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Hyperpolarization-activated channels in trigeminal ganglia innervating healthy and pulp-exposed teeth.
Int Endod J. 2007 Sep; 40(9):715-21.IE

Abstract

AIM

To use immunocytochemistry for determining the expression of HCN1, HCN2 and HCN3 (three subunits of the hyperpolarization-activated cyclic nucleotide-gated current channel) in rodent trigeminal ganglia (TG) that innervate healthy teeth and determine if expression of HCN subunits is increased in TG following pulp exposure.

METHODOLOGY

Pulps were exposed in right maxillary incisors of male Sprague-Dawley rats. After fixation, TG were removed, cryostat sectioned, and immunocytochemistry was utilized to study the expression of HCN1-3 subunits. Immunoreactivity of individual neurons from the maxillary region of the TG was determined with ImageJ software. Differences in the number immunopositive neurons amongst groups were tested for statistical significance with either a Yates or Pearson's chi-square or Fisher's exact probability tests depending on neuron sample size. Differences in the intensity of immunoreactivity between groups were tested for statistical significance with a Student's t-test.

RESULTS

The majority of TG neurons were immunopositive for HCN1-3. Moreover, statistically significant increases in the number of TG neurons immunopositive for HCN1 and the intensity of HCN1-3 immunoreactivity were observed within hours of exposing the tooth pulp.

CONCLUSIONS

HCN1-3 expression, as determined by immunocytochemistry, is increased within hours after injury. Given that I(h) can facilitate neuronal excitability, results of the current study suggest that antagonists to HCN1-3 subunits could work as analgesics in the alleviation of orofacial pain.

Authors+Show Affiliations

School of Dental Medicine, Southern Illinois University, Alton, IL 62002, USA. jwells@siue.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17645513

Citation

Wells, J E., et al. "Hyperpolarization-activated Channels in Trigeminal Ganglia Innervating Healthy and Pulp-exposed Teeth." International Endodontic Journal, vol. 40, no. 9, 2007, pp. 715-21.
Wells JE, Rowland KC, Proctor EK. Hyperpolarization-activated channels in trigeminal ganglia innervating healthy and pulp-exposed teeth. Int Endod J. 2007;40(9):715-21.
Wells, J. E., Rowland, K. C., & Proctor, E. K. (2007). Hyperpolarization-activated channels in trigeminal ganglia innervating healthy and pulp-exposed teeth. International Endodontic Journal, 40(9), 715-21.
Wells JE, Rowland KC, Proctor EK. Hyperpolarization-activated Channels in Trigeminal Ganglia Innervating Healthy and Pulp-exposed Teeth. Int Endod J. 2007;40(9):715-21. PubMed PMID: 17645513.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Hyperpolarization-activated channels in trigeminal ganglia innervating healthy and pulp-exposed teeth. AU - Wells,J E, AU - Rowland,K C, AU - Proctor,E K, Y1 - 2007/07/23/ PY - 2007/7/25/pubmed PY - 2007/12/6/medline PY - 2007/7/25/entrez SP - 715 EP - 21 JF - International endodontic journal JO - Int Endod J VL - 40 IS - 9 N2 - AIM: To use immunocytochemistry for determining the expression of HCN1, HCN2 and HCN3 (three subunits of the hyperpolarization-activated cyclic nucleotide-gated current channel) in rodent trigeminal ganglia (TG) that innervate healthy teeth and determine if expression of HCN subunits is increased in TG following pulp exposure. METHODOLOGY: Pulps were exposed in right maxillary incisors of male Sprague-Dawley rats. After fixation, TG were removed, cryostat sectioned, and immunocytochemistry was utilized to study the expression of HCN1-3 subunits. Immunoreactivity of individual neurons from the maxillary region of the TG was determined with ImageJ software. Differences in the number immunopositive neurons amongst groups were tested for statistical significance with either a Yates or Pearson's chi-square or Fisher's exact probability tests depending on neuron sample size. Differences in the intensity of immunoreactivity between groups were tested for statistical significance with a Student's t-test. RESULTS: The majority of TG neurons were immunopositive for HCN1-3. Moreover, statistically significant increases in the number of TG neurons immunopositive for HCN1 and the intensity of HCN1-3 immunoreactivity were observed within hours of exposing the tooth pulp. CONCLUSIONS: HCN1-3 expression, as determined by immunocytochemistry, is increased within hours after injury. Given that I(h) can facilitate neuronal excitability, results of the current study suggest that antagonists to HCN1-3 subunits could work as analgesics in the alleviation of orofacial pain. SN - 0143-2885 UR - https://www.unboundmedicine.com/medline/citation/17645513/Hyperpolarization_activated_channels_in_trigeminal_ganglia_innervating_healthy_and_pulp_exposed_teeth_ L2 - https://doi.org/10.1111/j.1365-2591.2007.01297.x DB - PRIME DP - Unbound Medicine ER -