John A.  Ndon, Ph.D., MT (ASCP) 

Associate Professor 

Interests and Expertise
Immunity to malaria develops slowly. Our laboratory is looking at the mechanisms of actions of the several factors responsible for the slow acquisition of immunity to malaria. Hypoglycemia is an important manifestation of faciparum malaria. Little is known of the consequences of reported elevated plasma concentration of somatostatin in cerebral malaria. This hormone inhibits a broad range of endocrine functions including glucose metabolism. Our laboratory is involved in the study of hypothalamic regulation of impaired somatostatin secretion in cerebral malaria. Sulfadoxine/pyrimethamine (Fansidar) is widely used in Africa for treating chloroquine-resistant falciparum malaria. The efficacy of Fansidar in the treatment of uncomplicated falciparum malaria in Africa is increasingly compromised by development of resistance. Working with researchers at the University of Uyo and University of Calabar, we are correlating individual's genetic makeup to antimalarial drugs. In other words, in the future, by knowing your genetic constitution, your doctor will be able to tell you which medicines will be good and which will be innocous, and which will have undesirable side effects for you. The prevailing tenets of these investigations lie in the fact that we now know that genetic variations in the response to drugs can cause measurable differences in clinical endpoints such as rates of cure, morbidity, side effects, and death. Another focus is that genetic variation in drug targets can cause measurable differences in the response of an organism to a drug. Data in this category will document that the biological or physiological response to a drug varies, and that this variation can be associated with the variation of one or more genes. It is also known that genetic variation in processes involved in the absorption, distribution, metabolism, or elimination of a drug can result in changes in drug availability. Our investigations in this category are primarily concerned with demonstrating that genetic polymorphisms lead to variations in the levels or concentrations of drugs or their metabolites at the site of action. Finally it is documented that genetic variation can alter results of molecular and cellular functional assays, and this may correlate with variations in the organism's drug response. Data in this category demonstrate associations between genetic variation and laboratory assays of function at the molecular or cellular level. As the Director of NIH-Funded Bridges to the Future Program, we are developing partnerships with MATC to work towards eliminating racial and ethnic disparities in health. To solve the crisis of health disparities, we need to work collectively and think outside the box. We have many activities underway and more planned to help students at MATC enter research careers in the Biomedical Sciences.

Recent Publications
Crockett, Jimmy; Ndon JA; Sabin E, Jannetto P; Gock S, Jentzen JM, Wong SHY: Pharmacogenomics supplement with LC-MS drug assays as an adjunct in death certification of Amiltriptyline and Flouxetine fatalities. Society for Forensic Toxicologists.

Wong, S.H, P. J. Jannetto, E. Sahin, C.Schur, J. Crokeet, Ndon JA, R. Mucic, and M. Catania. DNA Electronic Microarray Detection for Pharmacogenomics - Genotyping CYP - 450 Mutations as Molecular Autopsy for Certifying Drug Related Toxicity. Society for Forensic Toxicologists. 33: 40; 2002

Wong, S.H, E. Sahin, P. J. Jannetto, M. A. Wagner, C.Schur, J. Crokeet, Ndon JA, R. Risinger, S.Gock and J. Jenzen. Pharmacogenomics as a Molecular Autopsy- Genotyping CYP450 2D ?3/? 4/?5 for Certifying Antidepressants and Selected Opiods related Toxicity. Society for Forensic Toxicologists. 33: 37-38; 2002

Ndon JA.: AIDS and Malaria in Africa: Presented at African and African American Workshop 2000. September 23, 2000. Milwaukee, Wisconsin.

Ndon JA., and Ekpo M. D. Incidence of Malaria in Asymptomatic HIV Infection. Proceedings: 24th World Congress of Medical Technology, June 19, 2000 in Vancouver, British Columbia, Canada

Ndon, JA., Udoh Sunde M. Effects of Malaria Infection During Pregnancy on Some Hematological Parameters. American Society for Clinical Laboratory Sciences for ASCLS Annual Meeting August 1998

Erica Sinclair and John Ndon: Diabetes Induced by Protease Inhibitor Treatment. Proceedings 24th Annual Third World Conference, Chicago 1998

Ndon, JA and Michelle L. Taylor. Health Consequences of Smoking in Third World Nations. Proceedings: 24th Annual Third World Conference Chicago 1998

Ajirotutu, CS; Ndon, JA, Agada J. Issues of Cultural Continuity with the African Child in the Diaspora. Proceedings of 23rd Annual Third World Conference March 19-22, 1997

Ndon,JA, Ajirotutu,CS; Agada J Emergence At-Risk Factors: Special Challenges for Populations within the African Diaspora. Proceedings of 23rd Annual Third World Conference March 19-22, 1997

Ndon, JA; Okorie HM; Udoh SM. Malaria Infection during Pregnancy: Hematological Proceedings of 23rd Annual Third World Conference March 19-22, 1997.

Ajiritutu, C., Ndon, JA., and J Agada: An Ecolological Analysis of At-Risk Factors that Globally Link West African and African American Children. Proceedings of 23 rd Annual Third World Conference P 1, 1997.

Ndon, JA., C. Ajiritutu and J Agada: Emerging at-risk Factors: Special Challenges for Populations within the African Diaspora. Proceedings of 23 rd Annual Third World Conference P 3, 1997

Ndon, JA., Udo, S.M.: Malaria Infection During Pregnancy: Hematological Parameters. Proceedings of 23 rd Annual Third World Conference P 5, 1997.

S.K.Fite, R.Brogan, Ndon,JA, A.Gustina and W.B.Wehrenberg: Immunocytochemical and mRNA analysis in glucocortocoid-treated rat model: Quantification of GH, GHRH and Somatoatatin. Endocrine Society, P545,1994.

Ndon, JA, C. Ajirotutu, Norge Jerome: Comparative analysis of West African and African-America Children At-Risk. Int. J. Child and Youth Care. 5:40.1994.

Ndon,JA, Iko Ibanga: Prevalence of HIV infection children in Nigeria. Int. J. Child and Youth Care. 5: 52. 1994

Ndon, J.A., Okorie, M.H., Uko, E.K., & Udo, S.M. (1995). Influence of Malaria in Pregnancy on some Hematological Parameters. Submitted to Clinical Laboratory Science.

Ndon, J.A., Udo, S.M., & Wehrenberg, W.B. (1992). Vibrio-Associated Gastroenteritis in the Lower Cross River Basin of Nigeria. Journal of Clinical Microbiology, 30: 2730-2732.

Ndon, J.A. (1992). Capnocytophaga Canimorsus Septicemia Caused by a Dog Bite in a Hairy Cell Leukemia Patient. Journal Of Clinical Microbiology, 30: 211-213.

Ndon, J., Giustina, A., & Wehrenberg, W.B. (1992). Hypothalamic Regulation of Impaired Growth Hormone Secretion in Diabetic Rats. Studies in Spontaneously Diabetic BB Worcester Rats. Neuroendocrine. 55: 506-511.

Ndon, J., Giustina, A., & Wehrenberg, W.B. (1992). Hypothalamic Regulation of Impaired Growth Hormone Secretion in Diabetic Rats. Studies in Streptozotocin-induced Diabetic Rats. Neuroendocrine. 55:500-505.

Speaker Topics 
AIDS in Africa
Health in Underdeveloped Countries

Education
Ph.D., Meharry Medical College, Microbiology, 1983