Investigating the Genetic Causes of HCM

Meurs, K.M., et al., Analysis of 8 sarcomeric candidate genes for feline hypertrophic cardiomyopathy mutations in cats with hypertrophic cardiomyopathy. J Vet Intern Med, 2009. 23(4): p. 840-3.

The most common heart disease in cats is hypertrophic cardiomyopathy (HCM). A causative mutation has been identified in two breeds, the Maine Coon (MC) and Ragdoll that involve the cardiac myosin binding protein C gene (MYBPC3). HCM is thought to be inherited in other breeds as well. The objective of the study was to evaluate a subset of cats from additional breeds with HCM including the British Shorthair (BSH), Norwegian Forest Cat (NWF), Siberian, and Sphynx and to also examine MC cats known to be affected with HCM but lacking the known mutation. Fourteen affected cats among these breeds were evaluated. A causative mutation was not identified in the eight candidate genes studied, although several single nucleotide polymorphisms were detected. The study concluded that mutations within these cardiac genes do not appear to be the only cause of HCM in these breeds. Further evaluation of additional cardiac genes is considered warranted. (VT)
>> PubMed Abstract

Related articles:
Meurs, K.M., et al., A substitution mutation in the myosin binding protein C gene in ragdoll hypertrophic cardiomyopathy. Genomics, 2007. 90(2): p. 261-4.
>> PubMed Abstract

Meurs, K., et al., A cardiac myosin binding protein C mutation in the Maine Coon cat with familial hypertrophic cardiomyopathy. Hum Mol Genet, 2005. 14(23): p. 3587-3593.
>> PubMed Abstract

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Meurs, K.M., et al., Analysis of 8 sarcomeric candidate genes for feline hypertrophic cardiomyopathy mutations in cats with hypertrophic cardiomyopathy. J Vet Intern Med, 2009. 23(4): p. 840-3.

The most common heart disease in cats is hypertrophic cardiomyopathy (HCM). A causative mutation has been identified in two breeds, the Maine Coon (MC) and Ragdoll that involve the cardiac myosin binding protein C gene (MYBPC3). HCM is thought to be inherited in other breeds as well. The objective of the study was to evaluate a subset of cats from additional breeds with HCM including the British Shorthair (BSH), Norwegian Forest Cat (NWF), Siberian, and Sphynx and to also examine MC cats known to be affected with HCM but lacking the known mutation. Fourteen affected cats among these breeds were evaluated. A causative mutation was not identified in the eight candidate genes studied, although several single nucleotide polymorphisms were detected. The study concluded that mutations within these cardiac genes do not appear to be the only cause of HCM in these breeds. Further evaluation of additional cardiac genes is considered warranted. (VT)
>> PubMed Abstract

Related articles:
Meurs, K.M., et al., A substitution mutation in the myosin binding protein C gene in ragdoll hypertrophic cardiomyopathy. Genomics, 2007. 90(2): p. 261-4.
>> PubMed Abstract

Meurs, K., et al., A cardiac myosin binding protein C mutation in the Maine Coon cat with familial hypertrophic cardiomyopathy. Hum Mol Genet, 2005. 14(23): p. 3587-3593.
>> PubMed Abstract

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Cats and Dietary Sodium

Xu, H., D.P.L. Laflamme, and G.L. Long, Effects of dietary sodium chloride on health parameters in mature cats. Journal of Feline Medicine & Surgery, 2009. 11(6): p. 435-441.

High sodium diets are often used for cats to increase water intake and urine output, both beneficial goals for treatment of lower urinary tract disease. A study published in 2006 suggested that increased dietary sodium might have adverse effects on the kidneys. The objective of this controlled, prospective study was to evaluate the effect of different salt contents in diets fed to mature cats for a period of 6 months. No adverse effects were noted, including effects on food intake, body weight, hydration, blood pressure, and kidney function. These results are consistent with the majority of other studies which indicate that sodium at 1.5% of the diet (DM) is not harmful to healthy cats. [SL]
>> PubMed Abstract

Related articles:
Kirk, C.A., D.E. Jewell, and S.R. Lowry, Effects of sodium chloride on selected parameters in cats. Vet Ther, 2006. 7(4): p. 333-46.
>> PubMed Abstract

Luckschander, N., et al., Dietary NaCl does not affect blood pressure in healthy cats. J Vet Intern Med, 2004. 18(4): p. 463-467.
>> PubMed Abstract

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Xu, H., D.P.L. Laflamme, and G.L. Long, Effects of dietary sodium chloride on health parameters in mature cats. Journal of Feline Medicine & Surgery, 2009. 11(6): p. 435-441.

High sodium diets are often used for cats to increase water intake and urine output, both beneficial goals for treatment of lower urinary tract disease. A study published in 2006 suggested that increased dietary sodium might have adverse effects on the kidneys. The objective of this controlled, prospective study was to evaluate the effect of different salt contents in diets fed to mature cats for a period of 6 months. No adverse effects were noted, including effects on food intake, body weight, hydration, blood pressure, and kidney function. These results are consistent with the majority of other studies which indicate that sodium at 1.5% of the diet (DM) is not harmful to healthy cats. [SL]
>> PubMed Abstract

Related articles:
Kirk, C.A., D.E. Jewell, and S.R. Lowry, Effects of sodium chloride on selected parameters in cats. Vet Ther, 2006. 7(4): p. 333-46.
>> PubMed Abstract

Luckschander, N., et al., Dietary NaCl does not affect blood pressure in healthy cats. J Vet Intern Med, 2004. 18(4): p. 463-467.
>> PubMed Abstract

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Understanding FIP

Regan, A.D., R.D. Cohen, and G.R. Whittaker, Activation of p38 MAPK by feline infectious peritonitis virus regulates pro-inflammatory cytokine production in primary blood-derived feline mononuclear cells. Virology, 2009. 384(1): p. 135-43.

Feline infectious peritonitis (FIP) is a fatal disease of cats associated with feline coronavirus (FCoV) infection, a common enteric virus of cats. How this virus leads to the lethal disease is not clear, as most infected cats do not develop disease. Cytokines are proteins secreted from cells, including cells of the immune system, that are important in mediating an effective immune response. Cats with FIP have abnormal cytokine production that may contribute to the disease FIP. In this study, the investigators examined the effects of the FIP virus on certain white blood cells collected from cats, in a laboratory environment. These cells are the target of the FCoV in cases of FIP. The investigators showed that an important cellular pathway responsible for inducing inflammation is activated by the virus, and is a key contributor to the disease observed in cats with FIP. The raises the possibility that inhibitors of this pathway may be beneficial in the treatment of FIP. [MK]
>> PubMed Abstract

Related articles:
Takano, T., et al., Neutrophil survival factors (TNF-alpha, GM-CSF, and G-CSF) produced by macrophages in cats infected with feline infectious peritonitis virus contribute to the pathogenesis of granulomatous lesions. Arch Virol, 2009.
>> PubMed Abstract

Giordano, A. and S. Paltrinieri, Interferon-gamma in the serum and effusions of cats with feline coronavirus infection. Vet J, 2009. 180(3): p. 396-8.
>> PubMed Abstract

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Regan, A.D., R.D. Cohen, and G.R. Whittaker, Activation of p38 MAPK by feline infectious peritonitis virus regulates pro-inflammatory cytokine production in primary blood-derived feline mononuclear cells. Virology, 2009. 384(1): p. 135-43.

Feline infectious peritonitis (FIP) is a fatal disease of cats associated with feline coronavirus (FCoV) infection, a common enteric virus of cats. How this virus leads to the lethal disease is not clear, as most infected cats do not develop disease. Cytokines are proteins secreted from cells, including cells of the immune system, that are important in mediating an effective immune response. Cats with FIP have abnormal cytokine production that may contribute to the disease FIP. In this study, the investigators examined the effects of the FIP virus on certain white blood cells collected from cats, in a laboratory environment. These cells are the target of the FCoV in cases of FIP. The investigators showed that an important cellular pathway responsible for inducing inflammation is activated by the virus, and is a key contributor to the disease observed in cats with FIP. The raises the possibility that inhibitors of this pathway may be beneficial in the treatment of FIP. [MK]
>> PubMed Abstract

Related articles:
Takano, T., et al., Neutrophil survival factors (TNF-alpha, GM-CSF, and G-CSF) produced by macrophages in cats infected with feline infectious peritonitis virus contribute to the pathogenesis of granulomatous lesions. Arch Virol, 2009.
>> PubMed Abstract

Giordano, A. and S. Paltrinieri, Interferon-gamma in the serum and effusions of cats with feline coronavirus infection. Vet J, 2009. 180(3): p. 396-8.
>> PubMed Abstract

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Risk Factors for FIV Infection

Murray, J.K., et al., Risk factors for feline immunodeficiency virus antibody test status in Cats Protection adoption centres (2004). Journal of Feline Medicine & Surgery, 2009. 11(6): p. 467-473.

This study determined the prevalence of feline immunodeficiency virus (FIV) within a group of cats entering 10 United Kingdom adoption centres run by Cat Protection. All cats entering the facilities were tested for FIV using a rapid enzyme immunoassay antibody test. The overall prevalence of positive test results was 3.1%, while the prevalence at different adoption centres varied from 0.8% to 6.7%. Male cats were found to be approximately three times more likely than female cats to be FIV positive. The previous history of the cat was also shown to be associated with FIV status, where cats admitted from stray or feral backgrounds were approximately three times more likely to be FIV positive than those cats surrendered by their owners. Cats in poor health were four times more likely to be positive than those with fair to good health. There was no evidence found for an association between neuter status and FIV test results. The study may help adoption centres identify those cats with an increased risk of FIV for routine FIV testing. [VT]
>> PubMed Abstract

Related articles:
Levy, J.K., et al., Seroprevalence of feline leukemia virus and feline immunodeficiency virus infection among cats in North America and risk factors for seropositivity. J Am Vet Med Assoc, 2006. 228(3): p. 371-6.
>> PubMed Abstract

Macieira, D.B., et al., Prevalence and risk factors for hemoplasmas in domestic cats naturally infected with feline immunodeficiency virus and/or feline leukemia virus in Rio de Janeiro - Brazil. J Feline Med Surg, 2008. 10(2): p. 120-9.
>> PubMed Abstract

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Murray, J.K., et al., Risk factors for feline immunodeficiency virus antibody test status in Cats Protection adoption centres (2004). Journal of Feline Medicine & Surgery, 2009. 11(6): p. 467-473.

This study determined the prevalence of feline immunodeficiency virus (FIV) within a group of cats entering 10 United Kingdom adoption centres run by Cat Protection. All cats entering the facilities were tested for FIV using a rapid enzyme immunoassay antibody test. The overall prevalence of positive test results was 3.1%, while the prevalence at different adoption centres varied from 0.8% to 6.7%. Male cats were found to be approximately three times more likely than female cats to be FIV positive. The previous history of the cat was also shown to be associated with FIV status, where cats admitted from stray or feral backgrounds were approximately three times more likely to be FIV positive than those cats surrendered by their owners. Cats in poor health were four times more likely to be positive than those with fair to good health. There was no evidence found for an association between neuter status and FIV test results. The study may help adoption centres identify those cats with an increased risk of FIV for routine FIV testing. [VT]
>> PubMed Abstract

Related articles:
Levy, J.K., et al., Seroprevalence of feline leukemia virus and feline immunodeficiency virus infection among cats in North America and risk factors for seropositivity. J Am Vet Med Assoc, 2006. 228(3): p. 371-6.
>> PubMed Abstract

Macieira, D.B., et al., Prevalence and risk factors for hemoplasmas in domestic cats naturally infected with feline immunodeficiency virus and/or feline leukemia virus in Rio de Janeiro - Brazil. J Feline Med Surg, 2008. 10(2): p. 120-9.
>> PubMed Abstract

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Treatment of Feline Diabetes with Diet and Insulin

Hall, T. D., O. Mahony, et al. (2009). "Effects of diet on glucose control in cats with diabetes mellitus treated with twice daily insulin glargine." Journal of Feline Medicine & Surgery 11(2): 125-130.

Diabetes mellitus is a common feline disease and is treated with a combination of dietary therapy and insulin. Insulin glargine (Lantus, Sanofi-Aventis) is a long-acting recombinant human insulin that is frequently used to treat diabetic cats. The purpose of this study, from Tufts Cummings School of Veterinary Medicine, was to compare a low carbohydrate/high protein (LCHP) diet to a non-prescription control diet in diabetic cats receiving insulin glargine twice daily. Over the 10-week trial, 6 cats were given the LCHP diet (DM Dietetic Management Feline Formula dry & canned, Nestle Purina) and 6 cats were given control diets (Pro Plan Adult Cat total Care Chicken and Rice dry, Nestle Purina and Friskies Special Diet Turkey & Giblets Dinner canned, Nestle Purina). Re-evaluations (blood glucose curves, serum fructosamine, and assessment of clinical signs) were performed at weeks 1, 2, 4, 6, and 10. Using insulin glargine twice daily and frequent monitoring, all cats in both groups did well. The main difference between the two groups was that the cats fed the LCHP diet had significantly lower serum fructosamine levels compared to the cats on the control diets. The clinical significance of this is unknown as all cats in both diet groups achieved good glycemic control. [SL]
>> PubMed Abstract

Related articles:
Marshall, R. D., J. S. Rand, et al. (2008). "Glargine and protamine zinc insulin have a longer duration of action and result in lower mean daily glucose concentrations than lente insulin in healthy cats." J Vet Pharmacol Ther 31(3): 205-212.
>> PubMed Abstract

Rios, L. and C. Ward (2008). "Feline diabetes mellitus: diagnosis, treatment, and monitoring." Compend Contin Educ Vet 30(12): 626-39; quiz 639-40.
>> PubMed Abstract

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Hall, T. D., O. Mahony, et al. (2009). "Effects of diet on glucose control in cats with diabetes mellitus treated with twice daily insulin glargine." Journal of Feline Medicine & Surgery 11(2): 125-130.

Diabetes mellitus is a common feline disease and is treated with a combination of dietary therapy and insulin. Insulin glargine (Lantus, Sanofi-Aventis) is a long-acting recombinant human insulin that is frequently used to treat diabetic cats. The purpose of this study, from Tufts Cummings School of Veterinary Medicine, was to compare a low carbohydrate/high protein (LCHP) diet to a non-prescription control diet in diabetic cats receiving insulin glargine twice daily. Over the 10-week trial, 6 cats were given the LCHP diet (DM Dietetic Management Feline Formula dry & canned, Nestle Purina) and 6 cats were given control diets (Pro Plan Adult Cat total Care Chicken and Rice dry, Nestle Purina and Friskies Special Diet Turkey & Giblets Dinner canned, Nestle Purina). Re-evaluations (blood glucose curves, serum fructosamine, and assessment of clinical signs) were performed at weeks 1, 2, 4, 6, and 10. Using insulin glargine twice daily and frequent monitoring, all cats in both groups did well. The main difference between the two groups was that the cats fed the LCHP diet had significantly lower serum fructosamine levels compared to the cats on the control diets. The clinical significance of this is unknown as all cats in both diet groups achieved good glycemic control. [SL]
>> PubMed Abstract

Related articles:
Marshall, R. D., J. S. Rand, et al. (2008). "Glargine and protamine zinc insulin have a longer duration of action and result in lower mean daily glucose concentrations than lente insulin in healthy cats." J Vet Pharmacol Ther 31(3): 205-212.
>> PubMed Abstract

Rios, L. and C. Ward (2008). "Feline diabetes mellitus: diagnosis, treatment, and monitoring." Compend Contin Educ Vet 30(12): 626-39; quiz 639-40.
>> PubMed Abstract

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Feline Papillomavirus

Munday, J. S., L. Howe, et al. (2008). "Detection of papillomaviral DNA sequences in a feline oral squamous cell carcinoma." Res Vet Sci 86(2): 359-361.

Oral squamous cell carcinomas constitute 7.5% of all feline cancers, and often lead to death in affected cats. In humans, these tumors are associated with papillomavirus in about 25% of the cases. To investigate the association of papillomavirus with feline oral tumors, 40 oral lesions (20 cancerous, 20 non-cancerous) were examined for viral DNA. Papillomaviral DNA was detected in one oral tumor, but not in any non-cancerous lesion. Finding viral DNA in only one tumor did not indicate a causal relationship. The finding of viral DNA does however indicate additional research into the carcinogenic potential of these viruses in cats is warranted; the carcinogenic potential of papillomaviruses in general and the finding here of viral DNA in a feline oral tumor hints at a possible role. [MK]
>> PubMed Abstract

Related articles:
Munday, J. S., M. Kiupel, et al. (2007). "Detection of papillomaviral sequences in feline Bowenoid in situ carcinoma using consensus primers." Vet Dermatol 18(4): 241-5.
>> PubMed Abstract

Sundberg, J., M. Van Ranst, et al. (2000). "Feline papillomas and papillomaviruses." Vet Pathol 37(1): 1-10.
>> PubMed Abstact

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Munday, J. S., L. Howe, et al. (2008). "Detection of papillomaviral DNA sequences in a feline oral squamous cell carcinoma." Res Vet Sci 86(2): 359-361.

Oral squamous cell carcinomas constitute 7.5% of all feline cancers, and often lead to death in affected cats. In humans, these tumors are associated with papillomavirus in about 25% of the cases. To investigate the association of papillomavirus with feline oral tumors, 40 oral lesions (20 cancerous, 20 non-cancerous) were examined for viral DNA. Papillomaviral DNA was detected in one oral tumor, but not in any non-cancerous lesion. Finding viral DNA in only one tumor did not indicate a causal relationship. The finding of viral DNA does however indicate additional research into the carcinogenic potential of these viruses in cats is warranted; the carcinogenic potential of papillomaviruses in general and the finding here of viral DNA in a feline oral tumor hints at a possible role. [MK]
>> PubMed Abstract

Related articles:
Munday, J. S., M. Kiupel, et al. (2007). "Detection of papillomaviral sequences in feline Bowenoid in situ carcinoma using consensus primers." Vet Dermatol 18(4): 241-5.
>> PubMed Abstract

Sundberg, J., M. Van Ranst, et al. (2000). "Feline papillomas and papillomaviruses." Vet Pathol 37(1): 1-10.
>> PubMed Abstact

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Vitamin B12 Deficiency in Cats

Barron, P. M., J. T. Mackie, et al. (2009). "Serum cobalamin concentrations in healthy cats and cats with non-alimentary tract illness in Australia." Aust Vet J 87(7): 280-283.

The objective of this study was to determine a reference range for serum cobalamin (vitamin B12) concentration in healthy cats in Australia and prospectively investigate the prevalence of hypocobalaminemia in cats with non-alimentary tract disease. Blood samples were collected from 50 healthy cats and 47 cats with non-alimentary tract illness, and serum blood cobalamin concentrations were determined for each group. Cobalamin is a cofactor for several mammalian enzymatic reactions necessary for normal cellular function. Cats with low cobalamin levels have significant metabolic disturbances and clinical research into feline hypocobalaminemia has mostly involved cats with gastrointestinal disease. The reference range in the 50 clinically healthy cats was 345 to 3668 pb/mL. The median serum cobalamin concentration in the 47 cats with non-alimentary tract illness was not significantly different than the median concentration in the healthy cat group. The results indicate that hypocobalaminemia is uncommon in sick cats with non-alimentary tract illness in Australia, though its occurrence in this study still warrants further investigation. [VT]
>> PubMed Abstract

Related articles:
Ibarrola, P., L. Blackwood, et al. (2005). "Hypocobalaminaemia is uncommon in cats in the United Kingdom." J Fel Med Surg 7(6): 341-348.
>> PubMed Abstract

Ruaux, C., J. Steiner, et al. (2005). "Early biochemical and clinical responses to cobalamin supplementation in cats with signs of gastrointestinal disease and severe hypocobalaminemia." J Vet Intern Med 19(2): 155-160.
>> PubMed Abstract

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Barron, P. M., J. T. Mackie, et al. (2009). "Serum cobalamin concentrations in healthy cats and cats with non-alimentary tract illness in Australia." Aust Vet J 87(7): 280-283.

The objective of this study was to determine a reference range for serum cobalamin (vitamin B12) concentration in healthy cats in Australia and prospectively investigate the prevalence of hypocobalaminemia in cats with non-alimentary tract disease. Blood samples were collected from 50 healthy cats and 47 cats with non-alimentary tract illness, and serum blood cobalamin concentrations were determined for each group. Cobalamin is a cofactor for several mammalian enzymatic reactions necessary for normal cellular function. Cats with low cobalamin levels have significant metabolic disturbances and clinical research into feline hypocobalaminemia has mostly involved cats with gastrointestinal disease. The reference range in the 50 clinically healthy cats was 345 to 3668 pb/mL. The median serum cobalamin concentration in the 47 cats with non-alimentary tract illness was not significantly different than the median concentration in the healthy cat group. The results indicate that hypocobalaminemia is uncommon in sick cats with non-alimentary tract illness in Australia, though its occurrence in this study still warrants further investigation. [VT]
>> PubMed Abstract

Related articles:
Ibarrola, P., L. Blackwood, et al. (2005). "Hypocobalaminaemia is uncommon in cats in the United Kingdom." J Fel Med Surg 7(6): 341-348.
>> PubMed Abstract

Ruaux, C., J. Steiner, et al. (2005). "Early biochemical and clinical responses to cobalamin supplementation in cats with signs of gastrointestinal disease and severe hypocobalaminemia." J Vet Intern Med 19(2): 155-160.
>> PubMed Abstract

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