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Glucocorticoid activates glomerular antioxidant enzymes and protects glomeruli from oxidant injuries.

We examined the effect of glucocorticoid on intrinsic glomerular antioxidant enzyme (AOE) activities. Munich-Wistar rats were treated with daily i.p. injection of vehicle or methylprednisolone [MP, 15 mg/kg body wt, (MP15)] either for three days or nine days. Glomeruli isolated from rats given MP15 had significantly higher activities of total (T-) and manganese (Mn-) superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and catalase than vehicle-treated rats (P less than 0.05). MP15-treated rats were subjected to intrarenal arterial infusion of hydrogen peroxide (35 mumol over 1 hr). Values for urinary protein excretion rate (UprV) after hydrogen peroxide infusion were markedly lower in rats pretreated with MP15 for both three days and nine days than in untreated rats (109 +/- 18 and 55 +/- 24 vs. 416 +/- 73 micrograms/min, respectively, both P less than 0.005). To test whether the same therapeutic intervention attenuates reactive oxygen species (ROS)-mediated glomerular injury in another model, rats given a single i.v. dose of puromycin aminonucleoside (PAN) (50 mg/kg body wt) were treated with daily i.p. injection of vehicle or MP15. Two days after PAN administration, when compared to vehicle-treated controls, PAN rats given MP15 had significantly higher activities of Mn-SOD, GSH-Px and catalase. After eight days of PAN injection, T- and Mn-SOD activities were, likewise, significantly higher in MP15- than vehicle-treated PAN rats. PAN rats given MP15 also had substantially less proteinuria, compared to PAN rats given vehicle alone, UprV averaging 32.3 +/- 9.4 versus 159.0 +/- 13.8 mg/24 hr (P less than 0.05). Elevated glomerular malondialdehyde (MDA) level characteristic of PAN rats was absent in rats treated with MP15. Moreover, epithelial foot process fusion and cell vacuolization seen in vehicle-treated PAN rats were markedly attenuated in MP15-treated PAN rats. These data indicate that the mechanism for therapeutic effect of glucocorticoids on ROS-mediated renal injuries includes an enhancement of endogenous glomerular AOE activities, which attenuates lipid peroxidation of glomerular tissue.

Animals↗

Providing services to families of persons with schizophrenia: present and future.

BACKGROUND: The important role of families and other caregivers in the lives of adults with schizophrenia is well documented. Persons with schizophrenia frequently live with their families of origin, and the vast majority have regular family contact. Families of persons with schizophrenia have also been demonstrated to have significant needs. Families most frequently cite the need for education and support in helping them to cope with their family member's illness. Further, numerous studies have documented the benefits of interventions designed to meet the needs of family members. AIMS OF THE STUDY: This paper identifies critical issues and challenges in the provision of services to families of persons with schizophrenia and other serious and persistent mental illnesses. METHODS: This study draws from both a literature review and a summary of pertinent data from the Schizophrenia Patient Outcomes Research Team (PORT). RESULTS: Recent best practices standards and treatment recommendations specify that families should be given education and support. One of the PORT treatment recommendations states that "Patients who have on-going contact with their families should be offered a family psychosocial intervention which spans at least nine months and which provides combinations of: Education about the illness; Family support; Crisis intervention; and, Problem solving skills training". The PORT treatment recommendations are based on well designed and rigorous research on family psychoeducation programs that demonstrate reduced relapse rates and improved patient and family well-being for persons whose families receive psychoeducation. While family psychoeducation programs have been the subject of extensive treatment trials, family members and family organizations have endorsed a variety of other models of services such as family education and consultation models. These models have not been as rigorously researched as family psychoeducation. Control groups are generally lacking. No consistent findings have been reported, although isolated studies have found increased knowledge, self-efficacy and greater satisfaction with treatment among families who have participated in family education programs. Remarkably little is known about the extent to which families actually receive appropriate services. However, PORT data from administrative claims and client interviews suggest that family services are minimal. Further, previous research has consistently revealed that families have high levels of dissatisfaction with mental health services DISCUSSION: If family psychoeducation is effective, why do all the data suggest that it is scarcely offered? Even use of family education programs, which are perhaps easier to deliver and cheapter, is limited. Some answers to these questions may be found in evaluations of efforts to disseminate family education and psychoeducation models. The Schizophrenia PORT sponsored a dissemination of William McFarlane's multiple family psychoeducational group. One obstacle to implementation was lack of programmatic leadership at agencies. Another was conflict between the philosophy and principles of the family model and typical agency practices. Dissemination efforts of the MFPG model are under way in the states of Illinois and Maine. IMPLICATIONS FOR FURTHER RESEARCH: Four main areas of research are necessary to achieve progress in providing services to families and persons with serious and persistent brain diseases such as schizophrenia. (i) We need a better understanding of the current state of affairs, including systematic exploration of what kinds of service different kinds of family are receiving or not receiving and from whom. Research on treated populations is not sufficient. Billing records alone will not account for the informal clinician/family contacts, which are valued. This research must include the patient, family and clinician perspectives as well as incorporating systemic factors such as financing and organization of services. (ii) A second area of research should focus on family interventions. What works for whom and at what cost? What are the critical ingredients of successful family models? Peer-led community family education programs are severely under-researched. While psychoeducation has established efficacy, it may have maximal value in first-break patients. How can the acceptability of psychoeducation to families and clinicians be maximized? Are there ways to capitalize on the best of clinician-run and family-run models to create hybrid models? Does family psychoeducation shift costs toward or away from families? (iii) How can successful family services models be disseminated effectively? Although it is still necessary to know more about the current status of services to families, it is quite clear that the best researched psychoeducation programs have limited, if any, penetration in typical communities. Approaches that combine grassroots participation of clinicians and family members as well as efforts with senior administrators and payers are likely to yield the greatest success. (iv) More research is necessary on the role of families and other caregivers in recovery and course of illness. This research must be driven by an appreciation of the biopsychosocial model and be empirical rather than ideological. Such an approach will optimally protect families fn5 from their own tendency to self-blame and from the tendency of the medical models prevalent in industrialized countries to find blame, fault and pathology.

Journal Article↗

Single- and double-cubane clusters in the multiple oxidation states [VFe(3)S(4)](3+,2+,1+).

A new series of cubane-type [VFe(3)S(4)](z)() clusters (z = 1+, 2+, 3+) has been prepared as possible precursor species for clusters related to those present in vanadium-containing nitrogenase. Treatment of [(HBpz(3))VFe(3)S(4)Cl(3)](2)(-) (2, z = 2+), protected from further reaction at the vanadium site by the tris(pyrazolyl)hydroborate ligand, with ferrocenium ion affords the oxidized cluster [(HBpz(3))VFe(3)S(4)Cl(3)](1)(-) (3, z = 3+). Reaction of 2 with Et(3)P results in chloride substitution to give [(HBpz(3))VFe(3)S(4)(PEt(3))(3)](1+) (4, z = 2+). Reaction of 4 with cobaltocene reduced the cluster with formation of the edge-bridged double-cubane [(HBpz(3))(2)V(2)Fe(6)S(8)(PEt(3))(4)] (5, z = 1+, 1+), which with excess chloride underwent ligand substitution to afford [(HBpz(3))(2)V(2)Fe(6)S(8)Cl(4)](4)(-) (6, z = 1+, 1+). X-ray structures of (Me(4)N)[3], [4](PF(6)), 5, and (Et(4)N)(4)[6] x 2MeCN are described. Cluster 5 is isostructural with previously reported [(Cl(4)cat)(2)(Et(3)P)(2)Mo(2)Fe(6)S(8)(PEt(3))(4)] and contains two VFe(3)S(4) cubanes connected across edges by a Fe(2)S(2) rhomb in which the bridging Fe-S distances are shorter than intracubane Fe-S distances. Mössbauer (2-5), magnetic (2-5), and EPR (2, 4) data are reported and demonstrate an S = 3/2 ground state for 2 and 4 and a diamagnetic ground state for 3. Analysis of (57)Fe isomer shifts based on an empirical correlation between shift and oxidation state and appropriate reference shifts results in two conclusions. (i) The oxidation 2 --> 3 + e(-) results in a change in electron density localized largely or completely on the Fe(3) subcluster and associated sulfur atoms. (ii) The most appropriate charge distributions are [V(3+)Fe(3+)Fe(2+)(2)S(4)](2+) (Fe(2.33+)) for 1, 2, and 4 and [V(3+)Fe(3+)(2)Fe(2+)S(4)](3+) (Fe(2.67+)) for 3 and [V(2)Fe(6)S(8)(SEt)(9)](3+). Conclusion i applies to every MFe(3)S(4) cubane-type cluster thus far examined in different redox states at parity of cluster ligation. The formalistic charge distributions are regarded as the best current approximations to electron distributions in these delocalized species. The isomer shifts require that iron atoms are mixed-valence in each cluster.

Catalysis↗

The rat Apg3p/Aut1p homolog is upregulated by ischemic preconditioning in the retina.

PURPOSE: Retinas can be protected from subsequent severe ischemic injury by ischemic preconditioning. Ischemic preconditioning is dependent on gene expression and protein synthesis; however, it is not clear which genes are important in this process. In this study, we have identified and characterized the rat homolog of yeast Apg3p/Aut1p, an important autophagy protein encoded by the autophagy 3-like (APG3L) gene. We have also further characterized the homologous human APG3L gene. METHODS: A fragment of the rat Apg3 cDNA was identified by mRNA differential display from hypoxia-treated E1A-NR3, an immortalized cell line derived from rat retinal cells that manifests phenotypes of retinal neurons. The full length of rat Apg3 (rApg3) cDNA sequence (about 1.4 kb) encoding 341 amino acids was cloned from a rat retinal cDNA library and characterized using Southern and northern blot analysis, and a global GenBank search. Protein expression was determined by western blotting, and immunohistochemistry. Ischemic preconditioning was achieved by ligation of the retinal arteries of the right eye for 5 min followed by 5 h reperfusion. The prolonged retinal ischemia was induced by ligation of the retinal arteries for 45 min followed by 5 h reperfusion. The full-length homologous human APG3L gene was cloned and sequenced from a human genomic DNA library. RESULTS: The combination of genomic Southern blot analysis and a global GenBank search indicated that rat APG3L is a single copy gene. Rat Apg3 mRNA is expressed in the retina at a high level but is also detected in other tissues. In the process of comparing the rat and human APG3L genes we showed that the organization of the human APG3L gene includes a unique transcriptional start site, a coding region with 12 translated exons and 11 introns and is located on human chromosome 3q13.1. Subcellular localization studies showed that recombinant rat autophagocytosis protein (Apg3p) is a cytosolic protein. Rat Apg3 mRNA level was upregulated by ischemic preconditioning but downregulated by prolonged ischemia. CONCLUSIONS: Our results suggest that the upregulation of rApg3 is a specific response to ischemic preconditioning rather than to retina ischemia, and autophagy may contribute to the neuroprotective effect of ischemic preconditioning in the retina.

Amino Acid Sequence↗