WO2005072295A2 - Methods for reducing oxidative damage - Google Patents
Methods for reducing oxidative damage Download PDFInfo
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- WO2005072295A2 WO2005072295A2 PCT/US2005/002119 US2005002119W WO2005072295A2 WO 2005072295 A2 WO2005072295 A2 WO 2005072295A2 US 2005002119 W US2005002119 W US 2005002119W WO 2005072295 A2 WO2005072295 A2 WO 2005072295A2
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Definitions
- Mitochondria are essential to cell survival as the main producers of ATP via oxidative phosphorylation.
- the mitochondria respiratory chain is also a major source of oxidative free radicals.
- radical production can occur as a result of the reaction of mitochondrial electron carriers, such as ubiquinol, with oxygen to form a superoxide.
- Superoxides react by dismutation to hydrogen peroxide, which can decompose to hydroxyl radical.
- superoxides react with nitric oxide to form peroxynitrite and other reactive oxidants.
- Free radicals including ROS, and reactive nitrogen species (RNS) produce diverse non-specific damage to biological molecules, including lipids, proteins, RNA and DNA. Such damage of these molecules has been implicated in numerous clinical disorders, such as atherosclerosis, preeclampsia, Alzheimer's disease, Parkinson's disease and arthritis.
- Antioxidant therapy can potentially delay the aging process, and be beneficial in a host of human diseases and conditions, such as those described above.
- the development of specific mitochondrial therapies has been hampered by the difficulty of delivering antioxidant molecules to mitochondria in vivo. For example, the molecule must first be taken up across the plasma membrane into the cytoplasm, and then targeted selectively to mitochondria.
- the present invention provides a method for reducing oxidative damage in a mammal in need thereof.
- the method comprises administering to the mammal an effective amount of an aromatic cationic peptide.
- the aromatic cationic peptide have (a) at least one net positive charge; (b) a minimum of three amino acids; (c) a maximum of about twenty amino acids; (d) a relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) wherein 3p m is the largest number that is less than or equal to r+1 ; (e) a relationship between the minimum number of aromatic groups (a) and the total number of net positive charges (p t ) wherein 3a is the largest number that is less than or equal to p t +1 , except that when a is 1 , p t may also be 1 ; and (f) at least one tyrosine or tryptophan amino acid.
- the invention also provides a method of reducing oxidative damage in a removed organ of a mammal.
- the method comprises administering to the removed organ an effective amount of an aromatic-cationic peptide.
- the aromatic-cationic peptide have (a) at least one net positive charge; (b) a minimum of four amino acids; (c) a maximum of about twenty amino acids; (d) a relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) wherein 3p m is the largest number that is less than or equal to r + 1; (e) a relationship between the minimum number of aromatic groups (a) and the total number of net positive charges (p t ) wherein 2a is the largest number that is less than or equal to p t + ⁇ 1, except that when a is 1, pt may also be 1; and (f) at least one tyrosine or tryptophan amino acid.
- the invention provides a method of reducing oxidative damage in a mammal in need thereof.
- the method comprises administering to the mammal an effective amount of an aromatic-cationic peptide.
- the aromatic-cationic peptide have (a) at least one net positive charge; (b) a minimum of three amino acids; (c) a maximum of about twenty amino acids; (d) a relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) wherein 3p m is the largest number that is less than or equal to r + 1; (e) a relationship between the minimum number of aromatic groups (a) and the total number of " net positive charges (p t ) wherein 2a is the largest number that is less than or equal to p t + 1, except that when a is 1, pt may also be ,1, and (f) at least one tyrosine or tryptophan amino acid.
- the invention provides a method of reducing oxidative damage in a removed organ of a mammal.
- the method comprises administering to the removed organ an effective amount of an aromatic-cationic peptide.
- the aromatic cationic peptide have (a) at least one net positive charge; (b) a minimum of three amino acids; (c) a maximum of about twenty amino acids; (d) a relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) wherein 3p m is the largest number that is less than or equal to r + 1; (e) a relationship between the minimum number of aromatic groups (a) and the total number of net positive charges (p t ) wherein 3a is the largest number that is less than or equal to p t + 1, except that when a is 1, p t may also be 1, and (f) at least one tyrosine or tryptophan amino acid.
- the invention provides a method of reducing oxidative damage in a cell in need thereof.
- the aromatic cationic peptide have (a) at least one net positive charge; (b) a minimum of three amino acids; (c) a maximum of about twenty amino acids; (d) a relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) wherein 3p ra is the largest number that is less than or equal to r + 1 ; (e) a relationship between the minimum number of aromatic groups (a) and the total number of net positive charges (p t ) wherein 3a is the largest number that is less than or equal to p t + 1, except that when a is 1, p t may also be 1, and (f) at least one tyrosine or tryptophan amino acid.
- the invention provides a method of reducing oxidative damage in a cell in need thereof.
- the aromatic cationic peptide have (a) at least one net positive charge; (b) a minimum of three amino acids; (c) a maximum of about twenty amino acids; (d) a relationship between the mimmum number of net positive charges (p m ) and the total number of amino acid residues (r) wherein 3p m is the largest number that is less than or equal to r + 1; (e) a relationship between the minimum number of aromatic groups (a) and the total number of net positive charges (p t ) wherein 2a is the largest number that is less than or equal to p t + 1, except that when a is 1, p t may also be 1, and (f) at least one tyrosine or tryptophan amino acid
- Figure 1 (A) SS-02 and (B) SS-05 dose-dependently scavenge H 2 O 2 .
- Figure 2 (A) SS-02 dose-dependently inhibits linoleic acid peroxidation induced by ABAP and (B) SS-02, SS-05, SS-29, SS-30, SS-31, SS-32 and Dmt reduced the rate of linoleic acid peroxidation induced by ABAP.
- Figure 3 (A) SS-02 dose-dependently inhibits LDL oxidation induced by 10 mM CuSO 4 and (B) SS-02, SS-05, SS-29, SS-30, SS-31, SS-32 and Dmt reduced rate of LDL oxidation.
- FIG. 1 (A) SS-02 inhibits mitochondrial production of hydrogen peroxide as measured by luminol chemiluminescence under basal conditions and upon stimulation by antimycin. (B) SS-02, SS-29, SS-30 and SS-31 reduced spontaneous generation of hydrogen peroxide generated by isolated mitochondria.
- FIG. 1 (A) SS-31 inhibits spontaneous production of hydrogen hydroperoxide by isolated mitochondria and (B) SS-31 inhibits hydrogen peroxide production stimulated by antimycin. [0020] Figure 6. SS-31 dose-dependently decreased intracellular ROS (reactive oxygen species) (A_) and increased cell survival (B) in N 2 A cells exposed to a high dose of the pro-oxidant t-butyl hydroperoxide (t-BHP; 0.5 mM), (C) SS-02 also dose-dependently increased cell survival when Nf2A cells were exposed to 1 mM t-BHP.
- ROS reactive oxygen species
- t-BHP pro-oxidant t-butyl hydroperoxide
- Figure 7 SS-31 dose-dependently prevented loss of cell viability caused by low doses of t-BHP (0.05 - 0.1 mM) in neuronal (A) SH-SY5Y and (B) N 2 A cells.
- Figure 8 SS-31 dose-dependently decreased the percent of cells showing increased caspase activity after treatment with a low dose of t-BHP for 12 h in N 2 A cells.
- Figure 10 SS-31 inhibited lipid peroxidation caused by exposure of N 2 A cells to 1 mM t-BHP for 1 h.
- A untreated cells;
- B cells treated with 1 mM t-BHP for 3 h;
- C cells treated with 1 mM if-BHP and 10 nM SS-31 for 3 h.
- Apoptosis was evaluated by confocal microscopy with the fluorescent probe Hoechst 33342.
- Al a representative field of cells not treated with t-BHP.
- A2 Fluorescent image showing a few cells with dense, fragmented chromatin indicative of apoptotic nuclei.
- BI A representative field of cells treated with 0.025 mM t-BHP for 24 h.
- B2 Fluorescent image showing an increased number of cells with apoptotic nuclei.
- CI A representative field of cells treated with 0.025 mM t-BHP and 1 nM SS-31 for 24 h.
- C2 Fluorescent image showing a reduced number of cells with apoptotic nuclei.
- D SS-31 dose-dependently reduced the percent of apoptotic cells caused by 24 h treatment with a low dose of t-BHP (0.05 mM).
- FIG. 13 A SS-02 and SS-31 reduced lipid peroxidation in isolated guinea pig hearts subjected to " warm reperfusion after a brief period of ischemia.
- Tissue slices were incubated with anti-HNE antibody, (e) Background control: staining without primary antibody.
- FIG. 13B SS-02 and SS-31 reduced lipid peroxidation in isolated guinea pig hearts subjected to warm reperfusion after a brief period of ischemia.
- Tissue slices were incubated with anti-HNE antibody, (e) Background control: staining without primary antibody.
- FIG. 14A SS-31 significantly improved coronary flow in isolated guinea pig hearts subjected to warm reperfusion after prolonged (18h) cold ischemia.
- the shaded area represents 18 h of ischemia at 4°C.
- FIG. 14B Guinea pig hearts perfused with a cardioplegic solution (St.
- FIG. 14C SS-31 prevents apoptosis in endothelial cells and myocytes in isolated guinea pig hearts subjected to warm reperfusion after prolonged (18 h) cold ischemia.
- the hearts were then reperfused with buffer at 34°C for 90 min.
- Apoptosis was assessed by the TUNEL stain (green) and nuclei are visualized by DAPI (blue).
- Figure 15 A SS-31 improves survival of islet cells isolated from mouse pancreas as measured by mitochondrial potential. SS-31 (1 nM) was added to all isolation buffers used throughout the isolation procedure. Mitochondrial potential was measured using TMRM (red) with confocal microscopy.
- Figure 15B SS-31 reduces apoptosis and increases viability in islet cells isolated from mouse pancreas as measured by flow cytometry. SS-31 (1 nM) was added to all isolation buffers used throughout the isolation procedure. Apoptosis was ascertained using annexin N and necrosis by propidium iodide (PI).
- PI propidium iodide
- FIG. 16 SS-31 reduces oxidative damage in pancreatic islet cells caused by t-butylhydroperoxide (tBHP).
- Mouse pancreatic islet cells were untreated (a), or treated with 25 ⁇ M tBHP without (b) or with 1 nM SS-31 (c).
- Mitochondrial potential was measured by TMRM (red) and reactive oxygen species were measured by DCF (green) using confocal microscopy.
- FIG. 17A SS-31 protects dopamine cells against MPP + toxicity.
- S ⁇ -4741 cells were treated with buffer, 50 ⁇ M MPP + or 50 ⁇ M MPP + and 1 nM SS-31, for 48 h, and the incidence of apoptosis was determined by fluorescent microscopy with Hoechst 33342. The number of condensed fragmented nuclei was significantly increased by MPP + treatment. Concurrent treatment with SS-31 reduced the number of apoptotic cells.
- FIG. 17C SS-31 dose-dependently increased striatal dopamine, DOPAC (3,4- dihydroxyphenylacetic acid) and HVA (homovanillic acid) levels in mice treated with MPTP.
- Three doses of MPTP (10 mg/kg) was given to mice (n 12) 2 h apart.
- the invention is based on the surprising discovery by the inventors that certain aromatic-cationic peptides reduce oxidative damage. Reducing oxidative damage is important since free radicals, such as ROS and RNS, produce diverse non-specific damage to lipids, proteins, RNA and DNA. Oxidative damage caused by free radicals is associated with several diseases and conditions in mammals.
- the aromatic-cationic peptides useful in the present invention are water-soluble and highly polar. Despite these properties, the peptides can readily penetrate cell membranes.
- aromatic-cationic peptides useful in the present invention include a minimum of three amino acids, and preferably include a minimum of four amino acids, covalently joined by peptide bonds.
- the maximum number of amino acids present in the aromatic-cationic peptides of the present invention is about twenty amino acids covalently joined by peptide bonds.
- the maximum number of amino acids is about twelve, more preferably about nine, and most preferably about six.
- the number of amino acids present in the peptides is four.
- the arnirio acids of the aromatic-cationic peptides useful in the present invention can be any amino acid.
- amino acid is used to refer to any organic molecule that contains at least one amino group and at least one carboxyl group. Preferably, at least one amino group is at the ⁇ position relative to the carboxyl group.
- the amino acids may be naturally occurring.
- Naturally occurring amino acids include, for example, the twenty most common levorotatory (L) amino acids normally found in mammalian proteins, i.e., alanine (Ala), arginine (Arg), asparagine (Asn), aspartic acid (Asp), cysteine (Cys), glutamine (Glu), glutamic acid (Glu), glycine (Gly), histidine (His), isoleucine (lieu), leucine (Leu), lysine (Lys), methionine (Met), phenylalanine (Phe), proline (Pro), serine (Ser), threonine (Thr), tryptophan, (Trp), tyrosine (Tyr), and valine (Val).
- Naturally occurring amino acids include, for example, amino acids that are synthesized in metabolic processes not associated with protein synthesis.
- the amino acids ornithine and citrulline are synthesized in mammalian metabolism during the production of urea.
- the peptides useful in the present invention can contain one or more non-naturally occurring amino acids.
- the non-naturally occurring amino acids may be L-, dextrorotatory (D), or mixtures thereof.
- the peptide has no amino acids that are naturally occurring.
- Non-naturally occurring amino acids are those amino acids that typically are not synthesized in normal metabolic processes in living organisms, and do not naturally occur in proteins.
- the non-naturally occurring amino acids useful in the present invention preferably are also not recognized by common proteases.
- the non-naturally occurring amino acid can be present at any position in the peptide.
- the non-naturally occurring amino acid can be at the N-terminus, the C- terminus, or at any position between the N-terminus and the C-terminus.
- the non-natural amino acids may, for example, comprise alkyl, aryl, or alkylaryl groups.
- alkyl amino acids include ⁇ -aminobutyric acid, ⁇ -aminobutyric acid, ⁇ -aminobutyric acid, ⁇ -aminovaleric acid, and ⁇ -aminocaproic acid.
- aryl amino acids include ortho-, meta, and para-aminobenzoic acid.
- alkylaryl amino acids include ortho-, meta-, and para-aminophenylacetic acid, and ⁇ -phenyl- ⁇ - aminobutyric acid.
- Non-naturally occurring amino acids also include derivatives of naturally occurring amino acids.
- the derivatives of naturally occurring amino acids may, for example, include the addition of one or more chemical groups to the naturally occurring amino acid.
- one or more chemical groups can be added to one or more of the 2',
- the group can be any chemical group that can be added to an aromatic ring.
- Some examples of such groups include branched or unbranched C ⁇ -C 4 alkyl, such as methyl, ethyl, n-propyl, isopropyl, butyl, isobutyl, or t-butyl, C ⁇ -C 4 alkyloxy (i.e., alkoxy), amino, C ⁇ -C 4 alkylamino and C ⁇ -C 4 dialkylamino (e.g., methylamino, dimethylamino), nitro, hydroxyl, halo (i.e., fluoro, chloro, bromo, or iodo).
- Some specific examples of non-naturally occurring derivatives of naturally occurring amino acids include norvaline (Nva), norleucine CNle), and hydroxyproline (Hyp).
- Another example of a modification of an amino acid in a peptide useful in the methods of the present invention is the derivatization of a carboxyl group of an aspartic acid or a glutamic acid residue of the peptide.
- derivatization is amidation with ammonia or with a primary or secondary amine, e.g. methylamine, ethylamine, dimethylamine or diethylamine.
- Another example of derivatization includes esterification with, for example, methyl or ethyl alcohol.
- Another such modification includes derivatization of an amino group of a lysine, arginine, or histidine residue.
- amino groups can be acylated.
- suitable acyl groups include, for example, a benzoyl group or an alkanoyl group comprising any of the C 1 -C 4 alkyl groups mentioned above, such as an acetyl or propionyl group.
- the non-naturally occurring amino acids are preferably resistant, and more preferably insensitive, to common proteases.
- non-naturally occurring amino acids that are resistant or insensitive to proteases include the dextrorotatory (D-) form of any of the above-mentioned naturally occurring L-amino acids, as well as L- and/or D- non-naturally occurring amino acids.
- the D-amino acids do not normally occur in proteins, although they are found in certain peptide antibiotics that are synthesized by means other than the normal ribosomal protein synthetic machinery of the cell. As used herein, the D-amino acids are considered to be non-naturally occurring amino acids.
- the peptides useful in the methods of the invention should have less than five, preferably less than four, more preferably less than three, and most preferably, less than two contiguous L-amino acids recognized by common proteases, irrespective of whether the amino acids are naturally or non-naturally occurring.
- the peptide has only D-amino acids, and no L-amino acids.
- the peptide contains protease sensitive sequences of amino acids, at least one of the amino acids is preferably a non-naturally-occurring D-amino acid, thereby conferring protease resistance.
- An example of a protease sensitive sequence includes two or more contiguous basic amino acids that are readily cleaved by common proteases, such as endopeptidases and trypsin. Examples of basic amino acids include arginine, lysine and histidine.
- At least one of the amino acids present in the aromatic-cationic peptide is a tyrosine or tryptophan residue, or a derivative thereof.
- the aromatic-cationic peptides have a minimum number of net positive charges at physiological pH in comparison to the total number of amino acid residues in the peptide.
- the minimum number of net positive charges at physiological pH will be referred to below as (p m ).
- the total number of amino acid residues in the peptide will be referred to below as (r).
- physiological pH refers to the normal pH in the cells of the tissues and organs of the mammalian body.
- physiological pH refers to the normal pH in the cells of the tissues and organs of the mammalian body.
- physiological pH of a human is normally approximately 7.4, but normal physiological pH in mammals may be any pH from about 7.0 to about 7.8.
- Net charge refers to the balance of the number of positive charges and the number of negative charges carried by the amino acids present in the peptide. In this specification, it is understood that net charges are measured at physiological pH.
- the naturally occurring amino acids that are positively charged at physiological pH include L-lysine, L-arginine, and L-histidine.
- the naturally occurring amino acids that are negatively charged at physiological pH include L-aspartic acid and L-glutamic acid.
- a peptide has a positively charged N-terminal amino group and a negatively charged C-terminal carboxyl group. The charges cancel each other out at physiological pH.
- the peptide Tyr-Arg-Phe-Lys-Glu- His-Trp-Arg has one negatively charged amino acid (i.e., Glu) and four positively charged amino acids (i.e., two Arg residues, one Lys, and one His). Therefore, the above peptide has a net positive charge of three.
- the aromatic-cationic peptides have a relationship between the minimum number of * net positive charges at physiological pH (p m ) and the total number of amino acid residues (r) wherein 3p m is the largest number that is less than or equal to r + 1.
- the relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) is as follows:
- the aromatic-cationic peptides have a relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) wherein 2p m is the largest number that is less than or equal to r + 1.
- the relationship between the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) is as follows:
- the minimum number of net positive charges (p m ) and the total number of amino acid residues (r) are equal.
- the peptides have three or four amino acid residues and a minimum of one net positive charge, preferably, a minimum of two net positive charges and more preferably a minimum of three net positive charges.
- aromatic-cationic peptides have a minimum number of aromatic groups in comparison to the total number of net positive charges (p t ).
- the minimum number of aromatic groups will be referred to " below as (a).
- Naturally occurring amino acids that have an aromatic group include the amino acids histidine, tryptophan, tyrosine, and phenylalanine.
- the hexapeptide Lys-Gln- Tyr-Arg-Phe-Trp has a net positive charge of two (contributed by the lysine and arginine residues) and three aromatic groups (contributed by tyrosine, phenylalanine and tryptophan residues).
- the aromatic-cationic peptides useful in the methods of the present invention have a relationship between the minimum number of aromatic groups (a) and the total number of net positive charges at physiological pH (p t ) wherein 3 a is the largest number that is less than or equal to p t + 1, except that when p t is 1, a may also be 1.
- the relationship between the minimum number of aromatic groups (a) and the total number of net positive charges (p t ) is as follows:
- the aromatic-cationic peptides have a relationship between the minimum number of aromatic groups (a) and the total number of net positive charges (p t ) wherein 2a is the largest number that is less than or equal to pt + 1.
- the relationship between the minimum number of aromatic amino acid residues (a) and the total number of net positive charges (p t ) is as follows:
- the number of aromatic groups (a) and the total number of net positive charges (pt) are equal.
- Carboxyl groups are preferably amidated with, for example, ammonia to form the C-terminal amide.
- the terminal carboxyl group of the C-terminal amino acid may be amidated with any primary or secondary a ine.
- the primary or secondary amine may, for example, be an alkyl, especially a branched or unbranched C 1 -C 4 alkyl, or an aryl amine.
- amino acid at the C-terminus of the peptide may be converted to an amido, N-methylamido, N- ethylamido, N,N-dimethylamido, N,N-diethylamido, N-methyl-N-ethylamido, N-phenylamido or N-phenyl-N-ethylamido group.
- the free carboxylate groups of the asparagine, glutamine, aspartic acid, and glutamic acid residues not occurring at the C-terminus of the aromatic-cationic peptides of the present invention may also be amidated wherever they occur within the peptide.
- the amidation at these internal positions may be with ammonia or any of the primary or secondary amines described above.
- the aromatic-cationic peptide useful in the methods of the present invention is a tripeptide having two net positive charges and at least one aromatic amino acid.
- the aromatic-cationic peptide useful in the methods of the present invention is a tripeptide having two net positive charges and two aromatic amino acids.
- Aromatic-cationic peptides useful in the methods of the present invention include, but are not limited to, the following peptide examples:
- Trp-D-Lys-Tyr-Arg-NH 2 Trp-D-Lys-Tyr-Arg-NH 2
- the peptides useful in the methods of the present invention have mu-opioid receptor agonist activity (i.e., activate the mu-opioid receptor). Activation of the mu-opioid receptor typically elicits an analgesic effect.
- an aromatic-cationic peptide having mu-opioid receptor activity is preferred.
- an aromatic-cationic peptide that activates the mu-opioid receptor For example, the acute diseases and conditions can be associated with moderate or severe pain.
- the analgesic effect of the aromatic-cationic peptide may be beneficial in the treatment regimen of the patient or other mammal, although an aromatic- cationic peptide which does not activate the mu-opioid receptor may also be used with or without an analgesic according to clinical requirements.
- an aromatic-cationic peptide that does not have mu-opioid receptor activity is prefened.
- the use of an aromatic-cationic peptide that activates the mu- opioid receptor may be contraindicated.
- the potentially adverse or addictive effects of the aromatic-cationic peptide may preclude the use of an aromatic-catiomc peptide that activates the mu-opioid receptor in the treatment regimen of a human patient or other mammal.
- Potential adverse effects may include sedation, constipation, nervous system depression and respiratory depression.
- an aromatic-cationic peptide that does not activate the mu-opioid receptor may be an appropriate treatment.
- Examples of acute conditions include heart attack, stroke and traumatic injury.
- Traumatic injury may include traumatic brain and spinal cord injury.
- Examples of chronic diseases or conditions include coronary artery disease and any neurodegenerative disorders, such as those described below.
- Peptides useful in the methods of the present invention which have mu-opioid receptor activity are typically those peptides which have a tyrosine residue or a tyrosine derivative at the N-terminus (i.e., the first amino acid position).
- Preferred derivatives of tyrosine include 2'-methyltyrosine (Mmt); 2',6'-dimethyltyrosine (2'6'Dmt); 3',5'-dimethyltyrosine (3'5'Dmt); N,2',6'-trimethyltyrosine (Tmt); and 2'-hydroxy-6'-methyltryosine (Hmt).
- a peptide that has mu-opioid receptor activity has the formula Tyr-D-Arg-Phe-Lys-NH 2 (for convenience represented by the acronym: DALDA, which is referred to herein as SS-01).
- DALDA has a net positive charge of three, contributed by the amino acids tyrosine, arginine, and lysine and has two aromatic groups contributed by the amino acids phenylalanine and tyrosine.
- the tyrosine of DALDA can be a modified derivative of tyrosine such as in 2',6'-dimethyltyrosine to produce the compound having the formula 2',6'-Dmt-D-Arg-Phe-Lys-NH 2 (i.e., Dmt 1 -DALDA, which is referred to herein as SS-02).
- Peptides that do not have mu-opioid receptor activity generally do not have a tyrosine residue or a derivative of tyrosine at the N-terminus (i.e., amino acid position one).
- the amino acid at the N-terminus can be any naturally occurring or non-naturally occurring amino acid other than tyrosine.
- the amino acid at the N-terminus is phenylalanine or its derivative.
- phenylalanine Prefened derivatives of phenylalanine include 2'-methylphenylalanine (Mmp), 2',6'- dimethylphenylalanine (Dmp), N,2',6'-trimethylphenylalanine (Tmp), and 2'-hydroxy-6'- methylphenylalanine (Hmp).
- the amino acid residue at the N- terminus is arginine.
- An example of such a peptide is D-Arg-2'6'Dmt-Lys-Phe-NH 2 (refereed to in this specification as SS-31).
- Another aromatic-cationic peptide that does not have mu-opioid receptor activity has the formula Phe-D-Arg-Dmt-Lys-NH .
- the N-terminal phenylalanine can be a derivative of phenylalanine such as 2',6'-dimethylphenylalanine (2'6'Dmp).
- DALDA containing 2',6'-dimethylphenylalanine at amino acid position one has the formula 2',6'-Dmp-D- Arg-Dmt-Lys-NH 2 .
- the amino acid sequence of Dm ⁇ -DALDA (SS-02) is rearranged such that Dmt is not at the N-terminus.
- An example of such an aromatic-cationic peptide that does not have mu-opioid receptor activity has the formula D-Arg-2'6'Dmt-Lys-Phe- NH 2 (SS-31).
- DALDA, SS-31, and their derivatives can further include functional analogs.
- a peptide is considered a functional analog of DALDA or S S-31 if the analog has the same function as DALDA or SS-31.
- the analog may, for example, be a substitution variant of DALDA or SS-31, wherein one or more amino acid is substituted by another amino acid.
- Suitable substitution variants of DALDA or SS-31 include conservative amino acid substitutions.
- Amino acids may be grouped according to their physicochemical characteristics as follows:
- Non-polar amino acids Ala(A) Ser(S) Thr(T) Pro(P) Gly(G);
- Acidic amino acids Asn(N) Asp(D) Glu(E) Gln(Q);
- Basic amino acids His(H) Arg(R) Lys(K);
- Hydrophobic amino acids Met(M) Leu(L) Ile(I) Nal(V); and
- Aromatic amino acids Phe(F) Tyr(Y) Trp(W) His (H).
- substitutions of an amino acid in a peptide by another amino acid in the same group is refened to as a conservative substitution and may preserve the physicochemical characteristics of the original peptide.
- substitutions of an amino acid in a peptide by another amino acid in a different group is generally more likely to alter the characteristics of the original peptide.
- Examples of analogs useful in the practice of the present invention that activate mu-opioid receptors include, but are not limited to, the aromatic-cationic peptides shown in Table 1.
- Dab diaminobutyric acid
- Dap diaminopropionic acid
- Dmt dimethyltyrosine
- Mmt 2'-methyltyrosine
- Tmt N, 2 l ,6'-trimethyltyrosine
- Hmt 2'-hydroxy,6'-methyltyrosine
- Bio biotin [0089]
- Examples of analogs useful in the practice of the present invention that do not activate mu-opioid receptors include, but are not limited to, the aromatic-cationic peptides shown in Table 2.
- amino acids of the peptides shown in table 1 and 2 may be in either the L- or the D- configuration.
- the peptides described above are useful in reducing oxidative damage in a mammal in need thereof.
- Mammals in need of reducing oxidative damage are those mammals suffering from a disease, condition or treatment associated with oxidative damage.
- the oxidative damage is caused by free radicals, such as reactive oxygen species (RO S) and/or reactive nitrogen species (RNS).
- ROS and RNS include hydroxyl radical (HO»), superoxide anion radical (O 2 » ⁇ ), nitric oxide (NO»), hydrogen peroxide (H 2 O 2 ), hypochlorous acid (HOC1) and peroxynitrite anion (ONOO " ).
- a mammal in need thereof may be a mammal undergoing a treatment associated with oxidative damage.
- the mammal may be undergoing reperfusion.
- Reperfusion refers to the restoration of blood flow to any organ or tissue in which the flow of blood is decreased or blocked.
- the restoration of blood flow during reperfusion leads to respiratory burst and formation of free radicals.
- Decreased or blocked blood flow may be due to hypoxia or ischemia.
- the loss or severe reduction in blood supply during hypoxia or ischemia may, for example, be due to thromboembolic stroke, coronary atherosclerosis, or peripheral vascular disease.
- ischemia or hypoxia Numerous organs and tissues are subject to ischemia or hypoxia. Examples of such organs include brain, heart, kidney, intestine and prostate.
- the tissue affected is typically muscle, such as cardiac, skeletal, or smooth muscle.
- cardiac muscle ischemia or hypoxia is commonly caused by atherosclerotic or thrombotic blockages which lead to the reduction or loss of oxygen delivery to the cardiac tissues by the cardiac arterial and capillary blood supply.
- cardiac ischemia or hypoxia may cause pain and necrosis of the affected cardiac muscle, and ultimately may lead to cardiac failure.
- Ischemia or hypoxia in skeletal muscle or smooth muscle may arise from similar causes.
- ischemia or hypoxia in intestinal smooth muscle or skeletal muscle of the limbs may also be caused by atherosclerotic or thrombotic blockages.
- the restoration of blood flow can occur by any method known to those in the art.
- reperfusion of ischemic cardiac tissues may arise from angioplasty, coronary artery bypass graft, or the use of thrombolytic drugs.
- Reducing oxidative damage associated with ischemia hypoxia and reperfusion is important because the tissue damage associated with ischemia/hypoxia and reperfusion is associated with, for example, myocardial infarction, stroke and hemonhagic shock.
- a mammal in need thereof can be a mammal with a disease or condition associated with oxidative damage.
- the oxidative damage can occur in any cell, tissue or organ of the mammal.
- cells, tissues or organs include, but are not limited to, endothelial cells, epithelial cells, nervous system cells, skin, heart, lung, kidney and liver.
- lipid peroxidation and an inflammatory process are associated with oxidative damage for a disease or condition.
- Lipid peroxidation refers to oxidative modification of lipids.
- the lipids can be present in the membrane of a cell. This modification of membrane lipids typically results in change and/or damage to the membrane function of a cell.
- lipid peroxidation can also occur in lipids or lipoproteins exogenous of a cell. For example, low-density lipoproteins are susceptible to lipid peroxidation.
- An example of a condition associated with lipid peroxidation is atherosclerosis. Reducing oxidative damage associated with atherosclerosis is important since atherosclerosis is implicated in, for example, heart attacks and coronary artery- disease.
- Inflammatory process refers to the activation of the immune system.
- the immune system is activated by an antigenic substance.
- the antigenic substance can be any substance recognized by the immune system, and include self-derived particles and foreign- derived particles. Examples of diseases or conditions occuning from an inflammatory process to self-derived particles include arthritis and multiple sclerosis. Examples of foreign particles include viruses and bacteria.
- the virus can be any virus which activates an inflammatory process, and associated with oxidative damage.
- viruses include, hepatitis A, B or C virus, human immunodeficiency virus, influenza virus, and bovine diarrhea virus.
- hepatitis virus can elicit an inflammatory process and formation of free radicals, thereby damaging the liver.
- the bacteria can be any bacteria, and include gram-negative or gram-positive bacteria.
- Gram-negative bacteria contain lipopolysaccharide in the bacteria wall. Examples of gram-negative bacteria include Escherichia coli, Klebsiella pneumoniae, Proteus species, Pseudomonas aeruginosa, Serratia, and Bacteroides. Examples of gram-positive bacteria include pneumococci and streptococci.
- An example of an inflammatory process associated with oxidative stress caused by a bacteria is sepsis.
- sepsis occurs when gram-negative bacteria enter the bloodstream.
- Liver damage caused by a toxic agent is another condition associated with an inflammatory process and oxidative stress.
- the toxic agent can be any agent which causes damage to the liver.
- the toxic agent can cause apoptosis and/or necrosis of liver cells.
- examples of such agents include alcohol, and medication, such as prescription and non- prescription drugs taken to treat a disease or condition.
- the methods of the present invention can also be used in reducing oxidative damage associated with any neurodegenerative disease or condition.
- the neurodegenerative disease can affect any cell, tissue or organ of the central and peripheral nervous system. Examples of such cells, tissues and organs include, the brain, spinal cord, neurons, ganglia, Schwann cells, astrocytes, oligodendrocytes and microglia.
- the neurodegenerative condition can be an acute condition, such as a stroke or a traumatic brain or spinal cord injury.
- the neurodegenerative disease or condition can be a chronic neurodegenerative condition.
- the free radicals can, for example, cause damage to a protein.
- An example of such a protein is amyloid ⁇ -protein.
- Examples of chronic neurodegenerative diseases associated with damage by free radicals include Parkinson's disease, Alzheimer's disease, Huntington's disease and Amyotrophic Lateral Sclerosis (also known as Lou Gherig's disease).
- Other conditions which can be treated in accordance with the present invention include preeclampsia, diabetes, and symptoms of and conditions associated with aging, such as macular degeneration, wrinkles.
- the peptides useful in the present invention may also be used in reducing oxidative damage in an organ of a mammal prior to transplantation.
- a removed organ when subjected to reperfusion after transplantation can be susceptible to oxidative damage. Therefore, the peptides can be used to reduce oxidative damage from reperfusion of the transplanted organ.
- the removed organ can be any organ suitable for transplantation. Examples of such organs include, the heart, liver, kidney, lung, and pancreatic islets.
- the removed organ is placed in a suitable medium, such as in a standard buffered solution commonly used in the art.
- a removed heart can be placed in a cardioplegic solution containing the peptides described above.
- concentration of peptides in the standard buffered solution can be easily determined by those skilled in the art. Such concentrations may be, for example, between about 0.01 nM to about 10 ⁇ M, preferably about 0.1 nM to about 10 ⁇ M, more preferably about l ⁇ M to about 5 ⁇ M , and even more preferably about 1 nM to about 100 nM.
- the invention provides a method for reducing oxidative damage in a cell in need thereof.
- Cells in need of reducing oxidative damage are generally those cells in which the cell membrane or DNA of the cell has been damaged by free radicals, for example, ROS and/or RNS.
- free radicals for example, ROS and/or RNS.
- Examples of cells capable of being subjected to oxidative damage include the cells described herein. Suitable examples of cells include pancreatic islet cells, myocytes, endothelial cells, neuronal cells, stem cells, etc.
- the cells can be tissue culture cells. Alternatively, the cells may be obtained from a mammal. In one instance, the cells can be damaged by oxidative damage as a result of an insult. Such insults include, for example, a disease or condition (e.g., diabetes, etc) or ultraviolet radiation (e.g., sun, etc.). For example, pancreatic islet cells damaged by oxidative damage as a result of diabetes can be obtained from a mammal.
- a disease or condition e.g., diabetes, etc
- ultraviolet radiation e.g., sun, etc.
- pancreatic islet cells damaged by oxidative damage as a result of diabetes can be obtained from a mammal.
- the peptides described above can be administered to the cells by any method known to those skilled in the art.
- the peptides can be incubated with the cells under suitable conditions. Such conditions can be readily determined by those skilled in the art.
- the treated cells may be capable of regenerating.
- Such regenerated cells may be administered back into the mammal as a therapeutic treatment for a disease or condition.
- a disease or condition is diabetes.
- Oxidative damage is considered to be "reduced” if the amount of oxidative damage in a mammal, a removed organ, or a cell is decreased after administration of an effective amount of the aromatic cationic peptides described above.
- the oxidative damage is considered to be reduced if the oxidative damage is decreased by at least about 10%, preferably at least about 25%, more preferably at least about 50%, even more preferably at least about 75%, and most preferably at least about 90%.
- the peptides useful in the methods of the present invention may be chemically synthesized by any of the methods well known in the art. Suitable methods for synthesizing the protein include, for example those described by Stuart and Young in “Solid Phase Peptide Synthesis,” Second Edition, Pierce Chemical Company (1984), and in “Solid Pltase Peptide Synthesis,” Methods Enzymol. 289, Academic Press, Inc, New York (1997).
- the peptide useful in the methods of the present invention is administered to a mammal in an amount effective in reducing oxidative damage.
- the effective a ⁇ nount is determined during pre-clinical trials and clinical trials by methods familiar to physicians and clinicians.
- An effective amount of a peptide useful in the methods of the present invention may be administered to a mammal in need thereof by any of a number of well-known methods for administering pharmaceutical compounds.
- the peptide may be administered systemically or locally.
- the peptide is administered intravenously.
- the aromatic-cationic peptides useful in the methods of the present invention may be administered via rapid intravenous bolus injection.
- the peptide is administered as a constant rate intravenous infusion.
- the peptide can be injected directly into coronary artery during, for example, angioplasty or coronary bypass surgery, or applied onto coronary stents.
- the peptide may also be administered orally, topically, intranasally, intramuscularly, subcutaneously, or transdermally.
- transdermal administration of the aromatic-cationic peptides by methods of the present invention is by iontophoresis, in which the charged peptide is delivered across the skin by an electric current.
- Other routes of administration include intracerebroventricularly or intrathecally.
- Intracerebroventiculatly refers to administration into the ventricular system of the brain. Intrathecally refers to administration into the space under the arachnoid membrane of the spinal cord.
- intracerebroventricular or intrathecal adrninistration may be prefened for those diseases and conditions which affect the organs or tissues of the central nervous system.
- intrathecal administration is used for traumatic spinal cord injury.
- the peptides useful in the methods of the invention may also be administered to mammals by sustained release, as is known in the art.
- Sustained release administration is a method of drug delivery to achieve a certain level of the drug over a particular period of time. The level typically is measured by serum or plasma concentration.
- any formulation known in the art of pharmacy is suitable for administration of the aromatic-catiomc peptides useful in the methods of the present invention.
- liquid or solid formulations may be used.
- Some examples of formulations include tablets, gelatin capsules, pills, troches, elixirs, suspensions, syrups, wafers, chewing gum and the like.
- the peptides can be mixed with a suitable pharmaceutical carrier (vehicle) or excipient as understood by practitioners in the art.
- Examples of earners and excipients include starch, milk, sugar, certain types of clay, gelatin, lactic acid, stearic acid or salts thereof, including magnesium or calcium stearate, talc, vegetable fats or oils, gums and glycols.
- formulations of the aromatic-cationic peptides useful in the methods of the present inventions may utilize conventional diluents, carriers, or excipients etc., such as are known in the art can be employed to deliver the peptides.
- the formulations may comprise one or more of the following: a stabilizer, a surfactant, preferably a nonionic surfactant, and optionally a salt and/or a buffering agent.
- the peptide may be delivered in the form of an aqueous solution, or in a lyophilized form.
- the stabilizer may, for example, be an amino acid, such as for instance, glycine; or an oligosaccharide, such as for example, sucrose, tetralose, lactose or a dextran.
- the stabilizer may be a sugar alcohol, such as for instance, mannitol; or a combination thereof.
- the stabilizer or combination of stabilizers constitutes from about 0.1% to about 10% weight for weight of the peptide.
- the surfactant is preferably a nonionic surfactant, such as a polysorbate.
- suitable surfactants include Tween20, Tween ⁇ O; a polyethylene glycol or a polyoxyethylene polyoxypropylene glycol, such as Pluronic F-68 at from about 0.001% (w/v) to about 10% (w/v).
- the salt or buffering agent may be any salt or buffering agent, such as for example, sodium chloride, or sodium/potassium phosphate, respectively.
- the buffering agent maintains the pH of the pharmaceutical composition in the range of about 5.5 to about 7.5.
- the salt and/or buffering agent is also useful to maintain the osmolality at a level suitable for administration to a human or an animal.
- the salt or buffering agent is present at a roughly isotonic concentration of about 150mM to about 300mM.
- the formulations of the peptides useful in the methods of the present invention may additionally contain one or more conventional additive.
- additives include a solubilizer such as, for example, glycerol; an antioxidant such as for example, benzalkonium chloride (a mixture of quaternary ammonium compounds, known as "quats"), benzyl alcohol, chloretone or chlorobutanol; anaesthetic agent such as for example a morphine derivative; or an isotonic agent etc., such as described above.
- a solubilizer such as, for example, glycerol
- an antioxidant such as for example, benzalkonium chloride (a mixture of quaternary ammonium compounds, known as "quats"), benzyl alcohol, chloretone or chlorobutanol
- anaesthetic agent such as for example a morphine derivative
- an isotonic agent etc. such as described above.
- the pharmaceutical compositions may be stored under nitrogen gas in vials
- the mammal treated in accordance with the invention can be any mammal, including, for example, farm animals, such as sheep, pigs, cows, and horses; pet animals, such as dogs and cats; laboratory animals, such as rats, mice and rabbits.
- farm animals such as sheep, pigs, cows, and horses
- pet animals such as dogs and cats
- laboratory animals such as rats, mice and rabbits.
- the mammal is a human.
- Example 1 [Dmt ⁇ DALDA penetrates cell membrane. [00131] The cellular uptake of [ 3 H] [Dmt ⁇ DALDA was studied using a human intestinal epithelial cell line (Caco-2), and confirmed with SH-SY5Y (human neuroblasto a cell), HEK293 (human embryonic kidney cell) and CRFK cells (kidney epithelial cell). Monolayers of cells were grown on 12- ell plates (5x10 5 cells/well) coated with collagen for 3 days.
- Caco-2 human intestinal epithelial cell line
- SH-SY5Y human neuroblasto a cell
- HEK293 human embryonic kidney cell
- CRFK cells kidney epithelial cell
- [00132] [ 3 H][Dmt * "]DALDA was observed in cell lysate as early as 5 min, and steady state levels were achieved by 30 min.
- the total amount of ⁇ HJfDmt ⁇ DALDA recovered in the cell lysate after 1 h incubation represented about 1% of the total drug.
- the uptake of [ ⁇ [Dmt ⁇ DALDA was slower at 4°C compared to 37°C, but reached 76.5% by 45 min and 86.3% by 1 h.
- the intemalization of [ 3 H][I rat 1 ]DALDA was not limited to Caco-2 cells, but was also observed in SH-SY5Y, HEK293 and CRFK cells.
- the intracellular concentration of [Dmt l ]DALDA was estimated to be approximately 50 times higher than extracellular concentration.
- the medium was then removed and cells were incubated with 1 ml of HBSS containing 0.1 ⁇ M to 1.0 ⁇ M of the fluorescent peptide analog at 37°C for 1 h. Cells were then washed three times with ice-cold HBSS and covered with 200 ⁇ l of PBS, and microscopy was performed within 10 min at room temperature using a Nikon confocal laser scamiing microscope with a C-Apochromat 63x/l .2W con objective. Excitation was performed at 340 nm by means of a UN laser, and emission was measured at 520 nm. For optical sectioning in z-direction, 5-10 frames with 2.0 ⁇ m were made.
- TMRM tetramethylrhodamine methyl ester
- CLSM showed the uptake of fluorescent [Dmt'AtnDap ⁇ DALDA into Caco-2 cells after incubation for as little as 15 min at 37°C. The uptake of dye was completely excluded from the nucleus, but the blue dye showed a streaky distribution within the cytoplasm. Mitochondria were labeled red with TMRM. The distribution of [Dmt 1 , AtnDap 4 ] DALDA to mitochondria was demonstrated by the overlap of the [Omt 1 ,AtnDap 4 ]DALDA distribution and the TMRM distribution.
- Example 3 Scavenging of hydrogen peroxide by SS-02 and SS-05 (figure 1).
- Results show that SS-02 and SS-05 dose-dependently inhibited the luminol response suggesting that these peptides can scavenge H 2 O 2 .
- Example 4 Inhibition of lipid peroxidation (figure 2) .
- Linoleic acid peroxidation was induced by a water-soluble initiator, ABAP (2,2'- azobis(2-amidinopropane)), and lipid peroxidation was detected by the formation of conjugated dienes, monitored spectrophotometrically at 236 nm (B. Longoni, W. A. Pryor, P. Marchiafava, Biochem. Biophys. Res. Commun. 233, 778-780 (1997) ).
- SS-01 which contains Tyr rather than Dmt is not as effective in preventing linoleic acid peroxidation.
- SS-29 is Dmt-D-Cit- Phe Lys-NH 2
- SS-30 is Phe-D-Arg-Dmt-Lys-NH 2
- SS-32 is Dmt-D-Arg-Phe-Ah ⁇ (2-aminoheptanoic acid)-NH 2 .
- Example 5 Inhibition of LDL oxidation (figure 3).
- Human LDL low density lipoprotein
- SS-29 is Dmt-D-Cit- Phe Lys- NH 2
- SS-30 is Phe-D-Arg-Dmt-Lys-NH 2
- SS-32 is Dmt-D-Arg-Phe-Ahp(2-aminoheptanoic acid)-NH 2 .
- Example 6 Hydrogen peroxide production by isolated mouse liver mitochondria (figure 4).
- 0.1 mg mitochondrial protein was added to 0.5 ml potassium phosphate buffer (100 mM, pH 8.0) in the absence or presence of SS peptides (100 ⁇ M). 25 mM luminol and 0.7 IU horseradish peroxidase were added, and chemilumunescence was monitored with a Chronolog Model 560 aggregometer (Havertown, PA) for 20 min at 37°C. The amount of H O 2 produced was quantified as the area under the curve (AUC) over 20 min, and all data were normalized to AUC produced by mitochondria alone.
- AUC area under the curve
- SS-29, SS-30 and SS-31 had no effect on H 2 O 2 production. Note that SS-21 and SS-22 do not contain a tyrosine or dimethyltyrosine residue.
- the amino acid Dmt (dimethyltyrosine) alone also inhibited H 2 O 2 generated.
- Example 7 SS-31 inhibits H 2 O 2 generation by isolated mitochondria (figure 5).
- mitochondrial protein was added to 0.5 ml potassium phosphate buffer (100 mM, pH 8.0) in the absence or presence of SS-31. 25 mM luminol and 0.7 IU horseradish peroxidase were added, and chemilumunescence was monitored with a Chronolog Model 560 aggregometer (Havertown, PA) for 20 min at 37°C. The amount of H 2 O 2 produced was quantified as the area under the curve (AUC) over 20 min, and all data were normaliized to AUC produced by mitochondria alone.
- AUC area under the curve
- Example 8 SS-02 and SS-31 reduced intracellular ROS and increased cell survival (figure 6).
- neuronal N 2 A cells were plated in 96-well plates at a density of 1 x 10 4 / well and allowed to grow for 2 days before treatment with tBHP (0.5 or 1 mM) for 40 min. Cells were washed twice and replaced with medium alone or medium containing varying concerntrations of SS-02 or SS- 31 for 4 hr. Intracellular ROS was measured by carboxy-H2DCFDA (Molecular Probes, Portland, OR). Cell death was assessed by a cell proliferation assay (MTS assay, Promega, Madison, WI). [00155] Incubation with tBHP resulted in dose-dependent increase in intracellular ROS
- Example 9 SS-31 prevented loss of cell viability (figure 7).
- Neuronal N 2 A and SH-S Y5Y cells were plated in 96-well plate at a density of 1 x
- tBHP t-butyl hydroperoxide
- Example 10 SS-31 decreased caspase activity (figure 8)
- N 2 A cells were grown on 96-well plates, treated with t-BHP (0.05 mM) in the absence or presence of SS-31 (10 " ⁇ M - 10 '8 M) at 37°C for 12-24 h. All treatments were canied out in quadriplicates.
- N 2 A cells were incubated with t-BHP(50 mM) with or without SS-31 at 37°C for 12 h. Cells were gently lifted from the plates with a cell detachment solution (Accutase, Innovative Cell Technologies, Inc., San Diego, CA) and washed twice in PBS. Caspase activity was assayed using the FLICA kit (Immunochemistry Technologies LLC, Bloomington, MN).
- cells were resuspended (approx. 5 x 10 6 cells/ml) in PBS and labeled with pan-caspase inhibitor FAM-VAD-FMK for 1 h at 37°C under 5% CO 2 and protected from the light. Cells were then rinsed to remove the unbound reagent and fixed. Fluorescence intensity in the cells was measured by a laser scanning cytometer (Beckman-Coulter XL, Beckman Coulter, Inc., Fullerton, CA) using the standard emission filters for green (FL1). For each ran, 10,000 individual events were collected and stored in list-mode files for off-line analysis.
- Caspase activation is the initiating trigger of the apoptotic cascade, and our results showed a significant increase in caspase activity after incubation of SH-S Y5 Y cells with 50 mM t-BHP for 12 h which was dose-dependently inhibited by increasing concentrations of SS-31.
- Example 11 SS-31 reduced rate of ROS accumulation (figure 9)
- DCFH-DA enters cells passively and is then deacetylated to nonfluorescent DCFH.
- DCFH reacts with ROS to form DCF, the fluorescent product.
- N 2 A cells in 96 sell plates were washed with HBSS and loaded with 10 ⁇ M of DCFDA for 30 min. for 30 min. at 37°C. Cells were washed 3 times with HBSS and exposed to 0.1 mM of t-BHP, alone or with SS-31. The oxidation of DCFH to DCF was monitored in real time by a fluorescence microplate reader (Molecular Devices) using 485 nm for excitation and 530 nm for emission.
- Example 12 SS-31 inhibited lipid peroxidation in cells exposed to oxidative damage (figure 10)
- SS-31 inhibited lipid peroxidation in N 2 A cells treated with t-BHP. Lipid peroxidation was evaluated by measuring HNE Michael adducts. 4-HNE is one of the major aldehydic products of the peroxidation of membrane polyunsaturated fatty acids. N 2 A cells were seeded on glass bottom dish 1 day before t-BHP treatment (1 mM, 3 h, 37°C, 5% CO 2 ) in the presence of absence of SS-31 (10 "8 to 10 "10 M). Cells were then washed twice with PBS and fixed 30 min with 4% paraformaldehyde in PBS at RT and then washed 3 times with PBS.
- Example 13 SS-02 inhibits loss of mitochondrial potential in cells exposed to hydrogen peroxide.
- Example 14 SS-31 prevents loss of mitochondrial potential and increased ROS accumulation in N A cells caused by exposure to t-BHP (figure 11)
- Example 15 SS-31 prevents apoptosis caused by oxidative stress (figure 12)
- SH-SY5Y cells were grown on 96-well plates, treated with t-BHP (0.025 mM) in the absence or presence of SS-31 (10 "12 M - 10 "9 M) at 37°C for 24 h. All treatments were earned out in quadriplicates. Cells were then stained with 2 mg/ml Hoechst 33342 for 20 min, fixed with 4% paraformaldehyde, and imaged using a Zeiss fluorescent microscope (Axiovert 200M) equipped with the Zeiss Acroplan x20 objective. Nuclear morphology was evaluated using an excitation wavelength of 350 + 10 nm and a longpass filter of 400 nm for emission. All images were processed and analyzed using the MetaMorph software (Universal Imaging Corp., West Chester, PA). Uniformly stained nuclei were scored as healthy, viable neurons, while condensed or fragmented nuclei were scored as apoptotic.
- SS-31 prevents apoptosis induced by a low dose of t-BHP. Apoptosis was evaluated by confocal microscopy with the fluorescent probe Hoechst 33342.
- Apoptosis was evaluated by confocal microscopy with the fluorescent probe Hoechst 33342.
- (Al) a representative field of cells not treated with t-BHP.
- (A2) Fluorescent image showing a few cells with dense, fragmented chromatin indicative of apoptotic nuclei.
- A3 A representative field of cells treated with 0.025 mM t-BHP for 24 h.
- A4 Fluorescent image showing an increased number of cells with apoptotic nuclei.
- A5 A representative field of cells treated with 0.025 mM t-BHP and 1 nM SS-31 for 24 h.
- (A6) Fluorescent image showing a reduced number of cells with apoptotic nuclei.
- Example 16 SS-31 prevents lipid peroxidation in hearts subjected to brief intervals of ischemia- reperfusion. ( Figure 13)
- HNE 4-hydroxy-2-nonenol
- Example 17 SS-31 increases coronary flow and reduces lipid peroxidation and apoptosis in hearts subjected to prolonged cold ischemia followed by warm reperfusion ( Figure 14).
- Isolated guinea pig hearts were perfused in a retrograde manner in a Langendorff apparatus with a cardioplegic solution (St. Thomas solution) without or with SS-31 (1 nM) for 3 min, and then clamped and stored at 4°C for 18 h. Subsequently the hearts were remounted in the Langendorff apparatus and reperfused with Krebs-Henseleit solution at 34°C for 90min. Hearts were then rapidly fixed and paraffin-embedded.
- (C) SS-31 prevents apoptosis in endothelial cells and myocytes in isolated guinea pig hearts subjected to warm reperfusion after prolonged (18 h) cold ischemia. Apoptosis was assessed by the TUNEL stain (green) and nuclei are visualized by DAPI (blue).
- Example 18 improves survival of islet cells isolated from mouse pancreas ( Figure 15).
- SS-31 improves mitochondrial potential in islet cells isolated from mouse pancreas. Pancreas was harvested from mice and islet cells were prepared according standard procedures. In some studies, SS-31 (1 nM) was added to all isolation buffers used throughout the isolation procedure. Mitochondrial potential was measured using TMRM (red) and visualized by confocal microscopy.
- SS-31 reduces apoptosis and increases viability in islet cells isolated from mouse pancreas. Pancreas was harvested from mice and islet cells were prepared according standard procedures. In some studies, SS-31 (1 nM) was added to all isolation buffers used throughout the isolation procedure. Apoptosis was ascertained by flow cytometry using annexin V and necrosis by propidium iodide.
- Example 19 protects against oxidative damage in pancreatic islet cells (Figure 16).
- Mouse pancreatic islet cells were untreated (a), or treated with 25 ⁇ M tBHP without (b) or with 1 nM SS-31 (c). Mitochondrial potential was measured by TMRM (red) and reactive oxygen species were measured by DCF (green) using confocal microscopy.
- MPTP is a neurotoxin that selectively destroys striatal dopamine neurons and can be used as an animal model of Parkinson's Disease.
- MPP + a metabolite of MPTP, targets mitochondria, inhibits complex I of the electron transport chain and increases ROS production.
- MPP + is used in cell culture studied because cells are unable to metabolize MPTP to the active metabolite.
- MPTP is used for animal studies.
- SS-31 protects dopamine cells against MPP toxicity.
- SN-4741 cells were treated with buffer, 50 ⁇ M MPP + or 50 ⁇ M MPP + and 1 nM SS-31, for 48 h, and the incidence of apoptosis was determined by fluorescent microscopy with Hoechst 33342. The number of condensed fragmented nuclei was significantly increased by MPP+ treatment. Concunent treatment with SS-31 reduced the number of apoptotic cells.
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JP2006551350A JP4931604B2 (en) | 2004-01-23 | 2005-01-21 | Methods for reducing oxidative damage |
EP05711878A EP1722807A4 (en) | 2004-01-23 | 2005-01-21 | Methods for reducing oxidative damage |
CN2005800082000A CN1938042B (en) | 2004-01-23 | 2005-01-21 | Use of aromatic cation peptide in preparing medicine for relieving oxidative damage |
BRPI0507053-8A BRPI0507053A (en) | 2004-01-23 | 2005-01-21 | methods for reducing oxidative damage to a mammal in need of a mammal, an organ removed from a mammal and a cell in need of it |
NZ549393A NZ549393A (en) | 2004-01-23 | 2005-01-21 | Methods for reducing oxidative damage |
AU2005208821A AU2005208821B8 (en) | 2003-02-04 | 2005-01-21 | Methods for reducing oxidative damage |
CA2554166A CA2554166C (en) | 2004-01-23 | 2005-01-21 | Methods for reducing oxidative damage |
KR1020067016975A KR101159254B1 (en) | 2004-01-23 | 2005-01-21 | Methods for reducing oxidative damage |
IL177030A IL177030A (en) | 2004-01-23 | 2006-07-23 | Use of d-arg-2',6'-dmt-lys-phe-nh2 for manufacturing a medicament for reducing oxidative damages in a mammal, peptides consisting of the amino acid sequence d-arg-2',6'-dmt-lys-phe-nh2 and compositions comprising them |
ZA2006/07013A ZA200607013B (en) | 2004-01-23 | 2006-08-22 | Methods for reducing oxidative damage |
HK07110349.0A HK1102289A1 (en) | 2004-01-23 | 2007-09-24 | Use of an aromatic cationic peptide in preparing the medicaments for reducing oxidative damage |
IL235772A IL235772A (en) | 2004-01-23 | 2014-11-18 | Synthetic tetrapeptide and composition thereof |
IL237408A IL237408B (en) | 2004-01-23 | 2015-02-25 | Methods for reducing oxidative damage |
IL237407A IL237407B (en) | 2004-01-23 | 2015-02-25 | Use of an aromatic-cationic peptide for manufacturing a medicament for reducing oxidative damage |
IL256703A IL256703B (en) | 2004-01-23 | 2018-01-02 | Methods for reducing oxidative damage |
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