ABSTRACT
γ-Glutamyltranspeptidase (GGT, syn. γ-Glutamyltransferase) and dipeptidylpeptidase-IV (DPP-IV) activity participates in metabolic and growth control of normal and tumor cells by processing biologically active peptides. Here, we report on up-regulation of these enzymes in human brain gliomas determined by catalytic enzyme histochemistry and immunocytochemistry. Higher activity of GGT was found in 50%, 68% and 81% of WHO grade II, III and IV tumors, respectively. The process started at/near the microvasculature, from where it spread to the parenchyma. On average, the enzyme activity in grade II, III and IV gliomas exceeded controls 2.0, 3.0 and 3.5-fold, respectively. Up-regulation of DPP-IV-like activity also started at the microvasculature, but mainly in pericytes and mononuclear-like cells around the vessels and dispersed in the parenchyma. Marked elevation of this enzyme activity, comprising also tumor parenchyma, occurred only in grade IV glioblastomas (65% patients; 3.6 times above controls) which can, therefore, help in their differentiation from grade III gliomas. The increase of total DPP-IV-like activity also included its two enzymatic homologs, the canonical DPP-IV/CD26 and FAP-1α. The increase in GGT is supposed to be a tumor grade dependent response of microvasculature and tumor astrocytes to stress induced by tissue hypoxia and/or the metabolic aberrancies. The increase in DPP-IV-like activity in high-grade tumors can be attributed to inflammatory/scavenging processes performed by the mononuclear-like cells and, in glioblastomas, also to regressive changes in the structure and function of the microvasculature and tumor parenchyma, including astrocyte stress response. The inverse relationship between DPP-IV-like activity and Ki67 in most glioblastomas and shorter survival time of patients with low activity of this enzyme also suggest its anti-oncogenic effects.
Subject(s)
Brain Neoplasms/enzymology , Dipeptidyl Peptidase 4/biosynthesis , Glioma/enzymology , gamma-Glutamyltransferase/biosynthesis , Adult , Aged , Aged, 80 and over , Biomarkers, Tumor/analysis , Brain Neoplasms/pathology , Female , Glioma/pathology , Humans , Immunohistochemistry , Male , Middle Aged , Neoplasm Grading , Prognosis , Up-Regulation , Young AdultABSTRACT
OBJECTIVE: The purpose of this study were to determine the effects and consequences of premature pregnancy and childbirth among adolescents under 15 years of age in French Guyana. MATERIAL AND METHODS: A retrospective field-case study between the 1(st) and the 31(st) December 2001 identified 181 births among adolescents aged 14 years and under. Comparisons were made with 181 births among 18-year-old first-time mothers taking place over the same period. RESULTS: 1.55% of all births in the maternity ward at St Laurent-du-Maroni Hospital involved adolescents under the age of 15. 24.6% of these young mothers were enrolled in secondary school, 21% were beneficiaries of the national social security health insurance and 61% of them were born outside Guyana. Pre-natal monitoring was less frequent among the group of teenage mothers, and preterm labor (0.04 < p < 0.05), anemia (0.02 < p < 0.03) and Chlamydiae trachomatis infections (0.03 < p < 0.04) are more frequent. There is no significant difference regarding high blood pressure, diabetes, or infectious diseases (except from Chlamydiae) or regarding labor and delivery. Mean birth weight was lower (p = 0.01) and the Apgar score was more often less than 7 at the first minute (p < 0.05) among newborn of teenage mothers. CONCLUSION: While pregnancies among younger teenagers appear to indicate a higher level of associated medical problems, a more thorough pre-natal check-up program would certainly reduce the number of problem related cases. The extremely high proportion of teenage pregnancies in the West of French Guiana has become a major public health issue for the entire region.