preparation-culture-myogenic-precursor-cellsprimary-myoblasts-from

Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans

Skeletal muscle homeostasis depends on muscle growth (hypertrophy), atrophy and regeneration. During ageing and in several diseases, muscle wasting ...

University of Liverpool

Aintree University Hospital

This review article discusses the pathologic and anatomic basis of rheumatoid lesser toe deformities. It covers the history of lesser metatarsal head resection being used in its treatment and the theoretic basis behind differing techniques and their relative results and complications. The authors also present their preferred technique for lesser metatarsal head resection.

Surgery of the lesser toes in rheumatoid arthritis: metatarsal head resection.

The treatment of noninsertional Achilles tendinopathy remains, to a large extent, empirical. Neither different operative techniques nor nonoperative regimes have been subjected to controlled trials. Rather, the condition is still treated on the basis of anecdotal evidence combined with personal experience. However, increased knowledge of the basic science of tendinopathy and tendon healing has directed therapeutic regimens and will continue to do so. Manipulation of proteolytic enzymes and control of neovascularization are probably the two areas that show most promise.

Noninsertional Achilles tendinopathy.

Treatment of the arthritic varus ankle presents a significant surgical challenge. The recognition of the causes and associated deformities directs the treatment of the individual patient and optimizes functional outcome. Arthrodesis and total ankle replacement often will need to be augmented by corrective hind- and midfoot procedures and by careful soft tissue balancing. Often multiple procedures are required to achieve the desired result, and patients need to be advised that surgery may need to be staged.

Management of the varus arthritic ankle.

The use of single-photon-emission computed tomography (SPECT) in identifying unexplained pain in the foot and ankle has been described, where other imaging modalities have failed. The investigation of a painful total ankle replacement (TAR) is difficult, often not delineating a definitive cause. Our aim in this study was to investigate the use of SPECT-CT imaging in painful TARs.

Single-photon-emission computed tomography in painful total ankle replacements.

A turf toe injury encompasses a wide spectrum of traumatic problems that occur to the first metatarsophalangeal joint. Most of these injuries are mild and respond well to nonoperative management. However, more severe injuries may require surgical management, including presence of diastasis or retraction of sesamoids, vertical instability, traumatic hallux valgus deformity, chondral injury, loose body, and failed conservative treatment.

Turf Toe and Disorders of the Sesamoid Complex.

Response to "Letter Regarding: Single-Photon-Emission Computed Tomography in Painful Total Ankle Replacements".

A common characteristic of aging is defective regeneration of skeletal muscle. The molecular pathways underlying age-related decline in muscle regenerative potential remain elusive. microRNAs are novel gene regulators controlling development and homeostasis and the regeneration of most tissues, including skeletal muscle. Here, we use satellite cells and primary myoblasts from mice and humans and an in vitro regeneration model, to show that disrupted expression of microRNA-143-3p and its target gene, Igfbp5, plays an important role in muscle regeneration in vitro. We identified miR-143 as a regulator of the insulin growth factor-binding protein 5 (Igfbp5) in primary myoblasts and show that the expression of miR-143 and its target gene is disrupted in satellite cells from old mice. Moreover, we show that downregulation of miR-143 during aging may act as a compensatory mechanism aiming at improving myogenesis efficiency; however, concomitant upregulation of miR-143 target gene, Igfbp5, is associated with increased cell senescence, thus affecting myogenesis. Our data demonstrate that dysregulation of miR-143-3p:Igfbp5 interactions in satellite cells with age may be responsible for age-related changes in satellite cell function.

Andrew P. Molloy

Institute of Ageing and Chronic Disease

University of Liverpool

Preparation and Culture of Myogenic Precursor Cells/Primary Myoblasts from Skeletal Muscle of Adult and Aged Humans