Pravin C. Singhal, MD

Investigator, The Feinstein Institute for Medical Research

Director, Academic Affairs, Division of Kidney Diseases and Hypertension

Professor of Medicine, Hofstra Northwell School of Medicine

Phone: (516) 465-3010
Email: psinghal@northwell.edu

About the Investigator

Dr. Pravin C. Singhal is director of the renal molecular research laboratory and academic affairs in the division of kidney diseases and hypertension at Northwell Health. He was appointed as chief of nephrology at Long Island Jewish Medical Center in 1994 and became chief of unified divisions of kidney diseases of North Shore University Hospital and Long Island Jewish Medical Center in 1999.

He also has been president of New York Society of Nephrology. He has more than 250 publications to his credit and has been an NIH investigator for the last 25 years.

Research Focus

Dr. Singhal’s main focus of the present research is to study the involved mechanism of the progression of renal lesions in patients with HIV-associated nephropathy. HIV-associated nephropathy (HIVAN) is an important complication of acquired immunodeficiency syndrome (AIDS). Its manifestation requires presence of specific ancestry (APOL1 gene), environmental (HIV infection) and host factors. Although significant research has been done to identify and to delineate the involved genes to correlate with the ancestry, there has been a limited effort to identify subversive activities of HIV, which might be contributing to specific host factors required for the display of unique phenotype of renal lesions in HIVAN.

Dr. Singhal hypothesizes that altered renal cell (RC) gene expression as a consequence of HIV-induced altered epigenetic chromatin modifications (through DNA methylation) may be contributing as specific host factors for the manifestation of kidney cell phenotypes displayed in HIVAN- collapsing variant of focal segmental glomerulosclerosis and microcystic dilatation of tubules. In preliminary studies, he found the HIV enhanced renal cell expression of Snail (a repressor of E-cadherin transcriptor, and a promoter of proliferative phenotype).

Since Snail, a gene regulator, has also been demonstrated to repress transcription of vitamin D receptor (VDR) and nephrin (a podocyte slit diaphragm protein), it carries a potential to alter podocyte phenotype. In our laboratory, he demonstrated that both glomerular and tubular epithelial cells in HIVAN mice displayed enhanced expression of Snail and diminished expression of VDR.

On the basis of these findings, he hypothesized that HIV-1 induced epigenetic factors (DNA methylation) may be contributing to the development of HIVAN phenotype through up regulation of Snail and down regulation of VDR and nephrin. Emerging data suggest that the majority of people of African-American descent are vitamin D (VD) deficient. VD works through cross-linking with its receptor, the VDR, and prevents its degradation. Therefore, patients with low serum VD levels are likely to be associated with compromised renal cell VDR expression. Currently, he is testing these hypotheses in his laboratory. If epigenetic factors are contributing to the development of HIVAN, we will develop therapeutic strategies to neutralize them.

Recently, in vivo studies have suggested that tubular cells may be serving as a reservoir for HIV-1. He is studying whether HIV-1 can infect tubular cells in vitro and may also serve as a potential reservoir. The mechanism by which HIV-1 enters these cells has not been identified. We observed that the C type lectin DEC-205 acts as a HIV-1 receptor in human kidney tubular (HK2) cells. Interaction of HIV-1 with DEC-205 results in internalization of the virus and establishment of a nonproductive infection. HIV-1-specific strong stop DNA is detected in the infected HK2 cells during the follow up period, and the virus can be rescued by co-cultivation with sensitive target cells. HIV-1 entry is blocked by pre-treatment with anti-DEC-205 specific antibody. Moreover, expression of DEC-205 in cells lacking the DEC-205 receptors renders them susceptible to HIV-1 infection. These findings suggest that DEC-205 acts as a HIV-1 receptor mediating internalization of the virus into renal tubular cells, from which the virus can be rescued and disseminated by encountering cells. Dr. Singhal intends to study the involved mechanism in interaction between DEC-205 and HIV-1.

In addition, he is also evaluating the effects of opiates and ethanol on T cell injury. T cell is an important immune cells. Opiate addicts and alcoholics are prone to infection. They also have low T cell count. Understanding the involved mechanism of low count in these populations will help him to develop therapeutic strategies to prevent it.

Lab Members

Ashwani Malhotra, PhD
Research Scientist
Email: amalhotra1@northwell.edu

Xiqian Lan, PhD
Institute Scientist
Emailxaln@northwell.edu

Vinod Kumar, PhD
Post Doc Research Trainee
Email: vkumar6@northwell.edu

Abheepsa Mishra, PhD
Post Doc Research Trainee
Email: amishra1@northwell.edu

Manoj Tembhre, PhD
Post Doc Research Trainee
Email: mtembhre@northwell.edu

Seyedeh Moshtahari
Research Assistant

Education

Postgraduate Institute of Medical Education and Research, Chandigarh, India
Degree: MD
1972
Field of Study: Medicine

Brigham and Women’s Hospital, Boston, MA
Degree: ABIM
1983
Field of Study: Internal Medicine

Albert Einstein College of Medicine, Bronx, NY
Degree: ABIM
1985
Field of Study: Nephrology

Awards & Honors

2016 Life time achievement award, Soc Neuroimmune Pharmacology
2014 ANIO Nephrology Award
2005 Chugh Oration Award
1995 Charak Award
1987 Fellowship, International Society of Nephrology
1985 Fellowship, New York Heart Association
1984 National Research Service Award
1982 Fellowship, Harvard University Boston
1978 International Research Award (Canada)

Publications
  1. Haque S, Lan X, Wen H, Lederman R, Chawla A, Attia M, Bongu RP, Husain M, Mikulak J, Saleem MA, Popik W, Malhotra A, Chander PN, Singhal PC. “HIV Promotes NLRP3 Inflammasome Complex Activation in Murine HIV-Associated Nephropathy.” Am J Pathol. 186:347-58, 2016. PMID:26683666
  2. Chandel N, Ayasolla KS, Lan X, Sultana-Syed M, Chawla A, Lederman R, Vethantham V, Saleem MA, Chander PN, Malhotra A, Singhal PC. “Epigenetic Modulation of Human Podocyte Vitamin D Receptor in HIV milieu.” J Mol Biol. 427:3201-15, 2015. PMID:26210663
  3. Singh T, Ayasolla K, Rai P, Chandel N, Haque S, Lederman R, Husain M, Vethantham V, Chawla A, Vashistha H, Saleem MA, Ding G, Chander PN, Malhotra A, Meggs LG, Singhal PC.  “AT1R blockade in adverse milieus: role of SMRT and corepressor complexes.” Am J Physiol Renal Physiol. 309:F189-203, 2015. PMID:26084932
  4. Chandel N, Husain M, Goel H, Salhan D, Lan X, Malhotra A, McGowan J, Singhal PC. “VDR hypermethylation and HIV-induced T cell loss.” J Leukoc Biol. 93:623-31, 2013. PMID:23390308
  5. Vashistha H, Singhal PC, Malhotra A, Husain M, Mathieson P, Saleem MA, Kuriakose C, Seshan S, Wilk A, Delvalle L, Peruzzi F, Giorgio M, Pelicci PG, Smithies O, Kim HS, Kakoki M, Reiss K, Meggs LG. “Null mutations at the p66 and bradykinin 2 receptor loci induce divergent phenotypes in the diabetic kidney.” Am J Physiol Renal Physiol. 303:F1629-40, 2012. PMID:23019230
  6. Husain M, Meggs LG, Vashistha H, Simoes S, Griffiths KO, Kumar D, Mikulak J, Mathieson PW, Saleem MA, Del Valle L, Pina-Oviedo S, Wang JY, Seshan SV, Malhotra A, Reiss K, Singhal PC. “Inhibition of p66ShcA longevity gene rescues podocytes from HIV-1-induced oxidative stress and apoptosis.” J Biol Chem. 284:16648-58, 2009. PMC2713565

View more at PubMed