Imaging mass spectrometry of diversified cardiolipin molecular species in the brain.

MALDI imaging mass spectrometry (MALDI-IMS) has been used successfully in mapping different lipids in tissue sections, yet existing protocols fail to detect the diverse species of mitochondria-unique cardiolipins (CLs) in the brain which are essential for cellular and mitochondrial physiology. We have developed methods enabling the imaging of individual CLs in brain tissue. This was achieved by eliminating ion suppressive effects by (i) cross-linking carboxyl/amino containing molecules on tissue with 1-ethyl-3-[3-(dimethylamino)propyl]-carbodiimide hydrochloride and (ii) removing highly abundant phosphatidylcholine head groups via phospholipase C treatment. These treatments allowed the detection of CL species at 100 µm resolution and did not affect the amount or molecular species distribution of brain tissue CLs. When combined with augmented matrix application, these modifications allowed the visualization and mapping of multiple CL species in various regions of the brain including the thalamus, hippocampus, and cortex. Areas such as the dentate and stratum radiatum exhibited higher CL signals than other areas within the hippocampal formation. The habenular nuclear (Hb)/dorsal third ventricle (D3 V) and lateral ventricle (LV) areas were identified as CL "hot spots". Our method also allowed structural MS/MS fragmentation and mapping of CLs with identified fatty acid residues and demonstrated a nonrandom distribution of individual oxidizable (polyunsaturated fatty acid containing) and nonoxidizable (nonpolyunsaturated containing) CLs in different anatomical areas of the brain. To our knowledge, this method is the first label-free approach for molecular mapping of diversified CLs in brain tissue.

Improved spatial resolution of matrix-assisted laser desorption/ionization imaging of lipids in the brain by alkylated derivatives of 2,5-dihydroxybenzoic acid.

RATIONALE: Matrix-assisted laser desorption/ionization (MALDI) is one of the major techniques for mass spectrometry imaging (MSI) of biological systems along with secondary-ion mass spectrometry (SIMS) and desorption electrospray mass spectrometry (DESI). The inherent variability of MALDI-MSI signals within intact tissues is related to the heterogeneity of both the sample surface and the matrix crystallization. To circumvent some of these limitations of MALDI-MSI, we have developed improved matrices for lipid analysis based on structural modification of the commonly used matrix 2,5-dihydroxybenzoic acid (DHB). METHODS: We have synthesized DHB containing -C6H13 and -C12H25 alkyl chains and applied these matrices to rat brain using a capillary sprayer. We utilized a Bruker Ultraflex II MALDI-TOF/TOF mass spectrometer to analyze lipid extracts and tissue sections, and examined these sections with polarized light microscopy and differential interference contrast microscopy. RESULTS: O-alkylation of DHB yields matrices, which, when applied to brain sections, follow a trend of phase transition from crystals to an oily layer in the sequence DHB → DHB-C6H13 → DHB-C12H25 . MALDI-MSI images acquired with DHB-C12H25 exhibited a considerably higher density of lipids than DHB. CONCLUSIONS: Comparative experiments with DHB and DHB-C12H25 are presented, which indicate that the latter matrix affords higher lateral resolution than the former.

Formation of protein adducts with Hydroperoxy-PE electrophilic cleavage products during ferroptosis.

Ferroptosis is an iron dependent form of cell death, that is triggered by the discoordination of iron, lipids, and thiols. Its unique signature that distinguishes it from other forms of cell death is the formation and accumulation of lipid hydroperoxides, particularly oxidized forms of polyunsaturated phosphatidylethanolamines (PEs), which drives cell death. These readily undergo iron-catalyzed secondary free radical reactions leading to truncated products which retain the signature PE headgroup and which can readily react with nucleophilic moieties in proteins via their truncated electrophilic acyl chains. Using a redox lipidomics approach, we have identified oxidatively-truncated PE species (trPEox) in enzymatic and non-enzymatic model systems. Further, using a model peptide we demonstrate adduct formation with Cys as the preferred nucleophilic residue and PE(26:2) +2 oxygens, as one of the most reactive truncated PE-electrophiles produced. In cells stimulated to undergo ferroptosis we identified PE-truncated species with sn-2 truncations ranging from 5 to 9 carbons. Taking advantage of the free PE headgroup, we have developed a new technology using the lantibiotic duramycin, to enrich and identify the PE-lipoxidated proteins. Our results indicate that several dozens of proteins for each cell type, are PE-lipoxidated in HT-22, MLE, and H9c2 cells and M2 macrophages after they were induced to undergo ferroptosis. Pretreatment of cells with the strong nucleophile, 2-mercaptoethanol, prevented the formation of PE-lipoxidated proteins and blocked ferroptotic death. Finally, our docking simulations showed that the truncated PE species bound at least as good to several of the lantibiotic-identified proteins, as compared to the non-truncated parent molecule, stearoyl-arachidonoyl PE (SAPE), indicating that these oxidatively-truncated species favor/promote the formation of PEox-protein adducts. The identification of PEox-protein adducts during ferroptosis suggests that they are participants in the ferroptotic process preventable by 2-mercaptoethanol and may contribute to a point of no return in the ferroptotic death process.

Redox phospholipidomics of enzymatically generated oxygenated phospholipids as specific signals of programmed cell death.

High fidelity and effective adaptive changes of the cell and tissue metabolism to changing environments require strict coordination of numerous biological processes. Multicellular organisms developed sophisticated signaling systems of monitoring and responding to these different contexts. Among these systems, oxygenated lipids play a significant role realized via a variety of re-programming mechanisms. Some of them are enacted as a part of pro-survival pathways that eliminate harmful or unnecessary molecules or organelles by a variety of degradation/hydrolytic reactions or specialized autophageal processes. When these "partial" intracellular measures are insufficient, the programs of cells death are triggered with the aim to remove irreparably damaged members of the multicellular community. These regulated cell death mechanisms are believed to heavily rely on signaling by a highly diversified group of molecules, oxygenated phospholipids (PLox). Out of thousands of detectable individual PLox species, redox phospholipidomics deciphered several specific molecules that seem to be diagnostic of specialized death programs. Oxygenated cardiolipins (CLs) and phosphatidylethanolamines (PEs) have been identified as predictive biomarkers of apoptosis and ferroptosis, respectively. This has led to decoding of the enzymatic mechanisms of their formation involving mitochondrial oxidation of CLs by cytochrome c and endoplasmic reticulum-associated oxidation of PE by lipoxygenases. Understanding of the specific biochemical radical-mediated mechanisms of these oxidative reactions opens new avenues for the design and search of highly specific regulators of cell death programs. This review emphasizes the usefulness of such selective lipid peroxidation mechanisms in contrast to the concept of random poorly controlled free radical reactions as instruments of non-specific damage of cells and their membranes. Detailed analysis of two specific examples of phospholipid oxidative signaling in apoptosis and ferroptosis along with their molecular mechanisms and roles in reprogramming has been presented.

Apoptotic interactions of cytochrome c: redox flirting with anionic phospholipids within and outside of mitochondria.

Since the (re)discovery of cytochrome c (cyt c) in the early 1920s and subsequent detailed characterization of its structure and function in mitochondrial electron transport, it took over 70 years to realize that cyt c plays a different, not less universal role in programmed cell death, apoptosis, by interacting with several proteins and forming apoptosomes. Recently, two additional essential functions of cyt c in apoptosis have been discovered that are carried out via its interactions with anionic phospholipids: a mitochondria specific phospholipid, cardiolipin (CL), and plasma membrane phosphatidylserine (PS). Execution of apoptotic program in cells is accompanied by substantial and early mitochondrial production of reactive oxygen species (ROS). Because antioxidant enhancements protect cells against apoptosis, ROS production was viewed not as a meaningless side effect of mitochondrial disintegration but rather playing some - as yet unidentified - role in apoptosis. This conundrum has been resolved by establishing that mitochondria contain a pool of cyt c, which interacts with CL and acts as a CL oxygenase. The oxygenase is activated during apoptosis, utilizes generated ROS and causes selective oxidation of CL. The oxidized CL is required for the release of pro-apoptotic factors from mitochondria into the cytosol. This redox mechanism of cyt c is realized earlier than its other well-recognized functions in the formation of apoptosomes and caspase activation. In the cytosol, released cyt c interacts with another anionic phospholipid, PS, and catalyzes its oxidation in a similar oxygenase reaction. Peroxidized PS facilitates its externalization essential for the recognition and clearance of apoptotic cells by macrophages. Redox catalysis of plasma membrane PS oxidation constitutes an important redox-dependent function of cyt c in apoptosis and phagocytosis. Thus, cyt c acts as an anionic phospholipid specific oxygenase activated and required for the execution of essential stages of apoptosis. This review is focused on newly discovered redox mechanisms of complexes of cyt c with anionic phospholipids and their role in apoptotic pathways in health and disease.

The "pro-apoptotic genies" get out of mitochondria: oxidative lipidomics and redox activity of cytochrome c/cardiolipin complexes.

One of the prominent consequences of the symbiogenic origin of eukaryotic cells is the unique presence of one particular class of phospholipids, cardiolipin (CL), in mitochondria. As the product originated from the evolution of symbiotic bacteria, CL is predominantly confined to the inner mitochondrial membrane in normally functioning cells. Recent findings identified CL and its oxidation products as important participants and signaling molecules in the apoptotic cell death program. Early in apoptosis, massive membrane translocations of CL take place resulting in its appearance in the outer mitochondrial membrane. Consequently, significant amounts of CL become available for the interactions with cyt c, one of the major proteins of the intermembrane space. Binding of CL with cytochrome c (cyt c) yields the cyt c/CL complex that acts as a potent CL-specific peroxidase and generates CL hydroperoxides. In this review, we discuss the catalytic mechanisms of CL oxidation by the peroxidase activity of cyt c as well as the role of oxidized CL (CLox) in the release of pro-apoptotic factors from mitochondria into the cytosol. Potential implications of cyt c/CL peroxidase intracellular complexes in disease conditions (cancer, neurodegeneration) are also considered. The discovery of the new role of cyt c/CL complexes in early mitochondrial apoptosis offers interesting opportunities for new targets in drug discovery programs. Finally, exit of cyt c from damaged and/or dying (apoptotic) cells into extracellular compartments and its accumulation in biofluids is discussed in lieu of the formation of its peroxidase complexes with negatively charged lipids and their significance in the development of systemic oxidative stress in circulation.

Inhibitor of apoptosis protein hILP undergoes caspase-mediated cleavage during T lymphocyte apoptosis.

Several endogenous or viral inhibitors of apoptosis, including Bcl-2, Bcl-xL, FLIP, p35, and CrmA, have been shown to be cleaved by caspases during apoptosis. In this study, we demonstrate that the endogenous inhibitor of apoptosis, hILP/XIAP, is also cleaved in apoptotic T lymphocytes, generating at least one prominent fragment of 29 kDa. This p29 cleaved fragment was detected in Jurkat cells induced to apoptose by anti-Fas antibody, staurosporin, or VP-16. The cleavage of hILP appears to be caspase mediated because the production of the p29 protein was inhibited by the pan-caspase peptide inhibitor, Z-VAD.FMK. In Jurkat cells engineered to overexpress CrmA, cleavage of hILP in response to anti-Fas antibody or staurosporin was inhibited, whereas overexpression of Bcl-2 abrogated the cleavage in response to VP-16. Cleavage of hILP was also observed in cell-free reactions using in vitro translated hILP and recombinant caspase-3 or -7. Moreover, we found that the p29 hILP fragment retained the ability to bind caspase-3 and -7, as shown previously for full-length or BIR-2 hILP. The p29 cleavage product was also detected during T-cell receptor-mediated apoptosis in peripheral blood lymphocytes from normal donors. Furthermore, tumor-associated T lymphocytes purified from ascites of patients with ovarian cancer expressed fragmented hILP, which was not detected in control T cells purified from peripheral blood of normal donors. Our results suggest that the cleavage of hILP represents an important event in apoptosis of T lymphocytes in both normal and pathological in vivo settings.

Degradation of thymopentin by human lymphocytes: evidence for aminopeptidase activity.

Thymopentin (Arg-Lys-Asp-Val-Tyr) was shown to be degraded in vitro by human lymphocytes into two main fragments; the tetrapeptide Lys-Asp-Val-Tyr and the tripeptide Asp-Val-Tyr. Degradation products were identified by HPLC and amino-acid analysis. Analysis of the time-course of degradation revealed a 'stepwise' degradative event beginning at the N-terminal. The degradation of thymopentin after the first 10 min, as well as the formation of the tetrapeptide (5-30 min) were essentially curvilinear. Degradation of the tripeptide, was linear. Upon screening a panel of compounds that inhibit enzymatic activity, bestatin, amastatin and 1,10-phenanthroline were shown to be the most effective. Bestatin and amastatin caused an 85-90% inhibition of thymopentin degrading activity with IC50 values of 7.1 x 10(-6) M and 4.5 x 10(-9) M, respectively. 1,10-Phenanthroline completely inhibited the degradative process with an IC50 of 2 x 10(-4) M. When the tetrapeptide Lys-Asp-Val-Tyr was used as the starting substrate, similar IC50 values were seen for amastatin, bestatin and 1,10-phenanthroline. The importance of divalent metal ions in the degradative event was demonstrated not only by the effect of 1,10-phenanthroline, but also by the ability of Zn2+ and Co2+ to reverse the inhibition of 1,10-phenanthroline (at its IC50) to activities near control values (no inhibitor). These data strongly suggest that an aminopeptidase(s) is responsible for the degradative activity.

Neutral surface aminopeptidase activity of human tumor cell lines.

Seven human tumor cell lines were studied for their neutral surface aminopeptidase (AP) activity. The activity was shown to exist on all cell lines to varying degrees. The neutral AP activity of the cell lines had similar Km values and were affected by the same inhibitors as those reported for AP's of peripheral blood lymphocytes (PBL, Refs. 1 and 2). However, a difference was seen in the Vmax values of the various cell lines. These values were shown to correlate (r = 0.767, P less than 0.05) with cell surface area.

Surface aminopeptidase activity of rat natural killer cells. I. Biochemical and biological properties.

Aminopeptidase (AP) activity on rat natural killer (NK) cells was found to have the following characteristics: (1) the activity was surface associated and not secreted, as determined by extracellular location of product and by the cessation of hydrolysis of substrate upon removal of the cells from the medium. (2) The activity was linear with respect to time and cell number. (3) The enzymatic activity on splenocytes and on the NK leukemia cell line CRNK-16, but not on IL-2 activated NK (A-NK) cells, was sensitive to trypsin treatment. (4) The AP activity on intact cells had a broad pH dependency with optimal activity at slightly alkaline pH but lower activity at acidic pH. (5) There was a preference for neutral substrates and essentially no activity towards acidic substrates. (6) Enzymatic activity was inhibited in the presence of the AP inhibitors bestatin and amastatin, and in the presence of the chelator, 1,10 phenanthroline, indicating the involvement of a metalloprotease. (7) Culture of A-NK cells with bestatin resulted in a decrease in cytotoxicity against YAC-1 and P815 targets. Amastatin treatment caused only a slight decrease in cytotoxicity against YAC-1 targets, but a significant decrease in cytotoxicity against P815 targets. (8) Treatment of A-NK cultures with specific inhibitors of APases caused an increase in expression of CD2 (an increase from 20-80% with bestatin and an increase from 25-35% in the presence of amastatin). These results provide the first evidence for the existence of APases on the surface of NK cells and suggest a role for these enzymes in the regulation of cytotoxic activity and of CD2 surface expression.

A new strategy for tumor antigen discovery based on in vitro priming of naive T cells with dendritic cells.

We describe a method for discovery of new tumor antigens that uses dendritic cells (DCs) as antigen-presenting cells to prime autologous naive CD4+ and CD8+ T cells from healthy donors against tumor proteins and peptides. For the identification of HLA class I-restricted tumor antigens, peptides were extracted from tumor HLA class I molecules, fractionated by reverse phase-high performance liquid chromatography, and loaded onto in vitro-generated DCs to prime naïve CD8+ T cells. Our results show that we were able to prime naive CD8+ T cells in vitro to several peptide fractions and generate specificity for the tumor. Electrospray ionization mass spectrometry was used to confirm that these fractions contained peptides derived from MHC class I molecules, and the primed CD8+ T cells were used to further analyze the immunostimulatory peptide fractions. For the identification of HLA class II-restricted tumor antigens, we fractionated tumor protein extracts using reverse phase-high performance liquid chromatography and loaded individual fractions onto DCs to prime naive CD4+ T cells. Our results show that we were also able to prime naive CD4+ T cells to several protein fractions and generate specificity for the tumor. These results illustrate the potential of this method to identify new immunostimulatory MHC class I- and class II-restricted tumor antigens.

Paclitaxel-induced apoptosis in non-small cell lung cancer cell lines is associated with increased caspase-3 activity.

OBJECTIVE: Our objective was to determine whether paclitaxel-induced apoptosis in human lung cancer cells is Fas dependent. METHODS: Human lung cancer cell lines were evaluated for morphologic evidence of apoptosis, DNA fragmentation (TUNEL positivity), and caspase-3 activation after paclitaxel treatment. Human lung adenocarcinoma, squamous cell carcinoma, undifferentiated lung carcinoma, and bronchoalveolar carcinoma cell lines were each cultured in 10 micromol/L paclitaxel. RESULTS: After 24 hours of culture in paclitaxel, a 22% to 69% increase in the number of apoptotic cells was evident by means of methylene blue-azure A-eosin staining with characteristic blebbing and nuclear condensation. TUNEL assay also confirmed an increase of 19.9% to 73.0% of cells with nuclear fragmentation. Caspase-3 activity, assayed by Z-DEVD cleavage, increased from 20% to 215% (P <.05). ZB4, an antagonistic anti-Fas antibody, did not block paclitaxel induction of caspase-3 activity (155.8 vs 165.8 U, not significant). Apoptotic morphologic changes were inhibited in cells cultured in the presence of paclitaxel and Ac-DEVD-CHO, a caspase-3 inhibitor. CONCLUSIONS: Paclitaxel induces apoptosis in lung cancer cell lines, as assessed by a consistent increase in caspase-3 activity, DNA laddering, and characteristic morphologic changes. Paclitaxel-induced apoptosis in human lung cancer cells is associated with caspase-3 activation but is not Fas dependent.

Synthesis and biological activity of [L-3,4-dehydroproline3]-tuftsin.

A 3,4-dehydroproline analogue of tuftsin (L-Thr-L-Lys-L-Pro-L-Arg) was prepared by the solid phase synthetic method. Following reversed-phase high performance liquid chromatography (HPLC) purification, the analogue was compared to tuftsin for its ability to to enhance the chemotactic, bactericidal and phagocytic activities of polymorphonuclear leukocytes (PMN). Both tuftsin and [delta 3-pro3]- tuftsin elicited a similar significant chemotactic effect at a concentration of 10 micrograms/ml. A slight suppression of the chemotactic activity was observed with tuftsin at 10(-3) micrograms/ml and with [delta 3-pro3]-tuftsin at concentrations of 10(-3), 10(-2) (significant) and 10-1 micrograms/ml. Although similar bactericidal activities were observed for both peptides, PMN exposed to [delta 3-pro 3]-tuftsin exhibited increased phagocytic indicies 2-4 times that of tuftsin-treated PMN at concentrations of 0.4, 0.6 and 1.0 microgram/ml.

Production by human squamous cell carcinoma of a factor inducing activation and proliferation of immune cells.

OBJECTIVE: To examine supernatants (SNs) of human squamous cell carcinoma of the head and neck cell lines for soluble tumor-derived factors capable of inducing activation and proliferation of human immune cells. DESIGN: The SN of squamous cell carcinoma of the head and neck cell line PCI-50 was cultured in serum-free medium and tested for the ability to induce expression of activation antigens, proliferation, cytotoxicity against tumor cell targets and cytokine production by purified human natural killer (NK) and CD4+ T cells. RESULTS: Supernatant of PCI-50 promoted expression of the following activation markers on NK and T cells: CD25 (interleukin-2R-alpha), HLA-DR (major histocompatibility complex class II), CD54 (ICAM-1), CD71 (transferrin receptor), and CD69 (activation-inducing molecule). In addition, SN induced and significantly sustained (P < .01) proliferation of human unseparated peripheral blood lymphocytes and NK or T cells in culture. Purified human NK or T cells cultured in the presence of the SN and IL-2 (120 IU/mL) had significantly higher antitumor cytotoxicity than that mediated by NK or T cells cultured in AIM-V medium and IL-2. The SN induced cytokine (interferon gamma, tumor necrosis factor alpha, interleukin-6) production in purified NK or T cells. When the SN was fractionated by molecular weight-based filtration into fractions greater and less than 30 kd, the growth- and cytotoxicity-promoting activities were consistently detectable in the greater than 30-kd fraction. CONCLUSIONS: Culture SN of squamous cell carcinoma of the head and neck cell lines contain a soluble factor(s) capable of activating NK and CD4+ T cells and of promoting growth and antitumor cytotoxicity of these lymphocyte subsets in vitro.

HMGB1 release and redox regulates autophagy and apoptosis in cancer cells.

The functional relationship and cross-regulation between autophagy and apoptosis is complex. In this study we show that the high-mobility group box 1 protein (HMGB1) is a redox-sensitive regulator of the balance between autophagy and apoptosis. In cancer cells, anticancer agents enhanced autophagy and apoptosis, as well as HMGB1 release. HMGB1 release may be a prosurvival signal for residual cells after various cytotoxic cancer treatments. Diminished HMGB1 by short hairpin RNA transfection or inhibition of HMGB1 release by ethyl pyruvate or other small molecules led predominantly to apoptosis and decreased autophagy in stressed cancer cells. In this setting, reducible HMGB1 binds to the receptor for advanced glycation end products (RAGEs), but not to Toll-like receptor 4, induces Beclin1-dependent autophagy and promotes tumor resistance to alkylators (melphalan), tubulin disrupting agents (paclitaxel), DNA crosslinkers (ultraviolet light) and DNA intercalators (oxaliplatin or adriamycin). On the contrary, oxidized HMGB1 increases the cytotoxicity of these agents and induces apoptosis mediated by the caspase-9/-3 intrinsic pathway. HMGB1 release, as well as its redox state, thus links autophagy and apoptosis, representing a suitable target when coupled with conventional tumor treatments.