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Biomedical subjects

K Berg

Publications and source records attributed to K Berg.

At least 73 records · Page 4Linked to original sources
PubMed2000

Altered circulating levels of adhesion molecules at 18 weeks' gestation among women with eventual preeclampsia: indicators of disturbed placentation in absence of evidence of endothelial dysfunction?

OBJECTIVE: The purpose of this study was to investigate whether indications of activation of the maternal endothelium were present at 18 weeks' gestation in women in whom preeclampsia eventually developed. STUDY DESIGN: A total of 2190 blood samples were obtained at 18 weeks' gestation. Circulating levels of von Willebrand factor and soluble vascular adhesion molecule 1, soluble intercellular adhesion molecule 1, and E-selectin were assayed in 71 women with eventual preeclampsia and 71 control subjects. RESULTS: E-selectin and von Willebrand factor levels were similar between the 2 groups. Soluble vascular adhesion molecule 1 concentration was significantly lower in the women with eventual preeclampsia (median, 649.0 ng/mL vs 762.4 ng/mL; P <.001), whereas soluble intercellular adhesion molecule 1 concentration was significantly higher (median, 239.8 ng/mL vs 178.3 ng/mL; P <.001). CONCLUSION: We found no indications of endothelial activation at 18 weeks' gestation in women in whom preeclampsia later developed. However, decreased serum concentration of soluble vascular adhesion molecule 1 and increased serum concentration of soluble intercellular adhesion molecule 1 may reflect the disturbed placentation known to be associated with the development of preeclampsia.

Birth Weight↗
PubMed2000

The acute coronary syndrome diagnosis and prognostic evaluation by troponin I is influenced by the test system affinity to different troponin complexes.

It was suggested recently that cardiac troponins are released as T-I-C complexes and then further degraded to T and I-C. It is not known whether the various affinity to the T-I-C and I-C complex of different troponin I test systems influence the diagnostic and prognostic value of the test results in clinical practice. We studied 162 patients (61.3 S.D. 11.1 years) with suspected acute myocardial infarction (AMI) in a single center study. AMI was confirmed in 109 patients. Blood samples were taken at admission, after 1, 2, 4, 8, 12 and 24 h. Troponin I (TnI) was measured using the OPUS plus (TnI-O, cut-off 1.6 microg/l) and the Stratus II (TnI-S, cut-off 1.5 microg/l) analyzers. TnI-O has high affinity to the binary (I-C) and TnI-S to the ternary (T-I-C) troponin complex. A 6-month follow-up with respect to death and recurrent AMI was performed. The sensitivity (SE) and specificity (SP) for AMI diagnosis were 82.6 and 86.8% for TnI-S; 75.2 and 92.5% for TnI-O 0-2 h after admission. The ROC analysis showed a slightly better curve for TnI-S at 4 h (P<0.05). Logistic regression analysis shows prediction of 6 months outcome by 0-24 h serial TnI-S measurements (odds ratio 5.21, P=0.0356), and serial TnI-O measurements (odds ratio 4.92, P=0.0186). High affinity to the ternary troponin complex enhances the diagnostic but not the prognostic value of a test system. Indeed, the resulting differences are small but underline the need for standardization of biochemical markers.

Acute Disease↗
PubMed2000

Histopathology of arterial lesions in LPA transgenic mice on cholesterol-enriched chow.

The aortic root from 21 LPA transgenic mice and 18 control litter mates on cholesterol enriched chow were studied histologically for the presence of atherosclerotic lesions. Serial sections were cut and the total area of the lesions was measured by use of computerised image analysis. Lipid staining lesions were found in 17 aortas of the transgenic mice and were five times more common than in the controls. Foam cell lesions were the only type of lesion in 12 of the aortas from transgenic animals, while five animals had developed fibrofatty lesions. Immunostaining revealed monocytes/macrophages on the endothelial surface, and in the subendothelial space of foam cell lesions. In fibrofatty lesions, spindle shaped cells formed a cap around the lipid core. This study supports the view that transgenic mice expressing human apolipoprotein (a) on a high fat and cholesterol diet, are more susceptible to aortic lesions than control mice and develop early atherosclerotic lesions comparable to lesions in man. Aminoguanidin in the drinking water had no effect on the aortic lesions, but lesion size was significantly, negatively correlated with plasma glucose concentration.

Animals↗
PubMed2000

Sequence conservation in kringle IV-type 2 repeats of the LPA gene.

We have studied the homology of repeating kringle IV-type 2 (K IV-type 2) elements of the LPA gene. Two K IV-type 2 genomic polymerase chain reaction (PCR) fragment libraries were constructed, one from an individual with high and one from an individual with low Lp(a) lipoprotein level. Only minor K IV-type 2 repeat length heterogeneity was observed. Sequence analysis data from the cloned K IV-type 2 repeats revealed a high degree of LPA sequence conservation in exons as well as in introns both within and between the two libraries. This sequence conservation of the IV-type 2 kringles is in agreement with our previously reported results of simultaneous 'batch' DNA sequence analyses of all the K IV-type 2 repeats from single individuals. Sequence data from the clones, combined with genomic DNA sequencing, revealed that the K IV-type 2 reading frame of exons 1 and 2 are extended into the conserved flanking introns by 519 base pairs (bp) and 312 bp, respectively. The theoretical coding capacity of the exon 1 extended open reading frame (ORF I) is three times larger (173 amino acids, aa) than the translated exon 1, and that of the extended open reading frame of exon 2 (ORF II) is about twice (104 aa) the length of exon 2. A central portion of the intron separating exons 1 and 2 also exhibited a high degree of sequence conservation, with the exception of a polymorphic CA repeat. Within the 61 K IV repeat clones analysed, 19 different CA repeat patterns with 12-18 CA dinucleotide repeats were observed. A comparison between the 37 clones from the individual with high Lp(a) lipoprotein level and the 24 clones from the individual with low Lp(a) lipoprotein level, revealed that seven of the CA repeat variants were present in both clone libraries. The observed high level of sequence conservation in K IV-type 2 exons and introns matches relevant areas of the plasminogen gene, and our findings fit with recent K IV-type 2 duplications and evolutionary selection pressure theories, although gene conversion events could also explain the findings. DNA sequences within K IV-type 2 appeared to have no influence on Lp(a) lipoprotein level.

Adolescent↗
PubMed2000

Patient satisfaction with the information provided at a psychiatric emergency unit.

OBJECTIVE: Evaluation of patient satisfaction with information at a psychiatric emergency unit. DESIGN: Patient survey. SETTING: Psychiatric patients assessed information provided by staff on illness, symptoms, treatment alternatives, treatment design, medication, time schedule for treatment and the expected therapeutic response. PARTICIPANTS: The sample included 100 subjects (63% response rate). OUTCOME MEASURE: Patient satisfaction. RESULTS: 59% were women. Mean age was 43 years. 87% were Swedish. 30% had psychotic, 35% bipolar and 35% anxiety disorders. 87% were admitted voluntarily. Almost 80% were satisfied with the patient-staff relationship. Questions on information, except medication, scored low. Patients with non-psychotic disorder were more satisfied with information on symptoms, treatment alternatives and treatment design, and voluntary patients with information about medication. Patients born in Sweden and voluntary patients awarded influence on treatment planning higher scores. CONCLUSIONS: Psychiatric patients requiring emergency care did understand information. The staff provided satisfactory information only when knowledgeable.

Adult↗
PubMed2000

Recruitment experience in the first phase of the African American Hereditary Prostate Cancer (AAHPC) study.

The African American Hereditary Prostate Cancer (AAHPC) Study is an ongoing multicenter genetic linkage study organized by Howard University and the National Human Genome Research Institute (NHGRI), with support from the Office for Research on Minority Health and the National Cancer Institute. The goals of the study are to: (i) look for evidence of involvement of chromosome 1q24-25 (HPC1) in African American men with hereditary prostate cancer (HPC) and (ii) conduct a genome-wide search for other loci associated with HPC in African American men. To accomplish these goals, a network has been established including Howard University, the NHGRI, and six Collaborative Recruitment Centers (CRCs). The CRCs are responsible for the identification and enrollment of 100 African American families. To date, 43 families have been enrolled. Recruitment strategies have included mass media campaigns, physician referrals, community health-fairs/prostate cancer screenings, support groups, tumor registries, as well as visits to churches, barber shops, and universities. By far, the most productive recruitment mechanisms have been physician referrals and tumor registries, yielding a total of 35 (81%) families. Approximately 41% (n = 3400) of probands initially contacted by phone or mail expressed interest in participating; the families of 2% of these met the eligibility criteria, and 75% of those families have been enrolled in the study, indicating a 0.5% recruitment yield (ratio of participants to contacts). As the first large-scale genetic linkage study of African Americans, on a common disease, the challenges and successes of the recruitment process for the AAHPC Study should serve to inform future efforts to involve this population in similar studies.

Black or African American↗
PubMed2000

LPA gene: interaction between the apolipoprotein(a) size ('kringle IV' repeat) polymorphism and a pentanucleotide repeat polymorphism influences Lp(a) lipoprotein level.

OBJECTIVES: In order to search for factors influencing the Lp(a) lipoprotein level, we have examined the apolipoprotein(a) (apo(a)) size polymorphism as well as a pentanucleotide (TTTTA) repeat polymorphism in the 5' control region of the LPA gene. DESIGN: Lp(a) lipoprotein levels were compared between individuals with different genotypes as defined by pulsed field gel electrophoresis of DNA plugs, and PCR of DNA samples followed by polyacrylamide gel electrophoresis. DNA plugs and DNA were prepared from blood samples collected from blood donors. RESULTS: Twenty-seven different K IV repeat alleles were observed in the 71 women and 92 men from which apo(a) size polymorphism results were obtained. Alleles encoding 26-32 Kringle IV repeats were the most frequent. Alleles encoding seven to 11 TTTTA repeats were detected in the 84 women and 122 men included in the pentanucleotide polymorphism study, and homozygosity for eight TTTTA repeats was the most common genotype. The eight TTTTA repeat allele occurred with almost any apo(a) allele. An inverse relationship between number of K IV repeats and Lp(a) concentration was confirmed. The contributions of the apo(a) size polymorphism and the pentanucleotide repeat polymorphism to the interindividual variance of Lp(a) lipoprotein concentrations were 9.7 and 3.5%, respectively (type IV sum of squares). Nineteen per cent of the variance in Lp(a) lipoprotein level appeared to be the result of the multiplication product (interaction) between the apo(a) size polymorphism and the pentanucleotide repeat polymorphism. CONCLUSIONS: The contribution of the apo(a) size polymorphism alone to the variation in Lp(a) lipoprotein level was lower than previously reported. However, the multiplicative interaction effect between the K IV repeat polymorphism and the pentanucleotide repeat polymorphism may be an important factor explaining the variation in Lp(a) lipoprotein levels among the populations.

Adult↗
PubMed2000

Increased plasma concentrations of TGF-beta1 after hormone replacement therapy.

OBJECTIVES AND DESIGN: Hormone replacement therapy (HRT) in postmenopausal women may reduce the cardiovascular risk. A dominant protective role of transforming growth factor beta (TGF-beta1) on coronary arteries has been proposed. Lp(a) lipoprotein may block the activation of latent TGF-beta1. Given this background, we examined the effects of HRT on TGF-beta1 and Lp(a) lipoprotein in 99 postmenopausal women. The women had angiographically documented coronary heart disease (CHD) and were randomized to either sequential transdermal 17beta-oestradiol for 14 weeks and then medroxyprogesterone (MPA) for 14 days (HRT) or to a control group (C). RESULTS: Serum levels of TGF-beta1 were increased in the HRT group compared with the C group after 3 months' treatment and this effect was sustained after 12 months. There was a significant reduction in Lp(a) lipoprotein serum levels after 3 months' treatment in the HRT group compared with the C group. However, after 12 months, no significant difference in changes in Lp(a) lipoprotein serum levels was detected between the two groups. CONCLUSION: The novel observation that transdermal 17beta-oestradiol in postmenopausal women increases levels of TGF-beta1 and lowers the concentration of Lp(a) lipoprotein suggests yet another possible mechanism for the cardioprotective effect of HRT. Whereas combination therapy of oestradiol and MPA preserves the beneficial effect on TGF-beta1, it reduces the unopposed oestradiol effects on Lp(a) lipoprotein.

Administration, Cutaneous↗
PubMed2000

The carboxyl terminus of v-Abl protein can augment SH2 domain function.

Abelson murine leukemia virus (Ab-MLV) transforms NIH 3T3 and pre-B cells via expression of the v-Abl tyrosine kinase. Although the enzymatic activity of this molecule is absolutely required for transformation, other regions of the protein are also important for this response. Among these are the SH2 domain, involved in phosphotyrosine-dependent protein-protein interactions, and the long carboxyl terminus, which plays an important role in transformation of hematopoietic cells. Important signals are sent from each of these regions, and transformation is most likely orchestrated by the concerted action of these different parts of the protein. To explore this idea, we compared the ability of the v-Src SH2 domain to substitute for that of v-Abl in the full-length P120 v-Abl protein and in P70 v-Abl, a protein that lacks the carboxyl terminus characteristic of Abl family members. Ab-MLV strains expressing P70/S2 failed to transform NIH 3T3 cells and demonstrated a greatly reduced capacity to mediate signaling events associated with the Ras-dependent mitogen-activated protein (MAP) kinase pathway. In contrast, Ab-MLV strains expressing P120/S2 were indistinguishable from P120 with respect to these features. Analyses of additional mutants demonstrated that the last 162 amino acids of the carboxyl terminus were sufficient to restore transformation. These data demonstrate that an SH2 domain with v-Abl substrate specificity is required for NIH 3T3 transformation in the absence of the carboxyl terminus and suggest that cooperativity between the extreme carboxyl terminus and the SH2 domain facilitates the transmission of transforming signals via the MAP kinase pathway.

3T3 Cells↗
PubMed2000

Induction of multinucleated cells caused by UVA exposure in different stages of the cell cycle.

Fibroblasts of the line 3T3 from swiss albino mice were exposed to ultraviolet A (UVA) irradiation. The cells were synchronized by treatment with nocodazole and mitotic shake-off, and then exposed to UVA irradiation in different stages of the cell cycle. Their photosensitivity varied through the cell cycle, being greatest in the G2 phase. UVA irradiation was found to induce the formation of multinucleated cells. Cells in the G1 phase were found to be most prone to multinucleation 15 min after UVA irradiation, while cells exposed to UVA irradiation in S and G2 phases contained the largest fractions of multinucleated cells 24 h after treatment. The present results indicate that multinucleated cells are formed by fusion of two or more cells shortly after UVA irradiation of early G1 cells, while impairment of cytokinesis is a possible explanation for the delayed formation of multinucleated cells after irradiation in S and G2.

3T3 Cells↗
PubMed2000

5-aminolevulinic acid, but not 5-aminolevulinic acid esters, is transported into adenocarcinoma cells by system BETA transporters.

5-aminolevulinic acid (5-ALA) and its ester derivatives are used in photodynamic therapy as precursors for the formation of photosensitizers. This study relates to the mechanisms by which 5-ALA is transported into cells. The transport of 5-ALA has been studied in a human adenocarcinoma cell line (WiDr) by means of [14C]-labeled 5-ALA. The rate of uptake was saturable following Michaelis-Menten kinetics (K(m) = 8-10 mM and Vmax = 18-20 nmol.(mg protein x h)-1), and Arrhenius plot of the temperature-dependent uptake of 5-ALA was characterized by a single discontinuity at 32 degrees C. The activation energy was 112 kJ.mol-1 in the temperature range 15 degrees-32 degrees C and 26 kJ.mol-1 above 32 degrees C. Transport of 5-ALA was Na+ and partly Cl(-)-dependent. Stoichiometric analysis revealed a Na+:5-ALA coupling ratio of 3:1. With the exception of valine, methionine and threonine, zwitterionic and basic amino acids inhibited the transport of 5-ALA. 5-ALA methyl ester was not an inhibitor of 5-ALA uptake. The transport was most efficiently inhibited, i.e. by 65-75%, by the beta-amino acids, beta-alanine and taurine and by gamma-aminobutyric acid (GABA). Accordingly, 5-ALA, but not 5-ALA methyl ester, was found to inhibit cellular uptake of [3H]-GABA and [14C]-beta-alanine. Protoporphyrin IX (PpIX) accumulation in the presence of 5-ALA (0.3 mM) was attenuated 85% in the presence of 10 mM beta-alanine, while PpIX formation in cells treated with 5-ALA methyl ester (0.3 mM) or 5-ALA hexyl ester (4 microM) was not significantly influenced by beta-alanine. Thus, 5-ALA, but not 5-ALA esters, is transported by beta-amino acid and GABA carriers in this cell line.

Adenocarcinoma↗
PubMed2000

Use of a reference material proposed by the International Federation of Clinical Chemistry and Laboratory Medicine to evaluate analytical methods for the determination of plasma lipoprotein(a).

BACKGROUND: As part of the NIH/National Heart, Lung and Blood Institute Contract for the Standardization of Lipoprotein(a) [Lp(a)] Measurements, a study was performed in collaboration with the IFCC Working Group for the Standardization of Lp(a) Assays. The aims of the study, performed with the participation of 16 manufacturers and 6 research laboratories, were to evaluate the IFCC proposed reference material (PRM) for its ability to transfer an accuracy-based value to the immunoassay calibrators and to assess concordance in results among different methods. METHODS: Two different purified Lp(a) preparations with protein mass concentrations determined by amino acid analysis were used to calibrate the reference method. A Lp(a) value of 107 nmol/L was assigned to PRM. After uniformity of calibration was demonstrated in the 22 evaluated systems, Lp(a) was measured on 30 fresh-frozen sera covering a wide range of Lp(a) values and apolipoprotein(a) [apo(a)] sizes. RESULTS: The among-laboratory CVs for these samples (6-31%) were, in general, higher than those obtained for PRM (2.8%) and the quality-control samples (14%, 12%, and 9%, respectively), reflecting the broad range of apo(a) sizes in the 30 samples and the sensitivity of most methods to apo(a) size heterogeneity. Thus, although all of the assays were uniformly calibrated through the use of PRM, no uniformity in results was achieved for the isoform-sensitive methods. CONCLUSIONS: Linear regression analyses indicated that to various degrees, apo(a) size heterogeneity affects the outcome of the immunochemical methods used to measure Lp(a). We have also shown that the inaccuracy of Lp(a) values determined by methods sensitive to apo(a) size significantly affects the assessment of individual risk status for coronary artery disease.

Calibration↗
PubMed1999

Photochemical internalization: a novel technology for delivery of macromolecules into cytosol.

The therapeutic usefulness of macromolecules, such as in gene therapy, is often limited by an inefficient transfer of the macromolecule to the cytosol and a lack of tissue-specific targeting. The possibility of photochemically releasing macromolecules from endosomes and lysosomes into the cytosol was examined. Endocytosed macromolecules and photosensitizer were exposed to light and intracellular localization and the expression of macomolecules in the cytosol was analyzed. This novel technology, named photochemical internalization (PCI), was found to efficiently deliver type I ribosome-inactivating proteins, horseradish peroxidase, a p21ras-derived peptide, and a plasmid encoding green fluorescent protein into cytosol in a light-dependent manner. The results presented here show that PCI can induce efficient light-directed delivery of macromolecules into the cytosol, indicating that PCI may have a variety of useful applications for site-specific drug delivery, e.g., in gene therapy, vaccination, and cancer treatment.

Cytosol↗
PubMed1999

Manganese dipyridoxyl diphosphate: MRI contrast agent with antioxidative and cardioprotective properties?

Manganese dipyridoxyl diphosphate (MnDPDP) is a contrast agent for magnetic resonance imaging (MRI) of the liver. Aims of the study were to examine if MnDPDP possesses superoxide dismutase (SOD) mimetic activity in vitro, and if antioxidant protection can be demonstrated in an ex vivo rat heart model. Superoxide (*O-2) and hydroxyl radicals (*OH-) were generated in xanthine oxidase and Fenton reactions. Spin adducts with 5,5-dimethyl-1-pyrroline-N-oxide were detected by electron spin resonance spectroscopy. Contractile function and enzyme release were monitored in rat hearts during hypoxia-reoxygenation. Low microM concentrations of MnDPDP and its metabolite Mn dipyridoxyl ethylene-diamine (MnPLED) dismutated *O-2, but showed no activity in Fenton or catalase reactions. MnDPDP 30 microM improved contractile function and reduced enzyme release in rat hearts during reoxygenation. It is concluded that MnDPDP and MnPLED possess SOD mimetic activities and may thereby protect the heart in oxidative stress.

Animals↗
PubMed1999

Myocardial manganese elevation and proton relaxivity enhancement with manganese dipyridoxyl diphosphate. Ex vivo assessments in normally perfused and ischemic guinea pig hearts.

Manganese (Mn) dipyridoxyl diphosphate (MnDPDP) is the active component of a contrast medium for liver MRI. By being metabolized, MnDPDP releases Mn(2+), which is taken up and retained in hepatocytes. The study examined whether MnDPDP elevates Mn content and enhances proton relaxivity in normal myocardium, but not in ischemic myocardium with reduced coronary flow and impaired metabolism. Isolated guinea pig hearts were perfused at normal flow or low flow, inducing global subtotal ischemia. Ventricular ATP and Mn contents, T(1) and T(2) were measured. At normal flow tissue Mn content increased from the control level of 4.1 to 70.4 micromol/100g dry wt with MnDPDP (3000 microM), while low-flow perfusion with MnDPDP (3000 microM) resulted in a Mn content of 16.6 micromol/100 g dry wt. Prolonged ischemia (35 and 90 min) reduced tissue Mn down to the control level. T(1) shortening closely paralleled myocardial Mn elevations during both normal and low-flow perfusion. The use of a Mn(2+)-releasing contrast agent like MnDPDP may be a promising principle in MRI assessments of myocardial function and viability in coronary heart disease by revealing a differential pattern of changes in T(1) relative to coronary flow, cell Mn uptake and retention, ion channel function and metabolism.

Animals↗
PubMed1999

Whole blood folate, homocysteine in serum, and risk of first acute myocardial infarction.

High level of total homocysteine (tHcy) is a risk factor for coronary artery disease (CAD), but the mechanism is not known. The serum concentration of tHcy, total cholesterol, high density lipoprotein cholesterol (HDL-C), and apolipoprotein A-I (apo A-I) and the concentration of folate in whole blood were measured in 107 patients with first acute myocardial infarction (MI) and 103 controls. The level of whole blood folate was lower and that of tHcy higher in cases than in controls. An increase of 50 nmol/l whole blood folate was associated with an OR for MI of 0.75, and an increase of 5 micromol/l tHcy with an OR for MI of 1.57. Correlations were observed between the levels of whole blood folate and tHcy and between whole blood folate and alcohol intake, and in MI cases, between tHcy, HDL-C, and apo A-I as well as between HDL-C and alcohol intake. The number of cigarette smokers was higher among cases than controls. In smokers, the level of tHcy was higher and that of whole blood folate lower than in non-smokers. After adjustment for smoking, the whole blood folate and tHcy-associated risks of MI became non-significant. We conclude that smoking may affect folate status and tHcy level adversely. The risk of MI in smokers may at least partly be attributed to hyperhomocysteinemia or low folate.

Age Distribution↗
PubMed1999

Photodynamically induced effects in colon carcinoma cells (WiDr) by endogenous photosensitizers generated by incubation with 5-aminolaevulinic acid.

Human adenocarcinoma cells of the line WiDr have been treated with 2 mM 5-aminolaevulinic acid (5-ALA) in the presence of 10% foetal calf serum. The treatment induces a linear accumulation of protoporphyrin IX (PpIX) for at least 7.5 h. After 7.5 h of incubation about 45% of the PpIX accumulated is cell-bound, while the rest is found in the medium (25%) or lost from the cells during washing with phosphate-buffered saline (30%). Exposure to white light at an intensity of 30 W/m2 for 18 min results in 95% reduction of clonogenicity in cells treated with 2 mM 5-ALA for 3.5 h. The enzymatic activities of enzymes located in cytosol (glyceraldehyde 3-phosphate dehydrogenase and lactate dehydrogenase) and lysosomes (acid phosphatase and beta-glucuronidase) are not influenced by a 5-ALA and light treatment inactivating about 35% of the cells. The MTT assay, which reflects mitochondrial dehydrogenase activity, but not succinate dehydrogenase, is partly inhibited by the same treatment. Treatment with 5-ALA in the absence of light increases O2 consumption by a factor of two, while the O2 consumption is inhibited when 5-ALA treatment is combined with exposure to light. In addition, 5-ALA and light exposure enhance accumulation of rhodamine 123 by 40% and reduce the intracellular ATP level by 25%. Confocal laser scanning microscopical analysis indicates granular perinuclear localization of the PpIX formed by 5-ALA treatment. In conclusion, photodynamic treatment using 5-ALA as a prodrug induces damage to mitochondrial function without inhibiting lysosomal and cytosolic marker enzymes.

Adenosine Triphosphate↗