We have investigated the mechanism of splenic irradiation-induced granulocytopenia in two patients with myelofibrosis and marked splenomegaly. Serial assays were performed for circulating granulocyte-monocyte progenitors capable of colony formation in vitro (CFU-C). For comparison, similar studies were performed on two patients receiving whole brain irradiation for glioma. Splenic irradiation caused a significant decrease in circulating CFU-C in the myelofibrosis patients. There was no decrease in circulating CFU-C in the brain-irradiated patients. No radiation-induced humoral inhibitor of granulopoiesis and no increased CFU-C radiosensitivity could be demonstrated in the myelofibrosis patients. These observations, taken together with previous data on splenic blood flow and pooling, suggest that the major mechanism of irradiation-induced granulocytopenia in myelofibrosis is destruction of proliferating precursor cells in the splenic tissue and sinusoids.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/j.1365-2141.1979.tb03721.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The Changes of Lymphocytes and Immune Molecules in Irradiated Mice by Different Doses of Radiation.
Health Phys
January 2025
Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China.
The effects of different radiation doses on T and B lymphocyte functional subsets and the changes of immune cells and immune molecules were observed in mice at different times post-irradiation to provide a theoretical basis for the changes of immune cells affected by radiation. In this study, the changes of T and B immune cells and immune-related molecules were observed at 1, 3, 7, 14, and 21 d after single irradiation of 2 Gy, 4 Gy, and 6 Gy. The results showed that white blood cells (WBC), lymphocytes (LYMPH), and lymphocyte percentage (LYMPH%) in peripheral blood of mice were significantly reduced and reached the lowest point 3 d after irradiation.
View Article and Find Full Text PDFMechanisms of Antitumor Activity of Low Doses of Radiation Associated with Activation of Cells' Defense System.
Dokl Biochem Biophys
January 2025
State Research Center-Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency, 123098, Moscow, Russia.
Background: The effects of ionizing radiation (IR) involve a highly orchestrated series of events in cells, including DNA damage and repair, cell death, and changes in the level of proliferation associated with the stage of the cell cycle. A large number of existing studies in literature have examined the activity of genes and their regulators in mammalian cells in response to high doses of ionizing radiation. Although there are many studies, the research in effect of low doses of ionizing radiation remains limited.
View Article and Find Full Text PDFCase report: Cancer-free survival after chemotherapy, targeted immunotherapy combination with proton therapy following space making technique in a patient with cholangiocarcinoma after choledochal cyst resection.
Front Immunol
January 2025
Department of Hepatobiliary-Pancreatic-Splenic Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.
Choledochal cysts (CCs) are rare cystic dilations of the intrahepatic and/or extrahepatic bile ducts. Malignancies arising during follow-up after excision of CCs have been reported in both children and adults, with no typical time frame for malignancy development. We present a case of a patient diagnosed with CCs 36 years ago, who underwent resection and subsequently developed cancer.
View Article and Find Full Text PDFChitosan/γ-PGA nanoparticles and IFN-γ immunotherapy: A dual approach for triple-negative breast cancer treatment.
J Control Release
January 2025
i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal; INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal; ICBAS - Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal.
Interferon-γ (IFN-γ) is a key mediator in antitumor immunity and immunotherapy responses, yet its clinical applications remain restricted to chronic granulomatous disease and malignant osteopetrosis. IFN-γ effectiveness as a standalone treatment has shown limited success in clinical trials and its potential for synergistic effects when combined with immunotherapies is under clinical exploration. A particularly compelling combination is that of IFN-γ with Toll-like receptor (TLR) agonists that holds significant promise for cancer treatment.
View Article and Find Full Text PDFTotal Pancreatectomy for Locally Advanced Pancreatic Adenocarcinoma with Coeliac Trunk Resection and Retrograde Gastric Revascularization Through Aorto-Hepato-Spleno Allograft.
Ann Surg Oncol
January 2025
Department of HPB Surgery and Liver Transplantation, Hôpital Beaujon, Assistance Publique-Hôpitaux de Paris (AP-HP), Université de Paris-Cité, Clichy, France.
Background: Locally advanced pancreatic adenocarcinomas (LA-PDAC) are more frequently operated now than in the past because of new regimen chemotherapy and improvement in surgical technique. Resection of the coeliac trunk (CT) during pancreatoduodenectomy (PD) or total pancreatectomy (TP) is not routinely done owing to the risk of liver and gastric ischaemia. In this video, a patient with LA-PDAC underwent TP with CT resection and retrograde gastric revascularization through the distal splenic artery.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!