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Abakarim O, Maghnouj O, Hamdaoui A, Lahlimi F, Tazi I. Relapse of Hodgkin's disease revealed by skin involvement. Clin Case Rep 2022; 10:e6244. [PMID: 36093457 PMCID: PMC9440343 DOI: 10.1002/ccr3.6244] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 07/02/2022] [Accepted: 07/23/2022] [Indexed: 11/12/2022] Open
Abstract
We present a case of a relapse of HL revealed by a skin involvement. A biopsy of the skin lesion showed infiltration by a mixed cellularity and Reed–Sternberg cells. The immunoreactivity was positive for CD30 and CD15. The patient was undergoing ICE protocol with good improvement after three cycles.
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Affiliation(s)
- Ouadii Abakarim
- Department of Clinical Hematology & Bone Marrow Transplantation, University Hospital Centre Mohammed VI, Faculty of Medicine and Pharmacy Cadi Ayyad University Marrakesh Morocco
| | - Oumaima Maghnouj
- Department of Clinical Hematology & Bone Marrow Transplantation, University Hospital Centre Mohammed VI, Faculty of Medicine and Pharmacy Cadi Ayyad University Marrakesh Morocco
| | | | - Fatima Zahra Lahlimi
- Department of Clinical Hematology & Bone Marrow Transplantation, University Hospital Centre Mohammed VI, Faculty of Medicine and Pharmacy Cadi Ayyad University Marrakesh Morocco
| | - Illias Tazi
- Department of Clinical Hematology & Bone Marrow Transplantation, University Hospital Centre Mohammed VI, Faculty of Medicine and Pharmacy Cadi Ayyad University Marrakesh Morocco
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Samlani Z, Lemfadli Y, Errami AA, Oubaha S, Hamdaoui A, Krati K. Tumeurs neuroendocrines à cellules claires du pancréas : A propos de deux cas et revue de la littérature. PAMJ-CM 2021. [DOI: 10.11604/pamj-cm.2021.6.40.30402] [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: 11/11/2022] Open
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3
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Hocar O, Aboudourib M, Akhdari N, Hamdaoui A, Mouttaki T, Soussi M, Chiheb S, Amal S, Riyad M. Leishmaniose sublinguale pseudotumorale à Leishmania infantum. Ann Dermatol Venereol 2020; 147:383-386. [DOI: 10.1016/j.annder.2020.01.011] [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] [Received: 06/01/2019] [Revised: 12/18/2019] [Accepted: 01/23/2020] [Indexed: 10/24/2022]
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4
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Benyza N, Messai A, Hamdaoui A, Lanez T, Sayin K. Synthesis, quantum chemical computations and x-ray crystallographic studies of a new complex based of manganese (+II). J Fundam and Appl Sci 2017. [DOI: 10.4314/jfas.v9i2.11] [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: 11/17/2022] Open
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5
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Hamdaoui A, Messai A, Benyza N, Lanez T, Sayin K. Synthesis, crystal structures, hydrogen bonding graph-sets and theoretical studies of nickel (+II) co-ordinations with pyridine-2,6-dicarboxamide oxime. J Fundam and Appl Sci 2017. [DOI: 10.4314/jfas.v9i1.13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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6
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Atarguine H, Hocar O, Oussmane S, Mouafik SB, Hamdaoui A, Hafiane H, Belbaraka R, Akhdari N, Amal S. Multisystem Langerhans Cell Histiocytosis in Adults Revealed by Skin Lesions. Skinmed 2016; 14:147-149. [PMID: 27319965] [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: 06/06/2023]
Abstract
A 37-year-old woman with no remarkable medical or family history presented with papules and vesicles on an erythematous background involving the neck, sacrum, and folds (postauricular, axillary, inguinal, and under the breasts) (Figure 1). During the previous year, she was treated with local and systemic antifungals without improvement. Her history included a secondary amenorrhea, polydipsia, and polyuria (6 L/d) that started 2 years prior. Physical examination revealed chronic bilateral purulent otorrhea with thick eardrums. Histologic examination of skin biopsy revealed a highly suggestive appearance of multisystem Langerhans cell histiocytosis (LCH) with immunohistochemistry (anti-PS100 and anti-CD1a), which were positive (Figure 2A and 2B). Pituitary magnetic resonance imaging showed a thickening of the pituitary stalk in relation to a location histiocytic (Figure 3). Bone gaps were objectified on two radiographic tibial diaphyseal. Results from computed tomography (CT) scan showed a magma coelio mesenteric, axillary, and inguinal lymph nodes.
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Affiliation(s)
- Hanane Atarguine
- Department of Dermatology, Hospital Arrazi, CHU Mohamed VI, Marrakech, Morocco
- Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco;
| | - Ouafa Hocar
- Department of Dermatology, Hospital Arrazi, CHU Mohamed VI, Marrakech, Morocco
- Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco
| | - Samia Oussmane
- Department of Dermatology, Hospital Arrazi, CHU Mohamed VI, Marrakech, Morocco
- Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco
| | - Sara Batoul Mouafik
- Department of Dermatology, Hospital Arrazi, CHU Mohamed VI, Marrakech, Morocco
- Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco
| | | | - Hanan Hafiane
- Department of Hematology, CHU Mohamed VI, Marrakech, Morocco
| | - Rhizlane Belbaraka
- Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco
- Department of Medical Oncology, CHU Mohamed VI, Marrakech, Morocco
| | - Nadia Akhdari
- Department of Dermatology, Hospital Arrazi, CHU Mohamed VI, Marrakech, Morocco
- Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco
| | - Said Amal
- Department of Dermatology, Hospital Arrazi, CHU Mohamed VI, Marrakech, Morocco
- Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco
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Chabli H, Hocar O, Akhdari N, Amal S, Hakkou M, Hamdaoui A. [Necrotic leg ulcer revealing vasculitis induced by vitamin K antagonists]. ACTA ACUST UNITED AC 2015; 40:402-5. [PMID: 26548536 DOI: 10.1016/j.jmv.2015.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 01/12/2015] [Accepted: 04/20/2015] [Indexed: 11/28/2022]
Abstract
UNLABELLED Vitamin K antagonists are widely used in thromboembolic diseases. Hemorrhagic complications related to drug overdose represent their main side effect. We report a rare side effect, a severe and unexpected type of skin vasculitis - necrotic leg ulcer - induced by vitamin K antagonist. CASE REPORT A 63-year-old female with a history of diabetes developed hyperalgesic necrotic ulcerations on the lower limbs one month after starting an acenocoumarol-based treatment for ischemic heart disease. Histological examination revealed lymphocytic vasculitis with fibrinoid necrosis. Etiological explorations searching for vasculitis were negative. In the absence of a precise etiology, drug-induced ulcer was suspected. Low molecular weight heparin was prescribed to replace acenocoumarol. The lesions slowly resolved with topical treatment. DISCUSSION The chronological criteria and the negativity of etiological explorations allowed the diagnosis of vitamin K antagonist-induced necrotic skin ulcer. Clinicians should be aware of this rare complication induced by oral anticoagulants because of its practical therapeutic implications. This is the first case of necrotic leg ulcer induced by acenocoumarol corresponding histologically to necrotising lymphocytic vasculitis.
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Affiliation(s)
- H Chabli
- Service de dermatologie et de vénéréologie, hôpital Arrazi, CHU Mohammed VI, Marrakech, Maroc.
| | - O Hocar
- Service de dermatologie et de vénéréologie, hôpital Arrazi, CHU Mohammed VI, Marrakech, Maroc
| | - N Akhdari
- Service de dermatologie et de vénéréologie, hôpital Arrazi, CHU Mohammed VI, Marrakech, Maroc
| | - S Amal
- Service de dermatologie et de vénéréologie, hôpital Arrazi, CHU Mohammed VI, Marrakech, Maroc
| | - M Hakkou
- Laboratoire ZOHOR d'anatomie et cytologie pathologiques, Marrakech, Maroc
| | - A Hamdaoui
- Laboratoire ZOHOR d'anatomie et cytologie pathologiques, Marrakech, Maroc
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Baino A, Akhdari N, Amal S, Hamdaoui A, Abbad F, Rais H. [Syringocystadenoma papilliferum]. Ann Dermatol Venereol 2015; 142:460-2. [PMID: 25956460 DOI: 10.1016/j.annder.2015.03.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 03/02/2015] [Accepted: 03/31/2015] [Indexed: 11/16/2022]
Affiliation(s)
- A Baino
- Service de dermatologie et vénérologie, CHU Med VI, faculté de médecine et de pharmacie, université Cadi Ayyad, Sakar, Marrakech, Maroc.
| | - N Akhdari
- Service de dermatologie et vénérologie, CHU Med VI, faculté de médecine et de pharmacie, université Cadi Ayyad, Sakar, Marrakech, Maroc
| | - S Amal
- Service de dermatologie et vénérologie, CHU Med VI, faculté de médecine et de pharmacie, université Cadi Ayyad, Sakar, Marrakech, Maroc
| | - A Hamdaoui
- Laboratoire privé « Zohor » d'anatomie et cytologie pathologiques, 70, rue de la Liberté-Guéliz, Marrakech, Maroc
| | - F Abbad
- Service d'anatomopathologie, CHU Med VI, faculté de médecine et de pharmacie, université Cadi Ayyad, Sakar, Marrakech, Maroc
| | - H Rais
- Service d'anatomopathologie, CHU Med VI, faculté de médecine et de pharmacie, université Cadi Ayyad, Sakar, Marrakech, Maroc
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El Ghali Z, Lahcen ZA, Fadili W, Kaitouni AI, Hakkou M, Hamdaoui A, Laouad I. [Late diagnosis of a primary hyperoxaluria in terminal stage of chronic renal failure with severe hypoparathyroidism]. Pan Afr Med J 2014; 17:297. [PMID: 25328593 PMCID: PMC4198285 DOI: 10.11604/pamj.2014.17.297.3076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 03/19/2014] [Indexed: 11/11/2022] Open
Affiliation(s)
- Zineb El Ghali
- Service de néphrologie - hémodialyse - transplantation rénale, hôpital ibn Tofeil, CHU Mohammed VI, Marrakech, Maroc
| | - Zineb Ait Lahcen
- Service de néphrologie - hémodialyse - transplantation rénale, hôpital ibn Tofeil, CHU Mohammed VI, Marrakech, Maroc
| | - Wafaa Fadili
- Service de néphrologie - hémodialyse - transplantation rénale, hôpital ibn Tofeil, CHU Mohammed VI, Marrakech, Maroc
| | | | | | | | - Inass Laouad
- Service de néphrologie - hémodialyse - transplantation rénale, hôpital ibn Tofeil, CHU Mohammed VI, Marrakech, Maroc
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Hocar O, Sadak M, Akhdari N, Hamdaoui A, Mouttaki T, Soussi M, Chiheb S, Riyad M, Amal S. Leishmaniose sublinguale pseudotumorale à Leishmania infantum : premier cas au Maroc. Ann Dermatol Venereol 2013. [DOI: 10.1016/j.annder.2013.01.087] [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: 11/29/2022]
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11
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Abkari I, Bouhlal Y, Latifi M, Hamdaoui A, Hakkou M. [Giant schwannoma of musculocutaneous nerve (a case report)]. ACTA ACUST UNITED AC 2013; 32:183-5. [PMID: 23538099 DOI: 10.1016/j.main.2013.02.015] [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] [Received: 07/29/2012] [Revised: 11/25/2012] [Accepted: 02/15/2013] [Indexed: 10/27/2022]
Abstract
Schwannoma is a tumor that develops from nerve sheath. The authors report an original observation of a giant schwannoma developed in the arm depending on the musculocutaneous nerve. The diagnosis was based on MRI appearance. Confirmation of the diagnosis was made by histological examination. Surgical treatment was resection, taking care preserving adjacent nerve fibers. This allowed recovery without any sequela. Recurrence rate and potential for malignant transformation of this type of tumor is low.
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Affiliation(s)
- I Abkari
- Service de chirurgie orthopédique et traumatologique (B), CHU Mohammed VI, Marrakech, Maroc.
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Hocar O, Sadak M, Akhdari N, Hamdaoui A, Riyad M, Amal S. Leishmaniose sublinguale pseudotumorale à L. Infantum : premier cas au Maroc. Ann Dermatol Venereol 2012. [DOI: 10.1016/j.annder.2012.10.565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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El Biaz S, Zahlane M, Essaadouni L, Hamdaoui A, Belaabidia B. Une présentation atypique d’une leishmaniose viscérale chez l’immunocompétent. Med Mal Infect 2008; 38:283-4. [DOI: 10.1016/j.medmal.2008.01.004] [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] [Received: 09/01/2007] [Revised: 10/17/2007] [Accepted: 01/17/2008] [Indexed: 10/22/2022]
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Latifi M, Madhar M, Belkhiat R, Hamdaoui A, Essadki B, Fikry T. [Ossifying parosteal lipoma of the rib: a case report]. Rev Chir Orthop Reparatrice Appar Mot 2003; 89:357-60. [PMID: 12844040] [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] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Ossifying parosteal lipoma is an uncommon form of parosteal lipoma. We report an exceptional rib localization where hyperosteosis probably arose from contact between the lipoma and the periosteum. Foci of metaplastic cartilage undergoing chondral ossification within the adipose tissue suggest a possible mixed origin.
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Affiliation(s)
- M Latifi
- Service de Traumatologie-Orthopédie, CHU Mohamed VI, Marrakech, Morocco
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Belaabidia B, Sellami S, Hamdaoui A, Ait Ben Kadour Y, Abbassi H. [Squamous cell carcinoma of the breast review of the literature: illustrated by the report of a case]. J Gynecol Obstet Biol Reprod (Paris) 2002; 31:34-9. [PMID: 11976575] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
We report the case of 37-year-old women with primary Squamous cell carcinoma of the right breast. The tumor was nodular, 13cm, with important hemorrhagic and necrotic reshaping. There was no central or peripheral cystic altering. Histologically, the tumoral cells were polyedric, dyskeratosic with intercellular junction. This rare breast entity has controversy histogenesis. The development was characterized by metastases frequency. The treatment remains no codified.
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Affiliation(s)
- B Belaabidia
- Département d'Anatomie Pathologique, Maroc, France.
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Vanden Broeck J, Chiou SJ, Schoofs L, Hamdaoui A, Vandenbussche F, Simonet G, Wataleb S, De Loof A. Cloning of two cDNAs encoding three small serine protease inhibiting peptides from the desert locust Schistocerca gregaria and analysis of tissue-dependent and stage-dependent expression. Eur J Biochem 1998; 254:90-5. [PMID: 9652399 DOI: 10.1046/j.1432-1327.1998.2540090.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This study describes the cloning of two cDNAs encoding three serine-protease-inhibiting peptides, SGPI I, II and III, which were recently identified from ovarian extracts of the desert locust, Schistocerca gregaria. The first cDNA codes for the precursor polypeptides of SGPI I and SGPI II; the second encodes only a single inhibitor, SGPI III. Northern-blot analysis revealed an approximate length of 0.8 kb for SGPI-I/II mRNA and 0.6 kb for SGPI-III mRNA. The transcripts are present in several locust tissues, but they could not be detected in the midgut. The gene for SGPI-I/II is abundantly transcribed during all larval and adult stages, whereas SGPI-III mRNA is mainly present in adults. Northern-blot hybridization also revealed important changes in the SGPI-mRNA content during the molting cycle and during the adult reproductive cycle. Moreover, a differential hormonal control was observed in adult females which had been treated with precocene, juvenile hormone or ecdysone.
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Affiliation(s)
- J Vanden Broeck
- Laboratory for Developmental Physiology and Molecular Biology, Leuven, Belgium.
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Schoofs L, Hamdaoui A, Devreese B, Van Beeumen J, De Loof A. The ovary of the desert locust Schistocerca gregaria contains a glycine- and proline-rich peptide that displays sequence similarities with a new class of GPRP proteins from plants. Biochem Biophys Res Commun 1998; 243:390-4. [PMID: 9480819 DOI: 10.1006/bbrc.1998.8104] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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: 02/06/2023]
Abstract
A novel, highly hydrophobic, glycine- and proline-rich peptide was characterized in the ovary of the desert locust, Schistocerca gregaria. The peptide was detected as one of the major peaks in a chromatographic separation of an acidic methanolic extract of 50 mature ovaries. Electrospray mass spectrometry yielded a molecular mass of 6305 Da. The partial amino acid sequence as determined by Edman degradation based automated microsequencing is as follows: Ala-Tyr-Pro-Ala-His-Gln-Gly-Tyr- Pro-Ala-His-Val-Gly-Tyr-Ala-Arg-Val-Gly-Tyr-Gly- Gly-Tyr-Pro-Ser-Tyr-Gly-Tyr-Pro-Ala. Four amino acids (Gly, Pro, Ala, and Tyr) account for more than 80% of the composition of this sequence. Gly-Tyr-Pro is the most important repetitive motif. Ala-Tyr-Pro, Gly-Tyr-Gly and Gly-Tyr-Ala occur as variations of this motif. The novel glycine- and proline-rich insect peptide displays structural characteristics similar to those of a new class of glycine- and proline-rich proteins (GPRP) that have recently been identified in Arabidopsis thaliana (thale cress) and Daucus carota (carrot). The GPRP of A. thaliana contains the same repetitive motifs (except for Ala-Tyr-Pro), the Gly-Tyr-Pro motif also being the most abundant.
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Affiliation(s)
- L Schoofs
- Zoological Institute, Katholieke Universiteit Leuven, Belgium.
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Hamdaoui A, Wataleb S, Devreese B, Chiou SJ, Vanden Broeck J, Van Beeumen J, De Loof A, Schoofs L. Purification and characterization of a group of five novel peptide serine protease inhibitors from ovaries of the desert locust, Schistocerca gregaria. FEBS Lett 1998; 422:74-8. [PMID: 9475173 DOI: 10.1016/s0014-5793(97)01585-8] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.1] [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: 02/06/2023]
Abstract
The ovary of the desert locust, Schistocerca gregaria, contains multiple inhibitors of serine proteases. Five serine protease inhibitors, designated SGPI-1-5 (Schistocerca gregaria protease inhibitors) were purified from methanolic extracts of mature ovaries and analyzed by mass spectrometry and amino acid sequencing. The revealed primary structures display amino acid similarities and are related to the serine protease inhibitors identified in the hemolymph of Locusta migratoria. All inhibitors show an in vitro inhibiting activity towards alpha-chymotrypsin. In addition, SGPI-1 displays in vitro inhibiting activity towards trypsin, and SGPI-2 is a potent pancreatic elastase inhibitor. Differences in inhibitory specificities towards the locust endogenous serine proteases can be readily attributed to the amino acid sequence within the active region and also to amino acid residues beyond the P1-P'1 bond. A difference in one or two amino acid residues around the reactive sites results in considerable alteration of the inhibitory specificity. The temporal and spatial distribution of SGPI-1-5 was studied by RP-HPLC analysis. All inhibitors occur in hemolymph, ovaries, testes and fat body of adults but are absent in the gut. They are also present in larval hemolymph and fat body. An antibody raised against SGPI-2 shows positive immunostaining in the ovarian follicle cells.
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Affiliation(s)
- A Hamdaoui
- Faculty of Science Semlalia, Université Cadi Ayyad, Marrakech, Morocco
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Hamdaoui A, Schoofs L, Wateleb S, Bosch LV, Verhaert P, Waelkens E, De Loof A. Purification of a novel, heat-stable serine protease inhibitor protein from ovaries of the desert locust, Schistocerca gregaria. Biochem Biophys Res Commun 1997; 238:357-60. [PMID: 9299512 DOI: 10.1006/bbrc.1997.7283] [Citation(s) in RCA: 12] [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: 02/05/2023]
Abstract
A protease-inhibitor was isolated from mature ovaries of Schistocerca gregaria by a combination of trypsin-affinity chromatography and reverse-phase high performance liquid chromatography. It was characterized by aminoterminal amino acid sequencing using Edman degradation based automated microsequencing and by MALDI-TOF mass spectrometry. The N-terminal sequence (Y)XAEXDELA(A)EEY(Y)Q(Q)X(I)(L)M (X being a Cys, an irregular or modified amino acid) revealed no similarities with any other protease inhibitors isolated from invertebrate or vertebrate source. The 14 kDa inhibitor was found to be heat-stable. It shows potent inhibitory activity toward bovine trypsin and chymotrypsin, but not toward pancreatic elastase. It is likely that the characterized inhibitor will serve as an important tool for understanding its role in insect development.
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Affiliation(s)
- A Hamdaoui
- Faculty of Science Semlalia, Université Cadi Ayyad, Avenue Molay Abdellaah, Marrakech, Boite postale S/15, Morocco
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Abstract
Pseudomonas aeruginosa may cause severe lung infections in humans. This bacteria secretes an elastase that might degrade lung elastin. We have studied the solubilization of human lung elastin by P. aeruginosa elastase in an attempt to delineate the pathogenic role of this proteinase in P. aeruginosa lung infections. We also used bovine ligamentum nuchae elastin and human leukocyte elastase for comparative purposes. With an elastin concentration of 5 mg X ml-1 and at physiologic ionic strength, P. aeruginosa elastase is about 50 times more active on human lung elastin than on bovine elastin. In contrast, human leukocyte elastase has similar specific activities on the 2 substrates. In addition, the bacterial enzyme is about 10 times more active on human elastin than the neutrophil elastase but the latter is about 5 times more active on bovine elastin than the former. In order to better quantitate these enzyme-substrate interactions, we have measured initial rates of elastolysis, derived from product versus time curves, as a function of elastin concentration. The substrate-velocity curves, analyzed using an equation similar to the classic Michaelis-Menten one, yielded 2 empirical kinetic parameters: [S50]-1, the apparent elastase-elastin affinity and Vm, the apparent catalytic efficiency of elastase. This analysis shows that human leukocyte elastase exhibits similar [S50]-1 and Vm values for the 2 elastins. The low activity of P. aeruginosa elastase on bovine elastin is due to the combined effects of low S50(-1) and Vm values, which could not be measured separately.(ABSTRACT TRUNCATED AT 250 WORDS)
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