductive function and body weight in both male and female albino rats and to evaluate the ameliorative effect of wheat germ oil (WGO). Forty-eight rats were randomly divided into eight groups. The first four groups were males and they were treated as follows: control group (1.5 mL saline), WGO group (1.5 mL L/kg), PGB group (300 mg/kg), and protective group (PGB + WGO). All doses were administrated once per day for 60 days by gastric gavage. The second four groups were females. They were divided and treated the same as the male groups. Pregabalin caused significant weight loss, decreased serum triglyceride level, and increased leptin gene expression in all rats. PGB affected male rats reproduction by decreasing total testosterone serum level and inhibiting spermatogenesis. Reproductive toxicity in females was caused by decreasing pituitary steroids, increasing gonadal hormones, and increasing the number of atretic ovarian follicles. Mechanism of toxicity may be attributed to the PGB oxidative stress effect that induced apoptosis and caused diffuse gonadal atrophy. WGO showed a protective effect on PGB induced toxicity as all measured parameters were relatively improved.
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Affiliation(s)
- Dina A Shokry
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Cairo University, Egypt
| | - Naglaa El Nabrawy
- National Research Center, Faculty of Medicine, Cairo University, Egypt
| | - Hanan D Yassa
- Anatomy and Embryology Department, Faculty of Medicine, Beni-Suef University, Egypt
| | - Shereen S Gaber
- Biochemistry Department, Faculty of Medicine, Minia University, Egypt
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Egypt
| | - Nermeen N Welson
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Beni-Suef University, Egypt.
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Bebars GM, Sallam SA, Gaber SS, Abdelaziz AH. Assessment of Preptin peptide level in the sera of rachitic children and in breast milk of their mothers. Ital J Pediatr 2019; 45:34. [PMID: 30845974 PMCID: PMC6407189 DOI: 10.1186/s13052-019-0628-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 02/27/2019] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Preptin is a 34-residue pancreatic hormone that stimulates osteoblast proliferation and reduces osteoblast apoptosis. RESEARCH AIMS To measure levels of serum Preptin in rachitic children and in breastmilk of their mothers and to compare with levels in healthy non-rachitic children. METHODS Thirty children with rickets and another 30 non-rachitic age and sex matched controls were subjected to detailed history, physical examination including anthropometric measurements, assessment of signs of rickets and laboratory measurement of serum vitamin D, calcium, phosphorus, alkaline phosphatase and Preptin. Mothers' breast milk Preptin were also measured. RESULTS Significantly lower serum Preptin (p < 0.001) in rachitic children with a significant negative correlation between serum Preptin and alkaline phosphatase (P < 0.0001). Lower breastmilk Preptin levels in mothers of rachitic children (P < 0.001) with a negative correlation between breastmilk Preptin and both maternal weight and BMI(P < 0.01&P < 0.02). Mothers' milk Preptin is positively correlated with serum Preptin and calcium in non-rachitic children(P < 0.001&0.04), but negatively correlated with their mothers' age (P < 0.01). CONCLUSION Preptin may play a role in the etiology of rickets in children. Further studies are recommended to evaluate Preptin role in treatment of rickets in children.
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Affiliation(s)
- Gihan M. Bebars
- Faculty of Medicine, Pediatric Department, Minia University, Minia, Egypt
| | - Salem A. Sallam
- Faculty of Medicine, Pediatric Department, Minia University, Minia, Egypt
| | - Shereen S. Gaber
- Faculty of Medicine, Biochemistry Department, Minia University, Minia, Egypt
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Rofaeil RR, Gaber SS. Gastroprotective effect of memantine in indomethacin-induced peptic ulcer in rats, a possible role for potassium channels. Life Sci 2019; 217:164-168. [DOI: 10.1016/j.lfs.2018.12.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 11/24/2018] [Accepted: 12/03/2018] [Indexed: 01/19/2023]
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Caporale LH, Gaber SS, Kell W, Götze O. A fluorescent assay for complement activation. The Journal of Immunology 1981. [DOI: 10.4049/jimmunol.126.5.1963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
We report here a rapid assay for the complement enzymes CVFBb, C4b2a and Cls. This assay involves the use of a peptide substrate that releases a fluorescent coumarin derivative (AMC) upon cleavage by the convertase. The substrate, BocLeuGlyArgAMC, was chosen because its sequence is similar to the carboxyl terminus of C3a, and identical to that of C5a. The Km of this substrate are about 125 microM for the C3/5 convertase CVFBb, 169 microM for C4b2a, and 140 microM for C1s.
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Caporale LH, Gaber SS, Kell W, Götze O. A fluorescent assay for complement activation. J Immunol 1981; 126:1963-5. [PMID: 7217674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We report here a rapid assay for the complement enzymes CVFBb, C4b2a and Cls. This assay involves the use of a peptide substrate that releases a fluorescent coumarin derivative (AMC) upon cleavage by the convertase. The substrate, BocLeuGlyArgAMC, was chosen because its sequence is similar to the carboxyl terminus of C3a, and identical to that of C5a. The Km of this substrate are about 125 microM for the C3/5 convertase CVFBb, 169 microM for C4b2a, and 140 microM for C1s.
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