Sticholysin I (StI), a potent cytolysin isolated from the sea anemone Stichodactyla helianthus, was linked to the monoclonal antibody (mAb) ior C5. StI acts by forming hydrophilic pores in the membrane of the attacked cells leading to osmotic lysis. ior C5 is a murine IgG1, which recognizes the tumor associated antigen (TAA) ior C2. The cytolysin and the mAb were coupled by using the heterobifunctional cross-linking reagent sulfosuccinimidyl 4-(N-maleimidomethyl)-cyclohexane-1-carboxylate (SMCC). Two hybrid molecules composed by one ior C5 and one or two StI molecules were obtained (named conjugated I and II, respectively). The purified conjugates were evaluated by a binding affinity assay against an ior C2-positive colon cancer cell line (SW948). Both molecules were able to recognize the antigen (Ag) in the same way that unconjugated ior C5 does. The activity of both conjugates against human erythrocytes and SW948 cells was assessed. They lost most of their hemolytic activity but their residual activity was very similar. Nevertheless, when their cytotoxicity was studied on the SW948 cell line, only conjugate II killed efficiently the cells, indicating a specific mAb-Ag interaction. In this chimeric molecule the ratio between the cytotoxic and the hemolytic activity was larger than that of the free cytolysin. This fact indicates an increase of the specificity of the toxic effect toward the SW948 cell line and consequently an increase of the difference between its hemolytic and cytotoxic doses. The results herein support the feasibility of directing StI to the surface of cancer cells expressing ior C2 Ag via the mAb ior C5.
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http://dx.doi.org/10.1016/j.intimp.2004.02.010 | DOI Listing |
Trends Cancer
January 2025
Institute of Oncology Research (IOR), Bellinzona Institutes of Science (BIOS+), Bellinzona, Switzerland; Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland. Electronic address:
Cancer development is driven by mutations, yet tumor-causing mutations only lead to tumor formation within specific cellular contexts. The reasons why certain mutations trigger malignant transformation in some contexts but not others remain often unclear. Both intrinsic and extrinsic factors play a key role in driving carcinogenesis by leading the cells toward a state of 'oncogenic competence'.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
February 2025
Cultural Heritage Unit, Conservation Services Division, South African National Parks, Pretoria 0002, South Africa.
The rise and spread of ancient Indian Ocean Rim (IOR) trade networks profoundly impacted southern Africa. Control over this trade played a critical role in the rise and maintenance of complex societies of the second millennium CE such as Mapungubwe and Great Zimbabwe. While the African origins of this trade lie in the first millennium CE, understanding its earliest phases and subsequent development in the far south has been hampered by a general paucity of research.
View Article and Find Full Text PDFJ Oral Implantol
January 2025
Department of Neuroscience, Reproductive Sciences and Dentistry, Federico II University of Naples, Naples, Italy.
Purpose: This pilot study evaluated and compared histomorphometric and immunohistochemical characteristics of peri-implant bone tissue after implant site preparation using piezoelectric tips versus conventional drills.
Material And Methods: Six patients with bilateral partial edentulism underwent a splitmouth protocol. Twelve alveolar ridges were randomized into six control implant sites prepared using conventional drills (Drill Group); and six test implant sites prepared using piezoelectric implant inserts (Piezo Group).
J Cogn
January 2025
University of Trier, Department of Cognitive Psychology, Germany.
Inhibition of return (IOR) refers to a location repetition cost typically observed when signaling the detection of or localizing sequentially presented stimuli repeating or changing their location. In discrimination tasks, however, IOR is often reduced or even absent; here, effects of binding and retrieval are thought to take place. Information is bound into an event file, which upon feature repetition causes retrieval, leading to partial repetition costs.
View Article and Find Full Text PDFExp Clin Endocrinol Diabetes
January 2025
Department of Pediatrics, Division of Endocrinology, Medical School, University of Patras, Patras, Greece.
Introduction: This study aimed to examine the correlation between the growth response in prepubertal children with idiopathic growth hormone (GH) deficiency after 1 year of treatment with GH to the initial clinical and biochemical parameters. Additionally, the secretion dynamics of GH was also studied by analyzing the GH stimulation test profiles in relation to the GH treatment response.
Methods: This retrospective study included 84 prepubertal children (47 males and 37 females) with a definitive diagnosis of GH deficiency.
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