Hemopoietic activities of cryopreserved murine fresh and postmortem bone marrow cells.
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Animals↗
Biomedical subjects
L Crook
Publications and source records attributed to L Crook.
Proliferative function of cadaveric bone marrow cells.
The proliferative function of human and murine cadaveric bone marrow was studied using methylcellulose clonal cell culture assays and the murine spleen colony technique. The study revealed persistence of hemopoietic functions for as long as 19 postmortem hours in cadaveric marrows of some patients. Studies of murine cadaveric marrows corresponded with those of human marrows. These results strongly suggest that human pluripotent hemopoietic stem cells survive in cadaveric marrows.
Animals↗
Correlation of platelet aggregation, plasma factor activity, and megathrombocytes in diabetic subjects with an without vascular disease.
Second-phase platelet aggregation induced by adenosine diphosphate (ADP) and epinephrine was measured in fasting platelet-rich plasma in normals, "prediabetics," and diabetics with or without vascular disease. "Plasma factor" potentiation of ADP-induced second-phase platelet aggregation was also estimated, as were megathrombocyte numbers in the same patient groups. There was an increased sensitivity of second-phase platelet aggregation noted with both aggregating agents in all diabetic groups except for the prediabetics. This activity was paralleled by an increase in plasma factor activity. In vivo evidence of an increased turnover of platelets in frank diabetics was suggested by increased numbers of megathrombocytes. These studies demonstrate that platelets from diabetics are sensitive to aggregating agents and that this sensitivity may be related to plasma factor(s) present in diabetics. In vivo platelet aggregation may be present in diabetics. Longitudinal studies will be necessary to establish the relationship of these findings to the genesis of diabetic vascular disease.
Adult↗
Increased platelet aggregation in early diabetus mellitus.
In view of the tendency toward vascular disease in diabetes mellitus, we studied platelet aggregation in 15 normal, 7 prediabetic, 12 latent, and 20 frankly diabetic subjects. Platelets from latent and frank diabetics showed increased platelet aggregation 4 minutes after adding adenosine 5'-diphosphate (60% verus 29% at 1.0 mu-M), epinephrine (46% versus 14% at 0.25 mu-M), and collagen (72% versus 17% at 0.25 mu-g/ml). Three prediabetics had increased platelet aggregation. Platelet sensitivity to aggregating agents was most marked in frank diabetics, intermediate in latent diabetics, and least in prediabetics. Second-phase platelet aggregation was reversed with acetylsalicylic acid, intravenous tolbutamide, and oral glucose administration. We conclude that platelet aggregation may be increased early in diabetes mellitus and may be involved in the genesis of diabetic microangiopathy. Prospective studies on the effect of therapeutic agents such as acetylsalicylic acid on the natural course of diabetic vascular disease are indicated.
Adenosine Diphosphate↗