RESUMO
The surgical treatment of hernias has developed throughout the evolution of surgery. The fascination with hernia surgery is in part driven by its prevalence and by the variety of treatment options. Minimally invasive hernia surgery has a goal of a robust repair with minimal complications, and new robotic techniques are being developed in complex abdominal wall hernias with promising results. This review focuses on inguinal, ventral, and incisional hernias and their outcomes with a discussion on the traditional open, laparoscopic, and robotic techniques. The prevalence of minimally invasive hernia surgery and its advantages are also outlined. We highlight our experience in these procedures, specifically robotic herniorrhaphy, as it pertains to ventral incisional and inguinal hernia repair. We conclude that the robotic platform is proving to be a benefit to hernia repair. Many studies are showing its feasibility and comparable results to standard laparoscopy, and some have shown improved results, including shorter hospital stay without significant increases in cost. The robotic option of hernia repair has resulted in an increase in minimally invasive hernia repair, a number that has remained stagnant for the last decade. With more surgeons gaining training and experience and greater availability of the robotic platform, we expect to see greater numbers of minimally invasive hernia repair.
RESUMO
Intracellular and intercellular polarity requires that specific proteins be sorted to discreet locations within and between cells. One mechanism for sorting proteins is through RNA localization. In Saccharomyces cerevisiae, ASH1 mRNA localizes to the distal tip of the bud, resulting in the asymmetric sorting of the transcriptional repressor Ash1p. ASH1 mRNA localization requires four cis-acting localization elements and the trans-acting factors Myo4p, She3p, and She2p. Myo4p is a type V myosin motor that functions to directly transport ASH1 mRNA to the bud. She2p is an RNA-binding protein that directly interacts with the ASH1 mRNA cis-acting elements. Currently, the role for She3p in ASH1 mRNA localization is as an adaptor protein, since it can simultaneously associate with Myo4p and She2p. Here, we present data for two novel mutants of She3p, S348E and the double mutant S343E S361E, that are defective for ASH1 mRNA localization, and yet both of these mutants retain the ability to associate with Myo4p and She2p. These observations suggest that She3p possesses a novel activity required for ASH1 mRNA localization, and our data imply that this function is related to the ability of She3p to associate with ASH1 mRNA. Interestingly, we determined that She3p is phosphorylated, and global mass spectrometry approaches have determined that Ser 343, 348, and 361 are sites of phosphorylation, suggesting that the novel function for She3p could be negatively regulated by phosphorylation. The present study reveals that the current accepted model for ASH1 mRNA localization does not fully account for the function of She3p in ASH1 mRNA localization.
Assuntos
Transporte de RNA/genética , RNA Mensageiro/metabolismo , Proteínas de Ligação a RNA/metabolismo , Proteínas Repressoras/biossíntese , Proteínas de Saccharomyces cerevisiae/biossíntese , Proteínas de Saccharomyces cerevisiae/metabolismo , Saccharomyces cerevisiae/metabolismo , Transporte Biológico/genética , Domínio Catalítico/genética , Polaridade Celular/genética , Citoplasma/genética , Citoplasma/metabolismo , Regulação Fúngica da Expressão Gênica/genética , Espectrometria de Massas , Mutação/genética , Cadeias Pesadas de Miosina/genética , Cadeias Pesadas de Miosina/metabolismo , Miosina Tipo V/genética , Miosina Tipo V/metabolismo , Proteínas Nucleares/genética , Proteínas Nucleares/metabolismo , Fosforilação , Ligação Proteica/genética , Biossíntese de Proteínas/fisiologia , Transporte Proteico/genética , RNA Mensageiro/genética , Proteínas de Ligação a RNA/genética , Elementos Reguladores de Transcrição/fisiologia , Proteínas Repressoras/genética , Proteínas Repressoras/metabolismo , Saccharomyces cerevisiae/genética , Proteínas de Saccharomyces cerevisiae/genética , Transativadores/genética , Transativadores/metabolismo , Ativação TranscricionalRESUMO
Many mitochondrial proteins are encoded by nuclear genes and after translation in the cytoplasm are imported via translocases in the outer and inner membranes, the TOM and TIM complexes, respectively. Here, we report the characterization of the mitochondrial protein, Mmp37p (YGR046w) and demonstrate its involvement in the process of protein import into mitochondria. Haploid cells deleted of MMP37 are viable but display a temperature-sensitive growth phenotype and are inviable in the absence of mitochondrial DNA. Mmp37p is located in the mitochondrial matrix where it is peripherally associated with the inner membrane. We show that Mmp37p has a role in the translocation of proteins across the mitochondrial inner membrane via the TIM23-PAM complex and further demonstrate that substrates containing a tightly folded domain in close proximity to their mitochondrial targeting sequences display a particular dependency on Mmp37p for mitochondrial import. Prior unfolding of the preprotein, or extension of the region between the targeting signal and the tightly folded domain, relieves their dependency for Mmp37p. Furthermore, evidence is presented to show that Mmp37 may affect the assembly state of the TIM23 complex. On the basis of these findings, we hypothesize that the presence of Mmp37p enhances the early stages of the TIM23 matrix import pathway to ensure engagement of incoming preproteins with the mtHsp70p/PAM complex, a step that is necessary to drive the unfolding and complete translocation of the preprotein into the matrix.
