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Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
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Cytotoxic Edema: Pathophysiology

Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous supply...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
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Related Experiment Video

Updated: Jun 1, 2026

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy
12:04

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

Published on: August 14, 2012

Cytotoxic steroids from Sarcococca saligna.

Yu-Xin Yan1, Yun Sun, Jian-Chao Chen

  • 1State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, P. R. China.

Planta Medica
|May 19, 2011
PubMed
Summary
This summary is machine-generated.

Two new steroidal compounds and two new steroidal alkaloids were isolated from Sarcococca saligna. Some compounds exhibited significant cytotoxic activity against various cancer cell lines, warranting further investigation.

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Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy
12:04

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

Published on: August 14, 2012

Area of Science:

  • Natural Products Chemistry
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Sarcococca saligna is a plant source of bioactive compounds.
  • Steroidal compounds and alkaloids are known for their diverse pharmacological properties.

Purpose of the Study:

  • To isolate and characterize new steroidal compounds and alkaloids from Sarcococca saligna.
  • To evaluate the cytotoxic potential of isolated compounds against human cancer cell lines.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS).
  • Cytotoxicity assays using K562, SK-BR-3, PANC-1, and HL-60 cell lines.

Main Results:

  • Two new C₂₁-steroidal esters (sarsaligates A and B) and two new steroidal alkaloids (sarsaligenines A and B) were identified.
  • Four known compounds were also isolated: sarcovagine, sarcorucinine, dimethylamino-3 β-pregnane-20-one, and β-sitosterol.
  • Compounds 5 and 6 showed potent cytotoxicity against K562, SK-BR-3, and PANC-1 cells (IC₅₀: 2.25–5.00 µM).
  • Compounds 3 and 4 selectively inhibited HL-60 cells (IC₅₀: 2.87 and 3.61 µM, respectively).

Conclusions:

  • Sarcococca saligna is a rich source of novel steroidal compounds with cytotoxic properties.
  • Compounds 3-6 demonstrate significant cytotoxic potential and warrant further evaluation for anticancer drug development.