Protamine reversal of heparin anticoagulation in patients is occasionally associated with life-threatening acute pulmonary hypertension. In a sheep model, we evaluated the effect on this adverse cardiopulmonary reaction of modifying the type of heparin (low molecular weight heparin compared with unfractionated heparin) and the type of heparin antagonist (polybrene compared with protamine). Prot...

Human mesenchymal stem cells (hMSCs) can be engineered to express specific genes, either for their use in cell-based therapies or to track them in vivo over long periods of time. To obtain long-term expression of these genes, a lentivirus- or retrovirus-mediated cell transduction is often used. However, given that the efficiency with these viruses is typically low in primary cells, additives su...

Mesenchymal stem cells (MSCs) are multipotent progenitors, which can undergo self-renewal and give rise to multi-lineages. A great deal of attentions have been paid to their potential use in regenerative medicine as potential therapeutic genes can be introduced into MSCs. Genetic manipulations in MSCs requires effective gene deliveries. Recombinant adenoviruses are widely used gene transfer vec...

In two groups of patients undergoing extracorporeal circulation with hypothermia, changes were found in the coagulation mechanism which were probably due to the dosage of polybrene administered. The role of heparin and polybrene and the concept of activation of the coagulation mechanism in the production of bleeding after perfusion are discussed.

An acute hemolytic transfusion reaction (AHTR) occurred in a 28-yr-old gravida immediately after transfusion with leukocyte-reduced red cells. The patient gave no history of prior transfusion. Initial serologic testing by the polybrene method was negative for both antibody screening and cross-matching. Further testing by the indirect anti-globulin test (IAT) demonstrated the presence of anti-Jk...

A low-ionic strength-Polybrene (LISP) AutoAnalyzer haemagglutination channel (Lalezari, 1968; Perrault and Hogman, 1971) fails to detect a proportion of antibodies, particularly anti-KI, anti-Lewis, and anti-P1, which can be demonstrated by manual techniques (Moore and Perrrault, 1977). Moore et al. (1977) found that when dialysis was used instead of dilution to achieve a low ionic-strength rea...

BACKGROUND Lupus anticoagulants prolong clotting times in phospholipid-dependent coagulation tests. Lupus Ratio assays are integrated tests for lupus anticoagulants that may be based on APTT, RVVT or dPT clotting times. If a patient is being treated with unfractionated heparin, however, the heparin prolong clotting times and the diagnosis of lupus anticoagulant is invalidated. Commercial assays...

Polybrene treatment of McCoy cells was used to increase the infectivity of Chlamydia trachomatis in vitro. The isolation rate for C. trachomatis in 500 specimens from males and females attending a sexually transmitted disease clinic and other clinics increased by 6.8% with the Polybrene treatment. The data also suggested that this treatment facilitated the diagnosis of low grade or latent infec...