Christopher K Livingston

University of Texas Health Science Center at Houston, Houston, Texas, United States

Are you Christopher K Livingston?

Claim your profile

Publications (4)10.22 Total impact

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Increased levels of genes in the type I interferon (IFN) pathway have been observed in patients with systemic sclerosis (SSc), or scleroderma. How type I IFN regulates the dermal fibroblast and its participation in the development of dermal fibrosis is not known. We hypothesized that one mechanism by which type I IFN may contribute to dermal fibrosis is through upregulation of specific Toll-like receptors (TLRs) on dermal fibroblasts. Therefore, we investigated the regulation of TLR expression on dermal fibroblasts by IFN. The expression of TLRs was assessed in cultured dermal fibroblasts from control and SSc patients stimulated with IFNα2. The ability of IFNα2 to regulate TLR-induced interleukin (IL)-6 and CC chemokine ligand 2 production was also assessed. Immunohistochemical analyses were performed to determine whether TLR3 was expressed in skin biopsies in the bleomycin-induced skin fibrosis model and in patients with SSc. IFNα2 increased TLR3 expression on human dermal fibroblasts, which resulted in enhanced TLR3-induced IL-6 production. SSc fibroblasts have an augmented TLR3 response to IFNα2 relative to control fibroblasts. Pretreatment of fibroblasts with transforming growth factor (TGF)-β increased TLR3 induction by IFNα2, but coincubation of TGF-β did not alter TLR3 induction by IFN. Furthermore, IFNα2 inhibits but does not completely block the induction of connective tissue growth factor and collagen expression by TGF-βin fibroblasts. TLR3 expression was observed in dermal fibroblasts and inflammatory cells from skin biopsies from patients with SSc as well as in the bleomycin-induced skin fibrosis model. Type I IFNs can increase the inflammatory potential of dermal fibroblasts through the upregulation of TLR3.
    Arthritis research & therapy 01/2011; 13(1):R3. DOI:10.1186/ar3221 · 4.12 Impact Factor
  • Mitchell Flurry · Emmanuel G Melissinos · Christopher K Livingston
    [Show abstract] [Hide abstract]
    ABSTRACT: Replantation of traumatic upper arm amputations are usually contraindicated due to patient age, comorbid diseases, ischemia time, and/or avulsion of proximal structures. Stable soft tissue coverage preserving proximal stump length and critical joints is required to prevent loss of limb function and aid in prosthetic fitting and comfort. The use of free fillet flaps from the amputated limb is well documented for lower-extremity amputations but has only recently been reported for upper-arm amputations involving distal humeral or elbow wounds or following radical upper-arm tumor resections. Furthermore, these described free fillet flaps were fasciocutaneous rather than composite flaps. Composite free fillet flaps from the amputated upper arm utilizing the flexor muscles adjacent to the vascular pedicles is not well described or documented. Eight upper-extremity, composite, free fillet flaps were performed to cover proximal humeral and shoulder defects secondary to upper-arm traumatic amputation from July 1995 to May 2005 on 7 males and 1 female. A retrospective chart review was completed, and information collected included the age of patient, gender, date of injury and surgery, amputation site, mechanism of injury, ischemia time, type of fillet flap, donor and recipient vessels, flap sensation, flap survival, and number of complications. All upper-arm amputations were trauma related (100%) and secondary to industrial accidents (4), motor vehicle and motorcycle accidents (2), fall (1), and train (1). Patient age ranged from 16 to 62 years and polytrauma was noted in 50%. Procedures included 6 composite free fillet flaps and 2 radial forearm free fillet flaps, with 4 (50%) sensate. Sensory nerves included the medial (3) and lateral (2) antebrachial cutaneous nerves attached to median proximal nerve stumps. Ischemia time ranged from 280 to 630 minutes. All flaps survived and 2 (25%) complications occurred in 1 patient. Subjective and protective sensation was observed in each neurorrhaphy; however, no confirmatory tested was used. Immediate soft tissue coverage using composite free fillet flaps from amputated limbs can be successful, with few complications, and preserves limb length while maximizing available tissue. Furthermore, including flexor muscle belly adjacent to the vascular pedicles provides additional coverage and a well-vascularized composite flap to aid in prosthetic fitting and comfort.
    Annals of Plastic Surgery 05/2008; 60(4):391-4. DOI:10.1097/SAP.0b013e31811ffe82 · 1.46 Impact Factor
  • Source
    Nicholas Stephens · Eric Marques · Christopher Livingston
    [Show abstract] [Hide abstract]
    ABSTRACT: Anomalies of the flexor digitorum superficialis muscle are extremely uncommon and usually present as a painful mass or pseudotumour within the palm. Diagnosis may be difficult because many other soft tissue tumours (lipomas, ganglions, giant cell tumours and hamartomas) may present similarly. Magnetic resonance imaging helps to define the extent and characteristics of this anomalous muscle belly and to distinguish it from a soft tissue sarcoma, whereas plain radiographs are of little value. Three types of flexor digitorum superficialis muscle anomalies have been described, and treatment consists of subtotal or total surgical debulking of the mass if symptoms persist or if the diagnosis is in question. Most patients have complete resolution and full recovery. To date, 20 cases have been reported in the literature, usually involving the right small finger. In the present paper, the case of an anomalous flexor digitorum superficialis muscle in a 17-year-old male patient's left index finger is reported. Symptoms were relieved following surgical debulking and hand-based occupational therapy.
    The Canadian journal of plastic surgery, Journal canadien de chirurgie plastique 02/2007; 15(1):44-6. · 0.27 Impact Factor
  • Alex C Vidaeff · Patti J Ross · Christopher K Livingston · Donald H Parks
    [Show abstract] [Hide abstract]
    ABSTRACT: Gigantomastia is a rare and dangerous condition in pregnancy. Although improvement after delivery is likely, postpartum aggravation is possible. To date, various pharmacological approaches have been tried, with only marginal effectiveness. Surgical intervention is often necessary. A young woman presented at 32 weeks' gestation with mirror syndrome and gigantomastia. Two years earlier she had had reduction mammoplasty by free nipple transplant. She delivered by cesarean. Rapid postpartum progression of gigantomastia led to breast necrosis and sepsis. The clinical course was complicated by acute respiratory distress syndrome and renal failure. Emergent bilateral simple mastectomy was performed, with subsequent clinical improvement. When this devastating condition occurs in pregnancy or postpartum, urgent surgical intervention may prevent potentially fatal complications.
    Obstetrics and Gynecology 06/2003; 101(5 Pt 2):1139-42. DOI:10.1016/S0029-7844(03)00061-9 · 4.37 Impact Factor

Publication Stats

53 Citations
10.22 Total Impact Points

Institutions

  • 2007–2011
    • University of Texas Health Science Center at Houston
      • Division of Plastic and Reconstructive Surgery
      Houston, Texas, United States
  • 2008
    • University of Houston
      Houston, Texas, United States