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Silva MA, Souza TG, Melo MEG, Silva JM, Lima JR, Lira AFA, de Aguiar-Júnior FCA, Martins RD, Jorge RJB, Chagas CA, Teixeira VW, Teixeira ÁAC. Tityus stigmurus venom causes genetic damage in blood and testicular cells and affects the number and morphology of gametogenic lineage cells in mice. Toxicon 2020; 185:114-119. [PMID: 32659238 DOI: 10.1016/j.toxicon.2020.07.006] [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: 02/14/2020] [Revised: 07/03/2020] [Accepted: 07/07/2020] [Indexed: 11/30/2022]
Abstract
Scorpion envenomation represents an important health problem in many parts of the world, due to the high number and severity of accidents. Recent studies demonstrated that some species can produce venoms with genetic damage potential. Here, we evaluated whether Tityus stigmurus venom causes genetic damage in blood and testicular cells of Swiss mice. We also analyzed the effect of the venom on the number of spermatogenic lineage cells. Five groups of mice received 0.387 mg/kg of the venom, intraperitoneally; one group received saline solution (control group). Blood and testicular cells were collected for comet assay and histological analysis at different times after treatment (1, 2, 6, 12, and 48 h). Blood was also collected 48 h after treatment for the micronucleus test in erythrocytes. Histological analysis was performed by counting cells of the spermatogenic lineages; the nuclear area of elongated spermatocytes was also evaluated. Treatment with the venom induced DNA damage that endured from 1 h to 48 h, as confirmed by the comet assay. The micronucleus test demonstrated that the venom induced mutations in erythrocytes. The number of spermatogonia and rounded spermatids decreased in some groups; the number of elongated spermatids increased, and their nuclear size decreased 1 h after treatment. Genetic damage can be caused directly by the venom, but we suggested that reactive oxygen species that result from inflammatory process caused by the envenomation may have an important role in the DNA damage. Genetic damage and apoptosis may explain the changes in the number of spermatogenic cells. Furthermore, the decrease in nuclear area may result from chromatin loss. Genetic damage in testicular cells, associated with alterations in the number and morphology of spermatogenic cells, can result in reproduction disorders in animals, or humans, stung by T. stigmurus.
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Affiliation(s)
- Meykson A Silva
- Programa de Pós-Graduação Em Ciência Animal Tropical, Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco - UFRPE, Recife, PE, Brazil; Centro Acadêmico de Vitória, Universidade Federal de Pernambuco-UFPE, Vitória de Santo Antão, PE, Brazil.
| | - Talita G Souza
- Centro Acadêmico de Vitória, Universidade Federal de Pernambuco-UFPE, Vitória de Santo Antão, PE, Brazil
| | - Maria E G Melo
- Centro Acadêmico de Vitória, Universidade Federal de Pernambuco-UFPE, Vitória de Santo Antão, PE, Brazil
| | - Jeanderson M Silva
- Centro Acadêmico de Vitória, Universidade Federal de Pernambuco-UFPE, Vitória de Santo Antão, PE, Brazil
| | - José R Lima
- Centro Acadêmico de Vitória, Universidade Federal de Pernambuco-UFPE, Vitória de Santo Antão, PE, Brazil
| | - André F A Lira
- Programa de Pós-Graduação Em Ciência Animal Tropical, Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco - UFRPE, Recife, PE, Brazil
| | | | - René D Martins
- Centro Acadêmico de Vitória, Universidade Federal de Pernambuco-UFPE, Vitória de Santo Antão, PE, Brazil
| | - Roberta J B Jorge
- Departamento de Fisiologia e Farmacologia, Faculdade de Medicina, Universidade Federal Do Ceará - UFC, Fortaleza, CE, Brazil
| | - Cristiano A Chagas
- Centro Acadêmico de Vitória, Universidade Federal de Pernambuco-UFPE, Vitória de Santo Antão, PE, Brazil
| | - Valéria W Teixeira
- Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco - UFRPE, Recife, PE, Brazil
| | - Álvaro A C Teixeira
- Programa de Pós-Graduação Em Ciência Animal Tropical, Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco - UFRPE, Recife, PE, Brazil; Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco - UFRPE, Recife, PE, Brazil
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Simões TN, Silva ACD, Santos EMD, Chagas CA. Temperatura de incubação e razão sexual em filhotes recém-eclodidos da tartaruga marinha Eretmochelys imbricata (Linnaeus, 1766) no município do Ipojuca, Pernambuco, Brasil. Pap Avulsos Zool (São Paulo) 2014. [DOI: 10.1590/0031-1049.2014.54.25] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Fernandes T, de Angelo-Andrade LA, Morais SS, Pinto GA, Chagas CA, Maria-Engler SS, Zeferino LC. Stromal cells play a role in cervical cancer progression mediated by MMP-2 protein. EUR J GYNAECOL ONCOL 2008; 29:341-344. [PMID: 18714566] [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: 05/26/2023]
Abstract
Metalloproteinases, especially metalloproteinase-2 (MMP-2), are known for their role in the degradation of the extracellular matrix. Nevertheless, a thorough understanding of MMP-2 expression in neoplastic lesions of the uterine cervix has yet to be accomplished. This study aimed to analyze the MMP-2 expression in cervical intraepithelial neoplasia III (CIN3) and in cervical squamous cell carcinoma, in tumor cells and adjacent stromal cells. MMP-2 expression was assessed by an immunohistochemical technique. MMP-2 expression was greater in the stromal cells of invasive carcinomas than in CIN3 (p < 0.0001). MMP-2 expression in stromal cells correlates with the clinical stage, gradually increasing as the tumor progresses (p = 0.04). This study corroborates that stromal cells play an important role in tumor invasion and progression, mediated by the progressive enhancement of MMP-2 expression from CIN3 to advanced invasive tumor. The intense MMP-2 expression most probably is associated with poor tumor prognosis.
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Affiliation(s)
- T Fernandes
- Department of Obstetrics and Gynecology, State University of Campinas, Campinas, CP, Brazil
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Schenka AA, Machado CML, Grippo MC, Queiroz LS, Schenka NGM, Chagas CA, Verinaud L, Brousset P, Vassallo J. Immunophenotypic and ultrastructural validation of a new human glioblastoma cell line. Cell Mol Neurobiol 2005; 25:929-41. [PMID: 16133944 DOI: 10.1007/s10571-005-4959-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2004] [Accepted: 02/03/2005] [Indexed: 12/20/2022]
Abstract
1. A human glioma cell line, NG97, was established by Grippo et al. in 2001 from tissue obtained from a grade III astrocytoma (WHO, 2000). In this first study, the cell line grew as two morphologically distinct subpopulations: dendritic/spindle cells and small round cells. The injection of NG97 cells into nude mice induced an aggressive tumor characterized by: severe cytological atypia, vascular proliferation and pseudopalisading necrosis (glioblastoma multiforme features). 2. The purpose of the present study was to characterize the immunophenotype and ultrastructural aspects of this cell line, using the parental tumor, cultured cells and the xenotransplant, in order to assess its glial nature and possible divergent differentiation. 3. NG97 cells and xenotransplant expressed the main neuroglial markers (GFAP, S-100 protein, NSE and Leu-7) and showed no aberrant expression of other histogenetic markers. GFAP was similarly expressed in the parental tumor and in the cells in culture, but decreased in the xenotransplant. NSE expression was reduced in NG97 cells, but substantially recovered in the xenotransplant. This variability in expression of GFAP and NSE was interpreted as either a phenomenon of dedifferentiation or to microenvironmental selection of specific subclones. S-100 was equally expressed in the three contexts. The xenotransplant's ultrastructural features were those of a highly undifferentiated tumor. No significant immunophenotypic or ultrastructural differences between the two morphologically distinct populations were found. 4. Thus, our data demonstrate that NG97 cells constitute a pure glial-committed cell line, which may prove useful as a malignant glioma model in studies addressing pathophysiological, diagnostic and therapeutic issues.
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Affiliation(s)
- André A Schenka
- Departamento de Anatomia Patológica, Faculdade de Ciências Médicas (FCM), Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6111, Campinas, São Paulo, EP 13084-971, Brasil.
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Vassallo J, Godoy CE, Godoy CE, Chagas CA, Metze K, Trevisan MAS. Immunoexpression of CD95 in chronic gastritis and gastric mucosa-associated lymphomas. Braz J Med Biol Res 2004; 37:1397-401. [PMID: 15334206 DOI: 10.1590/s0100-879x2004000900015] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
CD95 (Fas/APO-1)-mediated apoptosis plays an important role in immunological regulation and is related to the pathogenesis of autoimmune diseases. Immunoexpression of CD95 has been reported to frequently occur in low grade non-Hodgkin lymphomas, especially of post-germinal center histogenesis, among which those originating in mucosa-associated lymphoid tissue (MALT lymphomas). However, there is no report comparing in situ immunoexpression of this marker in lymphomas and the hyperplastic lymphoid reaction (chronic gastritis) related to Helicobacter pylori infection. The purpose of the present research was to compare the intensity of lymphoid CD95 immunoexpression in 15 cases of H. pylori-related chronic gastritis and 15 gastric MALT lymphomas. CD95 (anti-CD95) was detected by an immunoperoxidase technique in paraffin sections using the catalyzed amplification system. Graduation of reaction intensity (percentage of CD95-positive cells) was semiquantitative, from 1+ to 4+. Nine cases of chronic gastritis were 4+, five 2+ and one 1+. Three lymphomas were 4+, three 3+, four 2+, four 1+, and one was negative. Although 14 of 15 lymphomas were positive for CD95, the intensity of the reaction was significantly weaker compared to that obtained with gastric tissue for patients with gastritis (P = 0.03). The difference in CD95 immunoexpression does not seem to be useful as an isolated criterion in the differential diagnosis between chronic gastritis and MALT lymphomas since there was overlapping of immunostaining patterns. However, it suggests the possibility of a pathogenetic role of this apoptosis-regulating protein in MALT lymphomas.
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Affiliation(s)
- J Vassallo
- Departamento de Anatomia Patológica, Faculdade de Ciências Médicas, Universidade Estadual de CampinasCampinas, SP, Brasil.
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Vassallo J, Pinto GA, Alvarenga JM, Zeferino LC, Chagas CA, Metze K. Comparison of Immunoexpression of 2 Antibodies for Estrogen Receptors (1D5 and 6F11) in Breast Carcinomas Using Different Antigen Retrieval and Detection Methods. Appl Immunohistochem Mol Morphol 2004; 12:177-82. [PMID: 15354746 DOI: 10.1097/00129039-200406000-00014] [Citation(s) in RCA: 20] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The importance of in situ immunodetection of hormone receptors for therapy planning and prognostic evaluation in patients with breast carcinoma is well established. Sensitive detection methods are of utmost importance, especially in poorly fixed tissues, which are not uncommon in routine pathologic practice. The purpose of the present study is to compare immunoexpression of estrogen receptors in 20 cases of invasive ductal carcinoma using two antibodies, 1D5 and 6F11, and to verify the effect of different antigen retrieval solutions and detection systems. Immunoperoxidase was performed on paraffin sections using 1D5 and 6F11 as primary antibodies. Heat-induced antigen retrieval was performed using citrate buffer (pH 6.0) or Tris-EDTA buffer (pH 8.9). Detection was achieved using the following systems: EnVision, EnVision Plus, and labeled streptavidin-biotin peroxidase complex. Reaction was semiquantified from 0 to 4. There were no differences between the two markers, 1D5 and 6F11, except when 6F11 was used with EnVision and citrate buffer, in which case weaker reactivity was observed. Only in this combination (6F11/EnVision) was EDTA buffer significantly better than citrate. Labeled streptavidin-biotin peroxidase complex presented the best results, followed by EnVision Plus.
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Affiliation(s)
- J Vassallo
- Anatomic Pathology, Faculty of Medical Sciences, State University of Campinas, São Paulo, Brazil
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