It should be pointed out that decreased levels of platelet serotonin have been reported in many different pathological or debilitating conditions, notably in psychiatric and neurologic diseases, and thus platelet serotonin levels in ALS, as observed decreased here, should not be considered as a specific biomarker of ALS.
With a longer bleeding time and decreased level of platelets, these deficits could explain why only 22.4% of animals that survived at weaning carried the App-Runx1 deletion.
sPLA2 activity was increased in all patients, especially pSS patients with extra-glandular involvement who showed a significantly decreased level of platelet MPs.
An interesting finding was the significantly decreased level of platelet MPs in pSS patients with more severe disease corresponding to extra-glandular involvement compared with those with glandular involvement only.
Other findings from this experimental study are consistent with our results, showing decreased levels of RBC, hematocrit, mean platelet volume, and WBC [ 14].
Besides disordered hemoglobin structure and function, a prothrombotic state due to changes in the hemostatic system, such as thrombin activation, decreased levels of anticoagulants, impaired fibrinolysis, and platelet activation are also involved in the pathogenesis of sickle cell disease [ 106].
For example, rats show decreased levels of 5-HT both in platelet-rich plasma and in brain homogenates after the forced swim test (FST), used to assess antidepressant efficacy.
The δ-SPD platelets have decreased levels of the dense granule contents: ATP and ADP, serotonin, calcium and pyrophosphate (Fig. 1c).
Catheter thrombosis on the fibrin sheath may be facilitated by platelet activation, decreased levels of protein C and antithrombin III, hyperfibrinogenemia, and homocysteine elevation.
