Question: Is Annexin V an apoptotic marker?

Context:
The apoptosis of the MSCs was induced by subjecting the cells to OGD conditions for 4 h and was detected by Annexin V/PI and Hoechst 33258 staining. 
In addition to the antimicrobial activity, we found that treatment of the cancer cell lines, Jurkat T-cells, Granta cells, and melanoma cells, with the Pseudomonas sp. In5 crude extract increased staining with the apoptotic marker Annexin V while no staining of healthy normal cells, i.e., naïve or activated CD4 T-cells, was observed.
At the same time, the expressions of CD105, CD31, and the apoptotic marker of Annexin V were detected through flow cytometry for analyzing the relationship between the expression of cell surface markers and biological behavior.
However, we found decreased sperm concentration, increase of morphologically abnormal spermatozoa and increased binding of apoptotic marker annexin V. 
hCG enhanced viability of granulosa-lutein cells through antiapoptosis but not proliferation, because the apoptotic marker of annexin V was decreased, but the proliferative markers of Ki67 and proliferating cell nuclear antigen were not increased.
However, as the DOTAP concentration increased from 50 to 800 microM, the apoptotic marker Annexin V and ROS double positive cells increased, suggesting that high dose of DOTAP-generated ROS causes cell apoptosis. 
Expression of the apoptotic marker annexin V was unaffected by antibiotic exposure, whereas the uptake of the necrotic marker PI was increased by ofloxacin (5 mg/mL) but not by netilmicin (ofloxacin versus netilmicin, ANOVA, P<0.05).
he apoptotic marker of annexin V was decreased
the apoptotic marker Annexin V
Annexin V labels apoptotic neurons following hypoxia-ischemia.
In the present study, the apoptotic cell population was identified immunocytochemically using Annexin V, a marker of cells in an early stage of apoptosis.
Use of annexin V antibody to identify apoptotic cells during pregnancy.
Only few SF Treg cells were apoptotic, as indicated by limited annexin V staining of these cells.
Eosinophils 'aged' in vitro for 48 h exhibited endonuclease DNA degradation, apoptotic morphology, increased red autofluorescence and externalisation of phosphatidylserine (PS) as assessed by binding of FITC-labelled annexin V.
In vivo detection of apoptotic cells with fluorescently labeled annexin V is an emerging technique that we evaluated for detecting apoptotic germ cells in a mouse model of testicular torsion.Annexin V labeled with an indocyanine fluorophore (bisfunctional succinimidyl ester of cyanine 5.5) (Amersham, Little Chalfont, United Kingdom) was injected intravenously in mice 18 hours after the repair of unilateral 720-degree testicular torsion for 2 hours
Here, we tested the hypothesis that enhanced endothelial apoptotic microparticles and decreased endothelial progenitor cell (EPC) levels might contribute to the pathophysiology of microalbuminuria or macroalbuminuria in cardiovascular disease.Flow cytometry was used to assess endothelial cell apoptosis and circulating EPC levels by quantification of circulating CD31/annexin V apoptotic microparticles and EPC markers (defined as KDRCD133, CD34CD133, CD34KDR) in peripheral blood.In total, 125 patients with hypertension were enrolled in the study, of whom 80 patients (64%) were with normoalbuminuria (albumin excretion rate of &lt;20 microg/min, overnight urine samples), 35 patients (28%) with microalbuminuria (an albumin excretion rate of 20-200 microg/min), and 10 patients (8%) with macroalbuminuria (an albumin excretion rate >200 microg/min).
Surfactant protein A (SP-A) binds to phosphatidylserine and competes with annexin V binding on late apoptotic cells
Targeting of apoptotic macrophages and experimental atheroma with radiolabeled annexin V: a technique with potential for noninvasive imaging of vulnerable plaque
Because annexin V has a high affinity for exposed phosphatidylserine on apoptotic cells, radiolabeled annexin V may be used for noninvasive detection of apoptosis in atherosclerotic lesions.Atherosclerotic plaques were produced in 5 rabbits by deendothelialization of the infradiaphragmatic aorta followed by 12 weeks of cholesterol diet; 5 controls were studied without manipulation
Apoptotic abscess imaging with 99mTc-HYNIC-rh-Annexin-V.
Synthesis and evaluation of a 18F-labelled recombinant annexin-V derivative, for identification and quantification of apoptotic cells with PET.
Sensitive and visible detection of apoptotic cells on Annexin-V modified substrate using aminophenylboronic acid modified gold nanoparticles (APBA-GNPs) labeling.
Fluorescence-activated cell sorting (FACS) for expression of the early apoptosis marker Annexin V and for nuclear staining by 7-aminoactinomycin (7-AAD) revealed different extents of apoptosis versus non-apoptotic cell death for the three agents.
At immunofluorescence these cells contained lipid vesicles positive for the apoptotic cell marker Annexin V suggesting the phagocytosis of apoptotic bodies derived from dead fat-laden hepatocytes.
In this respect, we identified binding of Annexin V as an convenient marker for apoptotic cells.
DR5 expression was elevated and associated with the apoptotic marker annexin V. Apoptosis was reduced in CD4(+) T cells when cultured with anti-DR5 antibody.
Flow cytometric analysis using the apoptotic marker, Annexin V, shows that this endogenous re-expression is sufficient to drive the SCLC cells to apoptosis.
Apoptotic cell death was evaluated by staining nuclei with propidium iodide and phosphatidylserine (a marker of early apoptotic events) with Annexin V as well as by DNA fragmentation assay.
Decreased cell growth was not caused by cell death as BEL exposure did not alter nuclear morphology or increase annexin V (apoptotic cell marker) or propidium iodide (necrotic cell marker) staining after 48 h.
Four populations of cells can be identified: region R1: vital cells (annexin V negative/PI negative), region R2: apoptotic cells (annexin V positive/PI negative), region R3: dead cells (annexin V positive/ PI positive); and region R4: damaged cells (annexin V negative/PI positive).
Furthermore, uptake of (111)In-DTPA-PEG-annexin V by tumors correlated with apoptotic index (r = 0.87, P = 0.02).
Annexin V(+)/PI(-) cells were characterized as early apoptotic, Annexin V(+)/PI(+) as late apoptotic and Annexin V(-)/PI(+) as dead.
Targeting ability of Annexin V for apoptotic macrophages was kept and enhanced.
[18F]annexin V accumulated in the infarct area of the left ventricle, where apoptotic cells were observed.
The viability of SiHa cells was evaluated using the MTT assay, apoptosis by acridine orange/ethidium bromide, propidium iodide, TUNEL assay, and Annexin V-Cy3, cell cycle distribution and mitochondrial transmembrane potential using flow cytometry, and apoptotic marker genes using quantitative real-time PCR. 
Furthermore, hesperetin-induced apoptosis was confirmed by TUNEL and Annexin V-Cy3.
The procedure delivers two sperm fractions: annexin V-negative (nonapoptotic) and annexin V-positive (apoptotic).
The percentage of cells stained with annexin V, an early apoptotic marker, increased dramatically after cytoskeletal disruption with cytochalasin D compared with non-cytochalasin-D-treated controls (P<0.05). 
Apoptotic marker Annexin V analysis showed that the apoptotic rate of NB4 cells was increased after treatment with quercetin.
The cytomorphology of NB4 cells was assessed by Wright-stain, apoptosis rate by apoptotic marker Annexin V, and VEGF secretion level by ELISA.
 We have coupled annexin V with the bifunctional hydrazinonicotinamide reagent (HYNIC) to prepare technetium-99m HYNIC-annexin V and demonstrated localization of radioactivity in tissues undergoing apoptosis in vivo.
In conlusion, these studies confirm the value of (99m)Tc-HYNIC-annexin V uptake as a marker for the detection and quantification of apoptotic cells in vivo.
The application of Annexin V labeling at electron microscopy will allow a more refined description of the morphological events occurring during apoptosis.
Apoptotic cells were identified by Annexin V-FITC/PI staining. 

Answer: Yes, annexin V is an early apoptotic marker., Yes, Annexin V is an apoptotic marker.
Exact answer: yes