Schwann cell transplantation improves reticulospinal axon growth and forelimb strength after severe cervical spinal cord contusion

Schwann cell (SC) implantation alone has been shown to promote the growth of propriospinal and sensory axons, but not long-tract descending axons, after thoracic spinal cord injury (SCI). In the current study, we examined if an axotomy close to the cell body of origin (so as to enhance the intrinsic growth response) could permit supraspinal axons to grow onto SC grafts. Adult female Fischer rats received a severe (C5) cervical contusion (1.1 mm displacement, 3 KDyn). At 1 week postinjury, 2 million SCs ex vivo transduced with lentiviral vector encoding enhanced green fluorescent protein (EGFP) were implanted within media into the injury epicenter; injury-only animals served as controls. Animals were tested weekly using the BBB score for 7 weeks postimplantation and received at end point tests for upper body strength: self-supported forelimb hanging, forearm grip force, and the incline plane. Following behavioral assessment, animals were anterogradely traced bilaterally from the reticular formation using BDA-Texas Red. Stereological quantification revealed a twofold increase in the numbers of preserved NeuN+ neurons rostral and caudal to the injury/graft site in SC implanted animals, corroborating previous reports of their neuroprotective efficacy. Examination of labeled reticulospinal axon growth revealed that while rarely an axon was present within the lesion site of injury-only controls, numerous reticulospinal axons had penetrated the SC implant/lesion milieu. This has not been observed following implantation of SCs alone into the injured thoracic spinal cord. Significant behavioral improvements over injury-only controls in upper limb strength, including an enhanced grip strength (a 296% increase) and an increased self-supported forelimb hanging, accompanied SC-mediated neuroprotection and reticulospinal axon growth. The current study further supports the neuroprotective efficacy of SC implants after SCI and demonstrates that SCs alone are capable of supporting modest supraspinal axon growth when the site of axon injury is closer to the cell body of the axotomized neuron.     

Awareness and Attitude of University Students About Screening and Testing for Hemoglobinopathies: Case Study of the Aseer Region,Saudi Arabia

Abstract

Hemoglobinopathies can disturb a patient’s life style leading to community problems. Premarital screening is an important tool to control and minimize hemoglobinopathies. This study aimed to assess and improve the awareness and attitude of King Khalid University (KKU) [Abha, Kingdom of Saudi Arabia (KSA)] students in the Aseer Region, regarding hemoglobinopathies and the National Premarital Screening Programme (NPMS) in addition to screening for hemoglobin (Hb) variants of students who agreed to participate. This study was an interventional educational prospective study of electronic-lectures (e-lectures) that addressed some important issues of hemoglobinopathies and premarital screening. Six hundred and eleven students were interviewed during the academic year 2017/2018, using closed-ended questionnaires that distributed before and after intervention. Blood samples were taken from 114 students who agreed to check their Hb type by the D-10 Hemoglobin Testing System. The results revealed significant changes in knowledge and attitude of students toward hemoglobinopathies and premarital counseling after intervention. These results reflected the need for easily accessible and continuous health education programs for students to increase their awareness and attitude toward hemoglobinopathies. Laboratory results for 114 students revealed seven cases with microcytic hypochromic anemia (6.1%); they were all females. Blood screening for Hb variants revealed another two females (1.75%) with sickle cell trait (Hb AS). Electronic-health (E-health) is an efficient tool for improving the awareness and attitude of the community toward hemoglobinopathies. Screening blood tests for detection of hemoglobinopathies should be provided to young adults at an earlier stage (before marriage) to decrease the incidence of hereditary diseases in the community.     

Effect of chlorine dioxide gas on Salmonella enterica inoculated on navel orange surfaces and its impact on the quality attributes of treated oranges

Microorganisms, including pathogens of public health significance, have been shown to contaminate orange juice during the mechanical extraction of juice. The problem gets exacerbated when washed oranges have high initial microbial load, due to an insufficient postharvest treatment. The objective of this study was to investigate the reduction of Salmonella enterica on orange surfaces using ClO? gas treatments to achieve a 5 log reduction, consistent with the recommendations of the U.S. Department of Agriculture-National Advisory Committee on Microbiological Criteria for Foods. A mixed culture of four Salmonella strains, isolated from previous orange juice outbreaks, was spot inoculated onto orange skin surface areas. The oranges were then treated with 0.1, 0.3, and 0.5 mg/L ClO? gas for 2-14 minutes at 22°C and 90%-95% relative humidity. Surviving bacteria on treated areas were recovered and enumerated over treatment time on a nonselective medium, tryptic soy agar, followed by culturing onto a selective medium, xylose lysine deoxycholate agar. A >5 log reduction of Salmonella per sample of orange surface was observed with 0.1 and 0.3 mg/L ClO? gas treatments at 14 minutes and a similar log reduction was observed at 0.5 mg/L ClO? gas at 10 minutes. This result demonstrates that the treatment of oranges with ClO? gas is a promising technology that could be successfully employed for the treatment of whole oranges to reduce the risk of Salmonella outbreaks in orange juice.     

Thyroid hormone enhances transected axonal regeneration and muscle reinnervation following rat sciatic nerve injury

Improvement of nerve regeneration and functional recovery following nerve injury is a challenging problem in clinical research. We have already shown that following rat sciatic nerve transection, the local administration of triiodothyronine (T3) significantly increased the number and the myelination of regenerated axons. Functional recovery is a sum of the number of regenerated axons and reinnervation of denervated peripheral targets. In the present study, we investigated whether the increased number of regenerated axons by T3‐treatment is linked to improved reinnervation of hind limb muscles. After transection of rat sciatic nerves, silicone or biodegradable nerve guides were implanted and filled with either T3 or phosphate buffer solution (PBS). Neuromuscular junctions (NMJs) were analyzed on gastrocnemius and plantar muscle sections stained with rhodamine α‐bungarotoxin and neurofilament antibody. Four weeks after surgery, most end‐plates (EPs) of operated limbs were still denervated and no effect of T3 on muscle reinnervation was detected at this stage of nerve repair. In contrast, after 14 weeks of nerve regeneration, T3 clearly enhanced the reinnervation of gastrocnemius and plantar EPs, demonstrated by significantly higher recovery of size and shape complexity of reinnervated EPs and also by increased acetylcholine receptor (AChRs) density on post synaptic membranes compared to PBS‐treated EPs. The stimulating effect of T3 on EP reinnervation is confirmed by a higher index of compound muscle action potentials recorded in gastrocnemius muscles. In conclusion, our results provide for the first time strong evidence that T3 enhances the restoration of NMJ structure and improves synaptic transmission. © 2010 Wiley‐Liss, Inc.     

循环脂联素:肝细胞癌的一种潜在预后指标(英文)

Objective  

We planned this study to investigate the relation between serum adiponectin level and hepatocellular carcinoma (HCC): risk, features and prognosis.