Philip J. Johnson
Professor - Equine Medicine and Surgery

· BVSc (with honors) University of Bristol, United Kingdom
· MS (Veterinary Clinical Medicine), University of Illinois, Urbana, IL

Board Certification
· MRCVS (Member of the Royal College of Veterinary Surgeons)
· Diplomate, American College of Veterinary Internal Medicine (ACVIM) (Large Animal Internal Medicine)

JohnsonPJ@missouri.edu

Research emphasis:

Research projects have focused upon investigations into the pathogenesis of equine laminitis ("founder"), especially looking at endocrinological factors. Other research is centered in the pathogenesis, treatment, and prevention of equine obesity and related health issues.

Selected publications:

Eades SC, Stokes AM, Johnson PJ, LeBlanc CJ, Ganjam VK, Buff PR, Moore RM.  Serial alterations in digital hemodynamics and endothelin-1 immunoreactivity, platelet-neutrophil aggregation, and concentrations of nitric oxide, insulin, and glucose in blood obtained from horses following carbohydrate overload.  Am J Vet Res 2007; 68(1):87-94.  [Abstract]

Buff PR, Messer NT 4th, Cogswell AM, Wilson DA, Johnson PJ, Keisler DH, Ganjam VK.  Induction of pulsatile secretion of leptin in horses following thyroidectomy.  J Endocrinol.  2007; 192(2):353-59.   [Abstract]

Buff PR, Messer NT 4th, Cogswell AM, Johnson PJ, Keisler DH, Ganjam VK. Seasonal and pulsatile dynamics of thyrotropin and leptin in mares maintained under a constant energy balance.  Domest Anim Endocrinol 2007; 33(4):430-36 [Abstract]

LaCarrubba AM, Johnson PJ, Whitney MS, Miller MA, Lattimer JC.   Hypoglycemia and tumor lysis syndrome associated with peritoneal mesothelioma in a horse. J Vet Intern Med. 2006; 20(4):1018-22.  [Abstract]

Buff PR, Johnson PJ, Wiedmeyer CE, Ganjam VK, Messer Iv NT, Keisler DH.  Modulation of leptin, insulin, and growth hormone in obese pony mares under chronic nutritional restriction and supplementation with ractopamine hydrochloride.  Vet Ther. 2006; 7(1):64-72.  [Abstract]

Johnson PJ, Scotty NC, Wiedmeyer C, Messer NT, Kreeger JM.  Diabetes mellitus in a domesticated Spanish mustang.
J Am Vet Med Assoc 2005; 226(4):584-88, 542.  [Abstract]

Johnson PJ, Ganjam VK, Kreeger JM, Messer NT.  Tissue specific dysregulation of cortisol metabolism in equine laminitis.  Equine Vet J 2004; 36(1):41-45. [Abstract]

Marsh AE, Lakritz J, Johnson PJ, Miller MA, Chiang YW, Chu HJ.  Evaluation of immune responses in horses immunized using a killed Sarcocystis neurona vaccine.  Vet Therap 2004; 5(1):34-42. [Abstract]

Johnson PJ, Messer NT, Ganjam VK.  Cushing's syndromes, insulin resistance and endocrinopathic laminitis.
Equine Vet J 2004; 36(3):194-98.  [Abstract]

Scotty NC, Ford M, Williams F, Loiacono C, Johnson PJ, Messer NT, Turnquist SE, Essman S.  Exophthalmia associated with paranasal sinus osteoma in a Quarterhorse mare.  J Vet Diagn Invest 2004;16(2):155-60. [Abstract]

Miller MA, Kottler SJ, Ramos-Vara JA, Johnson PJ, Ganjam VK, Evans TJ.  3-methylindole induces transient olfactory mucosal injury in ponies.  Vet Pathol 2003; 40(4):363-70. [Abstract]

Johnson PJ, Messer NT 4th, Ganjam VK, Thompson DL Jr, Refsal KR, Loch WE, Ellersieck MR.  Effects of propylthiouracil and bromocryptine on serum concentrations of thyrotrophin and thyroid hormones in normal female horses. Equine Vet J. 2003; 35(3):296-301.  [Abstract]

Wiedmeyer CE, Johnson PJ, Cohn LA, Meadows RL.  Evaluation of a continuous glucose monitoring system for use in dogs, cats, and horses. J Am Vet Med Assoc 2003; 223(7):987-92.  [Abstract]

Johnson PJ.  The equine metabolic syndrome (“Peripheral Cushing’s Syndrome”). Vet Clin N. Amer:  Equine Pract 2002, vol 18, pp. 271-293.

Johnson PJ, Slight SH, Ganjam VK, Kreeger JM.  Glucocorticoids and laminitis in the horse. Vet Clin N. Amer:  Equine Pract 2002; 18(2):219-36.  [Abstract]

Johnson PJ, Kreeger JM, Keeler M, Ganjam VK, Messer NT.  Serum markers of lamellar basement membrane degradation in horses affected with laminitis.  Equine Vet J 2000; 32(6):462-68 .  [Abstract]  

Katwa LC, Johnson PJ, Ganjam VK, Kreeger JM, Messer NT.  Expression of endothelin in equine laminitis. Equine Vet J 1999; 31(3):243-47.  [Abstract]

Johnson PJ, Tyagi SC, Katwa LC, Ganjam VK, Moore LA, Kreeger JM.  Activation of extracellular matrix metalloproteinases in equine laminitis.  Vet Rec 1998; 142(15):392-96.  [Abstract]

Thayer JF, Hahn AW, Pearson MA, Sollers JJ, Johnson PJ, Lock WE.  Heart rate variability during exercise in the horse. Biomed Sci Instrum 1998; 34:246-51.  [Abstract]

Johnson PJ, Johnson GC, Pace LW.  Thoracic vertebral malformation in two horses.  Equine Vet J 1997; 29(6):493-96.  [Abstract]

Cogswell AM, Johnson PJ, Adams HR.  Evidence for endothelium-derived relaxing factor/nitric oxide in equine digital arteries. Am J Vet Res 1995; 56(12):1637-41.  [Abstract]

Johnson PJ, Geotz TE, Foreman JH, Vogel RS, Hoffman WE, Baker GJ.  Effect of whole-body potassium depletion on plasma, erythrocyte and middle gluteal muscle potassium concentration of healthy adult horses. Am J Vet Res 1991; 52(10):1676-83.  [Abstract]

Holland CJ, Ristic M, Cole AI, Johnson PJ, Baker GJ, Goetz TE.   Isolation, experimental transmission and characterization of the causative agent of Potomac Horse Fever.  Science 1985; 227(4686):522-24.  [Abstract]